Your company's tax bill and when to pay it
Enter your company's taxable profits to see the Corporation Tax and the dates it's due.
Your answer
Enter your company's taxable profits.
About this calculator
For limited companies in the UK, for one accounting period of up to 12 months.
What happens to your answers
We don’t keep them. Your answers go to our server to do the sums and aren’t stored or logged. If you copy a link to your answers, they’re in the link itself, so only share it with people you trust.
How it’s worked out
Profits up to £50,000 are taxed at 19% and profits over £250,000 at 25%. In between, the 25% rate is cut by marginal relief: 3/200 of the gap between your profits and £250,000. Both limits are divided by the number of associated companies plus one, and reduced for a period shorter than 12 months.
Tax is due 9 months and 1 day after the period ends, and the return 12 months after. Companies with profits over £1.5 million a year (divided the same way) pay in instalments instead.
Worked example
Your company's Corporation Tax is about £22,750, due by 1 January 2028.
12 months to 31 March 2027 · no associated companies · no dividends from other companies
| Taxable profits | £100,000 |
|---|---|
| Period: 1 April 2026 to 31 March 2027 (12 months) | |
| At the main rate, 25% | £25,000 |
| Less marginal relief: 3/200 × (£250,000 − £100,000) | − £2,250 |
| Corporation Tax | £22,750 |
Worked out using HMRC's Corporation Tax rates for financial year 2026 (years start on 1 April).
Questions people ask
What happens if we file late?
For returns due from 1 April 2026, it's £200 at once and another £200 at 3 months, then 10% of any unpaid tax at 6 months and again at 12. Late 3 times in a row, each £200 becomes £1,000.
What's an associated company?
Another company under the same control as yours, for example one you also own. Each one shares out the £50,000 and £250,000 limits, so more of your profit is taxed at the higher rate.
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