If you are living by your self in Himalayas or woods and not using or getting the benefit of any of the following perks then it's not theft.
1. You almost never get an itemization of what you received for your tax money, what each item cost, and how much of it you get for your money. This being the case, how do you even know that you received anything for your money? After all, with Quantum Easing, nobody would have to be taxed to pay for everything government supplies. Why not simply buy what you want? If you don't pay, you don't get to use it... like toll roads, for example... so that you can do a proper accounting.
2. "If you are living by your self in Himalayas or woods and not using or getting the benefit of any of the following perks," then you are being taxed by all of the work you have to do to so live. All that buying what you get is, is people specializing in an area, and getting paid for their specialized product or service. Why not government? so we can see where the money is going, and buy somewhere else if government can't keep their costs low enough?
Taxation is theft, but at least slavery.