Hi.
i didn't traded so much of my crypto for FIAT so i didn't dealt with that question yet.
however i think it's an issue need to be dealt with.
1. do you use accounting services?
2.if so, do you keep documentation of all traded or bought coins?
3. what do you do in cases of profit from ICO's
WHAT SHOULD I DO??
Earning profit from cryptocurrency is very simple by picking an exchanger and waiting for the drastic changes in the market in order to multiply your coins, the transaction fee's will compensate for the taxes and that is already considered for you to be legally earning profit.