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Invoice Numbering

1 article

Management Aug 18, 2026 · 5 min read

Invoice numbering: the rules, and why a gap in the sequence is a problem

Invoice numbering has to be unique and unbroken. What a legal sequence looks like, which formats survive an audit, and how to fix a gap you already have.

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EU e-invoices (EN 16931, Peppol BIS 3.0)