January 29, 2009 5:28:06 AM CET
I'm not quite sure what you're really asking, Bernie, because your post omits a lot of pertinent information.
You talk about 'Obtaining Belgian Nationality witin a few months'... yet you decline to mention your current nationality.
Why?
If you're an EU citizen (any member state) then you can work in any other member state without restriction. - Free movement of Persons, a basic right of the EU.
If you are a national of a non-EU MS and you have a right to work in one MS, then - although there is (AFAIR) no EU directive which requires Member States to accept work permits from other Member States, there is a 'general assumption' (should that be a 'general optimism'?) that other member states will accept the work permits of their neighbours.
You probably are going to be snowed under with 'red tape', but imo, most bureaucrats are lazy.
If you approach tme and say "Can I do so-and-so?" the answer will almost inevitably be "No"- Not because you can't, but because it's easier to say "No."
Were I to try to give you the 'best' advice, then I would be obliged to advise you to seek advice from a German Steuerberater and from a Belgian tax advisor. Sound advice.
You could, however, go to them and tell them what you want to do and ask them whether it's acceptable, or if not, why not.
It's easier to say 'yes' to something which sounds reasonable than it is to provide a structured argument which denies the request.
I'm not advising you - I am not qualified to do so (and anyway, you're not paying me

)
If in doubt, seek professional advice.