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, data record, database record, record set, data extract, data export, database table, spreadsheet, data registry, registry entry, master data (+13 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