If you receive child benefit in Germany (Kindergeld), you have a legal obligation to inform the Familienkasse about any changes in your personal or family situation. This is done using the official form KG45 (Veränderungsmitteilung).
When should you use the KG45 form?
- You change your home address (in Germany or abroad).
- You change your bank account (IBAN/BIC) for Kindergeld payments.
- Your marital status changes (marriage, divorce, separation, death).
- The number of children in your household changes.
- You or your partner start working in another country.
- An adult child’s situation changes (starts/ends studies or begins work).
- You receive similar family benefits in another country.
Download Official KG45 Form (PDF)
Below you can download the latest version of the official form issued by the Familienkasse.
The form is in German — the only version accepted by German authorities.
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Instructions for Filling Out the Form
Step 1: Enter your personal details and Child Benefit Number (Kindergeld-Nr.) at the top.
Step 2: Fill out only the sections that have changed (e.g., new address or new bank account).
Step 3: Use capital letters (Blockschrift) to ensure the document is easy for officials to read.
Step 4: Sign and date the form on the last page and send it via registered mail (Einschreiben) to your local Familienkasse.
