The idea makes no sense. Taxation is necessary for government, laws, infrastructure, defense, etc. to exist, and these things are necessary to have a civilization. If it weren't for this, you couldn't work at your job and make money. There would be no companies, workforce, economy or cornucopia. All these things depend on the enforcement of legal contracts, among other functions of government.

Let's say there were no legal contracts, and somehow there were a company you could work for (there really wouldn't be), and you worked for the month, and then they simply decided not to pay you. What are you going to do, sue them? Or maybe they'd just enslave you instead of hiring you. And what's to stop companies from raiding other companies and killing everybody in them to eliminate competition? Heck, why would someone even run a company, or work for a company, when they can just rob people instead? You wouldn't be safe from being robbed, raped, etc. just leaving your house--er, I mean, hut--or probably not while inside it either.

That's just a couple of examples out of endless problems, which ignore that companies or any other organized, mass coordination/cooperation couldn't really exist in the first place for systemic reasons.

So, if you can't make any money without taxes, nor buy a new TV and pay for electricity, water, internet, etc. even if you could make money, then what does it really mean to say that taxation is theft? What are they taking from you, something you wouldn't have had in the first place? And aren't you a fan of the affordances of civilization, technology, safety and the supply chain?

People who say taxation is theft really haven't thought this through and have zero understanding of how society works. They're just idealistic hyper-individualists.