Validator US-SSN Mod-11 Germany

Validate German VAT ID number (DE + 9 digits) with official MOD-11 algorithm, §27a UStG/BZSt. Calculate check digit.

Insert VAT ID Number

Format: DE + 9 digits. Spaces and commas are ignored.
Examples:

Come utilizzare Validatore USt-IdNr MOD-11 Germania

Insert VAT ID Number

Format: Follows 9 digits (e.g. DE123456789). Spaces and dashes are ignored.

Automated MOD-11 Validation

The algorithm §27a UStG/BZSt calculates the control digit (9th digit) and compares it with the one inserted.

Interpret the result

View expected vs found checksum and debug format information.

Suggerimenti

  • Valid VAT ID number in VIES and sufficient proof for applying reverse charge in EU B2B operations.
  • Save confirmation of verification VIES (with timestamp) as documentary proof.
  • Not all German businesses have a USt-ID number; they only receive it upon request to the BZSt, not automatically.
  • Tax ID Number can be revoked if the business ceases activity - verify always before major operations.

Domande frequenti

What is the USt-ID Number (Sales Tax Identification Number)?

European German VAT code, formatted DE plus 9 digits. It is assigned by the Federal Central Office for Taxation (BZSt) to German entrepreneurs subject to VAT. Corresponds to the Italian VAT number.

What is the difference between USt-IdNr and Tax Number?

Tax ID number (10-11 digits) is used for local tax office communications. VAT ID number (DE + 9 digits) is used for intra-community operations (B2B EU) and the VIES system.

How does the MOD-11 algorithm work?

Calculate numbers 1-8 in an iterative series: sum = (number + product) % 10 (with 0 replaced by 10), then product = (sum * 2) % 11. The final check digit is (11 - product), with 11 becoming 0.

Where do I verify an overseas supplier's VAT ID number?

Use the EU VAT system (vies.ec.europa.eu) by the European Commission. It provides binding confirmation of your EU VAT registration at the time of verification.