UK Corporation Tax Calculator 2026/27 is a free web-based tool that calculates corporation tax for UK limited companies, including marginal relief for profits between £50,000 and £250,000. It provides the tax amount, effective rate, profit after tax, and a breakdown of the calculation. The tool also includes a scenario planner to compare up to three profit levels and a payment deadline calculator based on the accounting period end date. Updated for the 2026/27 tax year, it reflects current HMRC rates and thresholds.
What is the UK Corporation Tax Calculator?
This free tool from UK Creative Ventures calculates corporation tax for UK companies. You input your taxable profit, accounting period length, and number of associated companies; it outputs the corporation tax due, effective tax rate, and profit after tax. It runs entirely in the browser and requires no sign-up.
Key Features
- Marginal relief calculation — Automatically applies the HMRC marginal relief formula for profits between £50,000 and £250,000, showing the relief amount and effective rate.
- Scenario planner — Compare up to three different profit levels side-by-side, showing tax, effective rate, after-tax profit, and which band each falls into.
- Payment deadline calculator — Enter your accounting period end date and estimated profit to see your corporation tax payment and filing deadlines.
- Associated companies adjustment — Enter the number of associated companies to correctly divide the £50,000 and £250,000 thresholds.
- Accounting period flexibility — Choose between 12, 9, 6, or 3-month accounting periods.
- Educational content — Includes a detailed explanation of how corporation tax works, the three profit bands, and a worked example of marginal relief.
Who is it for?
- UK limited company directors — Calculate their company's corporation tax liability for the 2026/27 tax year.
- Accountants and tax advisors — Quickly compute tax for clients and demonstrate the impact of marginal relief.
- Business owners planning finances — Use the scenario planner to compare profit levels and plan salary vs dividend extraction.
What can you do with the UK Corporation Tax Calculator?
- Tax planning: Enter different profit scenarios to see how additional profit affects your tax bill, especially the 26.5% marginal rate within the relief band.
- Deadline management: Use the payment deadline tool to know exactly when your corporation tax is due and avoid late filing penalties.
- Group structuring: Adjust the associated companies count to see how thresholds change for groups of companies.
How does the UK Corporation Tax Calculator work?
Select your accounting period length, enter your taxable profit, and specify the number of associated companies. The calculator applies the current HMRC rates: 19% for profits up to £50,000, 25% for profits over £250,000, and marginal relief for profits in between. It displays the tax due, effective rate, and a visual band indicator. The scenario planner works similarly for up to three profit levels.
Pricing
The tool is completely free to use, with no sign-up required.
