> "Taxation doesn't change inflation, to the best of my knowledge, as before and after taxation the same amount of money exists in the circulating supply. Taxation is fiscal policy."
Fiscal policy affects inflation. You're thinking of inflation as "the money supply / total of all $", but that's only one definition or part of inflation. Generally, you would also describe inflation as the price of things you buy going up or down (CPI). Say you ratchet up the effective tax rate to 90%. Everyone's going to have a whole lot less money to buy extra things. Some things with fixed raw input cost still wouldn't budge much. However now that people's monthly incomes have gone from $5000 -> $1000, you're going to see houses, education, Pelotons, and other extra income sinks, have their prices fall precipitously.
Fiscal policy affects inflation. You're thinking of inflation as "the money supply / total of all $", but that's only one definition or part of inflation. Generally, you would also describe inflation as the price of things you buy going up or down (CPI). Say you ratchet up the effective tax rate to 90%. Everyone's going to have a whole lot less money to buy extra things. Some things with fixed raw input cost still wouldn't budge much. However now that people's monthly incomes have gone from $5000 -> $1000, you're going to see houses, education, Pelotons, and other extra income sinks, have their prices fall precipitously.