Allowable Business Expenses for UK Limited Companies: What You Can and Can't Claim

Every pound your limited company spends on a legitimate business expense is a pound that reduces your Corporation Tax bill. At the current main rate of 25%, that means every £100 of allowable expenses saves you £25 in tax. For a company turning over £200,000, the difference between a founder who tracks expenses properly and one who doesn't can easily be £3,000–5,000 a year — money that stays in the business instead of going to HMRC.

Yet expense claims remain one of the most common triggers for HMRC compliance checks. The line between a legitimate business cost and a personal expense disguised as one is where founders — especially first-time directors running their own limited company — consistently get it wrong. Not because they're trying to cheat, but because nobody explained the rules in plain English.

This guide covers the "wholly and exclusively" test that governs every deduction, walks through each major expense category with concrete examples, explains capital allowances for equipment and vehicles, and flags the five mistakes most likely to attract HMRC's attention. If you're a UK limited company director who wants to claim everything you're entitled to — and nothing you're not — this is the reference you need.

The golden rule: "wholly and exclusively" for business purposes

Before looking at specific categories, you need to understand the single principle that governs every expense claim. Under s. 54 of the Corporation Tax Act 2009 (and the equivalent income tax rules in ITTOIA 2005), an expense is only deductible if it was incurred "wholly and exclusively" for the purposes of the trade.

This test has three practical implications:

1. The purpose must be business, not personal. A laptop bought for work is deductible. A laptop bought for your teenager's schoolwork is not — even if the company paid for it. If it's used for both, you must apportion.
2. "Wholly" means the entire expense, not part of it. If an expense has a dual purpose — part business, part personal — HMRC's default position is to disallow the whole thing. The exception is where a clearly identifiable part is exclusively for business (e.g. a phone bill where business calls are itemised separately).
3. "Exclusively" means the motive, not just the outcome. A director's gym membership might help them perform better at work, but if the primary purpose is personal fitness, it fails the test. HMRC looks at why the expense was incurred, not what secondary benefits it produced.

If you can answer "yes" to this question — "Would the company have incurred this expense even if the director had no personal interest in it?" — the expense is almost certainly allowable. If the answer is "probably not," tread carefully.

Category-by-category guide to allowable expenses

Below is every major expense category a UK limited company director is likely to encounter. For each, we cover what's clearly allowable, what's borderline, and what to avoid.

Office costs and business premises

If your company rents an office, co-working space, or workshop, the rent, business rates, utilities (gas, electricity, water), and insurance are fully deductible. So are office supplies: stationery, printer ink, postage, and cleaning costs.

Working from home is where it gets nuanced. If a director works from home, the company can pay a flat-rate allowance of £6 per week (£26 per month) without any receipts or calculations. This is the HMRC-approved "use of home as office" rate. Alternatively, the company can pay a proportion of actual household costs (mortgage interest or rent, council tax, utilities, broadband) based on the number of rooms used and hours worked — but this requires detailed records and a formal calculation. Most small companies stick with the £6/week rate for simplicity.

If you use a registered office address service — which keeps your home address off the public Companies House register — the cost is fully deductible as a business expense. It's a legitimate business service with no personal element.

Staff costs

Salaries, wages, bonuses, employer's National Insurance contributions, employer pension contributions, and any recruitment costs (agency fees, job adverts) are allowable. So is statutory sick pay, statutory maternity/paternity pay, and any training courses that are relevant to the employee's current role.

Director salaries are also deductible — this is one of the primary ways founders extract money from a limited company. However, HMRC may challenge a director's salary if it appears artificially high relative to the work being done, particularly in a company where the director is also the sole shareholder. The salary must be a reasonable reflection of the work performed.

Remember: if your company pays any salaries, you must register for PAYE before the first payday. PAYE is not triggered by incorporation or by paying dividends — only by paying wages.

Travel and subsistence

Business travel — getting from one workplace to another, visiting clients, attending conferences, or travelling to a temporary work site — is deductible. This includes:

• Train, bus, and air fares for business journeys
• Hotel accommodation when staying away overnight for business
• Meals while travelling or staying away overnight on business (reasonable costs only — HMRC will not allow fine dining as a routine claim)
• Mileage if the director uses their personal car for business journeys — HMRC's approved mileage rates are 55p per mile for the first 10,000 miles and 25p per mile thereafter (the first-10,000-mile rate rose from 45p to 55p from 6 April 2026)
• Parking fees and congestion charges incurred during business travel

Commuting is not business travel. The journey from your home to your regular place of work is a personal expense, no matter how far it is. This catches out directors who work from home most of the week and assume that driving to a co-working space or the company's office once or twice a week counts as business travel. If that location is your permanent workplace, the journey is commuting.

Technology, equipment, and software

Computers, laptops, monitors, phones, tablets, printers, and any other equipment used for business purposes are deductible. If the item costs less than your company's de minimis threshold for capitalisation (many small companies use £500 or £1,000), you can expense it directly. Higher-value items are typically treated as capital expenditure and claimed through capital allowances (covered below).

Software subscriptions — accounting packages (Xero, QuickBooks, FreeAgent), project management tools, cloud storage, email hosting, website hosting, and domain registrations — are all fully deductible revenue expenses. So are one-off software licences used for business.

The dual-use trap: if a director uses a company laptop partly for personal use (streaming, personal email, family photos), HMRC can technically challenge the deduction. In practice, HMRC accepts that incidental personal use of a business computer does not disqualify the expense — but if the "personal use" is the primary use, the expense fails the wholly-and-exclusively test.

Professional services and fees

Fees paid to accountants, solicitors, tax advisers, and bookkeepers for business-related work are fully deductible. This includes:

• Annual accounts preparation and Corporation Tax return filing
• VAT return preparation (if VAT-registered)
• Payroll processing
• Legal fees for commercial contracts, employment law, or IP protection
• Companies House filing agent fees (e.g. confirmation statement filing, director appointments, PSC notifications)
• Regulatory or professional body subscriptions relevant to the trade

Legal fees for personal matters — divorce proceedings, personal property disputes, personal immigration — are not deductible even if paid through the company. Legal fees for setting up the company itself (formation costs) are allowable.

Marketing and advertising

Website design and development, SEO, PPC advertising, social media advertising, printed materials (business cards, brochures, flyers), trade show exhibition costs, PR agency fees, and email marketing platform subscriptions are all deductible. So are gifts to clients, provided the gift costs no more than £50 per person per year, carries a conspicuous advertisement for the company, and is not food, drink, or tobacco (or a voucher exchangeable for those).

Insurance

Business insurance premiums are deductible. Common policies include:

• Professional indemnity insurance
• Public liability insurance
• Employers' liability insurance (legally required if you have employees)
• Cyber insurance
• Key person insurance — deductible if taken out to protect the company's trading income, not as an investment vehicle
• Contents and equipment insurance

Director's personal insurance (life insurance, income protection, private health insurance) paid by the company is generally treated as a benefit in kind and reported on form P11D, with employer's NIC payable via a P11D(b). It's still deductible for the company as a staff cost, but it creates a personal tax charge for the director.

Bank charges and finance costs

Business bank account fees, transaction charges, overdraft interest, and loan interest (where the loan was taken out for business purposes) are all deductible. Credit card fees and merchant processing fees for taking customer payments are also allowable.

Interest on a director's loan to the company is deductible for the company, but the director must declare the interest as personal income. The company must also deduct basic-rate income tax at source (20%) and pay it to HMRC via form CT61.

Training and professional development

Training courses, conferences, workshops, and professional qualifications are deductible if they update or maintain existing skills relevant to the business. A qualified accountant attending a tax-update seminar? Deductible. A software developer taking an advanced course in a programming language they already use? Deductible.

Training that equips someone with entirely new skills unrelated to the current trade is more problematic. A marketing director doing an MBA might be challenged if HMRC considers it personal career development rather than a business necessity. The key question is always: is the training to maintain and enhance existing capabilities, or to acquire a new qualification for personal benefit?

Capital allowances: claiming for big-ticket equipment

When your company buys a significant asset — machinery, equipment, a commercial vehicle, office furniture — the cost isn't deducted as a revenue expense in one go. Instead, it's claimed through the capital allowances system, which spreads or accelerates the tax relief depending on the type of asset.

Annual Investment Allowance (AIA)

The AIA lets your company deduct 100% of the cost of qualifying plant and machinery in the year of purchase, up to £1 million per year. For the vast majority of small and medium-sized companies, the AIA covers every capital purchase you'll make. It applies to most plant and machinery — desks, servers, manufacturing equipment, tools — but not to cars, items given to you, or assets you owned personally before transferring them to the company.

If your accounting period is shorter than 12 months, the £1 million limit is reduced proportionally. A nine-month period gives you a £750,000 AIA.

Writing down allowances (WDA)

Assets that don't qualify for the AIA — or where you choose not to use it — go into a capital allowances pool and are written down at a percentage each year:

• Main rate pool (18% per year): most plant and machinery, office equipment, commercial vehicles
• Special rate pool (6% per year): long-life assets (useful life over 25 years), integral features of buildings (lifts, heating systems, electrical systems), and cars with CO₂ emissions above 50g/km

Cars: special rules

Company cars are excluded from the AIA entirely. Instead, the tax treatment depends on CO₂ emissions:

• 0g/km (fully electric): 100% first-year allowance — the entire cost is deductible in year one
• 1–50g/km: main rate pool (18% WDA per year)
• Over 50g/km: special rate pool (6% WDA per year)

Remember that a company car also creates a benefit in kind (BIK) for the director or employee who uses it, with the tax charge based on the car's list price and CO₂ emissions. Electric vehicles have a very low BIK rate (2% for 2024/25, 3% for 2025/26, and 4% for 2026/27, rising by 1 percentage point a year), which is why they're often the most tax-efficient choice for company cars.

Expenses you cannot claim

The following are commonly misunderstood. None of these pass the "wholly and exclusively" test:

• Business entertaining and hospitality. Taking a client to lunch, buying drinks at a networking event, hosting a client dinner — none of this is deductible for Corporation Tax, even though it feels like an obvious business expense. The only exception is staff entertaining (e.g. a Christmas party costing no more than £150 per head per year, which is tax-free for employees).
• Clothing that isn't a uniform or protective equipment. A suit worn for client meetings is not deductible. A branded polo shirt with the company logo, or steel-toed boots for a construction site, is.
• Fines and penalties. Parking fines, speeding tickets, HMRC penalties, and Companies House late-filing penalties are not deductible. They are a personal or regulatory cost, not a trading expense.
• Personal expenses paid through the company. Groceries, personal holidays, personal gym memberships, home furniture (unless for a dedicated home office), and personal phone contracts. If the company pays for these, they become a benefit in kind or — worse — an overdrawn director's loan account, which triggers a s. 455 tax charge of 35.75% on the outstanding balance (for loans made on or after 6 April 2026).
• Donations to political parties. Charitable donations to registered charities can be deducted, but political donations cannot.
• Capital repayments on loans. Only the interest is deductible, not the principal repayment.

The director's loan account trap

One of the most expensive mistakes a founder-director can make is treating the company bank account as a personal one. Every time you take money out of the company that isn't salary, dividends, or a reimbursement of a genuinely incurred business expense, it goes onto your director's loan account (DLA).

If the DLA is overdrawn at the end of the accounting period — meaning you owe the company money — three things happen:

1. The company pays s. 455 tax of 35.75% on the outstanding balance for loans made on or after 6 April 2026 (this is repaid to the company if you clear the loan within nine months and one day of the accounting period end, but it ties up cash).
2. You may owe benefit-in-kind tax if the loan exceeds £10,000 and no interest (or below-market interest) is being charged. The taxable benefit is calculated using HMRC's official interest rate.
3. HMRC may reclassify the withdrawal as disguised remuneration, triggering income tax, NICs, and potentially penalties.

The fix is straightforward: maintain clear separation between business and personal spending, record every expense with a receipt, and process reimbursements through your payroll or accounting software rather than simply withdrawing cash. If you're a director-shareholder wanting to extract profits, the two legitimate routes are salary and dividends.

Five common mistakes that trigger HMRC enquiries

HMRC uses data analytics to flag Corporation Tax returns that look unusual. These are the patterns most likely to draw attention:

1. Travel and subsistence claims that are disproportionately high. If your company has one director, no employees, and claims £8,000 a year in travel expenses, HMRC will want to understand why. Keep mileage logs and receipts for every journey.
2. Flat-rate deductions without a formal agreement. The £6/week use-of-home allowance is simple, but the company should have a written agreement or board minute authorising it. Without one, it can be challenged.
3. Missing or inadequate records. Under s. 386 of the Companies Act 2006, your company must keep accounting records sufficient to show and explain its transactions. Records must be retained for at least six years from the end of the accounting period. "I lost the receipts" is not a defence.
4. Claiming entertainment as "marketing." Relabelling a client dinner as a "marketing event" does not change its nature. HMRC looks at the substance of the expense, not the label in your accounting software.
5. Large one-off purchases at the year end. Buying a £5,000 laptop on the last day of your accounting period, when you've never previously spent more than £800 on technology, will be noticed. The timing doesn't make it disallowable — but it will invite questions.

How to keep your expense records HMRC-ready

Good record-keeping is both a legal obligation and your best defence in an enquiry. Here's the system that works for most small limited companies:

1. Use cloud accounting software. Xero, QuickBooks, or FreeAgent — all let you photograph receipts on your phone, match them to bank transactions, and categorise expenses as you go. This is faster than a shoebox of receipts and dramatically more reliable.
2. Separate business and personal banking. A business bank account is not legally required for a UK limited company, but it's practically essential. It makes every transaction auditable and eliminates the risk of personal spending contaminating your director's loan account.
3. Capture receipts immediately. A receipt captured on the day is credible. A "reconstructed" expense claimed months later without a receipt is not. Most accounting apps let you snap a photo and auto-extract the amount, date, and VAT.
4. Record the business purpose. For every expense over a trivial amount, note what it was for. "Client meeting — Project Atlas kickoff" is better than "lunch." This takes seconds and saves hours if HMRC ever asks.
5. Reconcile monthly. Don't wait until your year-end. Monthly bank reconciliation catches errors, duplicate claims, and personal transactions before they compound into a problem.

Corporation Tax: where expenses fit into the bigger picture

Your allowable expenses feed directly into your Corporation Tax calculation. Here's the timeline every limited company director should know:

• Corporation Tax registration is required within three months of starting business activity — not three months of incorporation. "Business activity" means invoicing, signing contracts, advertising, employing staff, or earning interest. If you've incorporated but aren't yet trading, the clock hasn't started.
• Corporation Tax payment is due nine months and one day after the end of your accounting period.
• Your CT600 return is due 12 months after the end of your accounting period.
• Late filing penalties start at £200 and climb with each milestone: an additional £200 at three months, 10% of unpaid tax at six months, and a further 10% at 12 months. File three returns late in a row and the fixed penalties increase to £1,000 each.

The Corporation Tax rates for profits from 1 April 2023 onward are:

• 19% small profits rate — for companies with taxable profits of £50,000 or less
• 25% main rate — for companies with profits over £250,000
• Marginal relief — for profits between £50,000 and £250,000, giving an effective rate between 19% and 25%

These thresholds are divided by the number of associated companies you control, so if you run two limited companies, the small profits threshold drops to £25,000 each.

For a deeper look at registration and the Corporation Tax registration process, see our dedicated guide. And if you're wondering about the full picture of running costs, that guide breaks down every annual expense beyond tax.

VAT and expenses: what changes when you're VAT-registered

If your company is VAT-registered (mandatory once taxable turnover exceeds £90,000 in any rolling 12-month period), you can reclaim the VAT on most business purchases through your VAT return. This effectively makes your allowable expenses even cheaper — a £1,200 laptop becomes £1,000 plus £200 recoverable VAT.

However, there are expenses where VAT cannot be reclaimed:

• Business entertaining (no VAT recovery, matching the Corporation Tax position)
• Cars (unless used exclusively for business, with no private use whatsoever — a test almost no director-owned car passes)
• Goods or services for personal use
• Anything purchased before VAT registration (though there's a partial exception for goods still held at the registration date, if bought within the preceding four years)

If you use the VAT Flat Rate Scheme, you pay a fixed percentage of gross turnover to HMRC and don't reclaim VAT on individual purchases (except capital assets over £2,000). The Flat Rate Scheme simplifies bookkeeping but can mean you pay more VAT than you would on the standard scheme, depending on your expense profile.

Frequently asked questions

Can I claim for a home office desk, chair, and monitor?

Yes — if you work from home regularly and the equipment is used for business purposes. The company buys the equipment, claims it as a business expense, and the item remains company property. If the item costs under your capitalisation threshold, it's a revenue expense; above it, claim through capital allowances (the AIA will almost certainly cover it). There's no benefit-in-kind charge provided the equipment is used mainly for business.

Is a mobile phone contract a business expense?

If the contract is in the company's name and the phone is provided to the director or employee for business use, the full cost is deductible and there's no BIK charge — even if some personal calls are made on it. This is a specific statutory exemption. However, if the contract is in the director's personal name and the company reimburses it, only the business-use portion is deductible, and the personal portion is a benefit in kind.

Can my limited company pay for my professional subscription?

Yes, if the professional body is on HMRC's List 3 of approved professional organisations or the subscription is relevant to your role. Examples include ICAEW, ACCA, the Law Society, BCS, RICS, and hundreds of others. The company claims the deduction; there's no BIK for the employee. If the body isn't on List 3, the payment may still be deductible for the company but will be treated as a taxable benefit for the individual.

What happens if HMRC disallows an expense?

If HMRC decides an expense was not "wholly and exclusively" for business purposes, the deduction is reversed: your taxable profit increases by the amount of the disallowed expense, and you pay the additional Corporation Tax plus interest from the original due date. If HMRC considers the claim to have been careless or deliberate, penalties of 0–100% of the underpaid tax can apply on top.

Do I need to keep paper receipts?

HMRC accepts digital records, including photographs of receipts stored in cloud accounting software. You do not need to keep the paper original, provided the digital copy is legible and includes the date, amount, VAT (if applicable), and what the expense was for. The key requirement is that records are kept for at least six years.

Can a dormant company claim expenses?

A dormant company that incurs costs (registered office fees, filing agent fees, domain renewals) can still record those expenses. However, since a dormant company has no trading income, there's no Corporation Tax liability to reduce. The expenses carry forward and can be set against future profits if the company becomes active again.