UK Corporation Tax Calculator
Estimate a UK company's corporation tax liability based on taxable profits and the applicable corporation tax rate. Includes links to HMRC guidance and notes on common UK-specific reliefs.
- Page updated:
- Jan 3, 2026
- Tool version:
- v1.1.0
Overview
This calculator provides a concise estimate of UK corporation tax liability based on taxable profits and an input tax rate. It is intended for quick scenario analysis and does not replace professional advice.
Results
Estimated corporation tax liability
$25,000.00
Effective tax rate
0.25
How to read the result
- What it means
- The displayed value is an estimate based on your inputs. It represents the calculated scenario under current assumptions, not a guaranteed amount.
- Calculation limits
- The model uses simplified formulas and cannot account for all variables in your specific case (local regulations, personal conditions, temporal changes).
- Next step
- Use the result as a starting point. Adjust parameters to compare scenarios and validate with a professional when needed.
Glossary+−
- Taxable profits
Company profits for tax purposes after allowable deductions and capital allowances.
- Corporation tax rate
The percentage applied to taxable profits to calculate corporation tax due.
- Marginal relief
A mechanism that eases the transition between small profits rate and main rate for profits within a specified range; rules and tables are provided by HMRC.
Key takeaways
Use this calculator for quick estimates of corporation tax liability in GBP. For complex cases (marginal relief, group relief, R&D claims, capital allowances) use HMRC guidance or professional advice.
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Worked examples
Example 1: Typical limited company (simple)
A company has taxable profits of £200,000 and uses the main corporation tax rate of 25%.
Interpretation
Estimated corporation tax liability is £50,000.
Example 2: Small profit scenario (illustrative)
A company with taxable profits of £30,000 using a lower small profits rate (if applicable). This is illustrative — check HMRC for thresholds and marginal relief details.
Interpretation
Estimated corporation tax liability is £5,700. Confirm small profits rate and thresholds with HMRC.
Frequently asked questions
Is this calculator definitive legal or tax advice?
No. This tool gives an estimate for planning purposes only. For formal tax positions, refer to HMRC guidance or a qualified tax adviser.
Where do the tax rates come from?
Default rates are set to reflect UK corporation tax rules as of the last updated date. Always confirm current rates and thresholds on GOV.UK/HMRC.
How should I treat losses, R&D or group reliefs?
These features affect taxable profits before applying the corporation tax rate. The calculator does not compute detailed reliefs; adjust taxable profits manually or consult a specialist for precise treatment.
How often is this tool updated?
Metadata includes the lastUpdated date. We review and update content when UK tax rules or rates change materially.
Sources & references
- HM Revenue & Customs - Corporation Tax: https://www.gov.uk/topic/business-tax/corporation-tax
- GOV.UK - Corporation tax rates and reliefs: https://www.gov.uk/corporation-tax-rates
Quality & oversight
- Author
- Ugo Candido, MBA
- Maintained by
- Ugo Candido, MBA
- Page updated
- Jan 3, 2026
- Tool version
- v1.1.0