Free Corporation Tax Calculator
Estimate your company's tax liability in seconds. We handle split financial years, marginal relief, and associated company thresholds automatically.
Calculate Your Corporation Tax
Enter your profit, accounting period and associated companies below to get an instant estimate of your Corporation Tax due.
Calculate Your Tax
Enter your company details to estimate corporation tax.
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Understanding UK Corporation Tax Rates
Here's a quick overview of the rates, relief and rules that affect how much Corporation Tax your company pays.
2023+ Tax Rates
From 1 April 2023, the main rate of Corporation Tax increased to 25% for companies with profits over £250,000. A small profits rate of 19% applies to companies with profits under £50,000.
Marginal Relief
If your profits fall between £50,000 and £250,000, Marginal Relief provides a gradual increase in your effective tax rate from 19% to 25%, easing the transition between the two bands.
Associated Companies
The £50,000 and £250,000 thresholds are divided by the total number of associated companies. This prevents businesses from splitting into multiple entities to stay within the lower tax band.