There are several legitimate ways a UK limited company can reduce its Corporation Tax bill, but the aim should be to pay the correct amount of tax rather than spend money purely to create a deduction.
The main opportunities usually involve claiming allowable business expenses correctly, using capital allowances, considering employer pension contributions, using available losses and reliefs, and making genuine commercial decisions before the accounting year ends.
The right approach depends on your company’s profits, expenditure, assets, associated companies and wider circumstances. Good Corporation Tax planning therefore starts with accurate accounts and enough time to make decisions before the year-end.
This guide explains the main ways a limited company can reduce its Corporation Tax liability while staying within HMRC rules.
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How Can a Limited Company Reduce Corporation Tax?
The main way to reduce Corporation Tax is to reduce taxable profits or claim reliefs that the company is genuinely entitled to.
This can include deductible revenue expenses, capital allowances, employer pension contributions, Corporation Tax loss relief and specialist reliefs where the qualifying conditions are met.
Not every payment made by a company is tax-deductible. HMRC distinguishes between revenue expenses, capital expenditure and costs that are specifically disallowed. Revenue expenses must generally have a business purpose and must not be specifically prohibited, such as most client entertaining costs.
Tax planning should therefore focus on genuine commercial expenditure and properly supported claims rather than spending purely to create a tax deduction.
Understand Your Corporation Tax Position First
Before making tax-planning decisions, work out the company’s likely taxable profit and estimated Corporation Tax liability.
Review the latest management accounts, expenses, payroll, director remuneration, pension contributions, asset purchases, losses and expected year-end adjustments.
The company’s bank balance is not the same as taxable profit. Corporation Tax is based on the tax-adjusted profit calculation, so reliable bookkeeping and up-to-date accounts are essential.
If you first need to understand the rates that apply, see our guide to Corporation Tax rates for limited companies.
Claim Allowable Business Expenses Properly
Revenue expenses can generally be deducted when calculating taxable profit where they are incurred for the business, are not capital expenditure and are not specifically disallowed.
Depending on the circumstances, this can include costs such as accountancy and bookkeeping, software, business insurance, office costs, advertising, employee costs, business travel and other genuine operating expenses.
Costs with both business and private purposes require particular care. Where the business element can genuinely be separated, HMRC may allow the identifiable business portion. Client entertaining, however, is an example of expenditure that is normally specifically disallowed for Corporation Tax.
The objective is not to put as many payments as possible through the company. It is to make sure genuine deductible expenditure is neither missed nor incorrectly claimed.
Keep Better Records Throughout the Year
Better bookkeeping does not create a tax deduction by itself, but poor records can mean legitimate expenses and reliefs are missed.
Keep invoices, receipts, bank records, payroll records, expense claims, asset-purchase documents and evidence supporting any material tax relief claimed.
Good monthly bookkeeping also gives directors enough visibility to make tax-planning decisions before the year-end rather than after it.
Use Capital Allowances on Qualifying Assets
Buying equipment or machinery does not always create the same Corporation Tax deduction as an ordinary business expense. Instead, qualifying expenditure may receive relief through capital allowances.
Different allowances can apply depending on the asset and circumstances.
The Annual Investment Allowance remains £1 million, while qualifying companies may also be able to use 100% full expensing for qualifying plant and machinery. A new 40% first-year allowance applies to qualifying new and unused main-rate plant and machinery bought on or after 1 January 2026.
The correct allowance depends on the asset, ownership, use and transaction structure. Cars, leased assets and property-related expenditure can have different rules.
Where the company genuinely needs an asset, considering the timing before the year-end can affect which accounting period receives the tax relief.
Review Director Salary and Dividends
Salary and dividends have very different Corporation Tax consequences.
Genuine employment remuneration paid by the company can normally form part of the company’s deductible employment costs, subject to the normal tax rules. Salary can, however, create PAYE and National Insurance liabilities.
Dividends are different. They are distributions of post-tax profits and do not reduce the company’s Corporation Tax liability.
The most tax-efficient mix therefore depends on both company-level and personal taxes. It should not be determined by Corporation Tax alone.
Director remuneration should ideally be reviewed before the year-end rather than after all decisions have already been made.
Consider Employer Pension Contributions
Employer pension contributions can be Corporation Tax deductible where the normal conditions are satisfied.
HMRC applies the wholly and exclusively for the purposes of the trade test to employer pension contributions. Contributions forming part of genuine employee remuneration are commonly allowable, but unusually large or non-commercial arrangements can require closer review.
The timing also matters because the Corporation Tax deduction for employer pension contributions is generally linked to payment rather than simply recording a provision.
Pension decisions should also take account of the individual’s pension position and wider financial planning, not Corporation Tax alone.
Use Corporation Tax Loss Relief Where Available
A trading loss may be capable of reducing Corporation Tax for the same period, an earlier period or future periods, depending on the company’s circumstances and the type of loss.
HMRC allows qualifying trading losses to be set against profits in the same accounting period. Unused losses can generally be carried back against profits of the preceding 12 months, subject to the relevant conditions, or carried forward against future profits.
Different rules apply to trading losses, capital losses, property losses, terminal losses and groups of companies, so the correct treatment should be checked before making a claim.
Check Whether Specialist Corporation Tax Reliefs Apply
Some companies may qualify for specialist Corporation Tax reliefs, but these should only be claimed where the statutory conditions are genuinely met.
For accounting periods beginning on or after 1 April 2024, the old SME R&D scheme and previous RDEC regime have been replaced by the merged R&D expenditure credit scheme and Enhanced R&D Intensive Support (ERIS). The way relief is calculated depends on which scheme applies.
Companies carrying out qualifying patented innovation may also potentially elect into the Patent Box, which can apply an effective 10% Corporation Tax rate to qualifying Patent Box profits.
These are specialist regimes. Eligibility should be established from the technical facts rather than assumed because a company develops products, software or processes.
Qualifying charitable donations made by a company can also reduce total profits for Corporation Tax purposes, although making a donation purely to save tax will normally leave the company financially worse off overall.
Plan Genuine Expenditure Before the Year-End
Timing can affect when Corporation Tax relief is obtained.
If the company already intends to buy qualifying equipment, make a commercial pension contribution, incur necessary repairs or make another genuine business investment, completing the transaction before the accounting year-end can sometimes bring relief into the current period.
But spending £10,000 solely to save a fraction of that amount in tax is not sensible tax planning. The expenditure should make commercial sense first.
Tax planning is most effective when it changes the timing or treatment of expenditure the business genuinely needs, rather than creating unnecessary spending.
The Company Tax Return can be prepared after the accounting period ends, but many planning decisions cannot simply be backdated. Reviewing the position several months before year-end usually gives the company more options.
How to file a Company Tax Return
Common Corporation Tax Planning Mistakes
Many Corporation Tax problems come from missed deductions, poor records or decisions being made too late.
- missing legitimate deductible business expenses
- assuming every company payment is tax-deductible
- keeping inadequate records to support expenses or relief claims
- buying assets without checking which capital allowances are available
- leaving pension or director remuneration planning until after the year-end
- overlooking trading losses or other available reliefs
- claiming tax reliefs without checking the qualifying conditions
- mixing personal expenditure with company costs
- allowing director loan balances to develop without regular review
- spending money purely to obtain a tax deduction
Good tax planning should reduce the company’s tax exposure without increasing HMRC risk or weakening the commercial position of the business.
Get Help With Corporation Tax Planning
Effective Corporation Tax planning depends on the company’s actual numbers, commercial plans and tax position.
Accounting People can help review taxable profits, allowable expenses, capital allowances, losses, director remuneration, pension contributions and relevant Corporation Tax reliefs before the year-end.
We can also prepare the Corporation Tax computation and Company Tax Return so the planning decisions are reflected correctly in the figures submitted to HMRC.
Speak to our Corporation Tax accountants
How Early Should Corporation Tax Planning Start?
Corporation Tax planning works best before the accounting year ends.
Once the year has finished, legitimate deductions and reliefs can still be claimed where available, but decisions such as pension contributions, asset purchases and remuneration cannot always be recreated retrospectively.
Reviewing the company’s expected profit several months before year-end gives directors time to consider genuine commercial actions, forecast the tax liability and prepare the cash needed for payment.
If you want help reviewing your Corporation Tax position before year-end, speak to our Corporation Tax accountants
Frequently Asked Questions About Reducing Corporation Tax
Can a limited company reduce Corporation Tax?
Yes. A company can reduce its taxable profits or Corporation Tax liability through legitimate deductions, capital allowances, losses and qualifying reliefs, provided the relevant rules are satisfied.
Do business expenses reduce Corporation Tax?
Allowable revenue expenses reduce taxable profit, but the expense must satisfy the relevant Corporation Tax rules and must not be specifically disallowed.
Do dividends reduce Corporation Tax?
No. Dividends are paid from post-tax profits and do not reduce the company’s Corporation Tax liability.
Can pension contributions reduce Corporation Tax?
Employer pension contributions may be deductible where the relevant conditions are met, including the wholly and exclusively test.
Can buying equipment reduce Corporation Tax?
Qualifying expenditure may attract capital allowances such as the Annual Investment Allowance, full expensing or relevant first-year allowances.
Can company losses reduce Corporation Tax?
Potentially. Qualifying losses can sometimes be used against current, previous or future profits depending on the type of loss and applicable conditions.
