Austria UID Validation
Validate Austria UID (ATU) Number Online
Verify Austrian UID-Nummer status, VIES registration, and entity details for free. Check ATU format and validate against FinanzOnline.
Understanding Austria UID Format
The UID-Nummer (Umsatzsteuer-Identifikationsnummer) must start with 'ATU' followed by 8 digits.
Code
Identifier
Digits
- ✓ Structure: Must start with 'AT' (Austria) + 'U' (Umsatzsteuer). Total 11 characters.
- ✓ UID vs Steuernummer: UID is for international trade (VIES). Steuernummer is for local tax.
- ✓ Validation: Checks format (ATU regex) and active status via VIES/FinanzOnline.
Frequently Asked Questions
Can I check UID on FinanzOnline?
Yes, FinanzOnline is the official Austrian portal for tax administration. However, for quick batch validation or API integration, third-party tools like Lookuptax are faster.
Difference between UID and Firmenbuchnummer?
The UID-Nummer (e.g., ATU...) is for VAT and tax purposes. The Firmenbuchnummer (e.g., FN 123456 x) is the Commercial Register number identifying the legal entity.
What exactly is an 'ATU' number?
"ATU Number" is a common nickname for the Austrian VAT ID. It simply refers to the mandatory prefix: AT (Austria) + U (Umsatzsteuer).
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