UK Corporation Tax Calculator
Estimate UK Corporation Tax on company profit, including marginal relief between the small profits rate and the main rate.
Corporation Tax
£17,450.00
- Effective rate
- 21.81%
Assumptions
- Assumes a single standalone company — does not model associated companies, which reduce the thresholds proportionally
- Does not model franked investment income
How it's calculated
19% up to £50,000 profit, 25% above £250,000, with marginal relief tapering smoothly between the two.
Worked example
£80,000 in annual profit falls in the marginal relief band, shown live above.
Frequently asked questions
What if my company has associated companies?
The £50,000/£250,000 thresholds are divided among associated companies — not modeled here, since it depends on your specific group structure.