What is it and when to do it?
When you move, Kindergeld does not stop automatically — you only need to update your address with the Familienkasse (a division of the Bundesagentur für Arbeit). Do this as soon as you receive your Meldebescheinigung, so all letters and notices reach you at the correct address.
Where and how much does it cost?
Updating your address is free. Online: via the Bundesagentur für Arbeit portal in the Familienkasse section. By post: a letter to your Familienkasse with a copy of your Meldebescheinigung. Phone: 0800 4 5555 30 (free of charge). If you move to a different federal state, the responsible Familienkasse changes automatically.
Common mistakes
Moved and didn't inform the Familienkasse. Two months later payments stopped — a letter requesting documents had been returned as undeliverable. Reinstatement took 6 weeks and three payments were delayed. Notify them in the first week after moving.
Thought the Anmeldung automatically updated the Familienkasse records. It doesn't — the Familienkasse has no access to the residents' register. They are completely separate databases and must be updated independently.