Steuer Id

Detects Steuer Id patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. Users already running Purview may prefer to enable the built-in SIT directly, or use this version as a starting point for customisation.

Type: regex
Engine: universal
Confidence: medium
Confidence justification: Medium confidence: pattern has structural constraints but corroborative keywords are recommended to reduce false positive rates. Added context gating and exclusion rules improve precision and reduce incidental matches.
Detection quality: Verified
Jurisdictions: eu, de
Regulations: BDSG, CNIL / LIL, GDPR
Frameworks: ISO 27001, ISO 27701
Data categories: pii, government-id
Scope: wide
Risk rating: 7
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b\d{11}\b

Corroborative evidence keywords

identifier, number, ID, ID number, identification, ID card, license, permit, registration, certificate, field, column, row, entry, record, value, form, register, database, extract (+16 more)

Proximity: 300 characters

Should match

12345678901 — Standard 11-digit German tax ID
65929970489 — Real-format Steuer-IdNr
00000000001 — Low-range tax ID

Should not match

1234567890 — Only 10 digits instead of 11
123456789012 — 12 digits instead of 11
1234567890A — Contains a letter instead of all digits
template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

Long numeric sequences in unrelated contexts (tracking numbers, serial codes) matching the Steuer Id format Mitigation: Use corroborative keywords and, where available, checksum validation to filter false matches.

References

Germany tax identification number entity definition - Microsoft Learn