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.
What a Corporation Tax estimate does not include
A company’s tax position depends on more than its headline profit. Capital allowances, losses, associated companies, accounting periods, dividends and other adjustments can all be relevant to the final calculation.
Use this estimate to start a discussion about your expected profit and likely tax bill. Your statutory accounts and Corporation Tax return need to use the correct accounting records and current rules for the company’s specific circumstances.
Plan for the payment date
Corporation Tax is normally due nine months and one day after the end of the accounting period. Keeping a current estimate helps a business plan its cash flow and avoid last-minute surprises.