Tax law is dependent on your country and locality. Recently in the United States, the IRS has declared that Bitcoin is to be treated as property, not currency, for tax purposes. All income in the US is taxed, regardless of what form it takes. If youre paid in bitcoins, youre supposed to pay taxes on your earnings at the BTC/USD exchange rate when you receive payment.
Is it a good decision or bad?
With the tax imposed on Bitcoin, the state indirectly recognizes bitcoin and is not an illegal item, about the bitcoin tax which is usually subject to buying and selling taxes or property taxes, but in my opinion the tax that will be worn is a positive thing, it is for obedient people law.