Invoice Number Generator
Generate the next invoice number in your sequence. Choose your prefix, year format, and starting number. Works fully in your browser — nothing sent anywhere.
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This runs inside BusinessOS too — and much more.
Full invoicing, encrypted data, offline mode, WhatsApp send, voice-to-invoice. Free during limited early access.
Open BusinessOSCommon questions
What's the standard format for invoice numbers?
Most businesses use PREFIX-YEAR-NUMBER (like INV-2026-0001). Sequential numbering is a legal requirement in most countries and helps you track invoices in order.
Can I reset my invoice numbers every year?
Yes. Many businesses restart the counter each January with the year in the middle: INV-2026-0001, INV-2027-0001. Both patterns are accepted by tax authorities.
Do invoice numbers have to be sequential?
In most tax systems yes — sequential without gaps. If you cancel an invoice, don't reuse the number; issue a credit note instead.