But what I'm saying is, when the Government tax people, they don't burn the money, they redistribute the money (e.g. to public sector workers). So whatever trend you might see with one person in terms of how they spend their money, it will be the same with another person to whom the money is transferred. So leveraging taxes on individuals (unlike companies) rarely has negative effects on economic growth. Also, governments normally factor in the effect that these tax cuts have on the economy and factor in potential economic growth into their calculations when they determine the effect that the tax cut has on national income - and more often than not, as long as there is no deferral effect, they calculate it will cost the treasury.
That's not how the economics works. If you take the money out of circulation via tax into the big pot, you're taxing it just the once. If you allow it to be spent, you are taxing it on every single transaction that is made, and then on the subsequent earnings. Now, this isn't an absolute of course, because the government itself can act as a primer for economic growth, but the state isn't remotely as efficient at that as the private sector is. This is rather a separate issue as to whether that money is better spent by the state, because you can of course make the argument that the social dimension is more important, it's just about how the circulation of money works, and why it is that lowering tax can generate higher tax receipts. In an ideal world, when you are in recession is the best time to cut taxes, because it promotes economic growth that's badly needed in such circumstances, but it is of course practically impossible for a government to do that because they need the revenue so badly.