Corporation tax, worked out in seconds
Corporation tax is 12.5% on Irish trading profits, 15% in Gibraltar, and in the UK 19% up to £50,000 of profit and 25% above £250,000, with Marginal Relief between the two. Enter your profit below to see an estimate with the working shown.
After allowable expenses and capital allowances
Associated companies
Period length (months)
Estimated corporation tax
£22,750
- Profit after tax
- £77,250
- Tax per £100 of profit
- £22.75
How it is worked out
- Main rate: £100,000 × 25% = £25,000
- Marginal Relief: (£250,000 − £100,000) × 3/200 = £2,250
- Tax due: £25,000 − £2,250 = £22,750
Limits used: £50,000 and £250,000, after sharing between 1 associated company over a 12-month period. Assumes no exempt distributions are received.
How it’s worked out
The rules behind the figure, one country at a time.
Trading income is taxed at 12.5%. Non-trading income such as rent and most interest is taxed at 25%. Close company surcharges on undistributed investment income are not included in this estimate.
Frequently Asked Questions
Written and maintained by the Shiel Accountants team. Last updated .
Is this calculator accurate enough to file with?
No. It is an estimate based on the headline rules. Losses, reliefs, capital allowances and group positions can all change the figure, so the final computation should always be prepared from your accounts.
What profit figure should I enter?
Taxable profit, which is your accounting profit adjusted for items that are not deductible, such as entertainment and depreciation, and after capital allowances.
Why is the UK marginal rate higher than 25%?
Inside the Marginal Relief band each extra pound is effectively taxed at 26.5%, because the relief shrinks as profit rises. The average rate still stays between 19% and 25%.
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