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Understanding Corporation Tax Rates and Marginal Relief: A Detailed Explanation

Dive deep into Corporation Tax rates & Marginal Relief mechanism. Learn how they impact your tax liabilities for effective financial planning

Corporation Tax Rates

Corporation Tax rates vary depending on the level of profits generated by a company. Here’s a breakdown of the rates:

  • Small Profit Rate: Companies reporting profits of less than £50,000 are subject to a Corporation Tax rate of 19%.
  • Main Profit Rate: Companies with profits exceeding £250,000 are taxed at a rate of 25%.

It’s important to note that these thresholds are adjusted proportionally based on the number of associated companies a company has. For instance, if a company has three associated companies, the thresholds are divided by four.

Calculating Thresholds with Associated Companies

Let’s consider an example where a company has taxable profits of £70,000 and no associated companies:

  1. Calculate the Difference: Subtract the company’s profits from the upper limit (£250,000). In this case, £250,000 – £70,000 = £180,000.
  2. Determine Marginal Relief: The Marginal Relief fraction, representing the difference between the main profit rate (25%) and the small profit rate (19%), is applied. In our example, this fraction is 0.015.
    • £180,000 (difference) × 0.015 (Marginal Relief fraction) = £2,700 of Marginal Relief.
  3. Calculate Corporation Tax before Marginal Relief: Determine the tax liability without Marginal Relief.
    • £70,000 (profit) × 25% (main profit rate) = £17,500.
  4. Deduct Marginal Relief: Subtract the available Marginal Relief from the tax liability.
    • £17,500 (tax bill without Marginal Relief) – £2,700 (Marginal Relief) = £14,800.


Marginal Relief for Corporation Tax

Marginal Relief provides a gradual increase in the rate of Corporation Tax for companies with annual taxable profits falling between £50,000 and £250,000. However, certain entities are ineligible for Marginal Relief, including non-UK resident companies, close investment holding companies, and companies with profits exceeding £250,000.

To simplify the calculation process, HMRC offers an online calculator. Nevertheless, understanding the underlying principles is crucial for informed decision-making regarding tax planning and compliance.

In summary, while navigating Corporation Tax rates and Marginal Relief may seem daunting, grasping the fundamentals empowers businesses to optimize their tax strategies effectively. By leveraging available relief mechanisms and seeking professional guidance when needed, companies can minimize tax liabilities and enhance financial resilience.

Should you require further clarification or assistance regarding Corporation Tax rates and Marginal Relief, our team is here to help. Contact us today to ensure your business’s tax affairs are managed with precision and expertise.

Common questions about this topic

Straight answers for UK business owners — then book a call if you want us to handle the filing.

When is corporation tax due?

Corporation tax is usually due nine months and one day after the end of your accounting period. Accounts and the CT600 must also meet Companies House and HMRC filing deadlines. We manage the timetable for clients.

Can you help with R&D or capital allowances?

Where the rules allow, we review reliefs such as capital allowances and signpost R&D opportunities during year-end. Eligibility depends on your activities — we’ll be clear about what applies.

How do ProKeeper’s fees work?

We quote fixed monthly or per-return fees before work starts — no surprise hourly bills for the agreed scope. Packages can cover bookkeeping, VAT, payroll and year-end together.

How do I get help after reading this guide?

Book a free consultation. Tell us your situation, deadlines and software — we’ll recommend a clear next step and fixed fee if you want us to take over.

Still unsure? Book a free consultation — mention this article and we’ll pick up from there.

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