A profitable limited company can still be paying more corporation tax than necessary. You may have cash sitting in the business account, but no clear answer to the next decision: extract it as salary or dividends, leave it in the company, invest in equipment, contribute to a pension, or claim reliefs that haven't made it into the accounts.
The legal ways to reduce corporation tax usually come from making the right combination of decisions about remuneration, allowable costs, capital investment, pensions, reliefs, losses and timing. They don't come from disguising personal spending as business expenditure or creating paperwork after the event. This guide focuses on UK limited companies, contractors and owner-managed businesses. The examples are simple illustrations, not predictions of what your company will save.
You also need to separate corporation tax savings from personal tax savings. A company pension contribution may reduce the company's taxable profit, while a dividend strategy mainly affects the director's personal tax position after corporation tax has been calculated. Current thresholds, eligibility rules and accounting treatment should be checked before action, and every claim needs evidence that explains the business purpose.
1. Director salary optimisation
Salary and dividends should be planned together, not chosen independently. Salary is normally deductible for corporation tax when it represents genuine remuneration for the director's work, but it can create employer and employee National Insurance exposure. Dividends aren't deductible from company profits, although they can be useful for extracting funds after corporation tax without salary-based National Insurance.
The right salary depends on the company's profit, the director's other income, employment status and whether the company can support the payment. A director working through a company outside IR35 will often model salary, dividends and pension contributions together. Someone inside IR35 faces a different analysis because the deemed employment rules can change the available structure.
Use a remuneration model rather than relying on a standard figure. Calculate salary after tax with Tax Compass can help you compare salary outcomes, but the result still needs to reflect the company's accounts and your wider personal position.
What needs to be documented
Run salary through payroll, record the payment properly and keep board records explaining the decision. A dividend needs distributable reserves, a formal declaration and a dividend voucher. Calling a payment a dividend doesn't make it one if the company hasn't earned enough distributable profit.
Review the approach each year because tax thresholds and personal circumstances change. Consider whether a spouse shareholding or employer pension contribution belongs in the wider plan, but don't create either arrangement solely as a paper exercise. The company must be able to show what was paid, why it was paid and how the decision was made.
2. Corporation tax relief on business expenses
Allowable expenses reduce taxable profit when they're incurred wholly and exclusively for the trade. That includes ordinary operating costs such as accountancy, legal and bookkeeping fees, software subscriptions, office supplies, repairs and business insurance, provided the records support the claim.
The practical problem is often not the rule. It's incomplete bookkeeping. Directors pay for a business subscription on a personal card, lose an invoice, or leave a legitimate professional fee uncategorised. The company then pays corporation tax on profit that is higher than its true commercial profit.
Review the expense categories rather than searching for obscure deductions. A digital bookkeeping system should retain invoices and receipts, while notes should explain mixed or unusual costs. Home working, travel and vehicle expenses need particular care because private use can restrict the deduction. Entertainment is also restricted in ways that gifts and genuine business costs may not be.
A disciplined expense review
- Match costs to the trade: Explain how each uncertain cost supports the company's work.
- Keep source records: Retain invoices, receipts, contracts and payment evidence in a consistent digital system.
- Check missed costs: Review prior accounts for legitimate expenses that were paid but never recorded, subject to correction rules and professional advice.
- Separate VAT from corporation tax: The VAT treatment of an expense can differ from its corporation tax treatment. Review the treatment using guidance on VAT on expenses.
- Avoid private reclassification: A personal purchase doesn't become allowable because it appears in the business bank feed.
The tax saving is only one part of the decision. Spending a pound to save corporation tax still leaves the company with less cash, so the expense should have a genuine commercial purpose.
3. Capital allowances, plant and machinery and property classification
Capital expenditure is where timing can change the tax result substantially. A laptop, server, tool, desk, fitted installation or other qualifying asset may receive relief through capital allowances rather than ordinary revenue expenses. The treatment depends on the asset, its use and the allowance available when it is bought.
The Annual Investment Allowance rules allow businesses to deduct 100% of the full value of qualifying plant and machinery, with an allowance amount of £1 million. That can make an otherwise necessary purchase more efficient when the company has sufficient profits and the asset qualifies.
Property transactions need more detailed analysis. A building's structure isn't automatically plant and machinery, but parts of a fit-out may qualify. A survey can identify qualifying elements such as electrical systems, heating, ventilation and fixtures. The invoice, fixed asset register and survey should distinguish repairs, integral features, plant and machinery, and structural work.
Timing matters after 2026
The UK corporation tax rates remain 19% for profits up to £50,000 and 25% above £250,000, with marginal relief between those levels, according to HMRC's corporation tax rates and allowances. Budget 2025 introduced a 40% first-year allowance for main-rate expenditure from 1 January 2026, while the main-rate writing-down allowance reduces from 18% to 14% from 1 April 2026, so the purchase date and asset classification can affect the relief profile.
Don't buy equipment purely for a deduction. Compare immediate relief with cash retention, financing costs, replacement needs and the company's expected profit. Keep a fixed asset register showing the date, cost, description and business use.
This video provides another visual explanation of capital allowances and asset treatment.
4. Pension contribution relief
Employer pension contributions can move surplus company profit into a pension without treating the payment as salary or dividend. HMRC states that contributions to a registered pension scheme can be deductible for corporation tax as an expense of management, with relief given in the accounting period in which the contribution is paid. The contribution must still be commercially justifiable and within the relevant pension rules.
This strategy suits a director who doesn't need all the cash immediately and accepts that pension money is locked away until the applicable access rules allow withdrawal. It may be particularly relevant where the company has recurring profits and the director's personal income would make additional salary or dividends less attractive.
Read the detail in this guide to company pension contributions and tax relief. The company should pay the contribution directly to the registered scheme, retain confirmation of payment and record the decision in its board paperwork.
The trade-off is access
A pension contribution isn't a substitute for working capital. Before paying it, forecast corporation tax, VAT, payroll, supplier commitments and personal cash needs. A SIPP may offer investment control, but that control brings responsibility for investment selection and administration.
Check annual allowance rules, unused allowance from earlier years and any other pension inputs. Directors with multiple incomes or complex pension histories should obtain specialist advice before making a large payment. The corporation tax deduction is valuable, but an unsuitable contribution can create personal tax charges or leave the company short of cash.
5. Spouse shareholding and dividend splitting
A genuine spouse shareholding can allow dividends to be allocated between two shareholders rather than paid entirely to one person. That may use both individuals' personal tax positions and reduce the overall personal tax cost of extraction. It doesn't reduce the company's corporation tax because dividends are paid from post-tax profits.
The arrangement must transfer a real economic interest. A spouse who receives dividends should own the shares or the relevant class of shares. A purely nominal arrangement, informal promise or payment made without proper company records can invite scrutiny.
Control and ownership can be separated
A company may use different share classes, including voting and non-voting shares, where that structure is commercially appropriate. The directors should approve the issue or transfer, update the register of members, retain share certificates and document the dividend decision. Dividend vouchers should show the shareholder, share class and amount.
This isn't only a tax question. A share transfer can affect family finances, succession, relationship breakdown and future control of the company. Consider whether the spouse is investing, contributing to the business or accepting a genuine passive interest, and take advice before transferring shares.
Review the arrangement if circumstances change. A spouse who becomes a shareholder should understand the rights attached to the shares and the possibility that dividends won't be available in every period. The company must have sufficient distributable reserves before declaring any dividend, regardless of how the shares are divided.
6. Research and development tax credits
R&D relief is available for qualifying innovation, not for every software project or technical improvement. The work needs to address a genuine technological or scientific uncertainty and go beyond routine development that a competent professional could readily resolve.
A software company may qualify where its team is solving an uncertain technical problem, testing approaches and recording the results. An engineering business may qualify where it develops a new process or component and the outcome wasn't readily deducible at the outset. Routine website work, ordinary configuration and straightforward feature development generally need careful separation from qualifying activity.
Build the claim from contemporaneous evidence
Record the project objective, the uncertainty, the work attempted, the people involved, the time spent and the outcome. Payroll records, project tickets, technical notes, version histories, test results and contractor invoices can help connect expenditure to the qualifying work.
Classify staff time cautiously. Only the relevant proportion of an employee's work should be included, and subcontracting and externally provided worker rules require specific treatment. A claim should explain the technical uncertainty in plain terms rather than use broad marketing language.
The financial outcome depends on the company's scheme, tax position, accounting period and qualifying costs. Avoid relying on a percentage or expected cash credit without a current calculation. A specialist review is sensible where the company has substantial R&D costs, has claimed before, or is unsure whether its projects meet the technical definition.
7. Trading allowance for sole traders and self-employed
The trading allowance is an individual tax relief, not a corporation tax deduction for a limited company. It matters when a person is deciding whether to operate as a sole trader or through a company, or when they have a separate small self-employed activity alongside company work.
The allowance amount is £1,000, so it can simplify reporting where actual expenses are low and difficult to apportion. Instead of recording every small cost, the trader deducts the allowance from relevant trading income, subject to the eligibility rules.
That simplicity has a cost. If actual allowable expenses are higher than the allowance, claiming actual expenses may produce the better result. A freelance consultant with substantial professional fees, travel, equipment or home-working costs should compare both methods before filing.
Don't confuse the two tax systems
A limited company can't use the trading allowance to reduce its corporation tax profit. Company expenses belong in the company accounts, while sole-trader expenses belong on the individual's tax return. Mixing the two can create duplicate claims or leave the company claiming costs that it didn't incur.
Keep separate bank records and invoices where both activities exist. The choice should reflect the actual trading arrangement, not an attempt to move income or expenses between the company and individual.
8. Loss relief and carry-forward strategies
A trading loss isn't necessarily wasted, but the company must claim the appropriate relief and preserve evidence of how the loss arose. Depending on the circumstances, a company may carry a loss forward against future profits or consider available carry-back options. Group companies may also create additional planning questions, although eligibility and ownership conditions need careful review.
Loss planning is particularly important for businesses with volatile income, significant development costs or a start-up period. The timing of expenditure, income recognition and claims can affect when the loss becomes useful, but tax planning shouldn't override accurate accounts.
Model the cash effect, not just the tax effect
Suppose a company has a loss in one accounting period and expects profitable trading later. Carrying the loss forward may reduce future corporation tax, but it doesn't create cash today. A carry-back claim, where available, may produce an earlier repayment, though the rules and claim deadlines must be checked.
Maintain management accounts that show current-year profit, expected expenditure and available losses. The corporation tax return should state the relief being claimed, with supporting schedules retained. Don't assume an accounting loss automatically produces the best tax outcome, especially where there are capital losses, non-trading income, change-of-trade issues or group companies.
Directors should also avoid accelerating costs solely to manufacture a loss. The company needs a commercial reason for the spending, and the records must show that the expenditure belongs to the relevant trade and period.
9. Vehicle and travel cost deductions
Business travel planning starts with choosing the correct method. A director using a personal vehicle may claim approved mileage relief for qualifying business journeys, while a company vehicle normally involves company-car reporting and Benefit in Kind considerations. Actual running costs can be relevant, but private use must be separated from business use.
Keep a mileage log showing the date, destination, purpose and business miles. A calendar entry or vague monthly estimate won't provide the same support as a contemporaneous record. Travel from home to a permanent workplace is generally treated differently from travel to temporary workplaces, so the route and working arrangement matter.
Electric vehicles need a whole-cost comparison
An electric company car may offer favourable Benefit in Kind treatment compared with a petrol alternative, and qualifying electric vehicles may receive capital allowance treatment. The decision still depends on purchase or lease cost, charging arrangements, expected mileage, private use, salary sacrifice or company ownership, and the director's personal tax position.
Don't compare only the corporation tax deduction. A company-owned vehicle can create a benefit charge for the director, while a personally owned vehicle brings a different reimbursement analysis. Run both options through a calculation before committing.
If the company uses actual expenses, retain fuel, servicing, insurance and finance records. If it uses mileage relief, apply the chosen method consistently and don't claim the same cost twice.
10. Timing of income and expenses
Tax timing can change when a liability arises without changing the underlying commercial profit. Accruals accounting records income and costs in the period they relate to, while cash-based treatment, where eligible, follows receipts and payments. The company must use the accounting basis and tax rules that apply to its circumstances.
A December service completed under an ongoing commercial arrangement shouldn't be moved into a later period because the invoice is delayed. Equally, genuine payment terms, completion dates and contractual milestones can affect recognition where the accounting treatment supports them. The paperwork must reflect what happened.
Time investment with the profit forecast
Review expected taxable profit before buying assets, paying bonuses, settling pension contributions or bringing forward repairs. The Annual Investment Allowance guidance explains how qualifying plant and machinery expenditure can receive immediate relief, but the best date depends on the company's accounting period, profit level and the interaction with other allowances.
Use timing to manage cash and tax together:
- Forecast monthly profit: Identify whether the company is heading towards a higher corporation tax band or an unusually low-profit period.
- Check payment dates: Pension relief is linked to the accounting period in which the contribution is paid, according to HMRC's pension tax manual.
- Respect commercial reality: Don't delay invoices or bring forward costs without a genuine business explanation.
- Retain the decision trail: Keep contracts, purchase orders, invoices and board notes showing why the timing was chosen.
For the financial year 2026, the legislation provides a 25% main corporation tax rate and a standard marginal relief fraction of 3/200, as set out in the enacted corporation tax legislation. The relevant accounting period and profit calculation still need to be checked.
Comparison of 10 Corporation Tax Reduction Strategies
| Strategy | Implementation complexity | Resource requirements | Expected outcomes | Ideal use cases | Key advantages |
|---|---|---|---|---|---|
| Director Salary Optimisation | Low–Medium, payroll changes and tax knowledge | Payroll software, accountant advice, annual review | Moderate NI and income tax savings (typical mid‑earner benefits) | Owner‑directors, small limited companies, contractors outside IR35 | Reduces National Insurance, preserves employment status, easy to implement |
| Corporation Tax Relief on Business Expenses | Low, routine bookkeeping but needs substantiation | Accurate receipts/invoices, accounting software, record‑keeping | Pound‑for‑pound reduction in taxable profit (e.g., 19% corporation tax saving) | Any company with legitimate operating costs | Immediate, tangible tax saving; formalises existing costs |
| Capital Allowances (Plant & Machinery / Property) | Medium–High, asset classification and potential disputes | Fixed asset register, invoices, possible specialist survey | Large accelerated deductions (AIA up to £1m; FYA for qualifying green assets) | Businesses investing in equipment/refurbishment or buying property | Significant upfront relief; uncovers overlooked allowances; FYA for green assets |
| Pension Contribution Relief | Medium, pension rules and allowance monitoring | Employer pension scheme/SIPP, modelling, governance records | Corporation tax deduction + no personal tax/NI on contributions; substantial long‑term benefit | High‑earning directors seeking tax‑efficient profit extraction | Double tax advantage; builds retirement savings tax‑efficiently |
| Spouse Shareholding & Dividend Splitting | Low–Medium, legal transfer and documentation required | Share transfers, share certificates, board minutes, legal advice | Reduced personal tax by utilising multiple allowances (modest savings) | Married owners or family businesses with spare personal allowances | Simple income splitting; uses spouses' allowances without complex restructuring |
| R&D Tax Credits | High, technical eligibility and detailed evidence required | Detailed project records, technical reports, specialist advisor often needed | Enhanced deductions or cash credits (material benefit for qualifying R&D) | Companies doing innovation, software, engineering or process R&D | Direct cash benefit for loss‑makers; substantial enhanced relief encouraging innovation |
| Trading Allowance (Sole Traders) | Very Low, simple election on Self Assessment | Minimal records if electing; compare against actual expenses | Flat £1,000 deduction from trading income (limited value) | Low‑expense sole traders, casual or part‑time traders | Simplicity; avoids detailed expense apportionment and record‑keeping |
| Loss Relief & Carry‑Forward Strategies | Medium, planning and formal claims needed | Accurate accounts, timing/planning, corporation tax return claims | Converts losses into tax relief (value depends on future profits or carry‑back rules) | Startups, R&D firms, volatile income businesses | Flexibility to time tax relief; preserves value of losses for profitable years |
| Vehicle & Travel Cost Deductions | Low–Medium, choose method and keep records | Mileage logs or full expense invoices, vehicle purchase docs | Tax relief via AMAR or actual costs; EVs may get 100% FYA and lower BIK | High‑mileage consultants, owner‑drivers, companies buying vehicles | Choice of methods; AMAR simplicity; favourable treatment for electric vehicles |
| Timing of Income & Expenses (Accruals vs Cash) | Medium, accounting basis choice and year‑end planning | Accounting system, cashflow planning, commercial documentation | Legitimate deferral/acceleration of taxable profit to smooth tax liabilities | Seasonal businesses, firms near tax thresholds, smaller businesses eligible for cash basis | Genuine flexibility to manage tax timing; aligns tax with commercial reality |
Turn tax ideas into a defensible company plan
The ten options fit into three practical decisions.
Recurring profit extraction includes salary, dividends, spouse shareholding and employer pension contributions. These strategies affect both the company's corporation tax calculation and the director's personal tax position. A salary may reduce company profit but create payroll costs. A dividend doesn't reduce corporation tax, but may be efficient for personal extraction after the company has paid tax. A pension contribution can reduce company profit while sacrificing immediate personal access to the money.
Qualifying expenditure and investment includes allowable expenses, capital allowances, vehicles and R&D claims. The company should spend money because the business needs the asset, service or development work, not because a deduction exists. Tax relief improves the economics of a sound purchase, but it doesn't turn an unnecessary cost into a profitable investment.
Timing and loss management includes accounting treatment, capital purchase dates, pension payment dates, loss claims and the use of available allowances. Directors often miss value because the accounts are prepared as a backward-looking compliance exercise. A forward-looking forecast can show whether a payment, purchase or claim is more useful now, later or not at all.
A sensible review sequence is straightforward:
- Calculate current taxable profit: Start with management accounts, add back disallowable costs and identify capital expenditure, losses and reliefs.
- Separate company and personal effects: Show corporation tax, income tax, National Insurance, Benefit in Kind and cash-flow consequences separately.
- Check eligibility and thresholds: Confirm the rules for pension contributions, R&D, capital allowances, spouse arrangements, IR35 and loss relief before changing anything.
- Gather supporting records: Collect invoices, payroll reports, mileage logs, pension confirmations, project evidence, share documents, contracts and board minutes.
- Model alternatives: Compare salary, dividends, pension funding, reinvestment and retaining cash before making a payment or purchase.
- Implement consistently: Update payroll, dividend records, the fixed asset register and bookkeeping so the tax return matches the underlying transactions.
The figures used in this guide are illustrations unless they were linked to official guidance. Your result depends on the company's accounting period, profit profile, other income, ownership, assets and claims history. R&D claims, property allowances, pension limits, spouse arrangements, losses and IR35-sensitive remuneration all warrant specialist advice when the facts are complex.
A useful starting point is to use Tax Compass to compare your current position with the available decisions, then decide whether a personalised tax strategy review is appropriate. The aim isn't to chase every possible relief. It's to create a documented plan that reduces avoidable tax while protecting cash, compliance and long-term business flexibility.
Tax Compass helps limited company directors, contractors and sole traders compare practical tax decisions around remuneration, pensions, expenses, capital allowances and timing. Visit Tax Compass to review your position and decide whether a personalised tax strategy review could help you act with greater clarity.