Corporation Tax Calculator (UK 2024)
After allowable deductions
UK Corporation Tax: 19% (profits <£50K) · Marginal relief (£50K–£250K) · 25% (profits >£250K)
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What is Corporation Tax Calculator?
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Imagine running a bustling local coffee shop or a thriving freelance design studio. At the end of a successful year, you look at your bank account and see a healthy profit. It is an amazing feeling! But before you start planning how to reinvest that cash or reward yourself, there is one major guest you need to invite to the party: HMRC. Corporation Tax is the bill every UK limited company must pay on its taxable profits. It is not just a simple flat fee, and getting it wrong can cause a real headache for your cash flow when the tax bill finally lands on your desk. That is where our Corporation Tax Calculator steps in to save the day. Think of it as a friendly financial radar that helps you spot your upcoming tax bill from a mile away. Instead of waiting for your accountant to deliver the news months after your financial year ends, you can get a quick, accurate estimate whenever you want. This lets you make smart decisions in real-time, like deciding whether you can afford to buy new equipment, hire help, or pay yourself a dividend. The UK tax system is a bit like a tiered energy bill. If your profits are under £50,000, you pay the lower 'Small Profits' rate of 19%. If you cross over £250,000, you jump to the 'Main Rate' of 25%. But what if you are happily sitting somewhere in the middle? That is where things get tricky because of something called 'Marginal Relief'—a sliding scale that bridges the gap so you do not face a sudden, painful tax cliff. Our calculator does all this heavy lifting for you, giving you a clear, stress-free picture of what to set aside.
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Formulė
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Our basic UK Corporation Tax estimation formula for the financial year starting 1 April 2026 is: tax = taxable profits x rate. Here, the small profits rate is 19% for profits up to £50,000, the main rate is 25% for profits above £250,000, and profits sitting between these two benchmarks are eligible for Marginal Relief. For non-ring-fence profits, the Marginal Relief is calculated as: Marginal Relief = (Upper Limit - Augmented Profits) x Taxable Profits x 3 / (200 x Upper Limit), and the final tax after applying relief is: Taxable Profits x 25% - Marginal Relief. For example, if your business has £100,000 in taxable profits with no associated companies, the relief is calculated as (£250,000 - £100,000) x £100,000 x 3 / (200 x £250,000) = £900. Your final estimated tax bill becomes £25,000 - £900 = £24,100.Variable Legend
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| Symbol | Vardas | Vienetas | Aprašymas |
|---|---|---|---|
| TP | Taxable profits | — | This represents your company's actual profits that are subject to tax, calculated after subtracting all your business expenses and tax allowances. |
| UL | Upper limit | — | The upper threshold for Marginal Relief, which starts at £250,000 but gets divided if you have associated companies or a shorter tax year. |
| AP | Augmented profits | — | This is your total taxable profit plus any tax-free dividends your company received from other non-group businesses. |
| MR | Marginal Relief | — | A helpful tax discount that softens the blow as your profits transition from the lower 19% rate up to the 25% main rate. |
| 3/200 | Standard fraction | — | The official mathematical fraction set by HMRC to calculate the exact amount of tax relief you are entitled to. |
How to Corporation Tax Calculator
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- 1Grab your taxable profit figure. Remember, this is your business income minus tax-allowable expenses, which can be slightly different from the basic profit on your bookkeeping software.
- 2Tell us if you have any associated companies. If you run multiple businesses under shared control, HMRC asks us to share the tax thresholds between them, so we'll need to know!
- 3Enter the length of your accounting period. If you've been trading for a full 12 months, you're good to go. If it's a shorter first year, we'll automatically adjust the goalposts for you.
- 4Let our calculator do the math. It will automatically check which tax band you fall into and apply the correct 19% or 25% rate, or calculate your custom Marginal Relief if you're in the middle.
- 5Factor in any extra reliefs. Use this estimated figure as your starting point, then chat with your accountant about any final deductions like research grants or capital allowances.
- 6Set aside your tax savings. Now that you have a reliable estimate, you can confidently move that cash into a separate business savings account and sleep easy.
Worked Examples
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£40,000 x 19% = £7,600.
Meet Sarah, a freelance graphic designer running her own limited company. Since her annual taxable profits are £40,000, she sits comfortably below the £50,000 lower threshold. This keeps her tax calculation beautifully simple, applying the flat 19% Small Profits Rate with no extra relief calculations needed.
Tax at 25% is £25,000, less £900 Marginal Relief.
Let's look at a local digital marketing agency that cleared £100,000 this year. Because their profits fall between the £50,000 and £250,000 brackets, they don't pay a flat rate. Instead, they get a helpful £900 Marginal Relief discount, bringing their actual tax bill down to £24,100.
Profits above £250,000 generally pay the main rate.
An online retailer had an incredible year, bringing in £300,000 in taxable profits. Since this is well past the £250,000 upper limit, their tax calculation is straightforward again. They pay the standard 25% main rate on their total profits, which equals £75,000.
Thresholds are halved to £25,000 and £125,000, so Marginal Relief is smaller.
James runs two separate active companies. Because of this, HMRC splits his tax thresholds in half. For this company making £90,000, the lower limit drops to £25,000 and the upper limit drops to £125,000. This pushes him further into the Marginal Relief zone, resulting in an estimated tax bill of £22,122.
Short periods need adjusted limits before the tax estimate is trusted.
Imagine you launched a new consulting business and decided to align your first tax year to a 6-month period, earning £60,000. Because your tax year is cut in half, HMRC also cuts your thresholds in half (£25,000 and £125,000). The calculator adjusts these limits first to make sure your tax estimate is perfectly accurate.
Real-World Applications
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Setting aside the perfect amount of cash in a separate business savings account each month so there are no scary surprises at tax time.
Running quick 'what-if' scenarios to see how buying new company vehicles or office gear will lower your overall tax bill.
Working out how much profit is left over to safely distribute to shareholders as dividends after tax is accounted for.
Drafting realistic annual budgets and cash-flow forecasts to show potential investors or bank managers.
Special Cases
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Associated companies
If you control more than one active company, HMRC requires you to split your tax thresholds evenly among them. For example, if you run two companies, your lower £50,000 limit drops to £25,000 for each, which can push your businesses into higher tax brackets much sooner.
Short accounting periods
Starting a new business or changing your year-end date often results in a tax period shorter than 12 months. In these cases, your £50,000 and £250,000 thresholds must be scaled down proportionally to match the exact number of days you traded.
Periods spanning 31 March
When tax rates or rules change on April 1st, and your company's financial year runs through that date, your profits have to be split. The calculator helps apportion your profits by day so the correct rates apply to each portion of your business year.
UK Corporation Tax Reference for Financial Year Starting 1 April 2026
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| Profit band or item | Rate or threshold | Notes |
|---|---|---|
| Small profits rate | 19% | Applies to companies with taxable profits up to £50,000 |
| Main rate | 25% | Applies to companies with taxable profits over £250,000 |
| Lower threshold | GBP 50,000 | The entry point for tax rate adjustments, shared among associated companies |
| Upper threshold | GBP 250,000 | The point where the main rate fully kicks in, also split for associated companies |
| Marginal Relief fraction | 3/200 | The fractional multiplier used to calculate your tax discount in the middle bracket |
Frequently Asked Questions
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What is Corporation Tax?
Corporation Tax is the tax that limited companies in the UK pay on their annual profits. This includes money your business makes from trading, selling assets for a profit, or investing. Unlike personal income tax, there is no tax-free allowance for companies, meaning you pay tax on every pound of taxable profit. It is a vital part of business planning to estimate this throughout the year so you aren't caught off guard.
How do I calculate Corporation Tax?
To work out your bill, you start with your company's taxable profits for the year. Next, you check which tax band those profits fall into: the 19% small profits rate, the 25% main rate, or the sliding scale in the middle. You then apply the correct rate or use the Marginal Relief formula to find your final total. Our calculator handles all these steps in seconds, saving you from complex manual math.
What is the current UK Corporation Tax rate?
For the financial year starting 1 April 2026, the rates are split based on how much your business earns. If your taxable profits are £50,000 or less, you will pay the 19% Small Profits Rate. If your profits are over £250,000, you will pay the Main Rate of 25%. If your profits sit anywhere in between those two numbers, you will pay a blended rate thanks to Marginal Relief.
What is Marginal Relief in Corporation Tax?
Marginal Relief is a tax discount designed to help growing businesses transition smoothly between the low 19% rate and the higher 25% rate. Without it, crossing the £50,000 profit mark by just £1 would cause your entire profit to be taxed at 25%, which would be incredibly unfair! Instead, this relief acts as a gentle ramp, gradually increasing your effective tax rate as your profits grow. It ensures there is no sudden 'tax cliff' for expanding companies.
What counts as a good time to recalculate Corporation Tax?
It is smart to run a fresh calculation whenever your business experiences a major shift, like a sudden spike in sales or a large unexpected expense. You should also recalculate before making big decisions, such as paying out dividends to shareholders or investing in expensive new equipment. Doing this quarterly keeps your cash flow healthy and ensures you are always setting aside the right amount of money. It takes the stress out of your year-end tax prep.
Who should use a Corporation Tax calculator?
This tool is perfect for small business owners, directors, startup founders, and freelancers running limited companies. It is also incredibly useful for bookkeepers and financial advisors who want to give their clients a quick, reliable tax estimate. By using it regularly, anyone managing a business's finances can stay on top of their cash reserves. It bridges the gap between daily bookkeeping and official year-end accounting.
What are the limits of a Corporation Tax calculator?
While our calculator is highly accurate, it provides an estimate rather than an official, finalized tax return. It cannot automatically know about complex tax credits, specific industry reliefs, or non-standard capital allowances you might claim. It is always best to use these calculator results as a strong planning guide, then review the final numbers with a certified accountant before submitting. This gives you the perfect balance of quick insights and professional security.
How often does Corporation Tax change?
The UK government regularly reviews tax rates and rules, often announcing updates during Autumn Statements or Spring Budgets. These changes can alter the tax rates, shift the thresholds, or introduce new relief rules entirely. That is why we keep our calculator updated with the latest official figures, so you do not have to worry about outdated math. Checking in here before your financial year-end keeps your planning perfectly accurate.
Common Mistakes to Avoid
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- !Confusing your bookkeeping software's net profit with your actual taxable profit after adjustments.
- !Forgetting to declare active sister companies, which mistakenly keeps your tax thresholds too high.
- !Failing to scale down your tax thresholds if your company's accounting period is shorter than a full year.
- !Assuming you pay a flat 25% on everything the moment your profits cross the £50,000 mark.
Pro Tip
Always calculate your tax based on your taxable profit, not just your bookkeeping profit! Things like client entertaining are business expenses but aren't tax-deductible, while buying new machinery might qualify for 100% tax relief. Keeping these differences in mind ensures your tax estimate is incredibly close to the final bill.
Did you know?
Did you know that the concept of taxing corporations separately from their owners didn't really take off until the 19th century? Before then, governments mostly taxed physical property like windows, chimneys, or salt. Today, it is a vital tool that helps fund public services we all use every day!
References
Read the full guide on how to use this calculator effectively
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