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 The UK had 91% tax from 1945 - 1963

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