Mmh, in Belgium it is rather unclear what to do with the taxes. On one side they say if you did invest as a good dad, trying to protect the family funds, no taxes are required, on the other side if they can prove that you were trading to make a (fast) profit, they will claim 50% of the profit.
But were can we fill in the losses at the moment, can we deduct them from the taxes? Don't think so. The only reason the government wants to regulate things, is that they can have a share of the pie! The problem here in Belgium is that they already have more than half of my paycheck pie!