The marginal rate of Corporation Tax

The Corporation Tax Main Rate applies to companies with profits in excess of £250,000. The applicable rate is currently 25%. A Small Profit Rate (SPR) of 19% applies to companies with profits of up to £50,000.

Where a company has profits between £50,000 and £250,000 a marginal rate of Corporation Tax applies that bridges the gap between the lower and upper limits. The lower and upper limits are proportionately reduced for short accounting periods of less than 12 months and where there are associated companies.

The effect of marginal relief is that the effective rate of Corporation Tax gradually increases from 19% where profits exceed £50,000 to 25% where profits are more than £250,000.

The amount of Corporation Tax to pay will be found by multiplying your profits by the main rate of 25% and deducting marginal relief. For the current 2024 fiscal year, the marginal relief fraction is 3/200. HMRC also has an online calculator that can be used to calculate marginal relief on Corporation Tax profits. The calculator can be found at www.tax.service.gov.uk/marginal-relief-calculator