Template: Invoice Numbering Guide

Used for: /invoice-numbering/

Invoice numbering: simple systems that scale

Disclaimer: General guidance only (not legal/tax advice).

Goals

A good invoice numbering system should be:

• Unique (no duplicates)
• Traceable (easy to find)
• Predictable (your future self will thank you)

Common formats

Option A: Year + sequence

• 2026-0001, 2026-0002, ...

Option B: Client prefix + sequence

• ACME-001, ACME-002

Option C: Year + month + sequence

• 2026-02-001

Practical rules

• Don’t reuse numbers (even if you cancel an invoice).
• Store the last used number somewhere reliable.
• If you use multiple brands/projects, add a short prefix.

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