Want to cut your Corporation Tax bill the right way?
If you’re wondering how to pay less Corporation Tax in 2026, you’re not alone. With the main rate now at 25%, many UK companies are feeling the squeeze on profits. The good news is that HMRC offers several legitimate ways to reduce your bill if you know where to look.
Reducing Corporation Tax isn’t about loopholes or risky schemes. It’s about smart tax planning and using the reliefs designed to support UK businesses.
From claiming every allowable expense to unlocking powerful tax incentives like R&D relief, a few well-chosen strategies can make a real difference to your bottom line.
In this guide, you’ll learn:
- How the UK’s Corporation Tax system works in 2026
- Ten fully legal, HMRC-approved ways to reduce your corporation tax bill
- How smart planning helps you stay compliant while keeping more of your profit
If you’d rather focus on growing your business, Sleek’s accounting services can handle everything from registration to year-end filing.
How Corporation Tax works in 2026
Corporation Tax is paid on company profits and the rate you pay depends on how much your business earns.
Since April 2023, the main rate has been 25%, but smaller companies still benefit from a lower rate and something called marginal relief.
Here’s how it breaks down:
Profit band | Effective Corporation Tax rate | Who it applies to |
Up to £50,000 | 19% (small profits rate) | Small limited companies |
£50,001–£250,000 | Between 19% and 25% (marginal relief applies) | Medium-sized companies |
Over £250,000 | 25% (main rate) | Larger companies |
If your company’s profits fall between £50,000 and £250,000, HMRC applies marginal relief to taper the rate gradually. This means the more profit you make, the closer your rate moves towards 25%.
Corporation Tax is calculated on taxable profits after allowable expenses and reliefs are deducted. Knowing which deductions you can claim is key to paying less tax without crossing any compliance lines.
If you need a refresher on deadlines or payment methods, see our guide on how to pay Corporation Tax.
Next, let’s look at the practical steps that can lower your bill legally in 2025.
10 Legal Ways to Pay Less Corporation Tax in the UK
1. Claim every allowable business expense
Every valid business cost reduces your taxable profit and therefore your Corporation Tax bill. HMRC’s “wholly and exclusively” rule means an expense must exist only for business use.
You can claim for:
- Office rent and utilities
- Staff wages and training
- Travel and accommodation
- Professional fees and insurance
- Software, marketing, and subscriptions
Keep receipts and digital records. Many companies lose money by missing small but legitimate expenses, such as staff parties or the use of home offices. Good record keeping is essential, and Sleek’sbookkeeping tips can help you stay compliant while maximising deductions.
2. Use pension contributions to lower profits
Employer pension contributions are tax-deductible, reducing taxable profits and Corporation Tax. They’re also exempt from National Insurance, unlike salary increases.
Company directors can make contributions through their business as long as they’re within annual limits. This turns pension funding into a straightforward tax-saving strategy.
3. Maximise capital allowances and full expensing
Capital allowances let you deduct the cost of qualifying assets such as machinery, equipment, and vehicles.
The Annual Investment Allowance (AIA) allows up to £1 million in full deductions per year. Larger investments may qualify for “full expensing,” giving 100% relief in the year of purchase, or 50% for certain long-life or special rate assets.
For example, if your company makes £200,000 in profit and spends £50,000 on machinery, you’ll pay Corporation Tax only on £150,000.
Capital allowances also apply when buying or selling property and assets connected with your business, as explained in paying Corporation Tax when selling business assets.
4. Claim R&D Tax Relief for innovation
Businesses investing in innovation can reclaim a percentage of their spending through R&D tax relief. SMEs can claim up to 27% of qualifying costs, and larger companies can claim 15% through the RDEC scheme.
Projects that qualify include:
- Developing new software or systems
- Improving production or automation
- Solving technical challenges in engineering or design
These claims need solid technical and financial documentation, but they often yield significant returns.
5. Use Patent Box Relief to lower your tax rate
If your company earns income from patented inventions or processes, Patent Box Relief allows a reduced Corporation Tax rate of 10% on those profits.
To qualify, you must own or exclusively license the patent and elect into the scheme within two years of the relevant accounting period. Patent Box works particularly well alongside R&D relief and other Corporation Tax liability planning strategies for innovative firms.
6. Donate to charity the smart way
Corporate donations reduce taxable profits and support good causes at the same time. You can donate cash, shares, land, or equipment to UK-registered charities.
Donating assets instead of cash can be more tax-efficient since you can claim relief on market value and avoid capital gains tax on disposal. Keep evidence of each donation in your company accounts to meet HMRC rules.
7. Review your business structure
Your company’s structure can affect how much tax you pay. Many businesses benefit from reviewing whether their setup remains efficient.
Examples include:
- Incorporating if you currently trade as a sole trader or a partnership
- Creating a holding company to manage multiple subsidiaries
- Splitting high-risk and low-risk activities into separate entities
8. Offset past losses against future profits
If your company makes a loss, you can carry it forward to offset against future profits, reducing Corporation Tax later. In some cases, you can carry losses back to reclaim tax paid in previous years.
For example, a £10,000 loss can offset £10,000 of future profit, saving £2,500 in Corporation Tax at the 25% rate. Accurate record keeping is essential for HMRC approval.
9. Pay your Corporation Tax early
Paying Corporation Tax ahead of the deadline can earn small amounts of interest from HMRC while reducing the risk of late payment penalties. It’s also a simple way to demonstrate financial discipline. You’ll find more about early payment options in how to pay Corporation Tax.
10. Get professional tax advice
Corporation Tax planning becomes more complex as your business grows. A qualified accountant can review your structure, expenses, and reliefs to ensure you’re not overpaying.
Sleek’s accounting experts help businesses identify the best mix of reliefs, prepare CT600 filings, and stay compliant. Smart tax planning isn’t avoidance. It’s about claiming what you’re entitled to and keeping more of what you earn.
Key ways to Reduce Corporation Tax in 2026 at a glance
After reviewing the main strategies, it helps to see how each one contributes to reducing your Corporation Tax bill in practice. The table below summarises who qualifies, how each method works, and what kind of savings your company could expect when applied correctly.
Tax-saving method | Who it applies to | How it reduces Corporation Tax | Typical saving |
Business expenses | All limited companies | Deducts legitimate costs from profits | Varies by spend |
Pension contributions | Employers and directors | Contributions are tax-deductible and NI-free | Up to 25% of contribution value |
Capital allowances & full expensing | Companies investing in assets | 100% deduction on qualifying assets | Up to £250,000+ depending on spend |
R&D Tax Relief | Innovative SMEs and large companies | Tax credit on R&D costs | Up to 27% of qualifying spend |
Patent Box Relief | Companies with patents | 10% tax rate on patent-related profits | Up to 60% tax rate reduction |
Charitable donations | All companies | Reduces taxable profits | Relief on donation value |
Business restructuring | Growing or group companies | Optimises tax efficiency through structure | Varies by setup |
Loss relief | Companies with recent losses | Offsets past losses against future profits | Up to 25% of loss value |
Early tax payment | All companies | HMRC pays credit interest | Around 4% annualised (variable) |
Professional advice | All businesses | Ensures compliance and strategic tax use | Prevents overpayment and penalties |
Even small steps, like tightening expense records or reviewing structure, can add up to meaningful tax savings over time. For more complex reliefs such as R&D or Patent Box, working with a qualified accountant ensures accuracy and full compliance with HMRC rules.
Looking to cut your Corporation Tax bill without breaking the rules?
Common Mistakes That Increase Your Corporation Tax Bill
Even well-run companies can end up paying more Corporation Tax than necessary. These are the most frequent errors that reduce tax efficiency and draw HMRC attention.
1. Mixing personal and business expenses
Blurring the line between business and personal costs leads to disallowed claims and potential penalties. Always use a dedicated business bank account and clear transaction records. Setting up the right company structure from the start helps prevent overlap.
2. Missing filing or payment deadlines
Late CT600 submissions or missed payments automatically trigger fines and interest. HMRC deadlines are strict, so schedule reminders early and keep your Corporation Tax payment dates visible in your accounting calendar.
3. Ignoring smaller reliefs
Many SMEs miss minor deductions such as staff training, digital subscriptions, or business mileage. Over a financial year, those small items can create a meaningful tax difference.
4. Overlooking capital gains
Selling property, shares, or equipment without planning ahead can create unexpected tax charges. When you sell or reinvest, consider how the timing affects your liability. Our piece on selling business assets efficiently explains how to offset gains properly.
5. Neglecting professional advice
Tax planning evolves with every budget cycle. Working with a qualified accountant ensures you claim all available reliefs while remaining compliant.
Strong record keeping is the simplest way of avoiding these mistakes. Keep digital copies of receipts, contracts, and board decisions for at least six years to protect your deductions if HMRC ever reviews your accounts.
Reduce Your Corporation Tax Bill with Sleek
Lowering your Corporation Tax bill doesn’t have to be complicated. With the right structure, accurate bookkeeping, and timely use of tax reliefs, you can stay compliant and keep more of your company’s profit.
Sleek helps businesses identify every opportunity to reduce their tax liability; from R&D and Patent Box claims to optimising capital allowances and pension contributions. Our accountants handle the details, so you can focus on growing your business with confidence.
Whether you need help filing your CT600, setting up your company structure, or planning next year’s tax strategy, we’ll make sure everything runs smoothly and stays fully compliant with HMRC.
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FAQs on How to Pay Less Corporation Tax
How can I legally reduce my Corporation Tax bill in 2026?
You can reduce your Corporation Tax by claiming all allowable business expenses, making pension contributions, using capital allowances, and applying for reliefs like R&D or Patent Box. These methods are HMRC-approved and available to most UK companies.
What can I offset against Corporation Tax?
You can offset costs such as staff salaries, rent, utilities, equipment purchases, marketing, and pension contributions. You can also use previous losses to offset future profits, reducing your tax bill in profitable years.
When should I seek professional help to reduce Corporation Tax?
If your company earns income from multiple sources, operates internationally, or invests in property or technology, it’s best to seek expert advice. A qualified accountant ensures all reliefs are applied correctly and helps avoid HMRC penalties.
What tax reliefs are available to UK companies?
UK companies can claim a range of reliefs, including R&D Tax Relief, Patent Box, capital allowances, and loss relief. The right combination depends on your industry, profit level, and business activities.
Is it possible to avoid paying Corporation Tax completely?
No. All UK companies must pay Corporation Tax on taxable profits. However, smart planning ensures you don’t pay more than necessary. Legitimate, HMRC-compliant planning is about timing and claiming the right reliefs, not evading tax.
How does reinvesting profits affect Corporation Tax?
Reinvesting profits in qualifying business assets or R&D projects can reduce taxable income. For example, spending on machinery or innovation qualifies for full or partial deductions under capital allowances and R&D relief.
How can a limited company pay less Corporation Tax?
A limited company can lower its tax liability by reinvesting profits in the business, maximising capital allowances, donating to charity, and planning director remuneration efficiently. Structuring payments through salaries, dividends, and pensions helps balance tax efficiency with compliance.
