Right now, whether Bitcoin is taxed really depends on the country where you live. I think that Bitcoin itself shouldn't be subject to taxes, but that the income from trading or just getting BTC as a salary should be reasonably taxed in a way that's similar to fiat income taxes. So it shouldn't be anything crazy because then people will just hide it, and the procedure of filing taxes should also be as simple as possible. I think such conditions would move a lot out of the gray area, and it can be beneficial to countries economies.