When you're your own central bank, you don't really need to tax anything. If you need money you can just print it and tap into the existing liquidity streams.
Modern Monetary Theory on steroids.
For existing central banks, it works right up to the point when nobody wants their inflated fiat any more.
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Yes this is why taxes are still needed by them.
Taxes are what allow the money to give both value and act as a burn mechanism.
It actually makes sense but it comes at the cost of hurting groups of people. Taxes will become even more so the tool of control.