I'm a Norwegian citizen, and am considering spending extended periods of time in Germany, potentially to the point of being a resident for some or all of a tax year. I currently live outside the EEA in a country with a tax treaty with Germany.
I understand the need to register as a resident should I spend significant amounts of time there. However, it is also possible to register as a resident before it is required.
What are my obligations should I register as a resident in Germany? The main one is likely to be dealing with tax; are there others?