The tax number can be found in various official documents, such as:
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Income tax assessment notice
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Wage tax statement or payslip
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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.