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Tax on shipping container from US
Here is the page on the Belgian customs site relating to moving to Belgium. However it seems that you may have left it too late. You normally have to move your stuff "duty free" within one year of arriving in Belgium.
http://fiscus.fgov.be/interfdanl/fr/citizens/demenager.htm
Your best bet would probably be to contact a moving / shipping company and ask them.
you are allowed a one-time shipment of personal goods without paying duty or taxes. If you have already shipped stuff over when you first arrived, you will have to pay for second shipment.