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=hf2fNEUPjQwIf you're working on a business you e able to pay taxes. In somehow bitcoin has only a transactions fee for transferring it. You don't need to pay taxes on bitcoin but you need to pay for a fee.