Until Governments start calling bitcoin currency, it cannot be taxed.
IF BTC could be taxed, you could simply not report it, because it is anonymous enough to just NOT report. lol
You could mine it, and not report it. Easy. Give me a break.
It is assumed that one of the main advantages of obtaining and paying with BTC is anonymity and skip the payment of taxes. It would not make much sense, although if for a country