Allowable Expenses for the Self-Employed: UK Guide

Becoming self-employed often begins with a skill, an opportunity or the determination to work independently. It rarely begins with excitement about tax rules and expense categories.

Many sole traders either claim too little because they are afraid of making a mistake or claim everything that passes through the business account without checking whether HMRC allows it. Both approaches can create problems.

Missing legitimate expenses can leave you paying more tax than necessary. Claiming personal or unsupported costs can produce an inaccurate Self Assessment return and potentially lead to HMRC questions or penalties.

The good news is that most everyday expenses can be understood using one basic principle: the cost must genuinely relate to running your business, and you must be able to explain and support the amount claimed.

What Is an Allowable Expense?

An allowable expense is a business cost that can be deducted when calculating your taxable self-employed profit.

Suppose your annual turnover is £40,000 and you have £10,000 of allowable expenses. Your taxable trading profit would generally begin at £30,000 rather than £40,000.

That does not mean HMRC refunds the complete £10,000. The expenses reduce the profit on which Income Tax and, where applicable, National Insurance are calculated.

HMRC’s self-employed expense guidance confirms that sole traders and individual partners can deduct allowable running costs when calculating taxable profit.

Expenses do not include money withdrawn from the business for your personal use. Paying yourself £1,500 from the business account does not create a £1,500 tax deduction.

The Basic Test: Is It Really for the Business?

A cost must normally have a genuine business purpose.

Some expenses are entirely business-related. Stock purchased for resale, professional indemnity insurance and wages paid to an employee doing genuine work are straightforward examples.

Other expenses have both business and personal use. A mobile telephone, internet connection, car or home electricity bill may fall into this category. In many cases, a reasonable business proportion can be claimed.

However, not every mixed-purpose cost can be divided. Ordinary clothing and everyday meals remain personal in nature even when they help you appear professional or allow you to continue working.

The description on the receipt does not decide the tax treatment. A purchase made using a business debit card is not automatically an allowable expense, just as a business cost paid personally does not automatically become disallowed.

Expenses Reduce Profit—They Do Not Make Purchases Free

A common misunderstanding is that something becomes “free” because it is tax-deductible.

If a sole trader spends £1,000 on an allowable business cost, their taxable profit may fall by £1,000. The actual tax saved will be a proportion of that amount, depending on their Income Tax and National Insurance position.

Spending £1,000 solely to save a few hundred pounds of tax does not make the business wealthier. The purchase should still be commercially necessary or useful.

Good tax planning means claiming every legitimate cost the business has genuinely incurred—not buying unnecessary items before 5 April simply to create a deduction.

Cash Basis or Traditional Accounting?

The timing and treatment of an expense can depend on the accounting method used.

Cash-basis accounting is now the default method for many sole traders and eligible partnerships. Under cash basis, income is generally recorded when received and expenses when paid.

Traditional accounting records income when earned and expenses when incurred, even where the money is collected or paid later. It also requires consideration of debtors, creditors, stock and work in progress.

HMRC’s self-employed accounting-method guidance confirms that cash basis became the default from the 2024/25 tax year unless the business opts out or cannot use it.

Before deciding what to claim, you should therefore know which accounting method applies. Mixing the two approaches can place income and expenses in the wrong tax year.

The £1,000 Trading Allowance

Individuals can receive a trading allowance of up to £1,000 each tax year.

If your total gross trading income from one or more trades is £1,000 or less, you may not need to report it to HMRC, although exceptions apply and records must still be retained.

Where gross trading income exceeds £1,000, you may be able to deduct the trading allowance instead of your actual expenses.

You cannot claim the £1,000 trading allowance and deduct your normal business expenses against the same income. If your genuine allowable expenses total £3,500, claiming those costs will generally be more beneficial than taking the £1,000 allowance.

The allowance is normally shared across your eligible trading and casual income; it is not a fresh £1,000 allowance for every side business.

HMRC’s trading-allowance guidance explains that individuals with income above £1,000 can choose between the allowance and their actual deductible expenses.

Office Costs and Everyday Administration

Most ordinary office costs used for the business can be claimed.

These may include stationery, printing, postage, printer ink, telephone charges, business software, cloud subscriptions and smaller office supplies.

A laptop, computer or printer may also qualify, although its treatment depends on whether you use cash basis or traditional accounting.

If the equipment is used privately as well as for business, only the business proportion should be claimed. For example, if a laptop is used 80% for client work and 20% personally, the claim should normally reflect the 80% business use.

HMRC’s office and equipment guidance confirms that business telephone, internet, stationery, printing and software costs may qualify.

Mobile Telephone and Internet Bills

A sole trader can claim the business part of telephone and internet expenses.

If you have a separate mobile contract used exclusively for the business, the complete cost may be easier to support. Where a personal contract is also used for business calls, data and messages, a reasonable proportion should be calculated.

Simply claiming 50% because it feels fair is not always sufficient. The percentage should be based on actual usage, itemised bills or another reasonable method.

Buying a telephone through the business does not make private use disappear. The same principle applies to home broadband.

Keeping business and personal contracts separate can make the expense easier to calculate and defend.

Working From Home

A sole trader working from home may claim a reasonable proportion of relevant household costs.

These can include heating, electricity, Council Tax, rent, mortgage interest, internet and telephone use. The claim should reflect the space used and the amount of time it is used for business.

For example, someone using one of four similar rooms as an office may begin by identifying one-quarter of the relevant cost. If that room is used for business only part of the week, the amount should be reduced further.

Be cautious about describing a room as used exclusively for business, particularly if you own the property. Exclusive business use can potentially affect other taxes and reliefs when the home is eventually sold. Occasional private use may avoid the room being treated as exclusively business accommodation, although the facts must be genuine.

Simplified Home-Working Expenses

Instead of calculating the actual household costs, eligible sole traders can use simplified home-working expenses.

If you work from home for between 25 and 50 hours in a month, the flat rate is £10. For 51 to 100 hours, it is £18. For 101 hours or more, it is £26.

The flat rate does not include telephone or internet costs. You can still calculate and claim the business proportion of those bills separately.

HMRC’s simplified home-working guidance confirms the current rates and the minimum 25-hour requirement.

Simplified expenses are convenient, but they do not always create the largest deduction. Someone with substantial home-running costs may receive a greater claim by calculating the actual business proportion.

Business Premises

If you rent an office, workshop, shop, studio or warehouse for your business, the relevant premises costs may be allowable.

These can include rent, business rates, utilities, security, cleaning and property insurance.

The purchase price of the premises is not an ordinary business expense. Mortgage capital repayments are also not deductible as running costs, although qualifying business-loan interest may be considered separately.

Where part of the premises is used privately, the claim must exclude the private element.

Special simplified-expense rules are available for certain people who live at their business premises, such as the owner of a guesthouse or bed and breakfast.

Cars, Vans and Business Mileage

Vehicle costs are one of the most misunderstood areas of allowable expenses self employed people can claim.

You can generally use either your actual business vehicle costs or simplified mileage expenses, subject to the relevant conditions.

Actual costs may include fuel, insurance, repairs, servicing, vehicle tax, breakdown cover and hire charges. If the vehicle is also used privately, these costs must be restricted to the business proportion.

Alternatively, simplified mileage allows you to claim a flat rate for each qualifying business mile.

For the 2026/27 tax year, the simplified mileage rate for cars and goods vehicles is 55p per mile for the first 10,000 business miles and 25p per mile thereafter. The motorcycle rate remains 24p per business mile.

The first car-and-van rate increased retrospectively from 45p to 55p from 6 April 2026. HMRC’s simplified vehicle-expense guidance confirms the current rates.

Once you begin using simplified mileage for a particular vehicle, you must normally continue using that method for as long as the vehicle remains in the business. You cannot also claim fuel, insurance, servicing and other running costs for that same vehicle.

Parking and other qualifying travel costs can generally be claimed separately.

What Counts as Business Mileage?

Business mileage generally means journeys undertaken for business purposes.

Driving from your workplace to visit a customer, supplier, temporary site or training event may qualify. Travel between different customers or jobs can also qualify.

Ordinary travel between your home and a permanent workplace normally does not qualify. Calling your journey “business travel” in a mileage log does not change its underlying purpose.

The position can become complicated where the business is operated from home, the work is itinerant or the sole trader attends several changing sites.

A mileage record should include the date, destination, business purpose and distance travelled. A year-end estimate based solely on fuel receipts is unlikely to provide an accurate record of business mileage.

Public Transport, Hotels and Overnight Travel

Train, bus, taxi, tram and air fares can be allowable where the journey is genuinely for business.

Hotel accommodation may also qualify where an overnight stay is required for business travel. Associated meals may be allowable in appropriate circumstances.

HMRC’s business travel guidance includes public transport, hotels and meals on overnight business trips among potentially allowable costs.

Personal sightseeing, extending a trip for a holiday or paying for a spouse who has no business purpose will not normally be deductible. Where a journey has both business and private elements, the expenditure should be reviewed carefully rather than claiming the complete trip automatically.

Travel fines and penalties are not allowable, even where the journey itself was for business.

Can You Claim Food and Coffee?

Your ordinary meals are generally personal expenses because everyone needs to eat, whether they are working or not.

Buying lunch while completing a normal working day does not become tax-deductible simply because you ate at your desk or discussed work during the meal.

Meals may qualify where they form part of allowable business travel, such as an overnight trip or qualifying journey outside the normal working pattern. Different rules can also apply to itinerant trades.

Client entertainment is different. Taking a customer or supplier to lunch is generally not an allowable sole-trader tax deduction, even where there is a genuine commercial purpose.

Keeping the receipt does not change the tax treatment.

Clothing and Workwear

You can generally claim for uniforms, protective clothing required for work and costumes used by actors or entertainers.

Examples might include safety boots, high-visibility clothing, protective gloves, medical uniforms or branded uniforms that clearly identify the business.

Ordinary clothing cannot normally be claimed, even if it is purchased exclusively for work.

A consultant cannot usually claim a business suit merely because it is worn only at client meetings. A personal trainer cannot automatically claim ordinary sportswear. The clothing remains capable of normal personal use.

HMRC’s clothing-expense guidance confirms that everyday clothes are not deductible even when worn for work.

Stock, Materials and Goods for Resale

Businesses selling products can generally claim the cost of stock, raw materials and direct production costs.

A builder might claim materials used on customer projects. A retailer can claim goods purchased for resale, while a maker may claim materials incorporated into the finished product.

Items withdrawn for private use must be excluded or adjusted appropriately.

Under traditional accounting, unsold stock and work in progress at the year-end must normally be considered when calculating profit. Purchasing £20,000 of stock shortly before the year-end does not necessarily create an immediate £20,000 deduction if much of it remains unsold.

HMRC’s goods-for-resale guidance confirms that stock, raw materials and direct production costs may qualify, but private purchases and depreciation do not.

Employees and Subcontractors

A sole trader can normally claim genuine staffing costs.

These may include employee wages, bonuses, employer’s National Insurance, workplace pension contributions, agency fees, employee benefits and payments to subcontractors.

The business must still comply with PAYE, National Minimum Wage, workplace-pension and employment-status obligations.

Paying a spouse, child or other relative can be allowable where they genuinely work for the business and the amount is commercially reasonable for the duties performed. The arrangement should be properly documented, with payments actually made and PAYE operated where required.

Calling someone a subcontractor in the bookkeeping records does not determine their employment status. The working relationship must support that classification.

HMRC lists salaries, pensions, agency fees and subcontractor costs among the allowable staff expenses.

Advertising, Marketing and Website Costs

Advertising and marketing costs will commonly be allowable where they promote the existing business.

These might include social-media advertising, search advertising, website hosting, design services, brochures, printed materials, directory listings and free product samples.

Sponsorship can potentially qualify where it provides a genuine commercial benefit, such as advertising the business. A payment described as sponsorship may not qualify where its real purpose is personal generosity or a charitable donation.

Client entertaining and event hospitality are normally disallowed. Most business gifts are also excluded, although limited exceptions can apply.

HMRC’s marketing and entertainment guidance confirms that advertising, free samples and website costs can qualify, while entertaining customers and suppliers does not.

Accountancy, Legal and Professional Fees

Fees paid to an accountant, solicitor, surveyor or other professional may be allowable where the work relates to the business.

The cost of preparing business accounts and providing business tax advice can generally qualify. However, the personal cost of preparing and submitting the sole trader’s Self Assessment return is not itself an allowable business expense.

Where an accountant’s invoice covers both business accounts and personal tax work, the fee may need to be divided.

Legal costs connected with purchasing property or machinery are not usually ordinary revenue expenses. They may form part of the asset’s capital cost or receive different tax treatment.

Professional indemnity insurance, public liability insurance and other policies taken out for the business can generally qualify.

HMRC’s legal and financial expense guidance explains which professional fees and insurance costs may be claimed.

Bank Charges, Interest and Finance

Business bank fees, overdraft charges, card-processing fees and qualifying interest on business borrowing may be allowable.

The capital element of a loan repayment is not an expense. Borrowing £10,000 and repaying that £10,000 does not reduce taxable profit. The qualifying interest and finance charges may be considered separately.

Where a loan has both business and personal purposes, only the relevant business element should be claimed.

Payments for fines or legal penalties remain disallowed, even where paid from the business bank account.

Training Courses

Training costs can qualify where they update or improve skills used in the existing business.

A designer learning updated software, an electrician completing an industry refresher course or a sole trader learning administrative skills to manage the existing business may be able to claim the cost.

Training that prepares you to start an entirely new trade or expand into an unrelated industry will not normally qualify as an expense of the current business.

HMRC’s self-employed training guidance confirms that training related to existing skills, industry changes and business administration may be allowable.

The commercial purpose and relationship to the current trade should be documented.

Professional Subscriptions

Subscriptions to relevant trade bodies, professional organisations and industry journals can often be claimed.

The organisation must relate to the business or profession. A general gym membership, political-party subscription or unrelated club membership is not converted into a business expense because networking occasionally takes place there.

Software subscriptions should normally be recorded separately from professional memberships, although both may qualify when genuinely used for the business.

Equipment, Computers and Machinery

The treatment of equipment depends on the accounting method.

Under cash-basis accounting, most equipment purchased and kept for the business—such as computers, printers and machinery—is generally claimed as an ordinary allowable expense. Cars are treated differently and may qualify for capital allowances where simplified mileage is not used.

Under traditional accounting, equipment and machinery are normally considered through capital allowances rather than being deducted as ordinary running expenses. In many cases, the Annual Investment Allowance can provide a complete deduction for qualifying plant and machinery.

The purchase of land, buildings and certain long-life or non-depreciating assets follows different rules.

HMRC’s capital-allowance guidance explains the treatment of plant and machinery and confirms that cash-basis sole traders generally claim capital allowances only for business cars.

Costs Incurred Before the Business Started

Some costs paid before the official start of trading may still qualify.

Revenue expenditure incurred within seven years before the trade began can potentially be treated as incurred on the first day of trading, provided it would have been allowable if paid after the business started.

Examples might include appropriate insurance, advertising, professional fees or other preparatory costs incurred specifically for the eventual trade.

The cost must still meet the normal business-purpose test. Personal research, general education and expenditure for a business that never begins will not automatically qualify.

HMRC’s pre-trading expenditure guidance confirms the seven-year period and the requirement that the cost would have been allowable after commencement.

Bad Debts

The treatment of unpaid customer invoices depends on the accounting method.

Under traditional accounting, an invoice may already have been included in turnover even though the customer has not paid it. If the debt becomes genuinely irrecoverable, an allowable bad-debt deduction may be available.

A general estimate that a percentage of all customers will fail to pay is not sufficient. The particular debt should be identified and there should be reasonable evidence that it will not be recovered.

Under cash-basis accounting, unpaid invoices have not normally been included in income. There is therefore no separate bad-debt expense to claim.

HMRC explains this distinction in its financial-cost guidance.

Costs You Normally Cannot Claim

Personal drawings are not expenses. Income Tax and National Insurance paid personally are not business deductions. Capital repayments on loans are not allowable, although relevant interest may qualify.

Ordinary commuting, non-business travel, everyday clothes, most client entertainment, most gifts, fines and penalties are also generally excluded.

The cost of preparing the personal Self Assessment return is not allowable, although the business-accounting element of an accountant’s fee may be.

Charitable donations are not normally deducted as sole-trader business expenses. Separate personal tax relief may apply to qualifying Gift Aid donations, but that is not the same as recording the payment as an ordinary business cost.

Claiming an expense because “everyone in the industry does it” is not a defence if the cost does not meet the tax rules.

What If an Expense Has Business and Personal Use?

Mixed-use expenses should normally be divided using a reasonable and consistent method.

For a mobile telephone, the split might be supported by call and data usage. For a vehicle, mileage records can establish the business proportion. Home-working costs may be allocated using rooms, floor area and working time.

The method does not need to be unnecessarily complex, but it should reflect the circumstances.

Avoid claiming round percentages with no explanation. If HMRC asks how the 70% business-use figure was calculated, you should be able to show the underlying reasoning.

The private proportion should be excluded even where the complete payment came from the business account.

Do VAT-Registered Sole Traders Claim the VAT-Inclusive Amount?

The answer depends on how the records are maintained and whether the VAT can be recovered.

Where input VAT is fully reclaimable through the VAT Return, the expense is generally considered net of that recoverable VAT when calculating taxable profit. If the business is not VAT registered, the VAT forms part of the amount paid and may be included in the expense.

Cash-basis businesses can choose to maintain their Income Tax records including or excluding VAT, but they must use the chosen approach consistently and treat VAT payments and repayments accordingly.

Special VAT schemes and partially exempt businesses may need additional adjustments.

Keep Evidence for Every Claim

You do not normally send expense receipts to HMRC with the Self Assessment return, but that does not mean evidence is optional.

Retain purchase invoices, receipts, contracts, mileage logs, bank statements, subscription confirmations and calculations supporting mixed-use expenses.

A bank statement proves that money was paid, but it may not establish what was purchased or why it related to the business. The corresponding invoice or receipt provides the missing detail.

Self-employed business records generally need to be retained for at least five years after the 31 January filing deadline for the relevant tax year. HMRC’s record-retention guidance explains the minimum period and the rules for lost or destroyed documents.

Digital receipt capture can make record-keeping easier, but the image should remain readable and securely accessible after changing software or accountant.

Making Tax Digital Changes the Record-Keeping Process

Making Tax Digital for Income Tax became mandatory from 6 April 2026 for qualifying sole traders and landlords with combined gross self-employment and property income above £50,000.

Affected individuals need compatible software to maintain digital records, send quarterly updates and finalise their Income Tax position.

The threshold reduces to qualifying income above £30,000 from April 2027 and above £20,000 from April 2028.

Importantly, qualifying income is measured before expenses. Claiming substantial deductions does not reduce the gross-income figure used to determine whether MTD applies.

HMRC’s Making Tax Digital for Income Tax guidance explains the digital-record and reporting obligations.

Common Expense-Claim Mistakes

One common mistake is claiming the complete cost of something with significant private use. Another is overlooking expenses paid personally because they do not appear in the business bank account.

Sole traders may also claim both simplified mileage and actual vehicle-running costs, use the £1,000 trading allowance alongside normal expenses or treat loan repayments as deductions.

Other errors include claiming everyday clothing, ordinary lunches, client entertaining or equipment incorrectly. Some people claim no home-working costs even though they operate almost entirely from home.

The safest approach is not to claim everything or nothing. Each expense should be reviewed according to its purpose, supporting evidence, private use and the accounting method applied.

How SAS Yorkshire Can Help

SAS Yorkshire helps sole traders understand exactly which expenses relate to their business and how they should be recorded.

The team can review bank transactions, receipts, mileage records, home-working calculations, equipment purchases and mixed-use costs. This ensures that legitimate deductions are not missed while personal or unsupported expenditure is excluded.

SAS Yorkshire can also compare the trading allowance with actual expenses, determine whether cash basis or traditional accounting is more appropriate and assess whether Making Tax Digital applies.

Regular bookkeeping provides a clearer view of taxable profit throughout the year, while professionally prepared Self Assessment returns reduce the risk of rushed estimates and incorrect claims.

Whether you are a tradesperson in Batley, consultant in Leeds, online seller in Bradford, freelancer in Wakefield or another self-employed professional elsewhere in Yorkshire, clear advice can help you claim confidently.

Claim What You Are Entitled to And Keep the Evidence

Allowable expenses are not loopholes or favours from HMRC. They are the legitimate costs of earning your business income.

The challenge is separating genuine business expenditure from personal spending and applying the correct treatment to mixed-use costs, vehicles, equipment and home working.

For anyone researching sole trader tax deductions UK, the most important habit is to record expenses when they occur. Trying to remember an entire year of purchases shortly before the Self Assessment deadline usually results in missed deductions and weak evidence.

Contact SAS Yorkshire for a personalised sole-trader expense review. The team can organise your records, identify legitimate claims and prepare an accurate Self Assessment return based on your actual business circumstances.

This article provides general information based on the 2026/27 rules. The treatment of an expense depends on its purpose, the accounting method and the individual business circumstances.

Frequently Asked Questions

1. Can I claim an expense if I paid for it from my personal bank account?

Yes, provided the expense was genuinely incurred for the business and you retain appropriate evidence. Record it in the business accounts as an expense paid personally. Using a personal account does not prevent a valid claim, although a separate business account makes record-keeping easier.

2. Can I claim both the £1,000 trading allowance and my actual expenses?

No. If you use the trading allowance against your self-employed income, you cannot also deduct normal expenses or capital allowances against the same income. Compare the allowance with your actual eligible costs and use the method that produces the appropriate result.

3. Can a sole trader claim food and coffee?

Ordinary meals and drinks consumed during a normal working day are generally personal and cannot be claimed. Reasonable food costs may qualify when connected with allowable business travel, an overnight business trip or certain itinerant work. Client entertaining is normally disallowed.

4. Can I claim the cost of my car as self-employed?

Potentially. You may use simplified mileage or claim the appropriate business proportion of actual vehicle costs, subject to the rules. Cars purchased for the business may qualify for capital allowances where simplified mileage is not used. You cannot claim both mileage and actual running costs for the same vehicle.

5. Do I need receipts for every self-employed expense?

You need reliable evidence supporting your expense claims. This may include receipts, invoices, bank statements, mileage logs, contracts and digital payment records. A missing receipt does not automatically make every cost impossible to claim, but you should obtain replacement evidence and avoid relying on unsupported estimates.