In effect: an invoice is paid or revenue sits in a closed period, so line items are read-only. Amend the contract to change them.
The invoice schedule: Unbilled invoices wait for their invoice date (send them, or let invoice automation send them).
| Invoice Number | Status | Invoice Date | Due Date | Billing period | Amount | Amount Due |
|---|---|---|---|---|---|---|
| INV000000456 | Paid | 08/01/2026 | 08/31/2026 | 08/01/2026 – 08/31/2026 | $15,600.00 | $0.00 |
| INV000000457 | Unpaid | 09/01/2026 | 10/01/2026 | 09/01/2026 – 09/30/2026 | $15,600.00 | $15,600.00 |
| INV000000458 | Unpaid | 10/01/2026 | 10/31/2026 | 10/01/2026 – 10/31/2026 | $15,600.00 | $15,600.00 |