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The additional rate tax is the top rate of income tax for high earners in the UK.
In the 2019/2020 tax year, the additional rate is 45% on earnings above £150,000.
For example, if your annual income is £170,000, you’re an additional rate taxpayer, and you pay 45% tax on your income above £150,000. In this case, that’s 45% on £20,000: £9,000 in tax. For the rest of your income, you’ll pay tax at lower rates.
Also, if you’re in Scotland, the additional rate tax is actually 46% on earnings above the same £150,000 limit.