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Corporation Tax is a significant cost for many UK limited companies. However, there are several legitimate ways to reduce your Corporation Tax liability through allowable business expenses, tax reliefs, capital allowances, pension contributions and effective tax planning.
The key is to make sure your company claims every relief and allowable deduction it is entitled to while maintaining accurate records and complying with HMRC rules.
For the 2026/27 financial year, the main Corporation Tax rate remains 25%, while companies with profits of £50,000 or less generally pay the 19% small profits rate. Companies with profits between £50,000 and £250,000 may benefit from Marginal Relief, subject to the relevant conditions, including the impact of associated companies.
So, how can a UK company legally reduce its Corporation Tax bill?
Corporation Tax is a tax on the taxable profits of companies operating in the UK. It is not simply calculated by applying the Corporation Tax rate to total sales or turnover.
A company’s taxable profit is generally calculated by starting with its accounting profit and making the necessary tax adjustments, including deducting qualifying business expenses and claiming available allowances and reliefs.
This means effective Corporation Tax planning is about understanding what your company can legitimately deduct or claim before calculating its taxable profits.
One of the simplest ways to reduce taxable profit is to make sure the company claims all legitimate business expenses.
HMRC generally allows revenue expenses where they are incurred wholly and exclusively for the purposes of the business, provided they are not specifically disallowed.
Depending on the nature of your company, allowable expenses may include:
Keeping proper records is essential. An expense should not be claimed simply because it reduces your tax bill. It must meet the relevant tax rules.
Remember the “wholly and exclusively” rule
If an expense has both business and personal purposes, the tax treatment can become more complicated. Where a clearly identifiable proportion relates solely to business use, an appropriate business proportion may sometimes be deductible.
Your accountant can help determine whether an expense is fully deductible, partly deductible or disallowed.
Buying equipment or other qualifying assets for your company can create valuable Corporation Tax relief through capital allowances.
Capital allowances are different from ordinary revenue expenses. They provide tax relief on qualifying capital expenditure, such as certain:
HMRC confirms that companies may claim capital allowances when they purchase qualifying assets for use in their business.
Annual Investment Allowance
The Annual Investment Allowance (AIA) can be particularly valuable for qualifying expenditure. For 2026/27, the AIA limit is £1 million, subject to the applicable rules.
This means businesses making substantial qualifying investments should consider the tax implications before purchasing assets and should ensure that eligible expenditure is correctly identified in the Corporation Tax computation.
Capital allowance rules can be complex, particularly where different types of assets or accounting periods are involved, so professional advice can be useful.
Employer pension contributions can be another tax-efficient way for a company to manage its profits.
Where the relevant conditions are satisfied, employer contributions to a registered pension scheme can be deductible when calculating taxable business profits. HMRC states that contributions generally need to be incurred wholly and exclusively for the purposes of the employer’s trade or business.
For owner-managed companies, pension planning can therefore form part of a wider remuneration and tax-planning strategy.
However, pension contributions should be considered alongside the company’s financial position, the individual’s circumstances and the applicable pension rules.
Not every company makes a profit every year.
If your company makes a qualifying trading loss, there may be opportunities to use that loss against profits, depending on the circumstances and the applicable Corporation Tax rules.
HMRC recognises several categories of losses and reliefs, including trading losses, terminal losses, capital losses and property income losses.
For growing companies, understanding how losses can be utilised can be an important part of longer-term tax planning.
Rather than simply carrying a loss forward without considering the available options, businesses should review their circumstances with their accountant.
For owner-managed companies, the way directors receive money from the company can affect the overall tax position.
Salary, bonuses, employer pension contributions and dividends can have different tax and National Insurance consequences.
A company should therefore consider its remuneration structure as part of its wider financial planning rather than making decisions based solely on Corporation Tax.
It is also important to remember that dividends are distributions of profit rather than a normal deductible business expense for Corporation Tax purposes. Therefore, paying a dividend does not reduce the company’s taxable profit in the same way as an allowable business expense.
A professional accountant can help assess the company’s remuneration strategy based on the director’s circumstances and the company’s financial position.
Good bookkeeping is one of the foundations of effective Corporation Tax planning.
Incomplete records can result in businesses:
HMRC advises companies to understand whether expenses are capital or revenue in nature and to maintain accurate and detailed business records.
Regular bookkeeping also allows your accountant to identify potential tax-planning opportunities before the end of the accounting period.
Reducing Corporation Tax legally does not mean claiming every expense that has passed through the company’s bank account.
Some expenses are specifically disallowed for Corporation Tax purposes. Business entertaining, for example, is generally not deductible.
Similarly, an expense with a private purpose may not qualify for a Corporation Tax deduction.
The objective should therefore be tax efficiency, not artificial tax reduction.
A strong tax strategy identifies genuine business expenditure and legitimate statutory reliefs rather than creating artificial expenses.
There is no single Corporation Tax strategy that works for every UK company.
The most appropriate approach depends on factors such as:
For this reason, Corporation Tax planning should ideally take place throughout the financial year, rather than only when the annual accounts are being prepared.
Before submitting your Corporation Tax Return, consider whether your company has:
A professional accountant can help you determine which of these areas are relevant to your business.
Final Thoughts
Reducing Corporation Tax legally is primarily about using the tax rules correctly rather than avoiding tax artificially.
By claiming legitimate business expenses, making appropriate use of capital allowances, considering pension contributions, checking R&D eligibility, utilising losses and reviewing the company’s remuneration and investment strategy, businesses may be able to reduce their Corporation Tax liability while remaining compliant with HMRC requirements.
The most effective approach is to plan ahead. Waiting until the end of the accounting year can mean that some opportunities have already been missed.
Need help with Corporation Tax planning, tax-efficient business structuring or your company’s annual accounts?
Stan Lee Accountancy Ltd provides professional accounting and tax support for businesses in London and across the UK. Our team can review your company’s financial position, identify relevant tax-planning opportunities and help ensure your Corporation Tax Return is prepared accurately and efficiently.
Contact Stan Lee Accountancy Ltd today to discuss your Corporation Tax requirements.
Tax rules and rates can change. The information in this article is for general guidance and should not be treated as personalised tax advice. Companies should obtain professional advice based on their individual circumstances.
Yes. UK companies can legally reduce their Corporation Tax liability by claiming allowable business expenses, capital allowances and applicable tax reliefs. The company must meet the relevant statutory conditions and maintain appropriate records.
Qualifying business expenses may reduce taxable profits. Common examples include professional fees, staff costs, business premises costs, marketing, software and certain business travel expenses. Expenses generally need to satisfy the relevant tax rules, including the wholly and exclusively principle.
Potentially, yes. Qualifying equipment and other capital assets may benefit from capital allowances, including the Annual Investment Allowance or other applicable first-year allowances.
Employer pension contributions can potentially be deductible when calculating taxable profits, provided the relevant conditions are satisfied.
Generally, no. Dividends are distributions of post-tax profits and are not normally deductible when calculating a company’s taxable profits for Corporation Tax.
No. Tax relief should not be the sole reason for making a business expenditure decision. A company should only invest or incur expenditure where it makes commercial sense. Tax relief may then reduce the tax cost of qualifying expenditure.
