Field help:
Business identification number
Please enter here the business identification number that was assigned to you by the Federal Central Tax Office (BZSt) specifically for your economic activity.
The structure of the business identification number is as follows:
- It always starts with the prefix "DE".
- This is followed by 9 digits, whereby the ninth digit is always the check digit.
- After that, a hyphen is used.
- Finally, there is a five-digit distinguishing number.
Example of a correct W-IdNr.: DE232637828-12345
The W-IdNr. is issued to all economically active persons and entities, including:
- natural persons who generate income from renting and leasing,
- legal persons (e.g. corporations),
- associations of persons (e.g. owners' associations or companies).
The W-IdNr. shall serve as a supplement to the already existing identification numbers such as the tax number and the personal tax identification number (IdNr.), which shall continue to retain their function. It serves to simplify administration and to improve the exchange of data between authorities. The tax number shall continue to be used on all tax forms.
Further information about the W-IdNr. can be found on the Federal Central Tax Office (BZSt) website: www.bzst.de/widnr.
