Question 1

What does the USt-IdNr. checker do?

Accepted Answer

It validates the format and check digit of EU VAT IDs (USt-IdNr.) for Germany, Austria, Netherlands, France, Belgium, Italy, Poland, Portugal, Slovenia, Croatia, Slovakia, and Hungary. It does not query tax authorities or VIES; it only checks that the number is structurally valid.

Question 2

Does this replace VIES or the Finanzamt?

Accepted Answer

No. This is a technical format and checksum check only. To verify that a VAT ID is actually registered and valid, use the EU VIES portal or your tax authority. This tool helps you catch typos and invalid formats before submitting to VIES.

Question 3

Which countries are supported for VAT ID validation?

Accepted Answer

DE, AT, NL, FR, BE, IT, PL, PT, SI, HR, SK, and HU. Each country has its own format and check digit algorithm; the tool applies the correct rules per country.

USt-IdNr. prüfen – Format & Prüfziffer