UK Corporation Tax · FY2026 (1 Apr 2026 – 31 Mar 2027)
How much Corporation Tax will my company pay?
Put in your company's taxable profit for the year and see the bill worked out with the 2026/27 rates: the 19% small profits rate up to £50,000, the 25% main rate from £250,000, and Marginal Relief in between — including the 26.5% rate that quietly applies on profits inside the band. It runs entirely in your browser; nothing is sent anywhere.
Your company profit
Use your taxable total profits for the accounting period — turnover less allowable business expenses and capital allowances. This assumes one company with no associated companies and a full 12-month period.
How Corporation Tax works in 2026/27
Companies don't have a personal allowance or tax bands like individuals — Corporation Tax is charged on the whole taxable profit. Since 1 April 2023 there have been two rates, with a taper between them:
| Taxable profit | Rate |
|---|---|
| Up to £50,000 | 19% — small profits rate |
| £50,000 – £250,000 | 25% less Marginal Relief (26.5% on each extra £) |
| £250,000 or more | 25% — main rate |
Marginal Relief smooths the jump from 19% to 25%. It's worked out as 3 ÷ 200 × (£250,000 − your profit) and knocked off the main-rate bill. The catch: because the relief shrinks as profit rises, every extra £1 of profit between £50,000 and £250,000 is effectively taxed at 26.5% — higher than the 25% headline rate. Above £250,000 the whole profit is simply taxed at 25%.
The £50,000 and £250,000 limits are shared between associated companies and cut down for accounting periods shorter than 12 months, so a group of companies reaches the higher rates sooner. This calculator assumes a single company with a full-year period.
More free tools
Common questions
What is the Corporation Tax rate for 2026/27?
For the financial year starting 1 April 2026 the small profits rate is 19% on taxable profits up to £50,000 and the main rate is 25% on profits of £250,000 or more. Between those limits you pay the 25% main rate less Marginal Relief, which works out as an effective rate rising gradually from 19% to 25% across the band.
How does Marginal Relief work?
Marginal Relief reduces the main-rate bill for companies with profits between £50,000 and £250,000. It equals the standard fraction of 3 ÷ 200 multiplied by the difference between £250,000 and your profit, and is subtracted from 25% of your profit. For example, on £100,000 profit the main-rate tax is £25,000, less relief of 0.015 × £150,000 = £2,250, giving a bill of £22,750 — an effective rate of 22.75%.
Why is the marginal rate 26.5% and not 25%?
Inside the £50,000–£250,000 band the Marginal Relief shrinks as your profit grows, so each extra £1 of profit both adds 25p of main-rate tax and claws back 1.5p of relief. That makes the marginal rate on profit in this band 26.5% — higher than the 25% headline main rate. It's worth knowing before you decide whether to bring extra profit into the year.
What counts as taxable profit?
Corporation Tax is charged on your taxable total profits — broadly turnover and other income less allowable business expenses and capital allowances, plus any chargeable gains. It is not the same as the cash in your bank account or your turnover. Enter that adjusted profit figure, not your revenue, to get an accurate bill.
Do associated companies change the tax?
Yes. If your company has associated companies — broadly, companies under common control — the £50,000 and £250,000 limits are divided between them, so each reaches the 25% rate on a smaller profit. The limits are also reduced for accounting periods shorter than 12 months. This calculator assumes a single company with a full 12-month period.
When do I have to pay Corporation Tax?
For most small companies Corporation Tax is due nine months and one day after the end of your accounting period, and the company tax return (CT600) is due twelve months after the period end. Large companies with profits over £1.5m pay in quarterly instalments instead. Always confirm your own dates with HMRC.
Paid the company's tax — now work out your own
Corporation Tax is only half the picture. Once the company has paid it, you draw the profit as a small salary plus dividends — and that lands on your personal Self Assessment return, with its own Income Tax, dividend tax and payments on account. Our spreadsheet toolkit works out that personal bill and your true take-home in Excel or Google Sheets you own and keep.
- Self Assessment Tax Estimator 2026/27 — your personal bill on salary and dividends: income tax, dividend tax, payments on account and month-by-month set-aside.
- Freelance Day-Rate & Profit Calculator — work back from the take-home you want to the rate you need to charge.
- Rental Property ROI & Yield Calculator — for directors weighing personal versus company property ownership.
- Invoice Tracker & Log — auto paid/outstanding/overdue, with a chase list for the company.
Excel and Google Sheets. Working formulas, not just formatting. Built and checked by us, with AI assistance, and every calculation verified.
Get the Tax Estimator — £9 →£9 on its own, or all four tools for £19, with a 14-day money-back guarantee.