Good point. However a government cannot simply make up money. So either way you'll pay for, if not before it'll be after.You seem to be under the impression that taxes fund spending. That's largely true in the Eurozone where governments are enslaved to the commercial banks and must collect money in order to spend, not true in the UK as we are a sovereign currency issuer who spends first, and possibly collects later, or not (£1.8tn and counting!)
Tax income may not directly fund spending on paper, but it sure does incentivise it, whatever they say.