UK Corporation Tax Calculator
Enter your company profits and get an instant estimate using the current official rates (2026/27, unchanged since April 2023).
12 normally. Shorter for a first period or a change of year-end.
Other companies under common control — thresholds are shared equally between them.
This calculator is an illustrative estimate using current UK corporation tax rates (2026/27, unchanged since April 2023). It does not account for capital allowances, company losses, franked investment income, or the detailed "associated company" definition. For your actual tax liability, consult a qualified accountant.
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Get a free quoteHow UK corporation tax works
Corporation Tax (CT) is a tax on UK company profits. It is reported via form CT600 and must be paid within 9 months and 1 day of the end of the company's accounting period.
Since April 2023, the flat 19% rate no longer applies to all companies. Companies with lower profits pay 19%, those with higher profits pay 25%, and those in between benefit from marginal relief that tapers the transition between the two rates.
Marginal relief means the effective marginal rate for companies with profits between £50,000 and £250,000 is 26.5% on each extra pound. This makes tax planning particularly valuable in this range.