Corporation Tax Calculator

UK Corporation Tax Calculator

Small, Marginal and Main Rate - Enter your Gross Profit and select the Tax Year - we'll automatically calculate your corporation tax and if your profits are above the small companies limit, any marginal relief applicable to you too!

Just select the Tax Year and enter your Gross Profit

Select Tax Year:
Company Profit (GROSS):

Corporation Tax Calculator 2025/2026

Updated for the 2025-2026 tax year.
Added 19% Corporation tax rate changes from 2017/18.
Big update for 2015! Small company rate and main rate are now unified at 20 percent. Marginal rate relief has been removed.
Updated for the 2013 tax year main rate reduction to 23% - Other changes to be confirmed.
Updated for the budget 2012 main rate reduction to 24% - Small Profits Rate remains at 20% - Changes made to marginal rate.
Updated for the new lower rates announced in the 2011 Budget - 26% Main Rate and 20% Small Profits Rate.
This calculator checks the Corporation Tax on the Gross Profit figure you provide.
All company sizes work - small or main rate - any marginal relief is applied for you.
If you find errors - let us know so we can fix them, email us at [email protected]

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