Field help: Business identification number

Please enter the business identification number (Wirtschafts-Identifikationsnummer) that was assigned to you by the Federal Central Tax Office (BZSt) for your rental or leasing activities.

The structure of the business identification number is as follows:

• It always begins with the prefix "DE".
• This is followed by 9 digits, whereby the ninth digit is always the check digit.
• This is followed by a hyphen.
• A 5-digit distinguishing number follows at the end.

The W-IdNr. is issued to all economic operators, in particular:

• Natural persons who carry out rental or leasing activities,
• Legal persons (e.g. companies),
• Personal associations (e.g. communities of owners).