Austrian Steuernummer
Validator
Check whether an Austrian Steuernummer (Abgabenkontonummer) is correctly formatted and passes the official BMF Luhn checksum — entirely in your browser.
About Steuernummer Validation
Validation ensures both the structural correctness and mathematical integrity of the Austrian tax account number.
The tool accepts numbers with standard separators (59-119/9013) or the unformatted 9-digit sequence.
Steuernummer / Abgabenkontonummer Anatomy
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 and 2 | Tax Office Code | 2 digits | Responsible tax office jurisdiction (e.g. 59 St. Veit Wolfsberg) | 59 |
| 3 to 5 | Block 1 | 3 digits | First part of the account sequential | 119 |
| 6 to 8 | Block 2 | 3 digits | Second part of the account sequential | 901 |
| 9 | Check Digit | 1 digit | Luhn Modulo 10 check digit | 3 |
Luhn Validation Rules
| Step | Description |
|---|---|
| 1. Clean the input | Strip hyphens, slashes, and whitespace from the entered value. |
| 2. Check the length | Confirm the cleaned value is exactly 9 numeric digits. |
| 3. Weight and sum the digits | Digits at positions 2, 4, 6, 8 (1-indexed) are doubled with digit-sum reduction if ≥10; positions 1, 3, 5, 7 are used as-is. |
| 4. Compare the checksum | The check digit is (10 − (Sum mod 10)) mod 10, which must match the 9th digit. |
Frequently Asked Questions (FAQ)
Can I validate numbers without hyphens or slashes?
Yes — paste the number with or without separators (59-119/9013 or 591199013), both are cleaned and checked the same way.
What is the difference between Steuernummer and UID (ATU)?
The Steuernummer is the taxpayer's general account number with their local Finanzamt. The UID (ATU) is a separate EU-facing VAT identification number used for cross-border trade.
Are the generated numbers official or real?
No. This validator only checks the format and Luhn checksum — it does not look up any real taxpayer account with the BMF. A result of "valid" means the number is mathematically well-formed, not that it belongs to a real taxpayer.