[usrusr]

> but the profits of any profitable trade are. Trades resulting in loss are ignored.

Kind of like lottery winnings are taxed where they are taxed. Or is there a country that not only taxes lottery wins but also makes lottery tickets a deductible expense?

[charlesdm]

It's an interpretation which might or might not be correct. If you are living in Finland and believe that this is incorrect, then you are free to go to court and make your case to a judge as to why the tax authority is wrong.