If you're US citizen as I know and coinbase and bittrex user if I'm not wrong both exchnage asking kyc and derictly reported to IRS all US citizen who have an bitcoin are subject to pay tax. So it's you can't ignore that regulation because US file to you an criminal case if ignore it.
Well, that is right. Well maybe if you are from the country of US you should be worried about it but in other countries, there is no need to worry about your tax report because the government has no control in crypto so you don't need to declare it to them. The only fee that you are going to pay is when you are going to withdraw your money from remittance and consider as a fee or tax for me. Luckily, here in my country reporting tax is not necessary when it comes crypto.