In this section:

Corporation Tax rates

Rates for financial years starting on 1 April
Rate 2011 2012 2013 2014
Small profits rate* 20%* 20%* 20%* 20%*
Small profits rate can be claimed by qualifying companies with profits at a rate not exceeding £300,000 £300,000 £300,000 £300,000
Marginal Relief Lower Limit £300,000 £300,000 £300,000 £300,000
Marginal Relief Upper Limit £1,500,000 £1,500,000 £1,500,000 £1,500,000
Standard fraction 3/200 1/100 3/400 1/400
Main rate of Corporation Tax* 26%* 24%* 23%* 21%*
Special rate for unit trusts and open-ended investment companies 20% 20% 20%* 20%*

Main rate of Corporation Tax

The main rate of Corporation Tax applies when profits (including ring fence profits) are at a rate exceeding £1,500,000, or where there is no claim to another rate, or where another rate does not apply.

From 1 April 2015 the small profits rate will be unified with the main rate, so there will be only one Corporation Tax rate for non-ring fence profits - set at 20%.

Ring fence companies

*For companies with ring fence profits (income and gains from oil extraction activities or oil rights in the UK and UK Continental Shelf) these rates differ. The small profits rate of tax on those profits is 19% and the ring fence fraction is 11/400 for financial years starting 1 April 2011, 2012, 2013 and 2014. The main rate is 30% for financial years starting on 1 April 2011, 2012, 2013 and 2014.

Corporation Tax on chargeable gains

Indexation Allowance allows for the effects of inflation when calculating the chargeable gains of companies or organisations.

Corporation Tax on chargeable gains: Indexation Allowance