The highest rate of income tax peaked in the Second World War at 99.25%. It was slightly reduced after the war and was around 97.5% (nineteen shillings and sixpence in the pound) through the 1950s and 60s.[
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In 1971 the top-rate of income tax on earned income was cut to 75%. A surcharge of 15% on investment income kept the top rate on that income at 90%. In 1974 this cut was partly reversed, and the top rate on earned income 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 (£186,150 in 2016 terms),
[3]. In 1974, as many as 750,000 people were liable to pay the top-rate of income tax.
[7] Margaret Thatcher, who favoured indirect taxation, reduced personal income tax rates during the 1980s.
[8] In the first budget after her election victory in 1979, the top rate was reduced from 83% to 60% and the basic rate from 33% to 30%.
[9] The basic rate was also cut for three successive budgets - to 29% in the 1986 budget, 27% in 1987 and to 25% in 1988.
[10] The top rate of income tax was cut to 40% in the 1988 budget.The investment income surcharge was abolished in 1985.