Registration at the municipality office – why is it that important?
You are legally required to register your place of residence in Berlin. That is one important reason. The second reason is that as you are coming from a third country and want to apply for a residence permit as well as a working permit, it is essential to register. The national registration authority “LABO” in Berlin is only responsible for you once you are registered in Berlin. Your application cannot be processed without registration in Berlin.
The next very important reason for registration is: once you start your employment, your employer needs your tax id “steuerliche Identifikationsnummer” otherwise he is not able to do your monthly play slip. This tax id is organized by the municipality office once you are registered. After a few days your tax id will be sent to your address.
Lastly, if you want to apply for child benefit in Germany you need to be registered as well. You have to provide, in order to fill in the form, your name, address etc. you have to fill in your tax id as well.