Unfortunately, in my country you still have to pay taxes when you are cashing out your coins and also you cannot cash them all out you can only do in in a limit this way you have to pay a lot of taxes if you want to cash everything out.
That is, if you are going through the legal route. There are thousands of options out there to avoid taxes and it is up to you whether to use these methods or not. For example, you can order pre-paid Bitcoin debit cards from various service providers and withdraw fiat cash from the ATMs.
I agree that there's a lot of options to do that, but the idea about that it will kill the income tax is not certain at all. That's why it should be categorize that fiat must be taxable and digital type of currency is not.