Austria Tax Identification Number

Detects Austria Tax Identification Number patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. Due to the numeric format, corroborative evidence keywords are essential for reliable detection.

Type: regex
Engine: universal
Confidence: medium
Confidence justification: Medium confidence: the digit grouping pattern is not unique. Corroborative evidence such as 'Steuernummer' or 'Finanzamt' is needed to confirm Austrian tax identification.
Detection quality: Verified
Jurisdictions: at, eu
Regulations: GDPR
Data categories: pii, financial, government-id
Scope: narrow
Risk rating: 7
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b\d{2}-?\d{3}/?\d{4}\b

Corroborative evidence keywords

Steuernummer, tax identification, Abgabenkontonummer, Finanzamt, TIN, tax identification number, tax number, tax return, IRD, NIF, tax ID, inland revenue, taxpayer identification, αριθμός φορολογικού μητρώου, ΑΦΜ, φορολογικός, adóazonosító, adószám, belastingnummer, BSN (+33 more)

Proximity: 300 characters

Should match

12-345/6789 — Austrian tax ID with separators
123456789 — Austrian tax ID continuous digits
98-765/4321 — Austrian tax ID alternate format

Should not match

12-34/56789 — Wrong grouping for Austrian tax ID
1-234/5678 — Too few leading digits for Austrian format

Known false positives

Generic numeric sequences in non-tax contexts such as reference numbers or account identifiers Mitigation: Require corroborative evidence keywords within the proximity window to distinguish tax identifiers from general numeric data.
Numbers from other identification schemes with similar digit patterns Mitigation: Layer with jurisdiction-specific detection to prioritise matches in tax-related documents and cross-reference with other identifier types.

References

Austria Tax Identification Number entity definition - Microsoft Learn