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Request tax identification number (IdNr) or church tax deduction feature (KiStAM)

If your company is obliged to deduct church tax, you can submit a request for the church tax deduction feature for your company.

Online services

Online services

  • BZSt-Online-Portal (BOP)
    Das BZSt-Online-Portal (BOP) ermöglicht Ihnen die elektronische Übermittlung von Daten an das BZSt. Als Identifizierungsmittel sind ein ELSTER-Konto oder eine BOP-Zertifikatsdatei und Passwort erforderlich.

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Procedure details

In order to withhold church tax on capital gains tax, those obliged to withhold church tax, for example banks, must ask the Federal Central Tax Office (BZSt) whether their customers are liable for church tax.

You will need the tax identification number (IdNr) of the taxpayer to make the inquiry. If you do not have the tax identification number, you can request it at the same time.
You submit your request via the BZSt online portal (BOP).

To be able to submit the request via the BOP, you must first register your company there. The registration process can take up to 3 weeks.

Inquiries can be made:

  • Church tax deductors

Further requirements:

  • You must register your company on the BZSt online portal (BOP).
  • You must submit an application for your company to be admitted to the procedure for the electronic transmission of data in accordance with Section 51a (2c) of the German Income Tax Act (EStG) (church tax on flat-rate withholding tax).
  • You can only submit a request for the tax identification number (IdNr) of a natural person if
    • their IdNr is unknown and
    • your company potentially has to withhold capital gains tax for this person.

  • Required Documents
    • Inquiry data record of the creditor of the chapter income

You must submit the request to determine the church tax deduction feature (KiStAM) via the BZSt online portal (BOP).

  • You first need a certificate for the BOP.
    • To do this, go to the website of the Federal Central Tax Office (BZSt) and apply for registration online.
    • Complete the application online and print it out.
    • Sign the application and send it to the BZSt by post.
  • The BZSt will then send you instructions by post on how to activate your BOP account.
  • Follow the instructions and activate your BOP account on the BOP.
    • Note: If you already have an ELSTER certificate, you can also use this to log in to the BOP.
  • You must then submit an application via the BOP for admission to the procedure for the electronic transmission of data in accordance with Section 51a (2c) of the Income Tax Act (EStG) (church tax on flat-rate withholding tax). Complete the application online.
  • If your application is approved, you will receive your registration number by post from the BZSt. You will need this for the KiStAM request.
  • You can now submit KiStAM requests via the BOP. If you do not know the tax identification number (IdNr) of the person to be queried, select the combined query "IdNr. search and KiStAM query".
  • Complete the request online in the BOP and send it electronically via the BOP.
  • You will then receive a response to your request via your mailbox in your BOP account.

There are no costs.

Regular queries relevant for the following year (Section 51a (2c) sentence 1 no. 3 and sentence 1 EstG) must be made in the period from September 1 to October 31. Other queries, such as queries for specific reasons, for example when a business relationship is established, can be made at any time.

  • for the activation of the BOP account: 1 to 3 weeks
  • for admission to the church tax on withholding tax procedure: 1 to 2 weeks
  • for the response to the KiStAM request: 1 to max. 3 days

  • Objection against non-admission to the proceedings
  • Fiscal court action

Status: 22.08.2024
Editorially responsible for prodecure description: Bundesministerium der Finanzen
Source: Federal Portal