The UK had 91% tax from 1945 - 1963

https://www.wolterskluwer.com/en/expert-insights/whole-ball-of-tax-historical-income-tax-rates

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Didn't know that!

But it’s not normally 90% of everything.

It’s normally (for example):

First 12K - no tax,

next 13K - 20% tax

next 50K - 40% tax

next 50K - 50% tax

anything above that 90% tax