You will have come across income tax and social security, having paid it on your earnings and on the income from your investments. If you have bought property, you will have paid registration tax. For estate planning purposes you may want to understand gift tax and inheritance tax. 

Belgian taxes can be quite high.  Saying that Belgium is a tax haven sounds cynical.  However it can be for those that already have assets. There is no wealth tax and there is no capital gains tax, that is if you are careful to avoid the pitfalls. 

Belgium can be a good place to take up your pension as well, without any limitations.  

                                                       . . .