Corporation Tax Calculator 2026/27
Calculate how much corporation tax your limited company owes based on your annual profits.
Your company details
Profit after allowable expenses and capital allowances
Deducted from your CT bill
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Results are estimates only and do not constitute financial advice.
Corporation tax at common profit levels — 2026/27
Click any row to load it into the calculator above.
| Annual profit | CT due | Effective rate | After tax |
|---|
How it's calculated
Small profits rate of 19% applies if your profits are £50,000 or less.
Main rate of 25% applies if your profits are £250,000 or more.
Between those thresholds, marginal relief applies. Tax is charged at the main rate, then reduced by: (£250,000 - profits) × 3/200.
The lower (£50,000) and upper (£250,000) limits are reduced if your company has associated companies, or if the accounting period is shorter than 12 months.
Frequently asked questions
9 months and 1 day after your accounting period ends. The CT600 return is due 12 months after the period end.
A reduction that smooths the jump from 19% to 25%. Applies to profits between £50,001 and £250,000.
Not legally required, but most limited companies use one. The savings usually exceed the fees.