You won't get an island. The only doable course of action is to circumvent trade in the legal sense. So... you work, I give you something, but that's not payment, it may not even be a gift, officially, it could still be mine, I just let you use it henceforth. This way you can build up your own shadow society and pay no taxes, since there is no official income, nor are there official sales. Of course, when it comes to the executive branch, you'll only have one form of punishment, because nothing else will be feasible, namely capital punishment and your "police" would be in constant danger of being thrown into prison. Well, that didn't stop the people in Sicily, so it is doable, as I said.