diff --git a/src-tauri/src/commands/invoice.rs b/src-tauri/src/commands/invoice.rs
index b0fca67..fbe067a 100644
--- a/src-tauri/src/commands/invoice.rs
+++ b/src-tauri/src/commands/invoice.rs
@@ -3,8 +3,9 @@ use super::series::{validate_series_format, MAX_NUMBER_LEN};
 use super::settings::{map_bank, map_settings, SETTINGS_COLS};
 use crate::db::format_number;
 use crate::gst::{self, TaxType};
+use super::payments::{derive_summary, summary_for, today_ist};
 use crate::models::{
-    BankAccount, DraftSummary, Invoice, InvoiceInput, InvoiceItem, InvoiceSummary, Settings,
+    BankAccount, DraftSummary, Invoice, InvoiceInput, InvoiceItem, InvoiceSummary, PaymentSummary, Settings,
 };
 use crate::AppState;
 use chrono::NaiveDate;
@@ -59,6 +60,8 @@ fn map_invoice(row: &Row) -> rusqlite::Result<Invoice> {
         archived_fingerprint: row.get(35)?,
         archived_at: row.get(36)?,
         items: Vec::new(),
+        payment: PaymentSummary::default(),
+        total_paise: 0,
     })
 }
 
@@ -90,6 +93,8 @@ fn fetch_invoice(conn: &Connection, id: i64) -> rusqlite::Result<Invoice> {
         map_invoice,
     )?;
     invoice.items = fetch_items(conn, id)?;
+    invoice.total_paise = gst::rupees_to_paise(invoice.total);
+    invoice.payment = summary_for(conn, id, &invoice.status, invoice.total, &invoice.due_date)?;
     Ok(invoice)
 }
 
@@ -460,6 +465,12 @@ pub fn issue_invoice(
 
 /// Issued invoices are never deleted: cancelling keeps the row and its number.
 pub fn cancel_invoice_impl(conn: &mut Connection, id: i64, reason: &str) -> Result<Invoice, String> {
+    let payments: i64 = conn
+        .query_row("SELECT COUNT(*) FROM payments WHERE invoice_id = ?1", params![id], |r| r.get(0))
+        .map_err(|e| e.to_string())?;
+    if payments > 0 {
+        return Err("This invoice has payments recorded. Delete them before cancelling it.".into());
+    }
     let now = chrono::Utc::now().to_rfc3339();
     let changed = conn
         .execute(
@@ -491,23 +502,42 @@ pub fn cancel_invoice(state: State<AppState>, id: i64, reason: String) -> Result
 #[tauri::command]
 pub fn list_invoices(state: State<AppState>) -> Result<Vec<InvoiceSummary>, String> {
     let conn = state.db.lock().map_err(|e| e.to_string())?;
+    list_invoices_impl(&conn)
+}
+
+/// One query: invoices left-joined to their payment sums. Status derivation happens in Rust
+/// (`derive_summary`) so list and detail agree.
+pub fn list_invoices_impl(conn: &Connection) -> Result<Vec<InvoiceSummary>, String> {
+    let today = today_ist();
     let mut stmt = conn
         .prepare(
-            "SELECT id, number, invoice_date, due_date, client_name, total, status, created_at
-             FROM invoices ORDER BY id DESC",
+            "SELECT i.id, i.number, i.invoice_date, i.due_date, i.client_name, i.total, i.status,
+                    i.created_at, i.po_number, COALESCE(p.paid, 0), COALESCE(p.tds, 0)
+             FROM invoices i
+             LEFT JOIN (SELECT invoice_id, SUM(amount_paise) AS paid, SUM(tds_paise) AS tds
+                        FROM payments GROUP BY invoice_id) p ON p.invoice_id = i.id
+             ORDER BY i.id DESC",
         )
         .map_err(|e| e.to_string())?;
     let rows = stmt
         .query_map([], |row| {
+            let total: f64 = row.get(5)?;
+            let status: String = row.get(6)?;
+            let due_date: String = row.get(3)?;
+            let total_paise = gst::rupees_to_paise(total);
+            let payment = derive_summary(&status, total_paise, row.get(9)?, row.get(10)?, &due_date, &today);
             Ok(InvoiceSummary {
                 id: row.get(0)?,
                 number: row.get(1)?,
                 invoice_date: row.get(2)?,
-                due_date: row.get(3)?,
+                due_date,
                 client_name: row.get(4)?,
-                total: row.get(5)?,
-                status: row.get(6)?,
+                total,
+                status,
                 created_at: row.get(7)?,
+                po_number: row.get(8)?,
+                total_paise,
+                payment,
             })
         })
         .map_err(|e| e.to_string())?
@@ -516,10 +546,14 @@ pub fn list_invoices(state: State<AppState>) -> Result<Vec<InvoiceSummary>, Stri
     Ok(rows)
 }
 
+pub fn get_invoice_impl(conn: &Connection, id: i64) -> Result<Invoice, String> {
+    fetch_invoice(conn, id).map_err(|e| e.to_string())
+}
+
 #[tauri::command]
 pub fn get_invoice(state: State<AppState>, id: i64) -> Result<Invoice, String> {
     let conn = state.db.lock().map_err(|e| e.to_string())?;
-    fetch_invoice(&conn, id).map_err(|e| e.to_string())
+    get_invoice_impl(&conn, id)
 }
 
 pub fn save_draft_impl(
diff --git a/src-tauri/src/commands/mod.rs b/src-tauri/src/commands/mod.rs
index ad36bfe..dadeb8c 100644
--- a/src-tauri/src/commands/mod.rs
+++ b/src-tauri/src/commands/mod.rs
@@ -5,6 +5,7 @@ pub mod files;
 pub mod fonts;
 pub mod invoice;
 pub mod logo;
+pub mod payments;
 pub mod presets;
 pub mod raw;
 pub mod series;
diff --git a/src-tauri/src/commands/payments.rs b/src-tauri/src/commands/payments.rs
new file mode 100644
index 0000000..8f25404
--- /dev/null
+++ b/src-tauri/src/commands/payments.rs
@@ -0,0 +1,454 @@
+//! Payments received against issued invoices.
+//!
+//! Money is integer paise throughout. Payment status is never stored: it is derived from the
+//! payment rows, the invoice total and the due date, so deleting a payment reverts it for free.
+//! The issued invoice row is not touched by any of this.
+
+use crate::gst::rupees_to_paise;
+use crate::models::PaymentSummary;
+use crate::AppState;
+use chrono::{FixedOffset, NaiveDate, Utc};
+use rusqlite::{params, Connection, OptionalExtension};
+use serde::{Deserialize, Serialize};
+use tauri::State;
+
+const MODES: &[&str] = &["bank_transfer", "upi", "cash", "cheque", "other"];
+/// Upper bound on one payment (paise); keeps sums far from i64 overflow.
+const MAX_PAISE: i64 = 100_000_000_000;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Payment {
+    pub id: i64,
+    pub invoice_id: i64,
+    pub paid_on: String,
+    /// Cash received.
+    pub amount_paise: i64,
+    /// Tax deducted at source by the client; settles the invoice like cash does.
+    pub tds_paise: i64,
+    pub mode: String,
+    pub reference: String,
+    pub notes: String,
+    pub created_at: String,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PaymentInput {
+    pub invoice_id: i64,
+    pub paid_on: String,
+    pub amount_paise: i64,
+    #[serde(default)]
+    pub tds_paise: i64,
+    pub mode: String,
+    #[serde(default)]
+    pub reference: String,
+    #[serde(default)]
+    pub notes: String,
+}
+
+/// Today's date in India (IST, UTC+05:30), as YYYY-MM-DD. Due dates are plain calendar dates.
+pub fn today_ist() -> String {
+    let ist = FixedOffset::east_opt(5 * 3600 + 1800).expect("valid offset");
+    Utc::now().with_timezone(&ist).date_naive().format("%Y-%m-%d").to_string()
+}
+
+/// Derives the payment summary. Only an issued invoice takes payments; anything else is `none`
+/// with a zero balance (a cancelled invoice is owed nothing). `settled` is cash plus TDS.
+/// Overdue means a due date strictly before `today` while a balance remains; it wins over
+/// `partially_paid`, and the paid amounts still show the partial payment.
+pub fn derive_summary(
+    status: &str,
+    total_paise: i64,
+    paid_paise: i64,
+    tds_paise: i64,
+    due_date: &str,
+    today: &str,
+) -> PaymentSummary {
+    if status != "issued" {
+        return PaymentSummary {
+            paid_paise,
+            tds_paise,
+            balance_paise: 0,
+            payment_status: "none".to_string(),
+        };
+    }
+    let settled = paid_paise + tds_paise;
+    let balance = (total_paise - settled).max(0);
+    let overdue = balance > 0
+        && NaiveDate::parse_from_str(due_date.trim(), "%Y-%m-%d").is_ok()
+        && due_date.trim() < today;
+    let payment_status = if balance == 0 && total_paise > 0 {
+        "paid"
+    } else if overdue {
+        "overdue"
+    } else if settled > 0 {
+        "partially_paid"
+    } else {
+        "unpaid"
+    };
+    PaymentSummary {
+        paid_paise,
+        tds_paise,
+        balance_paise: balance,
+        payment_status: payment_status.to_string(),
+    }
+}
+
+/// Summary for one invoice read from the payments table.
+pub fn summary_for(
+    conn: &Connection,
+    invoice_id: i64,
+    status: &str,
+    total: f64,
+    due_date: &str,
+) -> rusqlite::Result<PaymentSummary> {
+    let (paid, tds): (i64, i64) = conn.query_row(
+        "SELECT COALESCE(SUM(amount_paise), 0), COALESCE(SUM(tds_paise), 0)
+         FROM payments WHERE invoice_id = ?1",
+        params![invoice_id],
+        |r| Ok((r.get(0)?, r.get(1)?)),
+    )?;
+    Ok(derive_summary(status, rupees_to_paise(total), paid, tds, due_date, &today_ist()))
+}
+
+fn rupees(paise: i64) -> String {
+    format!("₹{}.{:02}", paise / 100, paise % 100)
+}
+
+fn map_payment(r: &rusqlite::Row) -> rusqlite::Result<Payment> {
+    Ok(Payment {
+        id: r.get(0)?,
+        invoice_id: r.get(1)?,
+        paid_on: r.get(2)?,
+        amount_paise: r.get(3)?,
+        tds_paise: r.get(4)?,
+        mode: r.get(5)?,
+        reference: r.get(6)?,
+        notes: r.get(7)?,
+        created_at: r.get(8)?,
+    })
+}
+
+const COLS: &str = "id, invoice_id, paid_on, amount_paise, tds_paise, mode, reference, notes, created_at";
+
+pub fn record_payment_impl(conn: &mut Connection, input: PaymentInput) -> Result<Payment, String> {
+    let db = |e: rusqlite::Error| e.to_string();
+
+    NaiveDate::parse_from_str(input.paid_on.trim(), "%Y-%m-%d")
+        .map_err(|_| "Payment date must be a date like 2026-04-01".to_string())?;
+    if !MODES.contains(&input.mode.as_str()) {
+        return Err(format!("Unknown payment mode \"{}\"", input.mode));
+    }
+    if input.amount_paise < 0 || input.tds_paise < 0 {
+        return Err("Amounts cannot be negative".into());
+    }
+    if input.amount_paise > MAX_PAISE || input.tds_paise > MAX_PAISE {
+        return Err("That amount is too large".into());
+    }
+    if input.amount_paise + input.tds_paise == 0 {
+        return Err("Enter an amount received or TDS deducted".into());
+    }
+
+    let tx = conn.transaction().map_err(db)?;
+    let (status, total): (String, f64) = tx
+        .query_row(
+            "SELECT status, total FROM invoices WHERE id = ?1",
+            params![input.invoice_id],
+            |r| Ok((r.get(0)?, r.get(1)?)),
+        )
+        .optional()
+        .map_err(db)?
+        .ok_or_else(|| "Invoice not found".to_string())?;
+    if status != "issued" {
+        return Err(format!("Payments can only be recorded on an issued invoice (this one is {status})"));
+    }
+    let total_paise = rupees_to_paise(total);
+    let settled: i64 = tx
+        .query_row(
+            "SELECT COALESCE(SUM(amount_paise + tds_paise), 0) FROM payments WHERE invoice_id = ?1",
+            params![input.invoice_id],
+            |r| r.get(0),
+        )
+        .map_err(db)?;
+    let balance = total_paise - settled;
+    let incoming = input.amount_paise + input.tds_paise;
+    if incoming > balance {
+        return Err(format!(
+            "This payment of {} (cash plus TDS) is more than the outstanding balance of {}",
+            rupees(incoming),
+            rupees(balance.max(0))
+        ));
+    }
+
+    let now = chrono::Utc::now().to_rfc3339();
+    tx.execute(
+        "INSERT INTO payments (invoice_id, paid_on, amount_paise, tds_paise, mode, reference, notes, created_at)
+         VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
+        params![
+            input.invoice_id,
+            input.paid_on.trim(),
+            input.amount_paise,
+            input.tds_paise,
+            input.mode,
+            input.reference.trim(),
+            input.notes.trim(),
+            now
+        ],
+    )
+    .map_err(db)?;
+    let id = tx.last_insert_rowid();
+    let payment = tx
+        .query_row(&format!("SELECT {COLS} FROM payments WHERE id = ?1"), params![id], map_payment)
+        .map_err(db)?;
+    tx.commit().map_err(db)?;
+    Ok(payment)
+}
+
+pub fn list_payments_impl(conn: &Connection, invoice_id: i64) -> Result<Vec<Payment>, String> {
+    let mut stmt = conn
+        .prepare(&format!(
+            "SELECT {COLS} FROM payments WHERE invoice_id = ?1 ORDER BY paid_on ASC, id ASC"
+        ))
+        .map_err(|e| e.to_string())?;
+    let rows = stmt
+        .query_map(params![invoice_id], map_payment)
+        .map_err(|e| e.to_string())?
+        .collect::<rusqlite::Result<Vec<_>>>()
+        .map_err(|e| e.to_string())?;
+    Ok(rows)
+}
+
+pub fn delete_payment_impl(conn: &Connection, id: i64) -> Result<(), String> {
+    let changed = conn
+        .execute("DELETE FROM payments WHERE id = ?1", params![id])
+        .map_err(|e| e.to_string())?;
+    if changed == 0 {
+        return Err("Payment not found".into());
+    }
+    Ok(())
+}
+
+#[tauri::command]
+pub fn record_payment(state: State<AppState>, input: PaymentInput) -> Result<Payment, String> {
+    let mut conn = state.db.lock().map_err(|e| e.to_string())?;
+    record_payment_impl(&mut conn, input)
+}
+
+#[tauri::command]
+pub fn list_payments(state: State<AppState>, invoice_id: i64) -> Result<Vec<Payment>, String> {
+    let conn = state.db.lock().map_err(|e| e.to_string())?;
+    list_payments_impl(&conn, invoice_id)
+}
+
+#[tauri::command]
+pub fn delete_payment(state: State<AppState>, id: i64) -> Result<(), String> {
+    let conn = state.db.lock().map_err(|e| e.to_string())?;
+    delete_payment_impl(&conn, id)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::commands::invoice::{cancel_invoice_impl, issue_invoice_impl};
+    use crate::models::InvoiceInput;
+    use serde_json::json;
+    use std::path::Path;
+
+    /// An unregistered vendor issues without tax, so the invoice total is exactly the line amount.
+    fn issued(conn: &mut Connection, amount: f64, due: &str) -> i64 {
+        let input: InvoiceInput = serde_json::from_value(json!({
+            "invoiceDate": "2026-04-01",
+            "dueDate": due,
+            "clientName": "Client Ltd",
+            "taxType": "none",
+            "taxRate": 0.0,
+            "items": [{"description": "Design", "mode": "fixed", "amount": amount}],
+        }))
+        .unwrap();
+        issue_invoice_impl(conn, Path::new("/nonexistent"), input, &json!({})).unwrap().id
+    }
+
+    fn pay(invoice_id: i64, amount: i64, tds: i64) -> PaymentInput {
+        PaymentInput {
+            invoice_id,
+            paid_on: "2026-04-10".into(),
+            amount_paise: amount,
+            tds_paise: tds,
+            mode: "bank_transfer".into(),
+            reference: "UTR1".into(),
+            notes: String::new(),
+        }
+    }
+
+    fn summary(conn: &Connection, id: i64) -> PaymentSummary {
+        let (status, total, due): (String, f64, String) = conn
+            .query_row("SELECT status, total, due_date FROM invoices WHERE id = ?1", params![id], |r| {
+                Ok((r.get(0)?, r.get(1)?, r.get(2)?))
+            })
+            .unwrap();
+        summary_for(conn, id, &status, total, &due).unwrap()
+    }
+
+    #[test]
+    fn partial_then_full_payment_settles() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        assert_eq!(summary(&conn, id).payment_status, "unpaid");
+        assert_eq!(summary(&conn, id).balance_paise, 100_000);
+
+        record_payment_impl(&mut conn, pay(id, 40_000, 0)).unwrap();
+        let s = summary(&conn, id);
+        assert_eq!((s.payment_status.as_str(), s.paid_paise, s.balance_paise), ("partially_paid", 40_000, 60_000));
+
+        record_payment_impl(&mut conn, pay(id, 60_000, 0)).unwrap();
+        let s = summary(&conn, id);
+        assert_eq!((s.payment_status.as_str(), s.balance_paise), ("paid", 0));
+    }
+
+    #[test]
+    fn tds_counts_towards_settling() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        // 10% TDS: the client pays 900.00 in cash and deducts 100.00.
+        record_payment_impl(&mut conn, pay(id, 90_000, 10_000)).unwrap();
+        let s = summary(&conn, id);
+        assert_eq!((s.payment_status.as_str(), s.paid_paise, s.tds_paise, s.balance_paise), ("paid", 90_000, 10_000, 0));
+        // TDS alone is a valid payment too.
+        let id2 = issued(&mut conn, 500.0, "2999-01-01");
+        record_payment_impl(&mut conn, pay(id2, 0, 5_000)).unwrap();
+        assert_eq!(summary(&conn, id2).payment_status, "partially_paid");
+    }
+
+    #[test]
+    fn overpayment_is_rejected_including_tds() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        let err = record_payment_impl(&mut conn, pay(id, 100_001, 0)).unwrap_err();
+        assert!(err.contains("more than the outstanding balance of ₹1000.00"), "{err}");
+        // Cash plus TDS is what counts.
+        assert!(record_payment_impl(&mut conn, pay(id, 95_000, 6_000)).is_err());
+        record_payment_impl(&mut conn, pay(id, 50_000, 0)).unwrap();
+        let err = record_payment_impl(&mut conn, pay(id, 50_001, 0)).unwrap_err();
+        assert!(err.contains("₹500.00"), "{err}");
+        let n: i64 = conn.query_row("SELECT COUNT(*) FROM payments", [], |r| r.get(0)).unwrap();
+        assert_eq!(n, 1);
+    }
+
+    #[test]
+    fn invalid_input_is_rejected() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        assert!(record_payment_impl(&mut conn, pay(id, 0, 0)).is_err());
+        assert!(record_payment_impl(&mut conn, pay(id, -1, 0)).is_err());
+        assert!(record_payment_impl(&mut conn, pay(id, 100, -5)).is_err());
+        let mut bad = pay(id, 100, 0);
+        bad.mode = "barter".into();
+        assert!(record_payment_impl(&mut conn, bad).is_err());
+        let mut bad = pay(id, 100, 0);
+        bad.paid_on = "10/04/2026".into();
+        assert!(record_payment_impl(&mut conn, bad).is_err());
+        assert!(record_payment_impl(&mut conn, pay(9999, 100, 0)).is_err());
+        // The table CHECKs hold even if a caller bypasses the command validation.
+        assert!(conn
+            .execute(
+                "INSERT INTO payments (invoice_id, paid_on, amount_paise, tds_paise, mode, created_at)
+                 VALUES (?1, '2026-04-10', 0, 0, 'cash', 'now')",
+                params![id]
+            )
+            .is_err());
+    }
+
+    #[test]
+    fn draft_and_cancelled_invoices_take_no_payments() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        cancel_invoice_impl(&mut conn, id, "mistake").unwrap();
+        let err = record_payment_impl(&mut conn, pay(id, 100, 0)).unwrap_err();
+        assert!(err.contains("issued invoice"), "{err}");
+        let s = summary(&conn, id);
+        assert_eq!((s.payment_status.as_str(), s.balance_paise), ("none", 0));
+
+        let id2 = issued(&mut conn, 1000.0, "2999-01-01");
+        conn.execute("UPDATE invoices SET status = 'draft' WHERE id = ?1", params![id2]).unwrap();
+        assert!(record_payment_impl(&mut conn, pay(id2, 100, 0)).is_err());
+    }
+
+    #[test]
+    fn an_invoice_with_payments_cannot_be_cancelled() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        let p = record_payment_impl(&mut conn, pay(id, 100, 0)).unwrap();
+        let err = cancel_invoice_impl(&mut conn, id, "").unwrap_err();
+        assert!(err.contains("payments"), "{err}");
+        delete_payment_impl(&conn, p.id).unwrap();
+        cancel_invoice_impl(&mut conn, id, "").unwrap();
+    }
+
+    #[test]
+    fn deleting_a_payment_reverts_the_status() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let id = issued(&mut conn, 1000.0, "2999-01-01");
+        let full = record_payment_impl(&mut conn, pay(id, 100_000, 0)).unwrap();
+        assert_eq!(summary(&conn, id).payment_status, "paid");
+        delete_payment_impl(&conn, full.id).unwrap();
+        let s = summary(&conn, id);
+        assert_eq!((s.payment_status.as_str(), s.balance_paise), ("unpaid", 100_000));
+        assert!(list_payments_impl(&conn, id).unwrap().is_empty());
+        assert!(delete_payment_impl(&conn, full.id).is_err());
+    }
+
+    #[test]
+    fn overdue_is_derived_from_due_date_and_balance() {
+        let d = |due: &str, paid: i64, tds: i64| derive_summary("issued", 100_000, paid, tds, due, "2026-05-10");
+        // Due today is not overdue yet; the day after is.
+        assert_eq!(d("2026-05-10", 0, 0).payment_status, "unpaid");
+        assert_eq!(d("2026-05-09", 0, 0).payment_status, "overdue");
+        // Overdue wins over partially paid; the paid amount is still reported.
+        let s = d("2026-05-09", 10_000, 0);
+        assert_eq!((s.payment_status.as_str(), s.paid_paise), ("overdue", 10_000));
+        // A settled invoice is never overdue.
+        assert_eq!(d("2026-05-09", 90_000, 10_000).payment_status, "paid");
+        // No usable due date means never overdue.
+        assert_eq!(d("", 0, 0).payment_status, "unpaid");
+        assert_eq!(d("not a date", 0, 0).payment_status, "unpaid");
+        // Cancelled invoices are not owed.
+        assert_eq!(derive_summary("cancelled", 100_000, 0, 0, "2020-01-01", "2026-05-10").balance_paise, 0);
+    }
+
+    #[test]
+    fn totals_are_integer_paise_without_float_drift() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        // 0.1 + 0.2 style amounts: 3 x 33.33 = 99.99.
+        let id = issued(&mut conn, 99.99, "2999-01-01");
+        record_payment_impl(&mut conn, pay(id, 3333, 0)).unwrap();
+        record_payment_impl(&mut conn, pay(id, 3333, 0)).unwrap();
+        record_payment_impl(&mut conn, pay(id, 3333, 0)).unwrap();
+        let s = summary(&conn, id);
+        assert_eq!((s.paid_paise, s.balance_paise, s.payment_status.as_str()), (9999, 0, "paid"));
+        let inv = super::super::invoice::get_invoice_impl(&conn, id).unwrap();
+        assert_eq!(inv.total_paise, 9999);
+    }
+
+    #[test]
+    fn list_invoices_joins_the_payment_sums() {
+        let mut conn = crate::db::open_in_memory().unwrap();
+        let a = issued(&mut conn, 1000.0, "2020-01-01");
+        let b = issued(&mut conn, 200.0, "2999-01-01");
+        record_payment_impl(&mut conn, pay(a, 30_000, 5_000)).unwrap();
+        record_payment_impl(&mut conn, pay(a, 10_000, 0)).unwrap();
+        record_payment_impl(&mut conn, pay(b, 20_000, 0)).unwrap();
+        let rows = super::super::invoice::list_invoices_impl(&conn).unwrap();
+        let get = |id: i64| rows.iter().find(|r| r.id == id).unwrap();
+        let ra = get(a);
+        assert_eq!((ra.payment.paid_paise, ra.payment.tds_paise, ra.payment.balance_paise), (40_000, 5_000, 55_000));
+        assert_eq!(ra.payment.payment_status, "overdue");
+        assert_eq!(ra.total_paise, 100_000);
+        assert_eq!(get(b).payment.payment_status, "paid");
+        // The JSON keeps the existing fields and adds the flattened summary.
+        let json = serde_json::to_value(ra).unwrap();
+        assert_eq!(json["balancePaise"], 55_000);
+        assert_eq!(json["paymentStatus"], "overdue");
+        assert_eq!(json["total"], 1000.0);
+    }
+}
diff --git a/src-tauri/src/db.rs b/src-tauri/src/db.rs
index c460caf..9358ffb 100644
--- a/src-tauri/src/db.rs
+++ b/src-tauri/src/db.rs
@@ -10,7 +10,7 @@ const MAX_BACKUPS: usize = 10;
 const BACKUP_PREFIX: &str = "voiced-pre-v";
 
 /// Highest schema version, i.e. the number of entries in `migrations()`.
-const LATEST_VERSION: i64 = 7;
+const LATEST_VERSION: i64 = 8;
 
 #[derive(Debug, thiserror::Error)]
 pub enum DbError {
@@ -245,8 +245,36 @@ CREATE TABLE item_presets (
 );
 "#;
 
+/// Version 8: payments received against issued invoices. Amounts are integer paise. `amount_paise` is the cash
+/// received and `tds_paise` the tax the client deducted at source; both count towards settling the invoice.
+/// Payment status is derived from these rows and the due date, never stored, and the issued invoice row is untouched.
+const M8: &str = r#"
+CREATE TABLE payments (
+    id           INTEGER PRIMARY KEY AUTOINCREMENT,
+    invoice_id   INTEGER NOT NULL REFERENCES invoices(id),
+    paid_on      TEXT NOT NULL,
+    amount_paise INTEGER NOT NULL DEFAULT 0 CHECK (amount_paise >= 0),
+    tds_paise    INTEGER NOT NULL DEFAULT 0 CHECK (tds_paise >= 0),
+    mode         TEXT NOT NULL CHECK (mode IN ('bank_transfer', 'upi', 'cash', 'cheque', 'other')),
+    reference    TEXT NOT NULL DEFAULT '',
+    notes        TEXT NOT NULL DEFAULT '',
+    created_at   TEXT NOT NULL,
+    CHECK (amount_paise + tds_paise > 0)
+);
+CREATE INDEX idx_payments_invoice ON payments(invoice_id);
+"#;
+
 fn migrations() -> Migrations<'static> {
-    Migrations::new(vec![M::up(SCHEMA), M::up(M2), M::up(M3), M::up(M4), M::up(M5), M::up(M6), M::up(M7)])
+    Migrations::new(vec![
+        M::up(SCHEMA),
+        M::up(M2),
+        M::up(M3),
+        M::up(M4),
+        M::up(M5),
+        M::up(M6),
+        M::up(M7),
+        M::up(M8),
+    ])
 }
 
 /// Open (creating if needed) the database at `path` and bring it to the latest schema.
@@ -725,7 +753,7 @@ CREATE INDEX IF NOT EXISTS idx_invoices_created ON invoices(created_at DESC);
         .unwrap();
 
         migrations().to_latest(&mut conn).unwrap();
-        assert_eq!(user_version(&conn), 7);
+        assert_eq!(user_version(&conn), LATEST_VERSION);
 
         type Row = (String, String, String, String, String, String, String);
         let rows: Vec<Row> = conn
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 26f82b5..ea691d0 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -133,6 +133,9 @@ pub fn run() {
             commands::invoice::list_drafts,
             commands::invoice::get_draft,
             commands::invoice::delete_draft,
+            commands::payments::record_payment,
+            commands::payments::list_payments,
+            commands::payments::delete_payment,
             commands::assets::import_asset,
             commands::assets::save_asset_bytes,
             commands::assets::read_asset_data_uri,
diff --git a/src-tauri/src/models.rs b/src-tauri/src/models.rs
index a4ea66b..5c2dc9c 100644
--- a/src-tauri/src/models.rs
+++ b/src-tauri/src/models.rs
@@ -265,6 +265,34 @@ pub struct Invoice {
     pub archived_fingerprint: Option<String>,
     pub archived_at: Option<String>,
     pub items: Vec<InvoiceItem>,
+    /// Derived from the payments table (never stored on the invoice): see commands::payments.
+    #[serde(flatten)]
+    pub payment: PaymentSummary,
+    /// `total` in integer paise.
+    #[serde(default)]
+    pub total_paise: i64,
+}
+
+/// What has been received against an invoice. All amounts are integer paise; `payment_status` is
+/// unpaid | partially_paid | paid | overdue, or `none` for an invoice that takes no payments.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PaymentSummary {
+    pub paid_paise: i64,
+    pub tds_paise: i64,
+    pub balance_paise: i64,
+    pub payment_status: String,
+}
+
+impl Default for PaymentSummary {
+    fn default() -> Self {
+        PaymentSummary {
+            paid_paise: 0,
+            tds_paise: 0,
+            balance_paise: 0,
+            payment_status: "none".to_string(),
+        }
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -278,6 +306,10 @@ pub struct InvoiceSummary {
     pub total: f64,
     pub status: String,
     pub created_at: String,
+    pub po_number: String,
+    pub total_paise: i64,
+    #[serde(flatten)]
+    pub payment: PaymentSummary,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
diff --git a/src/App.tsx b/src/App.tsx
index 283b4e0..27ae6a5 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -6,6 +6,7 @@ import { AppShell, type AppView } from "./components/AppShell";
 import Onboarding from "./views/Onboarding";
 import NewInvoice from "./views/NewInvoice";
 import InvoiceHistory from "./views/InvoiceHistory";
+import InvoiceDetail from "./views/InvoiceDetail";
 import Clients from "./views/Clients";
 import { ToastProvider, useToast } from "./components/ToastProvider";
 import AppSettings from "./views/AppSettings";
@@ -24,6 +25,9 @@ function AppInner() {
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [view, setView] = useState<AppView>("new");
+  const [detailId, setDetailId] = useState<number | null>(null);
+  // A draft made by "Duplicate" that the New invoice form should open once it is shown.
+  const [openDraftId, setOpenDraftId] = useState<number | null>(null);
 
   const refreshSettings = useCallback(async () => {
     try {
@@ -104,10 +108,31 @@ function AppInner() {
           onSettingsChange={refreshSettings}
           active={view === "new"}
           onActivate={() => setView("new")}
+          openDraftId={openDraftId}
+          onDraftOpened={() => setOpenDraftId(null)}
         />
         <div hidden={view !== "invoices"}>
-          <InvoiceHistory settings={settings} active={view === "invoices"} />
+          <InvoiceHistory
+            settings={settings}
+            active={view === "invoices"}
+            onOpen={(id) => {
+              setDetailId(id);
+              setView("invoice");
+            }}
+          />
         </div>
+        {view === "invoice" && detailId !== null ? (
+          <InvoiceDetail
+            key={detailId}
+            invoiceId={detailId}
+            settings={settings}
+            onBack={() => setView("invoices")}
+            onDuplicated={(draftId) => {
+              setOpenDraftId(draftId);
+              setView("new");
+            }}
+          />
+        ) : null}
         <div hidden={view !== "clients"}>
           <Clients active={view === "clients"} />
         </div>
diff --git a/src/components/AppShell.tsx b/src/components/AppShell.tsx
index 0899c27..5b0a10b 100644
--- a/src/components/AppShell.tsx
+++ b/src/components/AppShell.tsx
@@ -11,9 +11,10 @@ import {
 import { Asleep, Light } from "@carbon/icons-react";
 import type { ReactNode } from "react";
 
-export type AppView = "new" | "invoices" | "clients" | "settings";
+/** "invoice" is the detail page of one invoice; it is reached from "invoices" and highlights that tab. */
+export type AppView = "new" | "invoices" | "invoice" | "clients" | "settings";
 
-const NAV: { id: AppView; label: string }[] = [
+const NAV: { id: Exclude<AppView, "invoice">; label: string }[] = [
   { id: "new", label: "New invoice" },
   { id: "invoices", label: "Invoices" },
   { id: "clients", label: "Clients" },
@@ -49,7 +50,7 @@ export function AppShell({ view, onNavigate, theme, onToggleTheme, children }: A
           {NAV.map((item) => (
             <HeaderMenuItem
               key={item.id}
-              isCurrentPage={view === item.id}
+              isCurrentPage={view === item.id || (view === "invoice" && item.id === "invoices")}
               onClick={(event) => {
                 event.preventDefault();
                 onNavigate(item.id);
diff --git a/src/components/RecordPaymentModal.tsx b/src/components/RecordPaymentModal.tsx
new file mode 100644
index 0000000..e14f80b
--- /dev/null
+++ b/src/components/RecordPaymentModal.tsx
@@ -0,0 +1,127 @@
+import { useEffect, useState } from "react";
+import { InlineNotification, Modal, Select, SelectItem, TextInput } from "@carbon/react";
+import { api } from "../lib/api";
+import { todayIst } from "../lib/fiscal";
+import { formatPaise, paiseToInput, parseRupeesToPaise } from "../lib/money";
+import { PAYMENT_MODES, type Payment, type PaymentMode } from "../lib/payments";
+import { useReturnFocus } from "../hooks/useReturnFocus";
+
+interface Props {
+  open: boolean;
+  invoiceId: number;
+  invoiceNumber: string;
+  /** What is still owed, in paise. */
+  balancePaise: number;
+  onClose: () => void;
+  onRecorded: (payment: Payment) => void;
+}
+
+/** "Record payment": cash received plus TDS deducted, validated against the balance before it is sent. */
+export default function RecordPaymentModal({ open, invoiceId, invoiceNumber, balancePaise, onClose, onRecorded }: Props) {
+  const [paidOn, setPaidOn] = useState(todayIst());
+  const [amount, setAmount] = useState("");
+  const [tds, setTds] = useState("");
+  const [mode, setMode] = useState<PaymentMode>("bank_transfer");
+  const [reference, setReference] = useState("");
+  const [notes, setNotes] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+  useReturnFocus(open);
+
+  // Each opening starts from the balance, so the common case (paid in full) is one click.
+  useEffect(() => {
+    if (!open) return;
+    setPaidOn(todayIst());
+    setAmount(paiseToInput(balancePaise));
+    setTds("");
+    setMode("bank_transfer");
+    setReference("");
+    setNotes("");
+    setError(null);
+    setBusy(false);
+  }, [open, balancePaise]);
+
+  const amountPaise = parseRupeesToPaise(amount);
+  const tdsPaise = parseRupeesToPaise(tds);
+  const amountInvalid = amountPaise === null;
+  const tdsInvalid = tdsPaise === null;
+  const total = (amountPaise ?? 0) + (tdsPaise ?? 0);
+  const overBalance = !amountInvalid && !tdsInvalid && total > balancePaise;
+  const empty = !amountInvalid && !tdsInvalid && total === 0;
+  const dateInvalid = !/^\d{4}-\d{2}-\d{2}$/.test(paidOn);
+  const canSubmit = !busy && !amountInvalid && !tdsInvalid && !overBalance && !empty && !dateInvalid;
+
+  const submit = async () => {
+    if (!canSubmit || amountPaise === null || tdsPaise === null) return;
+    setBusy(true);
+    setError(null);
+    try {
+      const payment = await api.recordPayment({ invoiceId, paidOn, amountPaise, tdsPaise, mode, reference, notes });
+      onRecorded(payment);
+    } catch (e) {
+      setError(String(e));
+      setBusy(false);
+    }
+  };
+
+  return (
+    <Modal
+      open={open}
+      modalHeading={`Record payment for ${invoiceNumber}`}
+      primaryButtonText={busy ? "Saving…" : "Record payment"}
+      secondaryButtonText="Cancel"
+      primaryButtonDisabled={!canSubmit}
+      onRequestClose={onClose}
+      onRequestSubmit={() => void submit()}
+    >
+      <div className="voiced-stack">
+        <p>
+          Balance due: <strong>{formatPaise(balancePaise)}</strong>
+        </p>
+        {error ? <InlineNotification kind="error" lowContrast hideCloseButton title="Could not record the payment" subtitle={error} /> : null}
+        <TextInput
+          id="payDate"
+          type="date"
+          labelText="Date received"
+          value={paidOn}
+          invalid={dateInvalid}
+          invalidText="Enter a date"
+          onChange={(e) => setPaidOn(e.target.value)}
+        />
+        <TextInput
+          id="payAmount"
+          inputMode="decimal"
+          labelText="Amount received (₹)"
+          helperText="Cash that reached your account"
+          value={amount}
+          invalid={amountInvalid || overBalance || empty}
+          invalidText={
+            amountInvalid
+              ? "Enter an amount like 1250.50"
+              : overBalance
+                ? `Amount plus TDS is more than the balance of ${formatPaise(balancePaise)}`
+                : "Enter an amount received or TDS deducted"
+          }
+          onChange={(e) => setAmount(e.target.value)}
+        />
+        <TextInput
+          id="payTds"
+          inputMode="decimal"
+          labelText="TDS deducted by client (₹)"
+          helperText="Counts towards settling the invoice; leave empty if none"
+          value={tds}
+          invalid={tdsInvalid}
+          invalidText="Enter an amount like 125.00"
+          onChange={(e) => setTds(e.target.value)}
+        />
+        <Select id="payMode" labelText="Mode" value={mode} onChange={(e) => setMode(e.target.value as PaymentMode)}>
+          {PAYMENT_MODES.map((m) => (
+            <SelectItem key={m.id} value={m.id} text={m.label} />
+          ))}
+        </Select>
+        <TextInput id="payRef" labelText="UTR / cheque number (optional)" value={reference} onChange={(e) => setReference(e.target.value)} />
+        <TextInput id="payNotes" labelText="Notes (optional)" value={notes} onChange={(e) => setNotes(e.target.value)} />
+      </div>
+    </Modal>
+  );
+}
diff --git a/src/hooks/useReturnFocus.ts b/src/hooks/useReturnFocus.ts
new file mode 100644
index 0000000..525c876
--- /dev/null
+++ b/src/hooks/useReturnFocus.ts
@@ -0,0 +1,21 @@
+import { useEffect, useRef } from "react";
+
+/**
+ * Gives focus back to whatever had it when a modal opened, once the modal closes. Carbon's Modal only
+ * does this with a launcher ref, which does not suit modals opened from table rows or menus.
+ */
+export function useReturnFocus(open: boolean): void {
+  const origin = useRef<HTMLElement | null>(null);
+  const wasOpen = useRef(false);
+  useEffect(() => {
+    if (open && !wasOpen.current) {
+      origin.current = document.activeElement instanceof HTMLElement ? document.activeElement : null;
+    } else if (!open && wasOpen.current) {
+      const el = origin.current;
+      origin.current = null;
+      // After the modal has unmounted its focus trap.
+      if (el && el.isConnected) setTimeout(() => el.focus(), 0);
+    }
+    wasOpen.current = open;
+  }, [open]);
+}
diff --git a/src/lib/api.ts b/src/lib/api.ts
index de62982..eb6421a 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -11,6 +11,7 @@ import type {
   Settings,
 } from "./types";
 import type { LogoAsset } from "./logo";
+import type { Payment, PaymentInput } from "./payments";
 import type { FontInspection, ImportMeta, RemoveOutcome, UserFontRow } from "./fontImport";
 
 export interface ArchiveStatus {
@@ -49,6 +50,10 @@ export const api = {
   listInvoices: () => invoke<InvoiceSummary[]>("list_invoices"),
   getInvoice: (id: number) => invoke<Invoice>("get_invoice", { id }),
 
+  recordPayment: (input: PaymentInput) => invoke<Payment>("record_payment", { input }),
+  listPayments: (invoiceId: number) => invoke<Payment[]>("list_payments", { invoiceId }),
+  deletePayment: (id: number) => invoke<void>("delete_payment", { id }),
+
   saveDraft: (id: number | null, payload: unknown) =>
     invoke<number>("save_draft", { id, payload }),
   listDrafts: () => invoke<DraftSummary[]>("list_drafts"),
diff --git a/src/lib/duplicate.test.ts b/src/lib/duplicate.test.ts
new file mode 100644
index 0000000..3690c28
--- /dev/null
+++ b/src/lib/duplicate.test.ts
@@ -0,0 +1,47 @@
+import { describe, expect, it } from "vitest";
+import { invoiceToFormState } from "./duplicate";
+import { fromDraftPayload, toDraftPayload } from "./draft";
+import type { Invoice } from "./types";
+
+const invoice = {
+  id: 7,
+  number: "AP/2025-007",
+  invoiceDate: "2025-04-01",
+  dueDate: "2025-05-01",
+  clientId: 3,
+  clientName: "Acme",
+  clientAddress: "1 Road",
+  clientGstin: "",
+  poNumber: "PO-1",
+  placeOfSupplyStateCode: "29",
+  discount: 50,
+  taxRate: 18,
+  reverseCharge: false,
+  bankAccountId: 2,
+  signaturePath: "assets/sig.png",
+  notes: "Thanks",
+  items: [
+    { id: 11, description: "Design", mode: "fixed", rate: 0, unit: "unit", quantity: 1, amount: 1000, sortOrder: 4, hsnSac: "998" },
+  ],
+} as unknown as Invoice;
+
+describe("invoiceToFormState", () => {
+  it("copies the content with a fresh date, due date and no item ids", () => {
+    const s = invoiceToFormState(invoice, { paymentTermsDays: 15 }, "2026-02-20");
+    expect(s.invoiceDate).toBe("2026-02-20");
+    expect(s.dueDate).toBe("2026-03-07");
+    expect(s.clientName).toBe("Acme");
+    expect(s.placeOfSupply).toBe("29");
+    expect(s.bankId).toBe(2);
+    expect(s.saveClient).toBe(false);
+    expect(s.items).toHaveLength(1);
+    expect(s.items[0]).not.toHaveProperty("id");
+    expect(s.items[0].sortOrder).toBe(0);
+    expect(s.items[0].hsnSac).toBe("998");
+  });
+
+  it("survives a round trip through the draft payload", () => {
+    const s = invoiceToFormState(invoice, { paymentTermsDays: 30 }, "2026-02-20");
+    expect(fromDraftPayload(toDraftPayload(s), s)).toEqual(s);
+  });
+});
diff --git a/src/lib/duplicate.ts b/src/lib/duplicate.ts
new file mode 100644
index 0000000..085617c
--- /dev/null
+++ b/src/lib/duplicate.ts
@@ -0,0 +1,32 @@
+import { addDays, todayIso } from "./format";
+import type { InvoiceFormState } from "./draft";
+import type { Invoice, Settings } from "./types";
+
+/**
+ * The New invoice form state for "Duplicate": every content field of the issued invoice, with today's date,
+ * a fresh due date, and no link to the original (no id, no number). The result goes through the normal draft
+ * mechanism (`toDraftPayload` + `saveDraft`), so the original stays immutable.
+ */
+export function invoiceToFormState(invoice: Invoice, settings: Pick<Settings, "paymentTermsDays">, today = todayIso()): InvoiceFormState {
+  return {
+    invoiceDate: today,
+    dueDate: addDays(today, settings.paymentTermsDays),
+    clientId: invoice.clientId,
+    clientName: invoice.clientName,
+    clientAddress: invoice.clientAddress,
+    clientGstin: invoice.clientGstin,
+    poNumber: invoice.poNumber,
+    placeOfSupply: invoice.placeOfSupplyStateCode,
+    saveClient: false,
+    items: invoice.items.map((item, index) => {
+      const { id: _id, ...rest } = item;
+      return { ...rest, sortOrder: index };
+    }),
+    discount: invoice.discount,
+    taxRate: invoice.taxRate,
+    reverseCharge: invoice.reverseCharge,
+    bankId: invoice.bankAccountId,
+    signaturePath: invoice.signaturePath,
+    notes: invoice.notes,
+  };
+}
diff --git a/src/lib/fiscal.test.ts b/src/lib/fiscal.test.ts
new file mode 100644
index 0000000..0de0422
--- /dev/null
+++ b/src/lib/fiscal.test.ts
@@ -0,0 +1,39 @@
+import { describe, expect, it } from "vitest";
+import { currentFyStartYear, fyLabel, fyRange, fyStartYear, monthOf, todayIst, FY_MONTHS } from "./fiscal";
+
+describe("financial year", () => {
+  it("starts on 1 April", () => {
+    expect(fyStartYear("2026-03-31")).toBe(2025);
+    expect(fyStartYear("2026-04-01")).toBe(2026);
+    expect(fyStartYear("2026-12-31")).toBe(2026);
+    expect(fyStartYear("2027-01-01")).toBe(2026);
+  });
+
+  it("rejects things that are not ISO dates", () => {
+    expect(fyStartYear("")).toBeNull();
+    expect(fyStartYear("01/04/2026")).toBeNull();
+    expect(fyStartYear("2026-13-01")).toBeNull();
+    expect(monthOf("2026-00-10")).toBeNull();
+    expect(monthOf("2026-07-10")).toBe(7);
+  });
+
+  it("labels and ranges", () => {
+    expect(fyLabel(2025)).toBe("FY 2025-26");
+    expect(fyLabel(2099)).toBe("FY 2099-00");
+    expect(fyRange(2025)).toEqual({ from: "2025-04-01", to: "2026-03-31" });
+  });
+
+  it("lists months April to March", () => {
+    expect(FY_MONTHS.map((m) => m.month)).toEqual([4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2, 3]);
+    expect(FY_MONTHS[0].label).toBe("April");
+  });
+
+  it("uses IST for now, not the machine time zone", () => {
+    // 20:00 UTC on 31 March is already 01:30 on 1 April in India: a new financial year.
+    const now = new Date("2026-03-31T20:00:00Z");
+    expect(todayIst(now)).toBe("2026-04-01");
+    expect(currentFyStartYear(now)).toBe(2026);
+    // 18:29 UTC is still 23:59 on 31 March in India.
+    expect(currentFyStartYear(new Date("2026-03-31T18:29:00Z"))).toBe(2025);
+  });
+});
diff --git a/src/lib/fiscal.ts b/src/lib/fiscal.ts
new file mode 100644
index 0000000..f80d7e6
--- /dev/null
+++ b/src/lib/fiscal.ts
@@ -0,0 +1,48 @@
+/** Indian financial year (April to March) helpers. Invoice dates are plain YYYY-MM-DD calendar dates, so they
+ * are read from the string; only "now" needs a time zone, and that is always IST (UTC+05:30). */
+
+const ISO = /^(\d{4})-(\d{2})-(\d{2})$/;
+const IST_OFFSET_MS = (5 * 60 + 30) * 60_000;
+
+/** Months in financial-year order, for the month filter. */
+export const FY_MONTHS: { month: number; label: string }[] = [4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2, 3].map((month) => ({
+  month,
+  label: new Date(2000, month - 1, 1).toLocaleDateString("en-GB", { month: "long" }),
+}));
+
+/** Month 1-12 of an ISO date, or null when it is not one. */
+export function monthOf(iso: string): number | null {
+  const m = ISO.exec(iso);
+  if (!m) return null;
+  const month = Number(m[2]);
+  return month >= 1 && month <= 12 ? month : null;
+}
+
+/** The calendar year in which the financial year containing `iso` starts (2026-03-31 -> 2025, 2026-04-01 -> 2026). */
+export function fyStartYear(iso: string): number | null {
+  const m = ISO.exec(iso);
+  const month = monthOf(iso);
+  if (!m || month === null) return null;
+  const year = Number(m[1]);
+  return month >= 4 ? year : year - 1;
+}
+
+/** 2025 -> "FY 2025-26". */
+export function fyLabel(startYear: number): string {
+  return `FY ${startYear}-${String((startYear + 1) % 100).padStart(2, "0")}`;
+}
+
+/** First and last day of a financial year. */
+export function fyRange(startYear: number): { from: string; to: string } {
+  return { from: `${startYear}-04-01`, to: `${startYear + 1}-03-31` };
+}
+
+/** Today's date in IST as YYYY-MM-DD. */
+export function todayIst(now: Date = new Date()): string {
+  return new Date(now.getTime() + IST_OFFSET_MS).toISOString().slice(0, 10);
+}
+
+/** The financial year that `now` falls in, in IST. */
+export function currentFyStartYear(now: Date = new Date()): number {
+  return fyStartYear(todayIst(now)) as number;
+}
diff --git a/src/lib/historyFilter.test.ts b/src/lib/historyFilter.test.ts
new file mode 100644
index 0000000..2e79a45
--- /dev/null
+++ b/src/lib/historyFilter.test.ts
@@ -0,0 +1,123 @@
+import { describe, expect, it } from "vitest";
+import { clientOptions, filterInvoices, fyOptions, fySummary, NO_FILTERS, sortInvoices, totalsOf } from "./historyFilter";
+import type { InvoiceSummary } from "./types";
+
+let nextId = 1;
+function row(over: Partial<InvoiceSummary>): InvoiceSummary {
+  const base: InvoiceSummary = {
+    id: nextId++,
+    number: "AP/2025-001",
+    invoiceDate: "2025-06-10",
+    dueDate: "2025-07-10",
+    clientName: "Acme",
+    total: 0,
+    status: "issued",
+    createdAt: "",
+    poNumber: "",
+    totalPaise: 100_000,
+    paidPaise: 0,
+    tdsPaise: 0,
+    balancePaise: 100_000,
+    paymentStatus: "unpaid",
+  };
+  return { ...base, ...over };
+}
+
+const rows: InvoiceSummary[] = [
+  row({ number: "AP/2025-001", invoiceDate: "2025-04-01", clientName: "Acme", poNumber: "PO-77", paymentStatus: "paid", paidPaise: 90_000, tdsPaise: 10_000, balancePaise: 0 }),
+  row({ number: "AP/2025-002", invoiceDate: "2025-05-20", clientName: "Beta Labs", totalPaise: 250_050, balancePaise: 250_050, paymentStatus: "overdue" }),
+  row({ number: "AP/2025-010", invoiceDate: "2026-03-31", clientName: "Acme", paidPaise: 30_000, balancePaise: 70_000, paymentStatus: "partially_paid" }),
+  row({ number: "AP/2026-001", invoiceDate: "2026-04-02", clientName: "Gamma", status: "cancelled", balancePaise: 0, paymentStatus: "none" }),
+  row({ number: "AP/2026-002", invoiceDate: "2026-04-05", clientName: "Acme", paymentStatus: "unpaid" }),
+];
+
+const f = (over: object) => filterInvoices(rows, { ...NO_FILTERS, ...over }).map((r) => r.number);
+
+describe("filterInvoices", () => {
+  it("returns everything with no filters", () => expect(f({})).toHaveLength(5));
+
+  it("searches number, client and PO case-insensitively", () => {
+    expect(f({ search: "beta" })).toEqual(["AP/2025-002"]);
+    expect(f({ search: "po-77" })).toEqual(["AP/2025-001"]);
+    expect(f({ search: " 2026-00 " })).toEqual(["AP/2026-001", "AP/2026-002"]);
+    expect(f({ search: "nothing" })).toEqual([]);
+  });
+
+  it("filters by status and payment status", () => {
+    expect(f({ status: "cancelled" })).toEqual(["AP/2026-001"]);
+    expect(f({ status: "issued" })).toHaveLength(4);
+    expect(f({ status: "paid" })).toEqual(["AP/2025-001"]);
+    expect(f({ status: "overdue" })).toEqual(["AP/2025-002"]);
+    expect(f({ status: "partially_paid" })).toEqual(["AP/2025-010"]);
+    // An overdue invoice with nothing received is also unpaid.
+    expect(f({ status: "unpaid" })).toEqual(["AP/2025-002", "AP/2026-002"]);
+  });
+
+  it("filters by financial year, month and client", () => {
+    expect(f({ fy: 2025 })).toEqual(["AP/2025-001", "AP/2025-002", "AP/2025-010"]);
+    expect(f({ fy: 2026 })).toEqual(["AP/2026-001", "AP/2026-002"]);
+    expect(f({ month: 4 })).toEqual(["AP/2025-001", "AP/2026-001", "AP/2026-002"]);
+    expect(f({ fy: 2026, month: 4 })).toEqual(["AP/2026-001", "AP/2026-002"]);
+    expect(f({ client: "Acme", fy: 2025 })).toEqual(["AP/2025-001", "AP/2025-010"]);
+  });
+});
+
+describe("sortInvoices", () => {
+  const nums = (sort: Parameters<typeof sortInvoices>[1]) => sortInvoices(rows, sort).map((r) => r.number);
+
+  it("sorts numbers naturally, so 010 follows 002", () => {
+    expect(nums({ key: "number", dir: "asc" }).slice(0, 3)).toEqual(["AP/2025-001", "AP/2025-002", "AP/2025-010"]);
+    expect(nums({ key: "number", dir: "desc" })[0]).toBe("AP/2026-002");
+  });
+
+  it("sorts by date, total and balance", () => {
+    expect(nums({ key: "date", dir: "desc" })[0]).toBe("AP/2026-002");
+    expect(nums({ key: "total", dir: "desc" })[0]).toBe("AP/2025-002");
+    expect(nums({ key: "balance", dir: "asc" }).slice(0, 2).sort()).toEqual(["AP/2025-001", "AP/2026-001"]);
+  });
+
+  it("sorts by status with overdue first and cancelled last, and does not mutate", () => {
+    const before = rows.map((r) => r.id);
+    const s = sortInvoices(rows, { key: "status", dir: "asc" });
+    expect(s[0].paymentStatus).toBe("overdue");
+    expect(s[s.length - 1].status).toBe("cancelled");
+    expect(rows.map((r) => r.id)).toEqual(before);
+  });
+
+  it("breaks ties by newest id", () => {
+    const tied = [row({ clientName: "Same" }), row({ clientName: "Same" })];
+    expect(sortInvoices(tied, { key: "client", dir: "asc" })[0].id).toBe(tied[1].id);
+  });
+});
+
+describe("totals", () => {
+  it("adds paise exactly and ignores cancelled invoices", () => {
+    const t = totalsOf(rows);
+    expect(t.count).toBe(5);
+    expect(t.invoicedPaise).toBe(100_000 + 250_050 + 100_000 + 100_000);
+    expect(t.receivedPaise).toBe(120_000);
+    expect(t.tdsPaise).toBe(10_000);
+    expect(t.outstandingPaise).toBe(250_050 + 70_000 + 100_000);
+  });
+
+  it("keeps cents exact where floats would drift", () => {
+    const many = Array.from({ length: 1000 }, () => row({ totalPaise: 10, balancePaise: 10 }));
+    expect(totalsOf(many).invoicedPaise).toBe(10_000);
+  });
+
+  it("summarises one financial year including overdue", () => {
+    const s = fySummary(rows, 2025);
+    expect(s.count).toBe(3);
+    expect(s.overdueCount).toBe(1);
+    expect(s.overduePaise).toBe(250_050);
+    expect(fySummary(rows, 2030).invoicedPaise).toBe(0);
+  });
+});
+
+describe("options", () => {
+  it("lists financial years newest first and always the current one", () => {
+    expect(fyOptions(rows, 2025)).toEqual([2026, 2025]);
+    expect(fyOptions([], 2027)).toEqual([2027]);
+  });
+  it("lists distinct clients", () => expect(clientOptions(rows)).toEqual(["Acme", "Beta Labs", "Gamma"]));
+});
diff --git a/src/lib/historyFilter.ts b/src/lib/historyFilter.ts
new file mode 100644
index 0000000..a8d7a6b
--- /dev/null
+++ b/src/lib/historyFilter.ts
@@ -0,0 +1,145 @@
+import { fyStartYear, monthOf } from "./fiscal";
+import type { InvoiceSummary } from "./types";
+
+export type StatusFilter = "all" | "issued" | "cancelled" | "unpaid" | "partially_paid" | "paid" | "overdue";
+
+export const STATUS_FILTERS: { id: StatusFilter; label: string }[] = [
+  { id: "all", label: "All statuses" },
+  { id: "issued", label: "Issued" },
+  { id: "unpaid", label: "Unpaid" },
+  { id: "partially_paid", label: "Partly paid" },
+  { id: "paid", label: "Paid" },
+  { id: "overdue", label: "Overdue" },
+  { id: "cancelled", label: "Cancelled" },
+];
+
+export interface HistoryFilters {
+  search: string;
+  status: StatusFilter;
+  /** Financial-year start year, or "all". */
+  fy: number | "all";
+  /** Calendar month 1-12, or "all". */
+  month: number | "all";
+  client: string | "all";
+}
+
+export const NO_FILTERS: HistoryFilters = { search: "", status: "all", fy: "all", month: "all", client: "all" };
+
+export type SortKey = "number" | "date" | "client" | "total" | "balance" | "status";
+export interface SortSpec {
+  key: SortKey;
+  dir: "asc" | "desc";
+}
+
+/** All amounts are integer paise. Cancelled invoices count for nothing. */
+export interface Totals {
+  count: number;
+  invoicedPaise: number;
+  receivedPaise: number;
+  tdsPaise: number;
+  outstandingPaise: number;
+}
+
+const settled = (r: InvoiceSummary) => r.paidPaise + r.tdsPaise;
+
+function matchesStatus(r: InvoiceSummary, f: StatusFilter): boolean {
+  switch (f) {
+    case "all":
+      return true;
+    case "issued":
+      return r.status === "issued";
+    case "cancelled":
+      return r.status === "cancelled";
+    case "unpaid":
+      return r.status === "issued" && settled(r) === 0;
+    case "partially_paid":
+      return r.status === "issued" && settled(r) > 0 && r.balancePaise > 0;
+    case "paid":
+      return r.status === "issued" && r.paymentStatus === "paid";
+    case "overdue":
+      return r.status === "issued" && r.paymentStatus === "overdue";
+  }
+}
+
+/** Rows that satisfy every filter. The search is a case-insensitive substring of number, client or PO number. */
+export function filterInvoices(rows: InvoiceSummary[], f: HistoryFilters): InvoiceSummary[] {
+  const q = f.search.trim().toLowerCase();
+  return rows.filter((r) => {
+    if (q && !`${r.number}\n${r.clientName}\n${r.poNumber}`.toLowerCase().includes(q)) return false;
+    if (!matchesStatus(r, f.status)) return false;
+    if (f.fy !== "all" && fyStartYear(r.invoiceDate) !== f.fy) return false;
+    if (f.month !== "all" && monthOf(r.invoiceDate) !== f.month) return false;
+    if (f.client !== "all" && r.clientName !== f.client) return false;
+    return true;
+  });
+}
+
+const STATUS_RANK: Record<string, number> = { overdue: 0, unpaid: 1, partially_paid: 2, paid: 3, none: 4 };
+const statusRank = (r: InvoiceSummary) => (r.status === "cancelled" ? 5 : (STATUS_RANK[r.paymentStatus] ?? 4));
+const numeric = new Intl.Collator("en", { numeric: true, sensitivity: "base" });
+
+function compare(a: InvoiceSummary, b: InvoiceSummary, key: SortKey): number {
+  switch (key) {
+    case "number":
+      return numeric.compare(a.number, b.number);
+    case "date":
+      return a.invoiceDate < b.invoiceDate ? -1 : a.invoiceDate > b.invoiceDate ? 1 : 0;
+    case "client":
+      return numeric.compare(a.clientName, b.clientName);
+    case "total":
+      return a.totalPaise - b.totalPaise;
+    case "balance":
+      return a.balancePaise - b.balancePaise;
+    case "status":
+      return statusRank(a) - statusRank(b);
+  }
+}
+
+/** A new, stably sorted array; ties fall back to the newest invoice first so the order never jitters. */
+export function sortInvoices(rows: InvoiceSummary[], sort: SortSpec): InvoiceSummary[] {
+  const sign = sort.dir === "asc" ? 1 : -1;
+  return [...rows].sort((a, b) => sign * compare(a, b, sort.key) || b.id - a.id);
+}
+
+export function totalsOf(rows: InvoiceSummary[]): Totals {
+  const t: Totals = { count: rows.length, invoicedPaise: 0, receivedPaise: 0, tdsPaise: 0, outstandingPaise: 0 };
+  for (const r of rows) {
+    if (r.status === "cancelled") continue;
+    t.invoicedPaise += r.totalPaise;
+    t.receivedPaise += r.paidPaise;
+    t.tdsPaise += r.tdsPaise;
+    t.outstandingPaise += r.balancePaise;
+  }
+  return t;
+}
+
+export interface FySummary extends Totals {
+  overdueCount: number;
+  overduePaise: number;
+}
+
+/** The tiles above the table: everything dated in one financial year, regardless of the other filters. */
+export function fySummary(rows: InvoiceSummary[], fy: number): FySummary {
+  const inYear = rows.filter((r) => fyStartYear(r.invoiceDate) === fy);
+  const overdue = inYear.filter((r) => r.status === "issued" && r.paymentStatus === "overdue");
+  return {
+    ...totalsOf(inYear),
+    overdueCount: overdue.length,
+    overduePaise: overdue.reduce((sum, r) => sum + r.balancePaise, 0),
+  };
+}
+
+/** Financial years that have invoices, newest first, always including `current`. */
+export function fyOptions(rows: InvoiceSummary[], current: number): number[] {
+  const years = new Set<number>([current]);
+  for (const r of rows) {
+    const y = fyStartYear(r.invoiceDate);
+    if (y !== null) years.add(y);
+  }
+  return [...years].sort((a, b) => b - a);
+}
+
+/** Distinct client names, alphabetical, blanks left out. */
+export function clientOptions(rows: InvoiceSummary[]): string[] {
+  return [...new Set(rows.map((r) => r.clientName.trim()).filter(Boolean))].sort((a, b) => numeric.compare(a, b));
+}
diff --git a/src/lib/money.test.ts b/src/lib/money.test.ts
new file mode 100644
index 0000000..444ea86
--- /dev/null
+++ b/src/lib/money.test.ts
@@ -0,0 +1,25 @@
+import { describe, expect, it } from "vitest";
+import { formatPaise, paiseToInput, parseRupeesToPaise } from "./money";
+
+describe("money", () => {
+  it("parses typed amounts to exact paise", () => {
+    expect(parseRupeesToPaise("1250.5")).toBe(125050);
+    expect(parseRupeesToPaise("1,25,000")).toBe(12500000);
+    expect(parseRupeesToPaise("₹ 99.99")).toBe(9999);
+    expect(parseRupeesToPaise("0.29")).toBe(29);
+    expect(parseRupeesToPaise("19.9")).toBe(1990);
+    expect(parseRupeesToPaise("5.")).toBe(500);
+    expect(parseRupeesToPaise("")).toBe(0);
+  });
+
+  it("rejects non-amounts", () => {
+    for (const bad of ["abc", "-5", "1.234", "1e3", "1.2.3", ".5"]) expect(parseRupeesToPaise(bad)).toBeNull();
+    expect(parseRupeesToPaise("99999999999999999999")).toBeNull();
+  });
+
+  it("formats", () => {
+    expect(paiseToInput(123450)).toBe("1234.50");
+    expect(paiseToInput(5)).toBe("0.05");
+    expect(formatPaise(12500000)).toBe("₹1,25,000.00");
+  });
+});
diff --git a/src/lib/money.ts b/src/lib/money.ts
new file mode 100644
index 0000000..3dab0f9
--- /dev/null
+++ b/src/lib/money.ts
@@ -0,0 +1,27 @@
+import { formatAmount } from "./format";
+
+/**
+ * Parses what a person types into an amount field ("1,25,000", "1250.5", "₹ 99.99") into integer paise
+ * without going through floating point. Returns null for anything that is not a plain amount with at
+ * most two decimals; an empty string is 0.
+ */
+export function parseRupeesToPaise(text: string): number | null {
+  const cleaned = text.replace(/[₹,\s]/g, "");
+  if (cleaned === "") return 0;
+  const m = /^(\d+)(?:\.(\d{0,2}))?$/.exec(cleaned);
+  if (!m) return null;
+  const whole = Number(m[1]);
+  const paise = whole * 100 + Number((m[2] ?? "").padEnd(2, "0"));
+  return Number.isSafeInteger(paise) ? paise : null;
+}
+
+/** 123450 -> "1234.50", for filling an amount field. */
+export function paiseToInput(paise: number): string {
+  const p = Math.max(0, Math.round(paise));
+  return `${Math.floor(p / 100)}.${String(p % 100).padStart(2, "0")}`;
+}
+
+/** 123450 -> "₹1,234.50" */
+export function formatPaise(paise: number): string {
+  return `₹${formatAmount(paise / 100)}`;
+}
diff --git a/src/lib/payments.ts b/src/lib/payments.ts
new file mode 100644
index 0000000..88aa82b
--- /dev/null
+++ b/src/lib/payments.ts
@@ -0,0 +1,46 @@
+import type { InvoiceStatus, PaymentStatus } from "./types";
+
+export type PaymentMode = "bank_transfer" | "upi" | "cash" | "cheque" | "other";
+
+export const PAYMENT_MODES: { id: PaymentMode; label: string }[] = [
+  { id: "bank_transfer", label: "Bank transfer" },
+  { id: "upi", label: "UPI" },
+  { id: "cash", label: "Cash" },
+  { id: "cheque", label: "Cheque" },
+  { id: "other", label: "Other" },
+];
+
+export const paymentModeLabel = (mode: string): string => PAYMENT_MODES.find((m) => m.id === mode)?.label ?? mode;
+
+/** A payment as stored: amounts are integer paise. `amountPaise` is cash; `tdsPaise` is tax the client deducted. */
+export interface Payment {
+  id: number;
+  invoiceId: number;
+  paidOn: string;
+  amountPaise: number;
+  tdsPaise: number;
+  mode: PaymentMode;
+  reference: string;
+  notes: string;
+  createdAt: string;
+}
+
+export type PaymentInput = Omit<Payment, "id" | "createdAt">;
+
+type TagType = "red" | "green" | "blue" | "gray" | "warm-gray" | "cool-gray" | "purple";
+
+/** What to show in the status column and badges: the cancelled state wins over payment state. */
+export function statusBadge(status: InvoiceStatus, payment: PaymentStatus | undefined): { label: string; type: TagType } {
+  if (status === "cancelled") return { label: "Cancelled", type: "gray" };
+  if (status === "draft") return { label: "Draft", type: "warm-gray" };
+  switch (payment) {
+    case "paid":
+      return { label: "Paid", type: "green" };
+    case "partially_paid":
+      return { label: "Partly paid", type: "blue" };
+    case "overdue":
+      return { label: "Overdue", type: "red" };
+    default:
+      return { label: "Unpaid", type: "cool-gray" };
+  }
+}
diff --git a/src/lib/types.ts b/src/lib/types.ts
index d20f060..fafdfe2 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -171,6 +171,9 @@ export interface InvoiceInput {
 
 export type InvoiceStatus = "draft" | "issued" | "cancelled";
 
+/** Derived by the backend from the payments and the due date; "none" for invoices that take no payments. */
+export type PaymentStatus = "none" | "unpaid" | "partially_paid" | "paid" | "overdue";
+
 /** An invoice as stored: all amounts are derived on the Rust side. */
 export interface Invoice {
   id: number;
@@ -214,6 +217,12 @@ export interface Invoice {
   archivedFingerprint?: string | null;
   archivedAt?: string | null;
   items: InvoiceItem[];
+  /** Payment summary added by the backend (integer paise). Optional so PDF fixtures built by hand need not carry it. */
+  totalPaise?: number;
+  paidPaise?: number;
+  tdsPaise?: number;
+  balancePaise?: number;
+  paymentStatus?: PaymentStatus;
 }
 
 export interface DraftSummary {
@@ -232,6 +241,12 @@ export interface InvoiceSummary {
   total: number;
   status: InvoiceStatus;
   createdAt: string;
+  poNumber: string;
+  totalPaise: number;
+  paidPaise: number;
+  tdsPaise: number;
+  balancePaise: number;
+  paymentStatus: PaymentStatus;
 }
 
 export const EMPTY_ITEM: InvoiceItem = {
diff --git a/src/styles/carbon.scss b/src/styles/carbon.scss
index ee0b26f..a363d32 100644
--- a/src/styles/carbon.scss
+++ b/src/styles/carbon.scss
@@ -540,3 +540,133 @@ body {
   margin-top: 0.5rem;
   font-size: 0.75rem;
 }
+
+/* ---------- Invoice history and detail ---------- */
+.voiced-num {
+  text-align: right;
+}
+
+.voiced-history__fy {
+  font-size: 1.25rem;
+  font-weight: 400;
+  margin-bottom: 0.5rem;
+}
+
+.voiced-history__tiles,
+.voiced-detail__tiles {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
+  gap: 1rem;
+  margin-bottom: 1.5rem;
+}
+
+.voiced-history__amount,
+.voiced-detail__amount {
+  font-size: 1.75rem;
+  font-weight: 400;
+}
+
+.voiced-history__tile--overdue {
+  border-left: 4px solid var(--cds-support-error);
+}
+
+.voiced-history__filters {
+  display: grid;
+  grid-template-columns: minmax(14rem, 2fr) repeat(4, minmax(9rem, 1fr)) auto;
+  gap: 1rem;
+  align-items: end;
+  margin-bottom: 1rem;
+}
+
+.voiced-history__row {
+  cursor: pointer;
+}
+
+.voiced-history__totals {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem 2rem;
+  padding: 0.75rem 1rem;
+  background: var(--cds-layer-accent);
+  border-top: 1px solid var(--cds-border-subtle);
+}
+
+.voiced-detail__head {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.75rem;
+  margin-top: 1rem;
+}
+
+.voiced-detail__actions {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.5rem;
+  margin: 1rem 0;
+}
+
+.voiced-detail__grid {
+  display: grid;
+  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
+  gap: 2rem;
+  align-items: start;
+}
+
+@media (max-width: 1100px) {
+  .voiced-detail__grid,
+  .voiced-history__filters {
+    grid-template-columns: 1fr;
+  }
+}
+
+.voiced-detail__h2 {
+  font-size: 1.25rem;
+  font-weight: 400;
+  margin-bottom: 0.75rem;
+}
+
+.voiced-detail__parties {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 2rem;
+}
+
+.voiced-detail__field {
+  margin-bottom: 0.75rem;
+}
+
+.voiced-detail__pre {
+  white-space: pre-line;
+}
+
+.voiced-detail__totals {
+  margin: 1rem 0 0.5rem auto;
+  max-width: 22rem;
+}
+
+.voiced-detail__totals > div {
+  display: flex;
+  justify-content: space-between;
+  padding: 0.25rem 0;
+}
+
+.voiced-detail__grand {
+  border-top: 1px solid var(--cds-border-strong);
+  font-weight: 600;
+}
+
+.voiced-detail__preview {
+  position: sticky;
+  top: 4rem;
+}
+
+.voiced-detail__unarchived {
+  padding: 1.5rem;
+  background: var(--cds-layer-accent);
+}
+
+.voiced-detail__unarchived p {
+  margin-bottom: 1rem;
+}
diff --git a/src/views/InvoiceDetail.tsx b/src/views/InvoiceDetail.tsx
new file mode 100644
index 0000000..0f3a7cb
--- /dev/null
+++ b/src/views/InvoiceDetail.tsx
@@ -0,0 +1,529 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import {
+  Button,
+  InlineLoading,
+  InlineNotification,
+  Modal,
+  OverflowMenu,
+  OverflowMenuItem,
+  Table,
+  TableBody,
+  TableCell,
+  TableContainer,
+  TableHead,
+  TableHeader,
+  TableRow,
+  Tag,
+  TextInput,
+  Tile,
+} from "@carbon/react";
+import { ArrowLeft, TrashCan } from "@carbon/icons-react";
+import { api, type ArchiveStatus } from "../lib/api";
+import { formatAmount, formatDate } from "../lib/format";
+import { formatPaise } from "../lib/money";
+import { paymentModeLabel, statusBadge, type Payment } from "../lib/payments";
+import { createExportDeps } from "../lib/exportDeps";
+import { renderAndArchive, type ExportSource } from "../lib/exportFlow";
+import { toDraftPayload } from "../lib/draft";
+import { invoiceToFormState } from "../lib/duplicate";
+import type { ExportMode } from "../lib/filename";
+import { useInvoiceExport } from "../hooks/useInvoiceExport";
+import { useReturnFocus } from "../hooks/useReturnFocus";
+import ExportFeedback from "../components/ExportFeedback";
+import PdfPreview from "../components/PdfPreview";
+import RecordPaymentModal from "../components/RecordPaymentModal";
+import { useToast } from "../components/ToastProvider";
+import { INDIAN_STATES, type Invoice, type Settings } from "../lib/types";
+
+interface Props {
+  invoiceId: number;
+  settings: Settings;
+  onBack: () => void;
+  /** A draft was created from this invoice; the shell opens it in the New invoice form. */
+  onDuplicated: (draftId: number) => void;
+}
+
+interface Frozen {
+  vendorName?: string;
+  vendorAddress?: string;
+  vendorGstin?: string;
+  vendorPan?: string;
+  vendorEmail?: string;
+  vendorPhone?: string;
+}
+
+function parseSnapshot(text: string): Frozen {
+  try {
+    return text ? (JSON.parse(text) as Frozen) : {};
+  } catch {
+    return {};
+  }
+}
+
+const stateName = (code: string) => {
+  const s = INDIAN_STATES.find((x) => x.code === code);
+  return s ? `${code} - ${s.name}` : code;
+};
+
+function Field({ label, children }: { label: string; children: React.ReactNode }) {
+  return (
+    <div className="voiced-detail__field">
+      <dt className="voiced-muted">{label}</dt>
+      <dd>{children || "—"}</dd>
+    </div>
+  );
+}
+
+export default function InvoiceDetail({ invoiceId, settings, onBack, onDuplicated }: Props) {
+  const toast = useToast();
+  const [invoice, setInvoice] = useState<Invoice | null>(null);
+  const [payments, setPayments] = useState<Payment[]>([]);
+  const [loadError, setLoadError] = useState<string | null>(null);
+  const [archive, setArchive] = useState<ArchiveStatus | null>(null);
+  const [pdf, setPdf] = useState<Uint8Array | null>(null);
+  const [pdfError, setPdfError] = useState<string | null>(null);
+  const [archiving, setArchiving] = useState(false);
+  const [recordOpen, setRecordOpen] = useState(false);
+  const [deleteTarget, setDeleteTarget] = useState<Payment | null>(null);
+  const [cancelOpen, setCancelOpen] = useState(false);
+  const [reason, setReason] = useState("");
+  const [duplicating, setDuplicating] = useState(false);
+  useReturnFocus(deleteTarget !== null);
+  useReturnFocus(cancelOpen);
+
+  // Guards against a slow load for a previous id landing after the id changed.
+  const generation = useRef(0);
+
+  const loadPdf = useCallback(async (id: number, gen: number) => {
+    setPdfError(null);
+    try {
+      const status = await api.archiveStatus(id);
+      if (gen !== generation.current) return;
+      setArchive(status);
+      if (status.archived) {
+        const bytes = await api.readArchive(id);
+        if (gen === generation.current) setPdf(bytes);
+      } else {
+        setPdf(null);
+      }
+    } catch (e) {
+      if (gen === generation.current) setPdfError(String(e));
+    }
+  }, []);
+
+  const loadData = useCallback(async (id: number, gen: number) => {
+    try {
+      const [inv, pays] = await Promise.all([api.getInvoice(id), api.listPayments(id)]);
+      if (gen !== generation.current) return;
+      setInvoice(inv);
+      setPayments(pays);
+      setLoadError(null);
+    } catch (e) {
+      if (gen === generation.current) setLoadError(String(e));
+    }
+  }, []);
+
+  useEffect(() => {
+    const gen = ++generation.current;
+    setInvoice(null);
+    setPdf(null);
+    setArchive(null);
+    void loadData(invoiceId, gen);
+    void loadPdf(invoiceId, gen);
+  }, [invoiceId, loadData, loadPdf]);
+
+  const refresh = () => loadData(invoiceId, generation.current);
+
+  const exp = useInvoiceExport({
+    settings,
+    bank: null,
+    // An export that had to archive the original first: show it in the preview.
+    onInvoiceUpdated: () => void loadPdf(invoiceId, generation.current),
+  });
+
+  const busy = exp.busy || archiving || duplicating;
+
+  const onExport = (mode: ExportMode, source: ExportSource) => {
+    if (!invoice) return;
+    void exp.start(invoice, mode, source).catch((e) => toast.error("Export failed", String(e)));
+  };
+
+  const onArchive = async () => {
+    if (!invoice) return;
+    setArchiving(true);
+    try {
+      const outcome = await renderAndArchive(invoice, createExportDeps({ settings, bank: null }));
+      if (outcome.archived) {
+        toast.success(`Invoice ${invoice.number} is archived`);
+        await Promise.all([loadPdf(invoiceId, generation.current), refresh()]);
+      } else {
+        toast.error("Could not archive the PDF", outcome.error ?? "The PDF could not be archived.");
+      }
+    } catch (e) {
+      toast.error("Could not archive the PDF", String(e));
+    } finally {
+      setArchiving(false);
+    }
+  };
+
+  const onDuplicate = async () => {
+    if (!invoice) return;
+    setDuplicating(true);
+    try {
+      const id = await api.saveDraft(null, toDraftPayload(invoiceToFormState(invoice, settings)));
+      toast.success("Draft created from this invoice", "Review it, then issue it as a new invoice.");
+      onDuplicated(id);
+    } catch (e) {
+      toast.error("Could not duplicate the invoice", String(e));
+    } finally {
+      setDuplicating(false);
+    }
+  };
+
+  const onCancelInvoice = async () => {
+    if (!invoice) return;
+    try {
+      await api.cancelInvoice(invoice.id, reason);
+      toast.success(`Invoice ${invoice.number} cancelled`);
+      setCancelOpen(false);
+      setReason("");
+      await refresh();
+    } catch (e) {
+      setCancelOpen(false);
+      toast.error("Could not cancel the invoice", String(e));
+    }
+  };
+
+  const onDeletePayment = async () => {
+    if (!deleteTarget) return;
+    const target = deleteTarget;
+    setDeleteTarget(null);
+    try {
+      await api.deletePayment(target.id);
+      toast.success("Payment deleted", `${formatPaise(target.amountPaise + target.tdsPaise)} on ${formatDate(target.paidOn)}`);
+      await refresh();
+    } catch (e) {
+      toast.error("Could not delete the payment", String(e));
+    }
+  };
+
+  if (loadError) {
+    return (
+      <div className="voiced-page">
+        <Button kind="ghost" size="sm" renderIcon={ArrowLeft} onClick={onBack}>
+          Back to invoices
+        </Button>
+        <InlineNotification kind="error" lowContrast hideCloseButton title="Could not load the invoice" subtitle={loadError} />
+      </div>
+    );
+  }
+  if (!invoice) {
+    return (
+      <div className="voiced-page">
+        <InlineLoading description="Loading invoice" />
+      </div>
+    );
+  }
+
+  const badge = statusBadge(invoice.status, invoice.paymentStatus);
+  const vendor = parseSnapshot(invoice.vendorSnapshot);
+  const total = invoice.totalPaise ?? Math.round(invoice.total * 100);
+  const balance = invoice.balancePaise ?? 0;
+  const canPay = invoice.status === "issued" && balance > 0;
+  const half = invoice.taxRate / 2;
+
+  return (
+    <div className="voiced-page voiced-detail">
+      <Button kind="ghost" size="sm" renderIcon={ArrowLeft} onClick={onBack}>
+        Back to invoices
+      </Button>
+
+      <div className="voiced-detail__head">
+        <h1 className="voiced-page__title">{invoice.number}</h1>
+        <Tag type={badge.type}>{badge.label}</Tag>
+        {invoice.status === "issued" && invoice.paymentStatus === "overdue" && (invoice.paidPaise ?? 0) + (invoice.tdsPaise ?? 0) > 0 ? (
+          <Tag type="blue" size="sm">
+            Partly paid
+          </Tag>
+        ) : null}
+        {archive && !archive.archived ? (
+          <Tag type="warm-gray" size="sm">
+            Not archived
+          </Tag>
+        ) : null}
+      </div>
+      <p className="voiced-page__subtitle">
+        {invoice.clientName || "No client name"} · issued {formatDate(invoice.invoiceDate)}
+        {invoice.dueDate ? ` · due ${formatDate(invoice.dueDate)}` : ""}
+      </p>
+
+      {invoice.status === "cancelled" ? (
+        <InlineNotification
+          kind="warning"
+          lowContrast
+          hideCloseButton
+          title="This invoice is cancelled"
+          subtitle={invoice.cancelReason ? `Reason: ${invoice.cancelReason}` : "Its number is not reused."}
+        />
+      ) : null}
+
+      <div className="voiced-detail__actions" role="toolbar" aria-label="Invoice actions">
+        {canPay ? (
+          <Button size="md" onClick={() => setRecordOpen(true)} disabled={busy}>
+            Record payment
+          </Button>
+        ) : null}
+        <Button kind="tertiary" size="md" onClick={() => onExport("searchable", "original")} disabled={busy}>
+          Export PDF
+        </Button>
+        <Button kind="tertiary" size="md" onClick={() => onExport("flattened", "original")} disabled={busy}>
+          Export flattened
+        </Button>
+        <Button kind="tertiary" size="md" onClick={() => void onDuplicate()} disabled={busy}>
+          {duplicating ? "Duplicating…" : "Duplicate"}
+        </Button>
+        <OverflowMenu aria-label="More actions" iconDescription="More actions" flipped size="md" disabled={busy}>
+          <OverflowMenuItem itemText="Re-render with current template" onClick={() => onExport("searchable", "rerender")} />
+          {invoice.status === "issued" ? (
+            <OverflowMenuItem
+              itemText={payments.length > 0 ? "Cancel invoice (delete payments first)" : "Cancel invoice"}
+              hasDivider
+              isDelete
+              disabled={payments.length > 0}
+              onClick={() => {
+                setReason("");
+                setCancelOpen(true);
+              }}
+            />
+          ) : null}
+        </OverflowMenu>
+      </div>
+
+      <ExportFeedback exp={exp} />
+
+      <div className="voiced-detail__grid">
+        <div className="voiced-detail__main voiced-stack">
+          <div className="voiced-detail__tiles">
+            <Tile>
+              <p className="voiced-muted">Total</p>
+              <p className="voiced-detail__amount">{formatPaise(total)}</p>
+            </Tile>
+            <Tile>
+              <p className="voiced-muted">Received</p>
+              <p className="voiced-detail__amount">{formatPaise(invoice.paidPaise ?? 0)}</p>
+            </Tile>
+            <Tile>
+              <p className="voiced-muted">TDS deducted</p>
+              <p className="voiced-detail__amount">{formatPaise(invoice.tdsPaise ?? 0)}</p>
+            </Tile>
+            <Tile>
+              <p className="voiced-muted">Balance</p>
+              <p className="voiced-detail__amount">{formatPaise(balance)}</p>
+            </Tile>
+          </div>
+
+          <section aria-labelledby="detail-parties">
+            <h2 id="detail-parties" className="voiced-detail__h2">
+              Parties
+            </h2>
+            <div className="voiced-detail__parties">
+              <dl>
+                <Field label="Billed to">{invoice.clientName}</Field>
+                <Field label="Address">
+                  <span className="voiced-detail__pre">{invoice.clientAddress}</span>
+                </Field>
+                <Field label="GSTIN">{invoice.clientGstin}</Field>
+                <Field label="PO number">{invoice.poNumber}</Field>
+                <Field label="Place of supply">{invoice.placeOfSupplyStateCode ? stateName(invoice.placeOfSupplyStateCode) : ""}</Field>
+              </dl>
+              <dl>
+                <Field label="Issued by">{vendor.vendorName}</Field>
+                <Field label="Address">
+                  <span className="voiced-detail__pre">{vendor.vendorAddress}</span>
+                </Field>
+                <Field label="GSTIN">{vendor.vendorGstin}</Field>
+                <Field label="PAN">{vendor.vendorPan}</Field>
+              </dl>
+            </div>
+          </section>
+
+          <section aria-labelledby="detail-items">
+            <h2 id="detail-items" className="voiced-detail__h2">
+              Items
+            </h2>
+            <TableContainer>
+              <Table aria-label="Invoice items" size="sm">
+                <TableHead>
+                  <TableRow>
+                    <TableHeader>Description</TableHeader>
+                    <TableHeader>HSN/SAC</TableHeader>
+                    <TableHeader className="voiced-num">Amount</TableHeader>
+                  </TableRow>
+                </TableHead>
+                <TableBody>
+                  {invoice.items.map((item, i) => (
+                    <TableRow key={item.id ?? i}>
+                      <TableCell>
+                        <span className="voiced-detail__pre">{item.description}</span>
+                        {item.mode === "rate" ? (
+                          <div className="voiced-muted">
+                            {item.quantity} {item.unit} × ₹{formatAmount(item.rate)}
+                          </div>
+                        ) : null}
+                      </TableCell>
+                      <TableCell>{item.hsnSac || "—"}</TableCell>
+                      <TableCell className="voiced-num">₹{formatAmount(item.amount)}</TableCell>
+                    </TableRow>
+                  ))}
+                </TableBody>
+              </Table>
+            </TableContainer>
+            <dl className="voiced-detail__totals">
+              <div>
+                <dt>Subtotal</dt>
+                <dd>₹{formatAmount(invoice.subtotal)}</dd>
+              </div>
+              {invoice.discount > 0 ? (
+                <div>
+                  <dt>Discount</dt>
+                  <dd>−₹{formatAmount(invoice.discount)}</dd>
+                </div>
+              ) : null}
+              {invoice.taxType === "cgst_sgst" ? (
+                <>
+                  <div>
+                    <dt>CGST @ {half}%</dt>
+                    <dd>₹{formatAmount(invoice.cgstAmount)}</dd>
+                  </div>
+                  <div>
+                    <dt>SGST @ {half}%</dt>
+                    <dd>₹{formatAmount(invoice.sgstAmount)}</dd>
+                  </div>
+                </>
+              ) : null}
+              {invoice.taxType === "igst" ? (
+                <div>
+                  <dt>IGST @ {invoice.taxRate}%</dt>
+                  <dd>₹{formatAmount(invoice.igstAmount)}</dd>
+                </div>
+              ) : null}
+              <div className="voiced-detail__grand">
+                <dt>Total</dt>
+                <dd>₹{formatAmount(invoice.total)}</dd>
+              </div>
+            </dl>
+            {invoice.amountInWords ? <p className="voiced-muted">{invoice.amountInWords}</p> : null}
+            {invoice.notes ? <p className="voiced-detail__pre voiced-muted">{invoice.notes}</p> : null}
+          </section>
+
+          <section aria-labelledby="detail-payments">
+            <h2 id="detail-payments" className="voiced-detail__h2">
+              Payments
+            </h2>
+            {payments.length === 0 ? (
+              <p className="voiced-muted">No payments recorded.</p>
+            ) : (
+              <TableContainer>
+                <Table aria-label="Payments" size="sm">
+                  <TableHead>
+                    <TableRow>
+                      <TableHeader>Date</TableHeader>
+                      <TableHeader>Mode</TableHeader>
+                      <TableHeader>Reference</TableHeader>
+                      <TableHeader className="voiced-num">Received</TableHeader>
+                      <TableHeader className="voiced-num">TDS</TableHeader>
+                      <TableHeader>
+                        <span className="cds--assistive-text">Actions</span>
+                      </TableHeader>
+                    </TableRow>
+                  </TableHead>
+                  <TableBody>
+                    {payments.map((p) => (
+                      <TableRow key={p.id}>
+                        <TableCell>{formatDate(p.paidOn)}</TableCell>
+                        <TableCell>{paymentModeLabel(p.mode)}</TableCell>
+                        <TableCell>
+                          {p.reference || "—"}
+                          {p.notes ? <div className="voiced-muted">{p.notes}</div> : null}
+                        </TableCell>
+                        <TableCell className="voiced-num">{formatPaise(p.amountPaise)}</TableCell>
+                        <TableCell className="voiced-num">{formatPaise(p.tdsPaise)}</TableCell>
+                        <TableCell>
+                          <Button
+                            kind="ghost"
+                            size="sm"
+                            hasIconOnly
+                            renderIcon={TrashCan}
+                            iconDescription={`Delete payment of ${formatPaise(p.amountPaise + p.tdsPaise)} on ${formatDate(p.paidOn)}`}
+                            tooltipPosition="left"
+                            onClick={() => setDeleteTarget(p)}
+                          />
+                        </TableCell>
+                      </TableRow>
+                    ))}
+                  </TableBody>
+                </Table>
+              </TableContainer>
+            )}
+          </section>
+        </div>
+
+        <aside className="voiced-detail__preview" aria-label="Archived PDF">
+          <h2 className="voiced-detail__h2">PDF as issued</h2>
+          {archive && !archive.archived ? (
+            <div className="voiced-detail__unarchived">
+              <p>Issued – not archived. The original PDF was never saved, so there is nothing to preview yet.</p>
+              <Button kind="primary" size="sm" onClick={() => void onArchive()} disabled={busy}>
+                {archiving ? "Working…" : "Render & archive"}
+              </Button>
+            </div>
+          ) : (
+            <PdfPreview bytes={pdf} pages={0} issues={[]} rendering={archive === null && !pdfError} mode="worker" error={pdfError} />
+          )}
+        </aside>
+      </div>
+
+      <RecordPaymentModal
+        open={recordOpen}
+        invoiceId={invoice.id}
+        invoiceNumber={invoice.number}
+        balancePaise={balance}
+        onClose={() => setRecordOpen(false)}
+        onRecorded={(p) => {
+          setRecordOpen(false);
+          toast.success("Payment recorded", `${formatPaise(p.amountPaise + p.tdsPaise)} on ${formatDate(p.paidOn)}`);
+          void refresh();
+        }}
+      />
+
+      <Modal
+        open={deleteTarget !== null}
+        danger
+        modalHeading="Delete this payment?"
+        primaryButtonText="Delete payment"
+        secondaryButtonText="Keep payment"
+        onRequestClose={() => setDeleteTarget(null)}
+        onRequestSubmit={() => void onDeletePayment()}
+      >
+        <p>
+          {deleteTarget
+            ? `${formatPaise(deleteTarget.amountPaise + deleteTarget.tdsPaise)} (cash ${formatPaise(deleteTarget.amountPaise)}, TDS ${formatPaise(deleteTarget.tdsPaise)}) received on ${formatDate(deleteTarget.paidOn)}. The invoice balance goes back up by that amount.`
+            : ""}
+        </p>
+      </Modal>
+
+      <Modal
+        open={cancelOpen}
+        danger
+        modalHeading={`Cancel invoice ${invoice.number}?`}
+        primaryButtonText="Cancel invoice"
+        secondaryButtonText="Keep invoice"
+        onRequestClose={() => setCancelOpen(false)}
+        onRequestSubmit={() => void onCancelInvoice()}
+      >
+        <p style={{ marginBottom: "1rem" }}>The invoice stays in the list as cancelled and its number is not reused.</p>
+        <TextInput id="detailCancelReason" labelText="Reason (optional)" value={reason} onChange={(e) => setReason(e.target.value)} />
+      </Modal>
+    </div>
+  );
+}
diff --git a/src/views/InvoiceHistory.tsx b/src/views/InvoiceHistory.tsx
index a00d95b..0fc7175 100644
--- a/src/views/InvoiceHistory.tsx
+++ b/src/views/InvoiceHistory.tsx
@@ -1,10 +1,14 @@
-import { useEffect, useState } from "react";
+import { useEffect, useMemo, useState } from "react";
 import {
   Button,
   InlineLoading,
-  Modal,
+  Link,
   OverflowMenu,
   OverflowMenuItem,
+  Pagination,
+  Search,
+  Select,
+  SelectItem,
   Table,
   TableBody,
   TableCell,
@@ -13,32 +17,62 @@ import {
   TableHeader,
   TableRow,
   Tag,
-  TextInput,
+  Tile,
 } from "@carbon/react";
 import { api } from "../lib/api";
-import { formatAmount, formatDate } from "../lib/format";
-import { createExportDeps } from "../lib/exportDeps";
-import { renderAndArchive, type ExportSource } from "../lib/exportFlow";
+import { formatDate } from "../lib/format";
+import { formatPaise } from "../lib/money";
+import { statusBadge } from "../lib/payments";
+import { currentFyStartYear, FY_MONTHS, fyLabel } from "../lib/fiscal";
+import {
+  clientOptions,
+  filterInvoices,
+  fyOptions,
+  fySummary,
+  NO_FILTERS,
+  sortInvoices,
+  STATUS_FILTERS,
+  totalsOf,
+  type HistoryFilters,
+  type SortKey,
+  type SortSpec,
+  type StatusFilter,
+} from "../lib/historyFilter";
 import type { ExportMode } from "../lib/filename";
+import type { ExportSource } from "../lib/exportFlow";
 import { useInvoiceExport } from "../hooks/useInvoiceExport";
 import ExportFeedback from "../components/ExportFeedback";
-import type { InvoiceSummary, Settings } from "../lib/types";
 import { useToast } from "../components/ToastProvider";
+import type { InvoiceSummary, Settings } from "../lib/types";
 
-export default function InvoiceHistory({ settings, active }: { settings: Settings; active: boolean }) {
+interface Props {
+  settings: Settings;
+  active: boolean;
+  /** Opens the detail page of an invoice. */
+  onOpen: (id: number) => void;
+}
+
+const PAGE_SIZES = [25, 50, 100];
+
+const COLUMNS: { key: SortKey; label: string; numeric?: boolean }[] = [
+  { key: "number", label: "Number" },
+  { key: "date", label: "Date" },
+  { key: "client", label: "Client" },
+  { key: "total", label: "Total", numeric: true },
+  { key: "balance", label: "Balance", numeric: true },
+  { key: "status", label: "Status" },
+];
+
+export default function InvoiceHistory({ settings, active, onOpen }: Props) {
   const toast = useToast();
   const [rows, setRows] = useState<InvoiceSummary[]>([]);
   const [loading, setLoading] = useState(true);
   const [busyId, setBusyId] = useState<number | null>(null);
-  const [cancelTarget, setCancelTarget] = useState<InvoiceSummary | null>(null);
-  const [reason, setReason] = useState("");
-  // Whether each invoice has an archived PDF; unknown (absent) until its status was read.
-  const [archived, setArchived] = useState<Record<number, boolean>>({});
-  const exp = useInvoiceExport({
-    settings,
-    bank: null,
-    onInvoiceUpdated: (inv) => setArchived((a) => ({ ...a, [inv.id]: Boolean(inv.archivedPdfSha256) })),
-  });
+  const [filters, setFilters] = useState<HistoryFilters>(NO_FILTERS);
+  const [sort, setSort] = useState<SortSpec>({ key: "date", dir: "desc" });
+  const [page, setPage] = useState(1);
+  const [pageSize, setPageSize] = useState(PAGE_SIZES[0]);
+  const exp = useInvoiceExport({ settings, bank: null });
 
   const load = async () => {
     try {
@@ -50,29 +84,31 @@ export default function InvoiceHistory({ settings, active }: { settings: Setting
     }
   };
 
-  // The view stays mounted, so refetch every time it is shown again.
+  // The view stays mounted, so refetch every time it is shown again (a payment may have been recorded).
   useEffect(() => {
     if (active) void load();
   }, [active]);
 
-  // Read each invoice's archive status in the background; it is a local call per row.
-  useEffect(() => {
-    let stop = false;
-    void (async () => {
-      for (const row of rows) {
-        if (stop) return;
-        try {
-          const status = await api.archiveStatus(row.id);
-          if (!stop) setArchived((a) => ({ ...a, [row.id]: status.archived }));
-        } catch {
-          // Unknown stays unknown: the row just shows no tag.
-        }
-      }
-    })();
-    return () => {
-      stop = true;
-    };
-  }, [rows]);
+  const patch = (change: Partial<HistoryFilters>) => {
+    setFilters((f) => ({ ...f, ...change }));
+    setPage(1);
+  };
+
+  const currentFy = currentFyStartYear();
+  const tileFy = filters.fy === "all" ? currentFy : filters.fy;
+  const filtered = useMemo(() => filterInvoices(rows, filters), [rows, filters]);
+  const sorted = useMemo(() => sortInvoices(filtered, sort), [filtered, sort]);
+  const totals = useMemo(() => totalsOf(filtered), [filtered]);
+  const summary = useMemo(() => fySummary(rows, tileFy), [rows, tileFy]);
+  const years = useMemo(() => fyOptions(rows, currentFy), [rows, currentFy]);
+  const clients = useMemo(() => clientOptions(rows), [rows]);
+  const filtersActive = JSON.stringify(filters) !== JSON.stringify(NO_FILTERS);
+
+  const lastPage = Math.max(1, Math.ceil(sorted.length / pageSize));
+  const shown = sorted.slice((Math.min(page, lastPage) - 1) * pageSize, Math.min(page, lastPage) * pageSize);
+
+  const onSort = (key: SortKey) =>
+    setSort((s) => (s.key === key ? { key, dir: s.dir === "asc" ? "desc" : "asc" } : { key, dir: key === "date" || key === "total" || key === "balance" ? "desc" : "asc" }));
 
   const onExport = async (id: number, mode: ExportMode, source: ExportSource) => {
     setBusyId(id);
@@ -87,42 +123,10 @@ export default function InvoiceHistory({ settings, active }: { settings: Setting
     }
   };
 
-  const onArchive = async (id: number) => {
-    setBusyId(id);
-    try {
-      const invoice = await api.getInvoice(id);
-      const outcome = await renderAndArchive(invoice, createExportDeps({ settings, bank: null }));
-      if (outcome.archived) {
-        setArchived((a) => ({ ...a, [id]: true }));
-        toast.success(`Invoice ${invoice.number} is archived`);
-      } else {
-        toast.error("Could not archive the PDF", `Invoice ${invoice.number}: ${outcome.error ?? "the PDF could not be archived."}`);
-      }
-    } catch (e) {
-      toast.error("Could not archive the PDF", String(e));
-    } finally {
-      setBusyId(null);
-    }
-  };
-
-  const onCancel = async () => {
-    if (!cancelTarget) return;
-    try {
-      await api.cancelInvoice(cancelTarget.id, reason);
-      toast.success(`Invoice ${cancelTarget.number} cancelled`);
-      setCancelTarget(null);
-      setReason("");
-      await load();
-    } catch (e) {
-      setCancelTarget(null);
-      toast.error("Could not cancel the invoice", String(e));
-    }
-  };
-
   return (
     <div className="voiced-page">
       <h1 className="voiced-page__title">Invoices</h1>
-      <p className="voiced-page__subtitle">Every invoice you have issued, newest first.</p>
+      <p className="voiced-page__subtitle">Every invoice you have issued. Open one to see its PDF, record payments or export it.</p>
 
       <ExportFeedback exp={exp} />
 
@@ -131,98 +135,191 @@ export default function InvoiceHistory({ settings, active }: { settings: Setting
       ) : rows.length === 0 ? (
         <div className="voiced-empty">No invoices yet. Create one from “New invoice”.</div>
       ) : (
-        <TableContainer>
-          <Table aria-label="Invoices">
-            <TableHead>
-              <TableRow>
-                <TableHeader>Number</TableHeader>
-                <TableHeader>Date</TableHeader>
-                <TableHeader>Client</TableHeader>
-                <TableHeader>Total</TableHeader>
-                <TableHeader>Status</TableHeader>
-                <TableHeader>Actions</TableHeader>
-              </TableRow>
-            </TableHead>
-            <TableBody>
-              {rows.map((row) => (
-                <TableRow key={row.id}>
-                  <TableCell>{row.number}</TableCell>
-                  <TableCell>{formatDate(row.invoiceDate)}</TableCell>
-                  <TableCell>{row.clientName || "—"}</TableCell>
-                  <TableCell>₹{formatAmount(row.total)}</TableCell>
-                  <TableCell>
-                    <div className="voiced-header-action">
-                      {row.status === "cancelled" ? (
-                        <Tag type="red" size="sm">
-                          Cancelled
-                        </Tag>
-                      ) : (
-                        row.status
-                      )}
-                      {archived[row.id] === false ? (
-                        <Tag type="warm-gray" size="sm">
-                          Not archived
-                        </Tag>
-                      ) : null}
-                    </div>
-                  </TableCell>
-                  <TableCell>
-                    <div className="voiced-header-action">
-                      {archived[row.id] === false ? (
-                        <Button kind="ghost" size="sm" onClick={() => void onArchive(row.id)} disabled={busyId !== null || exp.busy}>
-                          {busyId === row.id ? "Working…" : "Render & archive"}
-                        </Button>
-                      ) : null}
-                      <OverflowMenu
-                        aria-label={`Actions for invoice ${row.number}`}
-                        iconDescription="Actions"
-                        flipped
-                        size="sm"
-                        disabled={busyId !== null || exp.busy}
-                      >
-                        <OverflowMenuItem itemText="Export PDF (original as issued)" onClick={() => void onExport(row.id, "searchable", "original")} />
-                        <OverflowMenuItem itemText="Export flattened PDF" onClick={() => void onExport(row.id, "flattened", "original")} />
-                        <OverflowMenuItem itemText="Re-render with current template" onClick={() => void onExport(row.id, "searchable", "rerender")} />
-                        {row.status === "issued" ? (
-                          <OverflowMenuItem
-                            itemText="Cancel invoice"
-                            hasDivider
-                            isDelete
-                            onClick={() => {
-                              setReason("");
-                              setCancelTarget(row);
-                            }}
-                          />
-                        ) : null}
-                      </OverflowMenu>
-                    </div>
-                  </TableCell>
-                </TableRow>
-              ))}
-            </TableBody>
-          </Table>
-        </TableContainer>
-      )}
+        <>
+          <section aria-label={`Summary for ${fyLabel(tileFy)}`}>
+            <h2 className="voiced-history__fy">{fyLabel(tileFy)}</h2>
+            <div className="voiced-history__tiles">
+              <Tile>
+                <p className="voiced-muted">Invoiced</p>
+                <p className="voiced-history__amount">{formatPaise(summary.invoicedPaise)}</p>
+                <p className="voiced-muted">{summary.count} invoices</p>
+              </Tile>
+              <Tile>
+                <p className="voiced-muted">Received</p>
+                <p className="voiced-history__amount">{formatPaise(summary.receivedPaise)}</p>
+              </Tile>
+              <Tile>
+                <p className="voiced-muted">TDS deducted</p>
+                <p className="voiced-history__amount">{formatPaise(summary.tdsPaise)}</p>
+              </Tile>
+              <Tile>
+                <p className="voiced-muted">Outstanding</p>
+                <p className="voiced-history__amount">{formatPaise(summary.outstandingPaise)}</p>
+              </Tile>
+              <Tile className={summary.overdueCount > 0 ? "voiced-history__tile--overdue" : undefined}>
+                <p className="voiced-muted">Overdue</p>
+                <p className="voiced-history__amount">{formatPaise(summary.overduePaise)}</p>
+                <p className="voiced-muted">{summary.overdueCount} invoices</p>
+              </Tile>
+            </div>
+          </section>
 
-      <Modal
-        open={cancelTarget !== null}
-        danger
-        modalHeading={`Cancel invoice ${cancelTarget?.number ?? ""}?`}
-        primaryButtonText="Cancel invoice"
-        secondaryButtonText="Keep invoice"
-        onRequestClose={() => setCancelTarget(null)}
-        onRequestSubmit={onCancel}
-      >
-        <p style={{ marginBottom: "1rem" }}>
-          The invoice stays in the list as cancelled and its number is not reused.
-        </p>
-        <TextInput
-          id="cancelReason"
-          labelText="Reason (optional)"
-          value={reason}
-          onChange={(e) => setReason(e.target.value)}
-        />
-      </Modal>
+          <div className="voiced-history__filters" role="search">
+            <Search
+              id="historySearch"
+              size="md"
+              labelText="Search invoices"
+              placeholder="Number, client or PO number"
+              value={filters.search}
+              onChange={(e) => patch({ search: e.target.value })}
+              onClear={() => patch({ search: "" })}
+            />
+            <Select id="historyStatus" size="md" labelText="Status" value={filters.status} onChange={(e) => patch({ status: e.target.value as StatusFilter })}>
+              {STATUS_FILTERS.map((s) => (
+                <SelectItem key={s.id} value={s.id} text={s.label} />
+              ))}
+            </Select>
+            <Select
+              id="historyFy"
+              size="md"
+              labelText="Financial year"
+              value={String(filters.fy)}
+              onChange={(e) => patch({ fy: e.target.value === "all" ? "all" : Number(e.target.value) })}
+            >
+              <SelectItem value="all" text="All years" />
+              {years.map((y) => (
+                <SelectItem key={y} value={String(y)} text={fyLabel(y)} />
+              ))}
+            </Select>
+            <Select
+              id="historyMonth"
+              size="md"
+              labelText="Month"
+              value={String(filters.month)}
+              onChange={(e) => patch({ month: e.target.value === "all" ? "all" : Number(e.target.value) })}
+            >
+              <SelectItem value="all" text="All months" />
+              {FY_MONTHS.map((m) => (
+                <SelectItem key={m.month} value={String(m.month)} text={m.label} />
+              ))}
+            </Select>
+            <Select id="historyClient" size="md" labelText="Client" value={filters.client} onChange={(e) => patch({ client: e.target.value })}>
+              <SelectItem value="all" text="All clients" />
+              {clients.map((c) => (
+                <SelectItem key={c} value={c} text={c} />
+              ))}
+            </Select>
+            {filtersActive ? (
+              <Button kind="ghost" size="md" onClick={() => patch({ ...NO_FILTERS })}>
+                Clear filters
+              </Button>
+            ) : null}
+          </div>
+
+          {sorted.length === 0 ? (
+            <div className="voiced-empty">No invoices match these filters.</div>
+          ) : (
+            <TableContainer>
+              <Table aria-label="Invoices">
+                <TableHead>
+                  <TableRow>
+                    {COLUMNS.map((c) => (
+                      <TableHeader
+                        key={c.key}
+                        isSortable
+                        isSortHeader={sort.key === c.key}
+                        sortDirection={sort.key === c.key ? (sort.dir === "asc" ? "ASC" : "DESC") : "NONE"}
+                        onClick={() => onSort(c.key)}
+                        className={c.numeric ? "voiced-num" : undefined}
+                      >
+                        {c.label}
+                      </TableHeader>
+                    ))}
+                    <TableHeader>
+                      <span className="cds--assistive-text">Actions</span>
+                    </TableHeader>
+                  </TableRow>
+                </TableHead>
+                <TableBody>
+                  {shown.map((row) => {
+                    const badge = statusBadge(row.status, row.paymentStatus);
+                    return (
+                      <TableRow key={row.id} className="voiced-history__row" onClick={() => onOpen(row.id)}>
+                        <TableCell>
+                          <Link
+                            href="#"
+                            onClick={(e: React.MouseEvent) => {
+                              e.preventDefault();
+                              e.stopPropagation();
+                              onOpen(row.id);
+                            }}
+                          >
+                            {row.number}
+                          </Link>
+                        </TableCell>
+                        <TableCell>{formatDate(row.invoiceDate)}</TableCell>
+                        <TableCell>{row.clientName || "—"}</TableCell>
+                        <TableCell className="voiced-num">{formatPaise(row.totalPaise)}</TableCell>
+                        <TableCell className="voiced-num">{row.status === "cancelled" ? "—" : formatPaise(row.balancePaise)}</TableCell>
+                        <TableCell>
+                          <Tag type={badge.type} size="sm">
+                            {badge.label}
+                          </Tag>
+                          {row.status === "issued" && row.paymentStatus === "overdue" && row.paidPaise + row.tdsPaise > 0 ? (
+                            <Tag type="blue" size="sm">
+                              Partly paid
+                            </Tag>
+                          ) : null}
+                        </TableCell>
+                        <TableCell onClick={(e: React.MouseEvent) => e.stopPropagation()}>
+                          <OverflowMenu
+                            aria-label={`Actions for invoice ${row.number}`}
+                            iconDescription="Actions"
+                            flipped
+                            size="sm"
+                            disabled={busyId !== null || exp.busy}
+                          >
+                            <OverflowMenuItem itemText="Open" onClick={() => onOpen(row.id)} />
+                            <OverflowMenuItem itemText="Export PDF (original as issued)" onClick={() => void onExport(row.id, "searchable", "original")} />
+                            <OverflowMenuItem itemText="Export flattened PDF" onClick={() => void onExport(row.id, "flattened", "original")} />
+                          </OverflowMenu>
+                        </TableCell>
+                      </TableRow>
+                    );
+                  })}
+                </TableBody>
+              </Table>
+              <div className="voiced-history__totals" role="status" aria-label="Totals for the filtered invoices">
+                <span className="voiced-muted">
+                  {filtersActive ? "Filtered" : "All"}: {totals.count} invoices
+                </span>
+                <span>
+                  Invoiced <strong>{formatPaise(totals.invoicedPaise)}</strong>
+                </span>
+                <span>
+                  Received <strong>{formatPaise(totals.receivedPaise)}</strong>
+                </span>
+                <span>
+                  TDS <strong>{formatPaise(totals.tdsPaise)}</strong>
+                </span>
+                <span>
+                  Outstanding <strong>{formatPaise(totals.outstandingPaise)}</strong>
+                </span>
+              </div>
+              <Pagination
+                page={Math.min(page, lastPage)}
+                pageSize={pageSize}
+                pageSizes={PAGE_SIZES}
+                totalItems={sorted.length}
+                onChange={({ page: p, pageSize: s }: { page: number; pageSize: number }) => {
+                  setPage(s !== pageSize ? 1 : p);
+                  setPageSize(s);
+                }}
+              />
+            </TableContainer>
+          )}
+        </>
+      )}
     </div>
   );
 }
diff --git a/src/views/NewInvoice.tsx b/src/views/NewInvoice.tsx
index 59c5356..2536c85 100644
--- a/src/views/NewInvoice.tsx
+++ b/src/views/NewInvoice.tsx
@@ -84,6 +84,9 @@ interface NewInvoiceProps {
   active: boolean;
   /** Ask the shell to show this view (used by Ctrl+N from another tab). */
   onActivate: () => void;
+  /** A draft to open as soon as the form is shown (set by "Duplicate" on the invoice page). */
+  openDraftId?: number | null;
+  onDraftOpened?: () => void;
 }
 
 const AUTOSAVE_MS = 1000;
@@ -94,7 +97,7 @@ const formatStamp = (iso: string) => {
   return Number.isNaN(d.getTime()) ? iso : `${d.toLocaleDateString("en-GB")} ${formatTime(d)}`;
 };
 
-export default function NewInvoice({ settings, onSettingsChange, active, onActivate }: NewInvoiceProps) {
+export default function NewInvoice({ settings, onSettingsChange, active, onActivate, openDraftId = null, onDraftOpened }: NewInvoiceProps) {
   const toast = useToast();
   const newItem = (): InvoiceItem => ({ ...EMPTY_ITEM, hsnSac: settings.defaultHsnSac });
   const blankState = (): InvoiceFormState => {
@@ -562,6 +565,14 @@ export default function NewInvoice({ settings, onSettingsChange, active, onActiv
     }
   };
 
+  useEffect(() => {
+    if (openDraftId === null || !active) return;
+    onDraftOpened?.();
+    void resumeDraft(openDraftId);
+    // resumeDraft closes over fresh state each render; only a new request should trigger it.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [openDraftId, active]);
+
   const removeDraft = async (id: number) => {
     try {
       await api.deleteDraft(id);