@Ric *****
I probably can't keep my registration address in Germany, as I would have my centre of life in Thailand. In this respect, it would not be legally permitted to have a registration address in Germany if it is not the centre of my life.
However, I would have no problem paying taxes in Thailand, but it is a completely open question as to what would change for my employer in Germany in terms of payroll accounting. He is worried about formalities and expense. Is he even allowed to deduct income tax as before if Thailand has the right of taxation? What about social security contributions?