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Home › Calculators › Corporation tax
Updated for 2026/27Free · no sign-upCorporation Tax Calculator 2026/27
Work out your limited company corporation tax for 2026/27, including marginal relief, associated companies and short accounting periods.
Corporation tax due
£28,050
| Taxable profit | £120,000 |
| Rate applied | main rate with marginal relief |
| Marginal relief | £1,950 |
| Effective rate | 23.4% |
| Profit after tax | £91,950 |
Corporation tax is normally due 9 months and 1 day after the end of your accounting period. The CT600 return is due 12 months after.
How it works
How this calculator works
Companies with profits up to £50,000 pay the 19% small profits rate. Profits over £250,000 pay the 25% main rate. In between, you pay 25% reduced by marginal relief.
The £50,000 and £250,000 limits are divided by the number of associated companies plus one, and reduced for accounting periods shorter than 12 months.
Worked example
A Bolton company with £120,000 of taxable profit and no associated companies pays £28,050 corporation tax after £1,950 of marginal relief, an effective rate of 23.4%.
2026/27 rates
Rates and allowances used
| Small profits rate | 19% on profits up to £50,000 |
|---|---|
| Main rate | 25% on profits over £250,000 |
| Marginal relief | Between £50,000 and £250,000 (fraction 3/200) |
Rates for the financial year starting 1 April 2026.
FAQ
Corporation tax questions
What are the corporation tax rates for 2026/27?
The small profits rate is 19% for profits up to £50,000 and the main rate is 25% for profits over £250,000, with marginal relief in between.
What is marginal relief?
Marginal relief reduces the 25% rate for companies with profits between the lower and upper limits, so the effective rate rises gradually from 19% to 25%.
When is corporation tax due?
Payment is due 9 months and 1 day after the end of your accounting period. Very large companies pay in instalments.
What counts as an associated company?
Companies under common control, for example two companies owned by the same director, are associated. Each one reduces the profit limits.
Want an accountant to handle it?
Our ACCA and AAT qualified team in Bolton can take care of your Corporation Tax returns for a fixed fee.
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These results are estimates for guidance only, based on 2026/27 rates. They do not take into account every allowance or relief and are not financial advice. Speak to an accountant before making decisions.
