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

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.

Process flow

You must submit the request to determine the church tax deduction feature (KiStAM) via the BZStOnline-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 for activating your BOP account by post.
  • 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 feedback on your request via your mailbox in your BOP account.

Competent authority

The Central Tax Office (BZSt)


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 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.

Which documents are required?

  • Inquiry data record of the creditor of the chapter income

What are the fees?

There are no costs.

What deadlines do I have to pay attention to?

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.

Processing duration

  • 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

Applications / forms

  • Forms available: Yes
  • Written form required: Yes
  • Informal application possible: No
  • Personal appearance necessary: No
  • Online services available: Yes


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

Technically approved by

Federal Ministry of Finance (BMF) on behalf of the Point of Single Contact of the Federal States (EAP)

Professionally released on



The text was automatically translated based on the German content.

competent Bodies

Bundeszentralamt für Steuern (BZSt)
Address: An der Küppe 1, 53225 Bonn, Stadt
Remark: Headquarters Bonn-Beuel
Telephone: +49 228 406-0
Fax: +49 228 406-2661
Opening Hours:

Monday to Friday: 8:00 a.m. to 4:00 p.m.

Data protection information

Landkreis Emsland
Address: Ordeniederung 1 , 49716 Meppen
Postal address: Post Office Box 15 62 , 49705 Meppen
Telephone: 05931 44-0
Fax: 05931 44-3621
Transport Connection:
Station Haltestelle Kreishaus
Bus: 993

Building Access
elevator available, wheelchair-accessible
bank account:
recipients: Landkreis Emsland
bank: Emsländische Volksbank
IBAN: DE26266600600120050000
recipients: Landkreis Emsland
bank: Sparkasse Emsland
IBAN: DE39266500010000001339
recipients: Landkreis Emsland
bank: Postbank Hannover
IBAN: DE36250100300012132306


Marc-André Burgdorf
responsible for:
Bernd Otten (Datenschutzbeauftragter)
Telephone: 05931 44-1605
Fax: 05931 44-391605
responsible for:

Landesbeauftragte für den Datenschutz Niedersachsen
Address: Prinzenstraße 5, 30159 Hannover
Telephone: +49 511 12045-00
Fax: +49 511 12045-99

Source: Serviceportal Niedersachsen (Portalverbund des Bundes und der Länder)