Invoice numbering rules
Every invoice in the Netherlands needs a unique invoice number. Below the basic rules and how FactuurSturen.app fills them in automatically. Not an accounting app and not tax advice.
What the Belastingdienst expects
Unique per invoice
No two invoices may share a number. FactuurSturen.app prevents duplicates by counting up automatically.
Sequential — no gaps
Numbers run in order without gaps. If you skip one, you must be able to explain why. FactuurSturen.app keeps the right sequence automatically.
Custom prefix allowed
You can use a prefix like FF-2026-001 or include the year. FactuurSturen.app lets you set your own prefix — appears on every invoice.
Cancelled invoices
Issued an invoice by mistake? Create a credit note and a new invoice. The original number stays in your records. FactuurSturen.app tracks the status.
Frequently asked questions
Can I restart numbering every year?
Yes, as long as numbering remains unique and sequential within that range. Many businesses use the year in the prefix (e.g. 2026-001) so you can see it at a glance.
What if I skip a number?
You must be able to show why a number is missing. In practice this rarely happens if you use a tool that numbers automatically. If unsure, ask a tax advisor.
Can I choose my first invoice number?
Yes. In settings you set the starting number (e.g. 100 instead of 1). FactuurSturen.app counts up from there automatically.
Disclaimer
This explanation is informational — for your specific situation, consult the Belastingdienst (belastingdienst.nl) or a tax advisor. FactuurSturen.app helps you create invoices, not file your tax return.
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