I ran across this video a while ago on what can happen to you if you don't pay your taxes. At some point during your Bitcoin career, the cryptocoin will be converted to fiat and that's how they will catch you.
https://www.youtube.com/watch?v=hf2fNEUPjQwActually we are paying electricity bills while we are running our mining hardwares and if you are transferring your coins then you also need to pay your transaction fee's so taxes are just bullshit and government just want to get money from people.