Where can I find the 13-digit tax number?

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Ultimo aggiornamento il 2025-08-06.

The tax number can be found in various official documents, such as:

Income tax assessment notice

Wage tax statement or payslip

Exemption order for capital gains (issued by your bank)

If the number cannot be found, please reach out to the respective tax office.

 

💡 In the fiskaly SIGN DE x Submission API, the tax number corresponds to the field tax_number.

 

With the BMF’s tax number converter, a state-specific tax number can easily be converted into the standardized 13-digit ELSTER tax number.