(2025) Where can I find my tax ID number?

Your tax identification number was sent to you in writing by the Federal Central Tax Office. The eleven-digit number is valid for life. In this letter, the number is referred to as the "Personal Identification Number", but it is often simply called the "Identification Number" and is usually abbreviated as TIN (Tax Identification Number) or Steuer-ID.

You can usually find your identification number

• on your income tax assessment notice or
• on your payslip

The tax ID is not to be confused with the eTIN, which is also found on the payslip and is used by the employer for the transmission of wage data.

After a transition period, the tax identification number is intended to replace the current tax number for income tax. Providing the tax identification number is not a prerequisite for submitting your tax return.