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Austria TIN validator
Check whether a Austria Steuernummer follows the expected structure before you save it, send it to an API, or include it in a tax workflow.
Private by design
Your data stays in your browser
None of the TIN data you enter is ever saved to our servers — validation runs entirely on your device.
Validation Workspace
Validate Steuernummer
Enterprise checks for Austria tax identification numbers.
Instant one-by-one format validation
How Austria tax IDs are formatted
In Austria, the tax identifier is commonly known as Steuernummer (Steuernummer). The expected format is 9 digits (XX-XXX/XXXX) with checksum. Teams usually need a Austria Steuernummer check around tax declarations, employment, business operations, or before a record moves into billing, onboarding, or compliance review.
Valid examples
12-345/678998-765/4321
Invalid examples
- 12-345/678 (Too short)
- 12-345/6788 (Invalid checksum)
What this validator checks
Format and length
Confirms the number follows the expected Austria pattern: 9 digits (XX-XXX/XXXX) with checksum.
Checksum logic
Runs the checksum rule used by Austria when the public format includes one, helping catch typos that still look correctly formatted.
Useful examples
Shows valid and invalid-looking samples so you can compare spacing, separators, letters, and digit counts before submitting real data.
When people usually check this number
- Tax declarations
- Employment
- Business operations
A format match does not prove that a Austria tax ID belongs to a specific person or business. Use the result as a first-pass data quality check, then confirm sensitive cases with official records.
Official source: Bundesministerium für Finanzen
Last reviewed: May 23, 2026. We update country guidance when public format rules change.
How to check a Austria Steuernummer
Use this check before a record reaches billing, tax reporting, or manual review.
Enter the Steuernummer
Paste or type the Austria tax identifier exactly as it appears in your source record. Spaces and separators are fine when they are part of the expected format.
Review the format result
Check whether the number matches the known Austria structure, including length, separators, letters, and checksum rules where public guidance includes them.
Confirm important records
For onboarding, tax reporting, or compliance work, treat the result as a data-quality signal and confirm high-risk records with Bundesministerium für Finanzen or your internal process.
Frequently asked questions
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