It depends on the law and regulations that you have in your local. Every country has its own regulations regarding cryptocurrency. Many countries doesn't have a clear regulation yet.
Yes it is really depends which country you belong with such lawful provisions to get paid taxes with your profit earned. Here in our country we've not forced to pay taxes because bitcoin users are not totally great in numbers but it started slowly growing right now, because people are aware the great benefit of bitcoin that helps elevate their financial stability.