Corporation Tax Calculator (UK 2024)
After allowable deductions
UK Corporation Tax: 19% (profits <£50K) · Marginal relief (£50K–£250K) · 25% (profits >£250K)
Corporation Tax (CT) is charged on the taxable profits of limited companies trading in the UK. From April 2023, the UK introduced a new two-rate system: 19% for small profits and 25% for large profits, with marginal relief for profits between £50,000 and £250,000.
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Tip: Capital allowances (Full Expensing since April 2023) allow 100% first-year deductions for qualifying plant and machinery — significantly reducing taxable profits in investment-heavy years.
- 1Small profits rate: 19% on profits up to £50,000
- 2Main rate: 25% on profits above £250,000
- 3Marginal relief applies between £50,000 and £250,000 — effective rate between 19% and 25%
- 4Marginal relief formula: MR = (upper limit − profit) × (upper − lower) / upper × (main rate − small rate)
- 5CT return must be filed within 12 months of year end; CT paid within 9 months
£40,000 profit=CT = £7,600 (19%)Small profits rate — straightforward
£150,000 profit=CT = ~£32,750 (effective 21.8%)Marginal relief applies between £50K and £250K
£400,000 profit=CT = £100,000 (25%)Full main rate — no marginal relief
| Profit Level | Rate Applied | Notes |
|---|---|---|
| Up to £50,000 | 19% | Small profits rate |
| £50,001 – £249,999 | 19–25% (marginal) | Marginal relief reduces effective rate |
| £250,000+ | 25% | Main rate — no relief |
| Associated companies | Divide limits | Limits divided by number of related companies |
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