Germany STNR Validator
Validate German Tax Numbers
Enter a German Tax Number to verify its validity.
About this Validator
This tool validates German Tax Numbers according to regional and federal format requirements.
The validator checks if a given tax number follows the correct structure for both regional and federal formats.
This validation only confirms if a tax number follows the correct format. It does not verify if the number is actually registered with German tax authorities.
What is a German Tax Number (Steuernummer/St.-Nr.)?
Tax Number Structure: • Regional format: 10-11 digits • Federal format: 13 digits Components: • FF(F): Federal tax office number (BUFA-Nr.) • BBB(B): District number • UUUU/UUU: Serial number • P: Check digit • Optional: '0' for electronic format
Validation Features: • Length verification • Format detection • Regional rules check • Federal rules check • Check digit validation
Used for: • Tax administration • Tax declarations • Business registration • Official documents • Regional identification • Federal identification
Technical Notes: • Region-specific formats • Federal standardization • Electronic format rules • Format conversion • Legacy support
If you need to generate a tax number for testing purposes, here is a German Tax Number Generator