Self-Employed Expenses UK: Complete List of Allowable Deductions

As a self-employed individual or sole trader in the UK, you can deduct allowable business expenses from your income before calculating tax. This reduces both your income tax and your National Insurance contributions. But claiming the wrong expenses — or failing to evidence the right ones — creates problems when HMRC enquires.

This guide covers every category of allowable expense, what you cannot claim, how to use simplified flat rates, how to keep records that satisfy HMRC, and how to enter expenses on your Self Assessment return.

Key Takeaways

• Expenses must be "wholly and exclusively" for business purposes — mixed-use items require apportionment
• Eleven main expense categories cover most self-employed costs, from premises to professional fees
• Simplified (flat rate) expenses replace actual cost calculations for home working, mileage, and living at your business premises
• Capital allowances apply to larger equipment purchases instead of standard expense deductions
• Records must be kept for five years after the 31 January Self Assessment deadline for the relevant tax year

What Counts as an Allowable Expense?

HMRC requires that expenses are incurred wholly and exclusively for the purposes of your trade. That is the legal test, and it operates in two ways.

Wholly and exclusively for business: If an expense is 100% for business — a domain name for your company website, a professional indemnity policy, an accountant's invoice — it is fully deductible. No apportionment needed.

Mixed use requires apportionment: If an expense has both a personal and a business element, you can claim only the business portion. A mobile phone used 60% for business and 40% personally: claim 60% of the bill. A broadband connection used half for work from home: claim 50%. The split must be reasonable and defensible if questioned.

What HMRC will challenge: expenses where no clear business purpose exists, expenses where the business element is negligible, and any cost that would exist even without the business. The "wholly and exclusively" test is applied per expense, not per category. Getting a receipt is step one; being able to explain the business purpose is step two.

Allowable Expense Categories

Office, Premises, and Property Costs

If you rent a dedicated business premises, the rent, business rates, utilities, water, and broadband are fully deductible. Repairs and maintenance to business premises are allowable; improvements (adding an extension, installing new windows) are not — those may qualify as capital allowances instead.

If you work from home, you have two options. The flat rate (£10/month for 25–50 hours of home working per month, £18/month for 51–100 hours, £26/month for over 100 hours) requires no calculations beyond a record of hours. The actual cost method lets you claim the business proportion of rent or mortgage interest, council tax, utilities, and broadband, based on the rooms and time used for work.

For most sole traders, the flat rate is simpler; for those with a dedicated home office, actual costs often yield a larger deduction. See our guide to working from home tax relief for the full calculation.

Receipt tip: Keep rent invoices, utility bills, and service charge statements. For home working, a record of monthly hours worked from home is sufficient for the flat rate.

Travel and Transport

Business travel — trips to clients, suppliers, professional events, or other business locations — is allowable. Commuting to a regular, fixed workplace is not.

If you use your own vehicle, you can claim the HMRC approved mileage rates: 45p per mile for the first 10,000 business miles in a tax year, 25p per mile thereafter. Motorcycles: 24p/mile. Bicycles: 20p/mile.

These rates cover fuel, insurance, MOT, and maintenance — you cannot also claim actual vehicle costs if you use the mileage rate. Alternatively, you can claim actual vehicle costs and apportion them between business and personal use. For most sole traders, the mileage rate is simpler and often more generous. See our full guide to HMRC mileage allowance rates.

Train, bus, taxi, and air fares for business trips are fully allowable. Parking for business trips is allowable; parking fines are not.

Receipt tip: Keep all public transport tickets and receipts. For vehicle use, maintain a mileage log recording the date, destination, purpose, and miles for each business journey. A mileage log is essential — without it, HMRC can disallow your vehicle claims.

Staff Costs

Employee salaries, employer National Insurance contributions, workplace pension contributions, bonuses, and benefits are all allowable. Payments to subcontractors and freelancers engaged for business purposes are also deductible.

If you employ staff, training costs for existing employees to update or maintain skills used in the business are allowable. The allowable cost is what you pay — not what your time is worth.

Receipt tip: Payroll records serve as your documentation. For subcontractors, keep their invoices. Payments to family members must reflect actual market rates — artificially high salaries to reduce tax are a known HMRC audit trigger.

Office Supplies and Equipment

Stationery, printer ink and cartridges, paper, postage, envelopes, and other consumable office supplies are fully deductible in the year purchased.

Small equipment — a desk lamp, a headset, a keyboard — is typically deductible as an expense. Larger purchases such as computers, desks, cameras, or machinery may qualify for capital allowances instead, allowing you to deduct the cost in the year of purchase through the Annual Investment Allowance.

Receipt tip: Keep till receipts for in-store purchases and order confirmations or PDF invoices for online purchases. For equipment, note the business purpose on the receipt if it is not obvious from the item description.

Software and Technology

Software subscriptions used for your business are fully deductible: accounting software, project management tools, design applications, communication platforms, cloud storage, security software, and expense tracking apps. Annual or monthly subscription fees, domain registration, web hosting, and app purchases all qualify.

One-off software licence purchases are also deductible in the year bought, provided the software is used wholly for business. If a subscription covers both business and personal use (a cloud storage account you also use for personal photos), apportion accordingly.

Receipt tip: Most software receipts arrive by email — forward them to a dedicated receipts folder or scan them into your expense app at the point of purchase.

Professional Fees

Accountant and bookkeeper fees, tax adviser fees, solicitor fees, architect fees, and surveyor fees engaged for business purposes are allowable. The cost of preparing your Self Assessment return is deductible in the year it is paid.

Legal fees for business contracts, debt recovery, or employment disputes are allowable. Legal fees connected to acquiring or disposing of a capital asset (buying business premises, settling a shareholder dispute) are generally not deductible as revenue expenses.

Receipt tip: Professional service invoices are your record. Keep the invoice and the corresponding payment (bank record or cheque stub).

Marketing and Advertising

Website design, development, and maintenance costs, online advertising (Google Ads, Meta Ads, LinkedIn Ads), business cards, brochures, flyers, signage, promotional materials, and directory listings are all allowable.

PR agency fees, press release distribution, and sponsored content for business purposes qualify. Samples provided to potential customers are allowable where the primary purpose is advertising rather than personal entertainment.

Receipt tip: Advertising platform invoices (Google, Meta, LinkedIn all generate monthly invoices) are clear proof of business purpose. For design work, keep the designer's invoice and brief.

Insurance

Business insurance premiums are allowable: professional indemnity insurance, public liability insurance, employers' liability insurance (mandatory if you have staff), product liability insurance, and contents insurance for business premises.

Personal life insurance, critical illness cover, and income protection are generally not deductible as business expenses. If your policy covers both business and personal elements, you can apportion the business portion.

Receipt tip: Your annual insurance schedule or renewal notice from your insurer serves as documentation. For monthly premiums, bank statement entries to a named insurer are usually sufficient.

Financial Costs

Business bank account fees and charges, business credit card annual fees, merchant service fees (Stripe, PayPal, SumUp, Square), and foreign currency conversion fees on business transactions are all deductible.

Interest on business loans and the interest element of hire purchase agreements is allowable — the capital repayment portion is not. If you use a personal loan for business purposes, only the interest is deductible and only the business-use proportion.

Receipt tip: Bank statements are self-evidencing for bank charges — the statement is its own record. For payment processing fees, monthly statements from your provider (Stripe dashboard export, PayPal monthly fee statement) are sufficient.

Training and Professional Development

Training costs that update or maintain skills you already use in your business are allowable. A web developer attending a course on a new framework, a physiotherapist completing required CPD hours, or a sole trader attending a bookkeeping workshop to manage their own accounts — all allowable.

Training to acquire an entirely new skill or qualification, or to enter a new profession, is not allowable as a business expense. If you are already a qualified accountant and take an advanced tax course, that is allowable. If you are a web developer who takes a medical qualification course, that is not.

Conference fees and registration costs for professional events in your field are allowable, as are relevant technical books and reference materials.

Receipt tip: Booking confirmation emails or event invoices. For books, the online order confirmation is sufficient.

Subscriptions and Memberships

Fees for professional body memberships directly relevant to your business are allowable: the Chartered Institute of Marketing, the British Medical Association, the Freelancer and Contractor Services Association, and similar. Industry trade association memberships qualify.

Relevant trade journals, technical publications, and industry newsletters are allowable. General-interest magazines and subscriptions with no direct connection to your business are not.

Receipt tip: Annual membership renewal invoices or subscription confirmation emails.

Simplified Expenses: The Flat Rate Alternative

HMRC offers simplified (flat rate) expenses for three categories of cost where calculating actual expenditure is complex. Using simplified expenses means you apply a fixed rate rather than working out the actual business proportion.

Working from home

This covers the additional household costs of working from home. You cannot claim a proportion of mortgage interest or council tax on top of the flat rate if you use it — it is one or the other. The flat rate is simpler; actual costs are sometimes larger. See our guide to flat rate expenses to compare.

Business mileage

The approved mileage rates (45p/mile, then 25p/mile after 10,000 miles) are the simplified expense for vehicles. If you use these rates, you cannot also claim fuel, insurance, MOT, or servicing separately.

Living at your business premises

If you live on business premises — a bed and breakfast you also live in, a flat above your shop — you can use a flat rate to adjust for the personal element rather than calculating the exact proportion. The rate depends on the number of occupants.

Capital Allowances: A Different Kind of Deduction

Not every business purchase is expensed in the year it is bought. Larger items — computers, cameras, machinery, tools, vehicles — typically qualify for capital allowances rather than being deducted as a regular expense.

The Annual Investment Allowance (AIA) lets you deduct 100% of qualifying plant and machinery costs in the year of purchase, up to £1,000,000. For most sole traders this means large equipment purchases are fully deductible in the year bought — the same practical result as expensing them, via a different HMRC mechanism.

If you do not use the AIA (or if you exceed the limit), you write down the cost over several years using Writing Down Allowances. See our full guide to capital allowances for the full picture, including which assets qualify, rates, and how to claim on your return.

What You Cannot Claim

Some costs feel business-related but HMRC does not allow them:

• Client entertainment — meals, drinks, events, and gifts for clients are not deductible for UK self-employed people. This is one of the most common errors on Self Assessment returns
• Everyday clothing — clothing you buy for work but could wear elsewhere fails the "wholly and exclusively" test. Uniforms, branded workwear, and protective clothing (hi-vis, safety boots, hard hats) are allowable
• Fines and penalties — parking fines, late payment surcharges, HMRC penalties, and speeding fines are not deductible
• Personal expenses — any cost you would incur regardless of your business: groceries, gym membership, personal phone contract
• Initial purchase of business premises — the capital cost of buying property is not a revenue expense. Capital allowances may cover fit-out and equipment costs, but not the property itself
• Depreciation — you cannot deduct the declining value of an asset as a business expense. Capital allowances cover this instead
• Dual-purpose expenses without apportionment — if an expense is partly personal and you claim 100%, HMRC can disallow it entirely

How to Evidence Your Expenses for HMRC

Claiming an expense and being able to prove it are two different things. HMRC can open an enquiry into any Self Assessment return and request documentation for any line item. The burden of proof is on you.

What you need for each expense: Every claimed expense needs a record showing what was bought, from whom, when, and how much was paid. A receipt, invoice, or order confirmation typically provides all of this. A bank statement shows the payment was made but not what was purchased — for most expenses, a statement alone is not sufficient. See our guide to using bank statements as receipts for HMRC for the specific cases where a statement does suffice.

Digital records are accepted: HMRC accepts photographs of paper receipts, PDF invoices, email order confirmations, and screenshots of online receipts — provided the image is legible and complete. You do not need to keep the paper original of an everyday business receipt if you have a clear digital copy. See our guide to business receipts: what you need to keep for the full picture on what a valid receipt must contain.

How long to keep records: Self-employed people must keep business records for five years after the 31 January Self Assessment deadline for the relevant tax year. For the 2025/26 tax year, that means keeping records until at least 31 January 2032.

Making Tax Digital: From April 2026, self-employed people with income above £50,000 must keep digital records and submit quarterly updates to HMRC using Making Tax Digital compatible software. The income threshold drops to £30,000 in April 2027 and £20,000 in April 2028. See our full guide to HMRC record-keeping requirements for everything you must keep and for how long.

How to Claim Expenses on Your Self Assessment Return

Business expenses are entered on the SA103 supplementary page (Self-Employment) of your Self Assessment return. You do not attach receipts to your return — you keep them and produce them only if HMRC opens an enquiry.

The SA103 uses these expense boxes:

• Box 17: Cost of goods bought for resale or goods used
• Box 18: Construction industry — subcontractor costs
• Box 19: Wages, salaries, and other staff costs
• Box 20: Car, van, and travel expenses
• Box 21: Rent, rates, power, and insurance costs
• Box 22: Repairs and renewals of property and equipment
• Box 23: Phone, fax, stationery, and other office costs
• Box 24: Advertising and business entertainment costs
• Box 25: Interest on bank and other loans
• Box 26: Bank, credit card, and other financial charges
• Box 27: Irrecoverable debts written off
• Box 28: Accountancy, legal, and other professional fees
• Box 29: Depreciation and loss on sale of assets
• Box 30: Other business expenses

If you are using the simplified expenses option for any category, enter the flat rate amount rather than actual costs. HMRC's guidance specifies which boxes each expense type belongs in. SparkReceipt's expense reports export a categorised summary you can use to populate these boxes directly.

Frequently Asked Questions

What expenses can I claim as self-employed in the UK?

You can claim any expense that is wholly and exclusively for your business, including office costs, travel, staff, software, professional fees, marketing, insurance, financial charges, training, and subscriptions. The full list with examples is in this guide. HMRC's self-employed expenses guidance is the authoritative source.

How much can I claim on expenses without receipts?

HMRC sets no threshold below which receipts become unnecessary. Any expense can be challenged without supporting documentation, regardless of how small it is. For very minor, obviously business-related costs, enquiry officers sometimes exercise discretion — but there is no formal de minimis rule you can rely on.

Can I claim expenses if I am employed and self-employed at the same time?

Yes. Your self-employed business expenses are claimed on the SA103 (self-employment) page of your return, completely separately from your employment income. You cannot claim your employed work expenses via your Self Assessment if they are not reimbursed by your employer — those follow a different route (employment expenses claim via P87 or your return's employment page).

What is the difference between simplified and actual expenses?

Simplified expenses apply a government flat rate (for home working, mileage, and living at your business premises) instead of calculating actual costs and apportioning them. They are simpler but not always larger. For home working especially, the actual cost method can produce a bigger deduction if you have a dedicated home office. You can switch between methods year by year for most categories.

Do I need a receipt for every business expense?

For every expense you claim, you need some record that establishes what was bought, from whom, and that it was for business. For most expenses, a receipt or invoice is the right record. For certain clearly business-purpose expenses — bank charges, direct debits to identifiable business suppliers — a bank statement entry can suffice. See our guide to business receipts for exactly what a valid record must contain.

How do I register expenses under Making Tax Digital?

Under MTD for Income Tax, you will submit quarterly summaries of income and expenses to HMRC using compatible software rather than one annual return. The expense categories stay the same as on the current SA103 — the difference is frequency and software requirement. You do not need to change how you categorise expenses; you need to capture them digitally as you go rather than collecting everything at year end.

Start Claiming What You Are Entitled To

The difference between a well-evidenced expense claim and a poorly documented one is not which expenses you include — it is whether you can prove them. The categories above cover everything most self-employed people can legitimately deduct. The receipts and records behind each claim are what make them defensible if HMRC asks.

If you are just getting started, our guide to how to register as a sole trader covers the first steps — including when your record-keeping obligation begins (it is from the first day of trading, not the first tax return).

Get Started with SparkReceipt's expense tracker — log expenses as they happen, capture receipts in seconds, and generate the categorised summary you need for your Self Assessment or MTD quarterly update. 7-day free trial.