Due dates and payment terms

An invoice's due date is computed from its payment terms when you save or issue it with the field left empty; type a date yourself to override it. Payment terms are managed in Settings → Payment terms, and can be defaulted per customer.

1. Define a term in Settings → Payment terms: a name, a number of due days (0–3650), and a due day type. A live example, using today as the issue date, shows the resulting due date as you set it up.
2. The four due-day types: Days after invoice date (issue date + N days), Days after end of invoice month (last day of the issue month + N days), Day of the following month (day N of next month, clamped to that month's length), Day of the current month (day N of the issue month — rolling to next month if that day has already passed).
3. Set the installation's default with Set as default, and a customer-specific default on that customer's Tax & billing section.
4. On the invoice form, the payment terms field is pre-filled from the customer, then the installation default; the due date stays empty until you save or issue, at which point it is computed. Quotes and orders never get a due date.
5. The Invoices list can be filtered and exported by due date.

Related: Create an invoice, Payment reminders, Reference data settings.