Hungarian Value Added Tax Number

Detects Hungarian Value Added Tax Number patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. VAT numbers have country-specific prefixes that aid detection accuracy.

Type: regex
Engine: universal
Confidence: high
Confidence justification: High confidence: the HU prefix followed by exactly 8 digits is a distinctive format for Hungarian VAT numbers. Added context gating and exclusion rules improve precision and reduce incidental matches.
Detection quality: Verified
Jurisdictions: hu, eu
Regulations: GDPR
Data categories: financial, business-identifier
Scope: narrow
Risk rating: 5
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\bHU\d{8}\b

Corroborative evidence keywords

ÁFA, áfa-szám, VAT, adószám, value added tax, VAT number, belasting, BTW, Mehrwertsteuer, TVA, Umsatzsteuer, VAT registration, BTW-nummer, numéro de TVA, Steuernummer, tax number, tax registration, taxe sur la valeur ajoutée, imposta sul valore aggiunto, intracommunautaire (+56 more)

Proximity: 300 characters

Should match

HU12345678 — Standard Hungarian VAT number format
HU98765432 — Hungarian VAT number with HU prefix
HU11223344 — Hungarian VAT identifier

Should not match

HU1234567 — Only 7 digits after HU prefix, too short
PL12345678 — Polish prefix, not Hungarian VAT format
template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

Other identifier schemes that coincidentally share a similar prefix and digit structure Mitigation: Validate the complete format including prefix and digit count. Layer with document context to confirm financial or tax-related content.
Test or example VAT numbers used in documentation or training materials Mitigation: Maintain an allow-list of known test/example numbers. Use document classification to distinguish production data from training content.

References

Hungarian Value Added Tax Number entity definition - Microsoft Learn