12 Practical Ways to Reduce Your Corporation Tax (2026)

Corporation tax is one of the main taxes limited companies need to understand. Get it right, and you stay compliant while keeping more cash in the business. Get it wrong, and it can quickly become expensive.

This guide explains what corporation tax is, how it’s calculated, and practical, legitimate ways to reduce your bill without falling foul of HMRC.

What Is Corporation Tax?

Corporation tax is charged on the profits of:

• UK limited companies
• Clubs, societies, associations, and co-operatives
• Certain other organisations with taxable profits

If your business is incorporated, corporation tax applies to you.

Current Corporation Tax Rates (From April 2023)

The UK uses a tiered corporation tax system:

• 19% – Small profits rate (profits of £50,000 or less)
• 25% – Main rate (profits over £250,000)
• Between £50,000 and £250,000 – Marginal relief applies

Marginal relief gradually increases the effective tax rate from 19% to 25%, rather than jumping straight to the higher rate. HMRC uses a set formula to calculate this automatically, smoothing the transition as profits grow.

What Profits Does Corporation Tax Apply To?

Corporation tax is not just about sales income. It applies to several types of profit, including:

• Trading profits – income from normal business activities
• Investment income – such as interest, shares, or bonds
• Chargeable gains – profits from selling assets like property, equipment, or shares

Understanding what counts as taxable profit is the first step toward managing your liability properly.

12 Practical Ways to Reduce Your Corporation Tax Bill

Reducing corporation tax isn’t about shortcuts. It’s about planning, accurate records, and making full use of the reliefs already built into the UK tax system.

Here are 12 proven, HMRC-compliant strategies.

1) Claim All Allowable Business Expenses

Every legitimate business expense reduces your taxable profit. This includes items such as:

• Office costs and software
• Staff wages and benefits
• Utilities and insurance
• Training and professional fees

The key is good record-keeping. Clear receipts and explanations make claims easier and protect you during HMRC checks. Our small business bookkeeping service can help you stay organised and audit-ready all year round.

2) Use R&D Tax Relief If You Innovate

If your company works on improving products, services, or processes, you may qualify for Research & Development (R&D) tax relief.

• SMEs can deduct up to 186% of qualifying R&D costs
• Loss-making SMEs may receive an enhanced payable credit
• Large companies can claim under RDEC, offering a taxable credit of 20% on qualifying expenditure

R&D relief is powerful but tightly regulated, so accuracy matters.

3) Claim Capital Allowances on Equipment and Assets

Capital allowances let you deduct the cost of qualifying assets from your profits. Key options include:

• Annual Investment Allowance (AIA)
  • Up to £1 million per year
  • 100% deduction in the year of purchase
• Full expensing (from April 2023)
  • 100% first-year relief on qualifying new plant and machinery
  • No upper limit

This is especially useful when upgrading machinery, vehicles, or IT systems.

Note: If your business closes, AIA cannot be claimed in the final accounting period. Instead, balancing charges or allowances apply.

4) Pay HMRC on Time

Late payments can trigger interest and penalties, increasing your overall tax cost. Using accounting software to track deadlines and automate reminders can prevent unnecessary charges and reduce stress.

5) Claim Business Mileage Correctly

If directors or employees use personal vehicles for work, mileage allowances can be claimed:

• 45p per mile for the first 10,000 miles
• 25p per mile after that

Accurate mileage logs are essential, but the tax savings add up quickly.

Of course, anyone claiming mileage for business driving must hold a valid UK driving licence. For directors or employees who are new to driving—or brushing up ahead of a practical test—the UK driving theory test is the essential first step before getting on the road for work.

6) Make Employer Pension Contributions

Employer pension contributions are:

• Fully tax-deductible
• Not subject to employer National Insurance

They reduce corporation tax while supporting staff and offering directors a tax-efficient remuneration option. To ensure your payroll is handled correctly and compliantly, our payroll services for UK employers cover everything from monthly processing to year-end filings.

7) Reduce Unnecessary Cross-Border Tax

If you operate internationally, tax can become complicated. Double taxation treaties help ensure profits aren’t taxed twice, but structure matters. Poor planning can create avoidable liabilities.

Professional advice is strongly recommended when overseas income or subsidiaries are involved.

8) Give to Charity and Reduce Tax

Donations to registered UK charities can reduce taxable profits. This includes:

• Cash donations
• Equipment or surplus stock
• Sponsorships

As long as the charity is registered and records are kept, your business benefits both financially and reputationally.

9) Review and Optimise Your Company Structure

In some cases, restructuring can improve tax efficiency. Examples include:

• Separating different business activities into subsidiaries
• Consolidating entities to reduce administrative costs

Changes must have a genuine commercial purpose. HMRC will challenge arrangements created solely to avoid tax.

10) Use the Patent Box Regime

If your company earns profits from patented inventions, the Patent Box can reduce corporation tax on those profits to 10%.

This relief is designed to encourage innovation and can be highly valuable for qualifying businesses.

11) Pay Directors a Reasonable Salary

Director salaries are an allowable expense and reduce taxable profits. Combining salary with dividends often creates a more tax-efficient overall strategy than dividends alone.

12) Invest in Plant and Machinery Strategically

Investing in qualifying plant and machinery can significantly reduce corporation tax through:

• AIA
• Full expensing

Practical takeaway: Under full expensing, every £1 invested can reduce taxable profits by £1 immediately—making it a strong incentive for growth-focused companies.

Final Thoughts: Reducing Corporation Tax the Right Way

Reducing corporation tax isn’t about cutting corners. It’s about:

• Claiming what you’re entitled to
• Planning investments wisely
• Using available reliefs effectively
• Staying compliant with HMRC

For small businesses especially, corporation tax can feel complex when combined with everyday operational pressures. Professional advice and the right tools can make a significant difference. You may also find our guide on ways to pay less tax legally in the UK useful—many of the same principles apply to directors and shareholders alongside their company’s tax position.

Handled properly, corporation tax becomes part of a broader financial strategy—supporting growth, stability, and long-term success rather than holding your business back. View our accounting packages for limited companies, or contact SRZ Accountancy to arrange a free consultation.