How to Reduce Corporation Tax: 10 Legal Ways for 2026/27

Most directors only think hard about Corporation Tax when the bill arrives, nine months after the year has closed. By then the year is locked. The equipment bought a few days late, the pension payment that never happened and the salary set without much thought can’t be changed afterwards.

So if you want to know how to reduce corporation tax, the practical answer is to plan during the year, while there’s still time to act. This guide covers the legal options for the 2026/27 financial year, explains the rate you’re really saving at, and works through the numbers on an example company.

Corporation Tax Rates for 2026/27 and Why 26.5% Matters

The value of any saving depends on your rate. GOV.UK sets out three bands:

Where does 26.5% come from? HMRC’s manual calculates marginal relief as 3/200 of the difference between the upper limit (£250,000) and your profit. Each extra £1 of profit attracts 25p of tax and also removes 1.5p of relief, so it costs 26.5p in total. The reverse is true too: every deductible £1 within that band saves 26.5p, which makes planning especially worthwhile for mid-sized profits.

Associated companies and short periods

Both profit limits are shared out between associated companies and reduced for accounting periods shorter than 12 months. With two associated companies, each has limits of £25,000 and £125,000. Directors with several companies often hit the higher bands much sooner than they realise, so confirm your limits before anything else.

How to Reduce Corporation Tax: 10 Legal Ways

Each idea below either cuts taxable profit directly or makes sure HMRC gives you credit for spending the company already does. Here’s a summary before the detail.

1. Claim all allowable expenses

HMRC lets you deduct spending that is purely for the business. Typical examples are rent, software, insurance, accountancy fees, marketing, business travel and relevant training. The simplest saving is making sure nothing is missed, so snap and file each receipt the day you pay, rather than searching through emails eleven months later.

2. Write off equipment with capital allowances

Through the Annual Investment Allowance (AIA), a company can deduct the full cost of qualifying plant and machinery, such as tools, vans and computers, up to £1 million a year. Business cars don’t qualify. Companies can also use full expensing on new main-rate plant. Two changes matter for 2026/27: spending since 1 January 2026 can attract a new 40% first-year allowance, and for Corporation Tax the main pool rate dropped to 14% (previously 18%) on 1 April 2026.

3. Make employer pension contributions

Company contributions to a registered pension are generally deductible, as long as the director’s total remuneration is in line with what the role is worth. HMRC’s manual confirms they’re deductible in the period they’re actually paid, so a contribution promised for later won’t count this year. Neither National Insurance nor dividend tax applies. Contributions count towards the director’s £60,000 annual allowance.

4. Set a sensible director’s salary

Salary is a deductible expense, while dividends come from profit that has already been taxed. A modest salary therefore lowers Corporation Tax, but employer National Insurance of 15% applies above £5,000 a year. GOV.UK confirms that a company whose only director is its only employee liable for employer National Insurance can’t claim the Employment Allowance. The section below runs the numbers.

5. Time purchases you’d make anyway

If a new van or laptop is already planned for next quarter, buying it just before your year end brings the tax relief forward by 12 months. That’s sensible planning. Buying things you don’t need simply to lower the bill isn’t: you still spend £1 to save, at most, 26.5p.

6. Claim R&D relief

If your team is tackling a genuine scientific or technological problem, which can include certain software projects, you may be eligible. Under the merged scheme, the expenditure credit rate is 20%. Loss-making SMEs whose qualifying R&D spending is at least 30% of total spending may claim enhanced R&D intensive support instead. Keep clear technical records, because HMRC checks claims closely.

7. Use trading losses wisely

GOV.UK sets out three uses for a trading loss: offset it against other profits in the same period, carry it back to the previous 12 months, or carry it forward. A carry-back can produce a refund of tax already paid, which helps cash flow after a difficult year.

8. Check marginal relief has been applied

Make sure your software or accountant has applied marginal relief, counted any associated companies, and reduced the limits for a short accounting period. Mistakes here are easy to miss and can cost hundreds of pounds.

9. Offer tax-free staff benefits

A handful of perks give the company a deduction while costing employees nothing in tax. Trivial benefits cost up to £50 each and must not be cash or a reward for work, with directors of close companies capped at £300 a tax year. An annual party open to all employees is exempt if it costs £150 or less per person.

10. Consider an electric company car

For Corporation Tax, a brand-new zero-emission car can be written off in full in year one under a first-year allowance that currently runs to 31 March 2027. The benefit-in-kind rate for a zero-emission car is 4% for 2026/27, a fraction of the charge on petrol or diesel models. Confirm the allowance hasn’t ended before you order.

Not sure which of these apply to you? Our guide to the limited company tax return explains where each relief is claimed.

How to Reduce Corporation Tax: A Worked Example

The 26.5% effect is easiest to see with real figures. Here’s one company making two decisions it had planned anyway.

Corporation Tax falls by £3,975 after the pension and by a further £5,300 after the equipment: 26.5% of each sum, or £9,275 combined. Marginal relief in each row is 3/200 × (£250,000 − profit). Assumptions: the contribution leaves the company’s bank before 31 March 2027 and fits the director’s role, and the machinery is used in the trade and qualifies for AIA.

Remember that Fernhill still spent £35,000. Tax relief makes good decisions cheaper, but it doesn’t make them free. Use the relief to fine-tune when committed spending happens, not to justify spending you didn’t need.

Salary, Dividends or Pension? The 2026/27 Mix

Every pound you draw affects two tax bills: the company’s and yours. This table puts the three usual routes side by side.

Picture a company with one director and no Employment Allowance. Moving salary up to £12,570 (from £5,000) means £7,570 more pay plus £1,135.50 of employer National Insurance. Both are deductible, so at the 19% rate they save about £1,654 of Corporation Tax. That leaves the company around £519 better off, before counting any dividend tax saved. In the marginal relief band the gain is larger. Personal circumstances still decide the ideal figure, so revisit it at the start of each tax year. For broader support, see what an accountant for your limited company handles.

Corporation Tax Traps to Avoid

• Last-minute spending sprees. Buying kit the business won’t use loses 73.5p or more of every pound.
• Paying private bills from the business account. HMRC won’t allow the deduction, and the money may end up as an overdrawn director’s loan. If that loan isn’t repaid within 9 months of the year end, GOV.UK says the company pays Corporation Tax at 33.75% of the outstanding amount.
• Signing up to ‘tax-saving’ schemes. If an arrangement exists only to dodge tax, expect HMRC to challenge it, often with penalties added.
• Generous wages for relatives. If the pay outstrips the work they actually do, the excess can be disallowed.
• No cash put aside. A smaller bill still has to be paid, usually 9 months and 1 day after the year end, so save for it monthly.

FAQs

What is the most effective way to reduce corporation tax?

There’s rarely one trick. Small companies usually get the biggest result from three things together: complete expense records, AIA on necessary equipment and company pension payments. Where profit sits between £50,000 and £250,000, each pound deducted is worth up to 26.5p.

Can you avoid corporation tax legally?

Real profits will always attract some tax. What you can do is shrink the bill with the reliefs the law already offers. Anything set up purely to sidestep tax risks a challenge and penalties.

Will a director’s salary lower my company’s tax?

It will. The company deducts both the salary and its employer National Insurance, whereas dividends come out of post-tax profit. Many directors set pay near the £12,570 personal allowance, though the best figure varies from person to person.

Are company pension contributions tax-deductible?

Usually, yes. They’re deductible in the period they’re paid, provided the overall pay package is reasonable, and there’s no National Insurance on them.

Should I buy equipment before my year end?

Yes, if the purchase was coming anyway, because the relief arrives a year sooner. If you don’t need the item, the saving never covers the cost.

Do trading losses help with Corporation Tax?

They do. Use the loss against other profits in the same period, claim it back against the previous 12 months for a refund, or keep it for future profits.

When is corporation tax due?

Companies with profits of up to £1.5 million pay 9 months and 1 day after their accounting period ends. The return itself has a 12-month deadline.

Final Verdict: How to Reduce Corporation Tax

Working out how to reduce corporation tax is less about clever schemes and more about habits. Find out which band you’re in, because 26.5% in the marginal range changes the maths. Then keep complete expense records, claim allowances on kit the business uses, direct spare profit into a company pension and pay yourself a sensible salary. Do the review eight weeks before your year end each year, and the savings for a typical owner-managed company can run into thousands, with nothing HMRC would object to.