The rate of Corporation Tax you pay depends on how much profit your company makes.

There are different rates for ring fence companies

Rate 2016 2015 2014 2013
Small profits rate
(companies with profits under £300,000)
20% 20%
Main rate
(companies with profits over £300,000)
21% 23%
Main rate (all profits except ring fence profits) 20% 20%
Marginal Relief lower limit £300,000 £300,000
Marginal Relief upper limit £1,500,000 £1,500,000
Standard fraction 1/400 3/400
Special rate for unit trusts and open-ended
investment companies
20% 20% 20% 20%

From 1 April 2015 there is a single Corporation Tax rate of 20% for non-ring fence profits.

Use the Marginal Relief calculator to work out how much Marginal Relief you can claim on your Corporation Tax for profits before 1 April 2015.

At Summer Budget 2015, the government announced legislation setting the Corporation Tax main rate (for all profits except ring fence profits) at 19% for the years starting the 1 April 2017, 2018 and 2019 and at 18% for the year starting 1 April 2020. At Budget 2016, the government announced a further reduction to the Corporation Tax main rate (for all profits except ring fence profits) for the year starting 1 April 2020, setting the rate at 17%.