The year-end bookkeeping is open, the receipts are spread across your desk, and one question keeps coming back: what has the company missed, and what would HMRC reject? A company-paid cost isn't automatically an allowable expense. It needs a business purpose, supporting evidence and the right treatment for Corporation Tax, VAT and any personal benefit.
That distinction matters even more for a director working outside IR35. The useful question isn't “Can my company pay for this?” It's “Why was it bought, who benefits, and can the records prove it?” This guide cuts through the tick-box lists and focuses on the decisions that affect an allowable expenses limited company strategy.
The Question Behind Every Receipt
At year end, a contractor may be looking at software invoices, fuel receipts, a laptop purchase, professional subscriptions and several costs that resist easy classification. Putting everything through the company and leaving the decisions until later is poor practice. Review each cost when it arises, while its purpose and evidence are still clear.
A director might buy a monitor for client work, pay for a train journey to a temporary workplace and renew professional indemnity insurance. Each has a credible connection with the trade, but the paperwork must support that connection. The invoice, date, payment trail and business explanation should agree. A receipt that says only “online purchase” gives HMRC little to work with.
Practical rule: A cost belongs in the accounts because of its purpose and evidence, not simply because it passed through the company bank account.
For a UK limited company, the central test is HMRC's “wholly and exclusively” principle. A cost must be incurred entirely for business purposes to qualify as a deduction against Corporation Tax, and it must be included correctly in the company's accounts. The official HMRC guidance on company expenses deducted before Corporation Tax sets out that foundation.
Before approving any purchase, ask four questions:
- Business purpose: What activity in the company's trade required the spending?
- Private benefit: Does the director, family member or anyone else receive personal use?
- Evidence: Is there an invoice, receipt, mileage record or written calculation?
- Treatment: Is it revenue expenditure, capital expenditure, a reimbursement, a benefit or a disallowed cost?
These questions matter particularly for a 2026 outside-IR35 director. A company payment can affect Corporation Tax, dividends, benefits-in-kind and the evidence supporting the wider working arrangement. A £100 personal subscription does not become tax-efficient because it appears in the ledger. Remove it from the Corporation Tax calculation, record it as a benefit where appropriate, or treat it as money owed by the director.
Good planning is selective. Keep claims that support the trade, reduce tax within the rules and withstand a sensible HMRC review. Drop costs that create paperwork without a defensible business purpose.
What Makes an Expense Allowable
For a 2026 outside-IR35 director, the right question is not whether a receipt looks business-like. It is why the company incurred the cost. HMRC's allowances, expenses and reliefs collection sets out the central test: the expense must be incurred wholly and exclusively for the company's business. “Necessary” helps describe the commercial reason, but purpose decides the tax treatment.
A printer used only for contracts, invoices and project documents has a clear business purpose. A phone used for both work and private calls needs a fair split. Claim the business element, keep private use out of the deduction, and check whether a benefit-in-kind rule applies.
Apply the test before payment
Run five checks before the company pays:
- Trade purpose: Would the company have bought it to carry on its trade, even without the director's personal preferences?
- Private use: Is the item used exclusively for business? If not, calculate the business share accurately or record the appropriate benefit-in-kind treatment.
- Revenue or capital: Is it an ordinary running cost, or a substantial equipment purchase? Capital expenditure normally needs separate consideration through capital allowances.
- Restriction: Could a specific rule disallow it? Client entertaining, fines and personal costs can fail even where business activity is involved.
- Evidence: Can the records show the supplier, amount, payment and commercial reason? Keep the invoice and a concise description with the claim.
Purpose also affects how the payment interacts with dividends, benefits-in-kind and IR35 evidence. A company-paid cost may reduce accounting profit but still be added back in the Corporation Tax computation. It may be allowable for Corporation Tax while creating a personal tax or reporting issue because the director has private use.
Write the commercial reason when the purchase is made, not months later when the receipt has lost its context. For mixed-use spending, retain the calculation supporting the business proportion. “Director expenses” is not an explanation. A dated note and contemporaneous paperwork give the claim a defensible audit trail. Claim costs that support the trade and survive review. Drop spending that creates administration without a clear tax result.
The Five Categories Every Limited Company Uses
Most limited-company costs fit into a small number of working categories. The category helps with bookkeeping, but it never overrides the business-purpose test.
| Category | Typical allowable costs | Key warning |
|---|---|---|
| Premises | Business rent, business rates, utilities, repairs, cleaning and an appropriate share of home-working costs | Separate private household use. Home costs need a defensible business apportionment |
| Staff | Salaries, employer National Insurance, pensions, training, recruitment and reimbursed employee travel | Confirm the company is paying a genuine employment or operational cost |
| Vehicles and travel | Business mileage, fuel, insurance, servicing, parking, tolls and public transport | Ordinary commuting is different from business travel. Track journeys and review company-car consequences |
| Administration | Software, stationery, postage, broadband, phones, subscriptions, equipment repairs and bank charges | Personal use can create a restriction or benefit-in-kind issue |
| Professional fees | Accountancy, legal advice, business insurance, consultancy and relevant professional subscriptions | Personal advice and costs connected with private assets need separate treatment |
Premises and staff
A rented office brings obvious operating costs, including rent, utilities, cleaning and repairs. A director working from home needs more care. The company should claim only a defensible business share of costs, or use an appropriate HMRC method where available. Don't turn ordinary household spending into a company deduction just because a laptop sits on the kitchen table.
Staff costs are usually easier to justify when the company employs the person and the payment supports the trade. Salaries, employer National Insurance, pension contributions, training and recruitment all need proper payroll or accounting treatment. A director's personal course or lifestyle subscription doesn't become staff expenditure because the director is also an employee.
Vehicles, travel and administration
Business journeys need a reliable log showing the date, destination and purpose. HMRC's approved mileage benchmark is 45p per mile for the first 10,000 business miles in a tax year and 25p per mile thereafter, as outlined in this UK limited-company mileage guide. Ordinary commuting isn't business travel, while journeys to genuine temporary workplaces can qualify when the rules are met.
Mileage is often cleaner than claiming individual fuel receipts for a personal vehicle because the benchmark is intended to cover the wider motoring cost, including depreciation, servicing and insurance. Keep business and private mileage separate, and use the limited-company mileage deduction guide when checking the calculation.
Administration includes the tools that keep the company operating, from Microsoft 365 and accounting software to stationery, bank charges and business broadband. Professional fees should relate to the company rather than the director's private affairs. The question in every category is the same: does this cost support the trade, and can the company prove it?
A Worked Example for a £180k Outside-IR35 Director
A worked example can make the tax effect clear, but the figures below are an illustration rather than a claim about a particular taxpayer. Assume an outside-IR35 director has £180,000 of profit before the listed expenses, and the company incurs the following genuine business costs during the year.
The listed costs total £14,400. The £900 laptop is treated here as a business equipment purchase qualifying for relief through the company's tax computation. The exact treatment depends on the asset and current capital allowance position, so the example keeps the focus on the arithmetic rather than presenting a universal filing answer.
| Expense category | Annual cost (£) | Corporation Tax saved (£) | Net cost to company (£) |
|---|---|---|---|
| Home-office proportion | 1,200 | 300 | 900 |
| Professional subscriptions | 600 | 150 | 450 |
| Business mileage | 3,000 | 750 | 2,250 |
| Accountancy fees | 1,500 | 375 | 1,125 |
| Business laptop | 900 | 225 | 675 |
| Other genuine operating costs | 7,200 | 1,800 | 5,400 |
| Total | 14,400 | 3,600 | 10,800 |
Using the 25% Corporation Tax rate specified for this illustration, the company's taxable profit falls from £180,000 to £165,600. The illustrative Corporation Tax charge therefore falls from £45,000 to £41,400, creating a £3,600 Corporation Tax reduction. The saving isn't free money. The company has still spent £14,400, so its cash cost after the illustrative tax effect is £10,800.
What the example does not prove
The table doesn't mean a director should spend £14,400 to save £3,600. Spending money solely to create a deduction is poor planning. The cost must first be commercially justified, and the tax relief reduces the cost of something the company needed anyway.
Salary, dividends and employer pension contributions sit outside this simple expense schedule. Dividends aren't deductible from company profits, while remuneration and pension planning require their own checks around affordability, personal tax and available allowances. Before deciding how much profit to distribute, use the guide to how much dividend a director can take alongside the company's accounts and reserves.
The strongest claims in this example are the ones with an obvious link to the trade, such as accountancy, business mileage and equipment used for company work. The home-office line needs a calculation, and the laptop needs correct capital treatment. That difference is the point. A large expense isn't automatically valuable, while a modest, well-supported cost can be entirely worth claiming.
Where HMRC Draws the Line
Not every claim reduces your tax bill. Some spending is plainly disallowed, while other costs look commercial until private benefit or weak evidence changes the result. For a 2026 outside-IR35 director, disciplined expense records matter. A deduction that fails the business-purpose test can create a company tax adjustment, a benefit-in-kind issue, or both.
Client entertaining is the classic trap. A meal with a prospective customer may support a relationship, but client entertainment is generally disallowed for Corporation Tax. Political donations are not ordinary trading costs. Everyday clothing remains private in character even if the director wears it to meetings, unless it is genuine specialist clothing or protective equipment.
Claims to stop before they reach the accounts
- Client entertaining: The company may record the payment, but discussing business over a meal does not make it a deductible trading cost.
- Political donations: Supporting a political party is not the same as buying an operational service for the company's trade.
- Everyday clothing: A suit or ordinary branded clothing can be worn privately. Adding a logo does not remove the private-use problem.
- Private living costs: Household upgrades, personal subscriptions and family spending do not become business costs because the company card paid.
Borderline spending needs a clear allocation. A dual-use gadget, generic productivity subscription or subscription shared with family members may contain a business element, but claim only that identifiable portion. Record who used it, what business activity required it and how private use was excluded. If you cannot explain those points, leave the claim out.
High director loans need separate attention. Do not disguise them as expenses. The same warning applies to round-pound subscriptions for relatives. Before submitting a claim, ask: Would an independent business buy this on the same terms, and can I show the business-only portion? If the answer is no, leave it out or obtain advice.
Over-claiming can expose weak bookkeeping, private spending and inconsistent treatment across the accounts. The HMRC guidance on reporting expenses and benefits explains that employers providing expenses or benefits to employees or directors will usually need to report them. Classification therefore matters beyond the Corporation Tax computation.
The video below provides another visual explanation of common disallowed categories.
Corporation Tax, VAT and Benefits-in-Kind Explained Separately
One receipt can face three different tax questions. Treating them as one test is how directors end up with clean bookkeeping but an untidy tax position.
Corporation Tax asks whether the company can deduct the cost in calculating taxable trading profit. The starting point is the wholly and exclusively test, subject to specific restrictions and correct accounting treatment. VAT asks whether the company can recover input VAT under the VAT rules and has the necessary VAT evidence. Benefits in kind ask whether an employee or director receives private value from something the company provides.
| Expense | Deductible for CT? | VAT recoverable? | BiK exposure |
|---|---|---|---|
| Home internet | Business element may qualify | Depends on business use and VAT evidence | Private use may need separate review |
| Electric car | Depends on the company's use and capital or running-cost treatment | Depends on VAT rules and use | Private availability can create a company-car benefit |
| Mobile phone | Business use can qualify | Depends on contract, invoice and business use | Private use may change the treatment |
| Season ticket | Business travel may qualify in the right circumstances | Depends on the nature of the supply and evidence | Personal or commuting use can create an issue |
Separate the questions in the ledger
A company can deduct an operating cost for Corporation Tax while recovering only part of the VAT. A company can also deduct the cost while reporting private use as a benefit. HMRC's Corporation Tax allowances and reliefs guidance makes the personal-use point clear: private use of something supplied by the company can turn the personal element into a benefit.
That means a company-paid phone isn't automatically a problem, but the contract, use and reporting position should be clear. A director who uses company-funded accommodation, a vehicle or subscriptions privately shouldn't bury that benefit in an ordinary expense category.
VAT needs its own evidence trail. The Tax Compass guide to VAT on expenses is useful for checking the input VAT question separately from Corporation Tax. Don't assume that a valid company invoice settles all three tracks.
The sensible workflow is to code the cost first, identify any private use, then ask whether a benefit report or VAT restriction applies. “Allowable” is not a universal tax clearance. It answers one question only.
Smarter Routes for the Money You Were Going to Spend Anyway
Expense planning works best as a routing decision. The company may need to fund a cost, but the most efficient route could be an ordinary expense, a capital purchase, an employer pension contribution, salary sacrifice or a personal purchase funded from dividends.
| Spend | As expense | Capital allowance | Salary sacrifice | Dividend-funded |
|---|---|---|---|---|
| Electric vehicle | Running costs may qualify where business-related | Consider the capital treatment before purchase | May be relevant where an employment arrangement supports it | Director owns it personally and pays from post-tax income |
| Employer pension contribution | Usually treated as a company cost when properly structured | Not applicable | May be structured through remuneration planning | Director contributes personally after receiving income |
| Home broadband and hardware | Business-only or apportioned use needs evidence | Equipment may require capital treatment | Can be considered where the benefit rules fit | Director pays privately from distributed income |
| Director training | Qualifies where it supports the existing trade | Usually not the main route | May fit remuneration planning in some arrangements | Director funds it personally |
The £15,000 electric vehicle example in the planning brief highlights why headline purchase price isn't enough. The private-use benefit and company-car treatment must be checked before purchase, and the stated £22,000 BiK charge in that scenario should be verified against the actual vehicle and current rules rather than assumed. A company car can be attractive in the right circumstances, but it isn't automatically a cheap way to extract value.
The same discipline applies to the £40,000 employer pension contribution scenario. An employer contribution can reduce company profit when it meets the relevant conditions, while an equivalent dividend isn't a deductible company expense. That doesn't mean the pension route always wins. Annual allowance, earnings, affordability, investment objectives and access rules still need checking.
Route the value, don't chase receipts
Home broadband is often cleaner when the company provides a genuine business service or an appropriate employment benefit, rather than pretending the entire household contract is business-only. Hardware may be a revenue or capital item depending on its nature and treatment. Training should strengthen the trade the director already operates, not fund an unrelated personal career change.
Outside IR35, the director has more scope to consider the full profit extraction picture. Inside IR35, the expense position becomes narrower and public-sector rules removed the old 5% allowance, as discussed in this contractor expenses and IR35 planning guide. Once IR35 applies, don't rely on the broad expense assumptions used for an outside-IR35 company. Review pension contributions, remuneration and capital expenditure reliefs instead.
Records, Reviews and When to Hand It Over
A busy director doesn't need a complicated system. Use a separate business bank account, reconcile it monthly against a consistent expense category list, and store digital receipts for six years, following the record-keeping approach described in HMRC compliance checks guidance.
Run a short quarterly review. Check personal items, mixed-use calculations, mileage logs, missing invoices and any payment made personally that the company still owes you. Keep a written note for unusual costs while the commercial reason is fresh.
Expenses normally flow into the company accounts and the Corporation Tax computation, where allowable costs reduce taxable profit. Don't assume a personal return or company return will automatically correct poor classification. The filing route depends on the item, the company and the benefit involved.
DIY has reached its limit when:
- Turnover exceeds £150,000: The volume and interaction between VAT, expenses and profit extraction justify a structured review.
- Your IR35 position changes or is reassessed: The assumptions behind broad contractor expense planning may no longer apply.
- Benefit-in-kind exposure exceeds £1,500: A specialist should check reporting, payroll and the company's treatment before the issue spreads.
Tax Compass provides practical guidance on limited-company expenses, Corporation Tax planning, VAT treatment and director extraction decisions. If your receipts, IR35 status or company benefits need a structured review, visit Tax Compass and use its resources to identify the decisions that deserve specialist attention.