Corporation Tax Calculator
Our Corporation Tax Calculator helps you estimate your company’s Corporation Tax liability based on its taxable profits.
At CAIL, our free online calculator provides a quick and convenient way to estimate how much Corporation Tax your company may need to pay. Simply enter your company’s profits and other relevant details to get an estimated Corporation Tax liability.
Corporation Tax In the UK?
Corporation Tax is a tax on the taxable profits of companies and certain other organisations. The amount your company pays depends on its taxable profits and the Corporation Tax rules that apply to its accounting period.
For the 2026/27 financial year, the main Corporation Tax rates are:
- 19% for profits of £50,000 or less
- 25% for profits over £250,000
- Marginal Relief for profits between £50,000 and £250,000
The £50,000 and £250,000 thresholds can be reduced if your company has associated companies or an accounting period shorter than 12 months.
Disclaimer: The rates mentioned above are based on the 2026/27 tax year. Tax rates and thresholds may change, so check the latest guidance before relying on these figures.
Corporation Tax Calculation Example
If a company has £40,000 of taxable profits and the 19% small profits rate applies:
£40,000 × 19% = £7,600 Corporation Tax
This would leave the company with £32,400 after Corporation Tax, before considering any other payments or adjustments.
Note that if taxable profits fall between £50,000 and £250,000, the calculation is more complex because Marginal Relief may apply rather than simply applying 25% to the entire profit.
How Does the Corporation Tax Calculator Work?
Here is how our calculator works:
Enter Your Company Profit
Enter your estimated accounting profit before Corporation Tax.
Add Allowable Expenses and Adjustments
Enter relevant expenses and adjustments to help estimate your taxable profit.
Select Your Accounting Period
Enter the relevant accounting period, as this can affect the Corporation Tax calculation and applicable rates.
View Your Results
The calculator estimates your taxable profit, applicable Corporation Tax rate, estimated Corporation Tax liability and, where supported, your estimated profit after tax.
Why Use Our Corporation Tax Calculator?
Our Corporation Tax Calculator makes it easier to estimate your company’s potential tax liability. It can help you:
- Estimate your Corporation Tax based on your taxable profits.
- Understand your potential tax bill before preparing your Company Tax Return.
- See how Corporation Tax rates may affect your profits.
- Plan your company’s finances more effectively.
- Get a quick estimate without doing complex calculations manually.
Get Help With Corporation Tax
Our Corporation Tax Calculator is a useful starting point for estimating your company’s tax liability, but calculating Corporation Tax can become more complicated when your business has losses, associated companies, capital allowances or other tax reliefs.
Cheap Accountants can help you calculate your Corporation Tax, prepare your Company Tax Return and meet your Corporation Tax obligations. Contact us if you need professional help with your company’s accounts and tax.
Frequently Asked Questions
What is a Corporation Tax Calculator UK?
A Corporation Tax Calculator is a tool that helps estimate how much Corporation Tax a company may need to pay based on its taxable profits and other relevant information.
Is Corporation Tax calculated on turnover or profit?
Corporation Tax is generally calculated on a company’s taxable profits, not its turnover. Taxable profits are worked out after applying relevant expenses, allowances, losses and other tax adjustments.
What is Marginal Relief?
Marginal Relief can reduce the Corporation Tax payable by companies with taxable profits between £50,000 and £250,000. It provides a gradual increase in the effective Corporation Tax rate between the small profits rate and the main rate.
Can expenses reduce Corporation Tax?
Allowable business expenses can reduce the profits on which Corporation Tax is calculated. However, not every business expense is deductible for Corporation Tax purposes.
When does a company pay Corporation Tax?
The payment deadline depends on the company’s accounting period and circumstances. Most companies that are not large companies generally pay Corporation Tax 9 months and 1 day after the end of their accounting period.
Is the Corporation Tax Calculator accurate?
The calculator provides an estimate based on the information entered. Your actual Corporation Tax liability may differ because of tax adjustments, allowances, reliefs, losses, and other company-specific circumstances.
Does the Corporation Tax Calculator include all tax reliefs?
Not necessarily. The calculator provides an estimate and may not account for every allowance, relief, loss, or tax adjustment that could affect your company’s final Corporation Tax liability.
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