How it's worked out
Profits up to £50,000 are taxed at 19%. Above £250,000 the rate is 25%. In between, tax is charged at 25% and reduced by marginal relief:
3/200 × (upper limit − augmented profits) × taxable profits ÷ augmented profits
Augmented profits are taxable profits plus most dividends received from companies outside your group. Both limits are divided by the number of associated companies plus one, and cut in proportion if the accounting period is shorter than 12 months. Read more in our Corporation Tax guide.
Corporation Tax is due 9 months and 1 day after the end of the accounting period, and the CT600 return 12 months after it.
This calculator gives an estimate for general information. It isn't tax advice. Check the rules on GOV.UK or ask an accountant.
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