What is Invoice number range (Nummernkreis)?
An invoice number range (Nummernkreis) is how you assign unique sequential invoice numbers. Gaps and reused numbers are problematic — corrections go through credit notes with a new number.
Practice tips
- Pick one scheme (e.g. year + running number)
- Never reuse a number
- Do not “fix” invoices by overwriting the old number
General information only — not legal or tax advice. Tax and e-invoice rules can change; the applicable laws control (e.g. § 19 UStG, § 14 UStG). Confirm with a tax advisor or lawyer if unsure.