Tax calculator
Corporation Tax calculator
Get a simplified estimate for a standard 12-month accounting period.
Helpful tool
Estimate Corporation Tax.
A simplified estimate using the 2026 small profits rate, main rate and marginal relief thresholds.
Estimated Corporation Tax
This is an illustration only. It does not account for losses, capital allowances, reliefs or special Corporation Tax status. Use HMRC’s Marginal Relief calculator for an official calculation.