Free calculator · 2026/27
Corporation tax calculator for UK companies.
Calculate your company’s corporation tax using the 19% small profits rate, 25% main rate and marginal relief for profits in between.
- Updated for 2026/27 rates
- Free, no sign-up
- Instant results
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Tax year
2026/27
Rates last reviewed November 2026
Open the calculator ↓Free · No sign-up · Estimates only
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Corporation tax rates
Profits up to £50,000 are taxed at 19% and profits over £250,000 at 25%. In between, marginal relief gives a gradual increase. Associated companies share the limits.
When corporation tax is due
Most companies pay 9 months and 1 day after the end of the accounting period, and file the CT600 within 12 months.
Worked example
See it with real numbers
A company with taxable profit of £120,000 pays £28,050 of corporation tax, an effective rate of about 23.4%, after marginal relief.
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Accounts and Corporation Tax return from £249 + VAT.
FAQs
Corporation Tax Calculator: your questions answered
Short, straight answers. Still unsure? Call us on 020 3441 1258.
19% on profits up to £50,000 and 25% above £250,000, with marginal relief in between.
A reduction that smooths the move from 19% to 25% for profits between £50,000 and £250,000.
Companies under common control. They share the profit limits.
Yes, with your accounts from £249 + VAT.
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Prices last reviewed November 2026. Cheap Accountants in London is a trading style of ACCOTAX London Ltd.