Originally posted by Cliphead
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History of taxation in the United Kingdom: From the Second World War
In 1971 the top rate of income tax on earned income was cut to 75%. A surcharge of 15% kept the top rate on investment income at 90%. In 1974 the cut was partly reversed and the top rate on earned income was raised to 83%. With the investment income surcharge this raised the top rate on investment income to 98%, the highest permanent rate since the war. This applied to incomes over £20,000 (£155,247 as of 2013),[5]. In 1974 750,000 people were liable to pay the top-rate of income tax.

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