# Document numbering

> Prefix, next number and minimum digits per document type; numbers are issued in sequence and a used number is never handed out twice.

Section: Settings and administration · Canonical: https://intubu.intuitivecapital-dai.com/docs/document-numbering

Settings → Numbering.

Each document type — invoice, estimate, credit memo, sales receipt, bill, purchase order, check, and the rest — has its own sequence: a **prefix** (INV-), the **next number** to issue, and the **minimum digits** it is padded to (4 gives INV-1001, INV-1002 …). Change the next number to start from where a previous system left off.

A number is taken when the document is saved, in order; a draft you abandon still keeps its number so an auditor never sees a gap that was silently reused. Typing a number by hand on a document is allowed, and a number that already exists on that type is refused. Voiding keeps the number and the document.