I personally did not really know it yet, and have never found one article I read how the application of tax on bitcoin that has been applied in certain countries. in a country where I live hasn't really legalize bitcoin itself, and there is no such thing as a tax payment on bitcoin, it's still free of tax. But I think it's good.. although bitcoin is still not legal in the country where we live, we can still pay taxes from bitcoin earnings that we get in the form of cash. Surely we must be a good citizens for the country, and still pay taxes as can possible.