If you run a limited company in the UK, you need to know what rate of corporation tax you owe. The 2026 rules are not a single flat rate. There are two rates, with a band in the middle that affects a lot of small and growing businesses. This guide breaks it down plainly.

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Summary of 2026 Tax Bands

The UK uses a two-rate system for corporation tax in 2026:

• Small profits rate: 19% – applies when taxable profits are £50,000 or below
• Main rate: 25% – applies when taxable profits are above £250,000
• Marginal relief zone – for profits between £50,000 and £250,000, you pay somewhere in between

The middle zone is where most growing businesses sit, so understanding it matters.

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Who Does This Apply To?

Corporation tax applies to UK limited companies on their taxable profits. That includes trading income, investment income, and chargeable gains.

You are likely in the 19% band if:

• Your company’s taxable profits are £50,000 or under per year
• You have no associated companies sharing that threshold

You are likely in the 25% band if:

• Your company earns above £250,000 in taxable profits
• You run multiple associated companies (which changes the thresholds – more on this below)

You are in the marginal relief zone if:

• Your profits sit between £50,000 and £250,000

Most early-stage and small owner-managed businesses will land in the 19% band or somewhere in the marginal relief zone. The 25% main rate is really where larger companies end up.

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Small Companies and Associated Entities

This is the part that catches a lot of founders off guard. The £50,000 threshold is not based on just your one company. It gets divided by the number of “associated companies” you have.

Own two active limited companies? That £50,000 threshold gets split in half. Each company now has a £25,000 ceiling for the small profits rate. Same logic applies to the £250,000 upper limit.

HMRC has a specific definition of “associated company,” but the short version is: other companies you control, or that are controlled by the same person or group. If you have set up more than one UK company – or have any connections to overseas companies – this is worth checking properly. Not just skimming, actually checking.

For single-company founders, none of this changes anything. But if you are building a group structure or hold multiple businesses, map this out before assuming the 19% rate applies to you.

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Understanding Marginal Relief in 2026

Marginal relief exists to stop a brutal cliff edge between the two rates. Without it, crossing £50,001 in profit would push your entire tax bill to the higher rate. You would end up paying more tax for earning slightly more, which makes no sense.

So instead of flipping from 19% to 25% at a single point, the effective rate climbs gradually across the £50,000 to £250,000 band. The more profit you make in that range, the closer you get to 25% – but it is a steady rise, not a sudden jump.

You do not have to work out the marginal relief calculation yourself on your tax return. HMRC handles the formula side of it. What matters practically is knowing that if your profits fall in that band, you are paying somewhere between 19% and 25%, and that rate creeps upward as profits grow.

For small business owners, this makes a real difference. A business at £100,000 profit is not paying 25% on the whole lot. The relief keeps the bill proportionate to what the company is actually earning.

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Comparison for International Founders

If you are a Pakistani founder or Non-Resident Pakistani (NRP) weighing up where to base your business, the UK rate structure is worth understanding against other options.

Some Gulf business hubs offer zero corporate tax on qualifying income. European countries tend to sit somewhere in the 20-28% range depending on structure and jurisdiction. Within that context, the UK’s 19% small profits rate is genuinely competitive at the early stage. Once you are past £250,000 in profit, the 25% main rate puts you broadly in line with comparable economies.

The rate you actually end up paying depends on how your profits are structured and whether associated company rules come into play. A business earning under £50,000 in the UK pays less corporation tax than a similar business would in a lot of EU countries. That picture changes as the company scales up.

On pure tax cost, the UK can look attractive when you are starting out. The calculation gets more complicated once you factor in accounting costs, compliance requirements, and what happens to your thresholds if you are holding multiple entities.

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Frequently Asked Questions

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Next Steps for UK Compliance

Knowing the 2026 rates is a starting point. Actually making sure your company is filing under the right rate – particularly if you have associated entities or are moving between profit bands – is where professional support earns its keep.

If you want to make sure your company is correctly set up and tax-compliant under the current HMRC framework, our corporation tax service covers the full process from registration through to filing. UK-based or managing things from overseas, getting the structure right early saves you from fixing problems later.

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This article is for informational purposes only and does not constitute tax or legal advice. For guidance specific to your company’s circumstances, consult a qualified UK tax professional or accountant.