Can I structure my company setup to be legit to any authority (but still avoid tax) if my backend is a offshore company in Belize, BVI, Seychelles, Panama etc. ? How would you go about it?
It depends a lot on where you live and what laws are applicable. Most likely you cannot avoid tax completely (at least not if you want to take out some form of income), but you may be able to minimize tax. You need to check this with a lawyer or qualified accountant.