Help Center / Invoicing and payments /
Invoice numbering and prefixes
Every invoice gets a unique number, generated automatically in sequence. The numbering format, prefix, and starting number are all configurable, so invoice numbers can follow an existing accounting convention or business format.
How invoice numbers are generated
Invoice numbers increment sequentially from a starting number. Each new invoice receives the next number in the sequence automatically, with no manual input needed. The sequence is workspace-wide, so numbers are unique across all clients and projects.
Custom prefixes
A prefix can be added to prepend every invoice number. Common prefixes include "INV-", a year identifier like "2026-", or a business abbreviation. The prefix is set in invoice settings and applies to all new invoices going forward. Existing invoices keep their original numbers unchanged.
Setting the starting number
The starting number can be set to any value, which is useful when migrating from another invoicing tool. Setting the starting number to 1001, for example, means the next invoice created will be numbered 1001, and subsequent invoices increment from there. The starting number only affects future invoices.
Configurable prefixes and starting numbers mean invoice numbering can continue from a previous tool without gaps or resets, keeping accounting records consistent.