Free tool

Is my invoice numbering okay?

Answer a few simple questions and find out if your invoice number sequence has any common problems.

Why invoice numbering matters

Spanish invoicing rules require invoices to be issued in a clear, unbroken sequential order. Numbers cannot be reused, skipped without reason, or reset mid-series without documentation.

Under Veri*Factu requirements, this matters even more — the invoice chain needs to be traceable and consistent.

Common problems to check for

Duplicate invoice numbers
Gaps or skipped numbers
Restarting numbers mid-year without reason
Mixing personal and business invoice sequences
Different numbering series without documentation
Numbers that don't follow a clear pattern

General guidance only. Confirm your invoice numbering setup with your gestor, especially if migrating from another system.

Check your invoice numbering

Answer all questions for your result.

Do your invoices follow a clear sequence?

Do you use a prefix like FAC-2027-001?

Have you ever reused an invoice number?

Are there gaps in your invoice list?

Has your gestor approved your numbering method?

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Clean records, fewer questions, faster quarter-end handover.

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