Most country didn't accept btc as a currency but I think there's no tax on bitcoin but you'll have to pay some tax if you'll going to exchange the fiat to btc or btc to fiat.
especially if you make withdraw for a big money, then it would make the bank company suspicious and ask you where you get those big money and maybe they will apply big tax for you but its not for your bitcoin. i really hope that government can not rule bitcoin and the user, but if we see on many aspect, there is always government wants to get involve no matter the way they still always wanted to get involved.