Sole Trader Allowable Expenses UK: What You Can Claim

What Does "Allowable Expense" Mean for UK Sole Traders?

An allowable expense is any cost you can deduct from your self-employment income before calculating the profit on which you pay tax. The more allowable expenses you legitimately claim, the lower your taxable profit and the less Income Tax and National Insurance you owe.

HMRC's core rule is that an expense must be wholly and exclusively for the purposes of the trade. This means:

• If an expense is 100% for business use, you claim 100% of it
• If an expense has a dual purpose — partly personal, partly business — you can claim only the business proportion
• If an expense is primarily personal with an incidental business benefit, HMRC will disallow it entirely

You claim allowable expenses on your Self Assessment tax return each year, reducing your taxable profit on the SA103 self-employment pages. HMRC does not ask for receipts when you file, but you must keep records for at least five years after the filing deadline in case HMRC opens an enquiry.

Office and Home Working Costs

If you rent a dedicated office or studio, the rent and associated utility bills are 100% allowable. If you work from home — even part of the time — you can claim a portion of your home costs using one of two methods.

Simplified flat rate (most common): HMRC publishes fixed monthly rates based on hours worked from home each month:

• 25–50 hours per month: £10/month
• 51–100 hours per month: £18/month
• 101 or more hours per month: £26/month

Actual cost method: Calculate the business proportion of your actual home costs — mortgage interest or rent, council tax, heating, electricity, and broadband. Divide by the number of rooms in your home and by the proportion of time the room is used for work. This method takes more record-keeping but usually produces a larger claim for those who work from home full time.

Other office costs that are fully allowable include stationery, printer ink and paper, postage, and computer software used solely for business. Equipment such as a laptop or desk is also allowable, typically through the Annual Investment Allowance rather than as a direct expense in the year of purchase.

Travel and Vehicle Expenses

Business travel is allowable — but commuting from your home to a regular, fixed place of work is not. HMRC treats your home as your place of residence, not a base for travel claims. If your home is also your place of business (e.g. you work from home and visit clients), all journeys to client sites are business travel.

For vehicles, you choose one of two methods and must apply it consistently for that vehicle:

• Simplified mileage rate: 45p per mile for the first 10,000 business miles in the tax year, then 25p per mile after that. This covers all vehicle running costs — you cannot also claim fuel, insurance, or servicing separately.
• Actual cost method: Claim the business proportion of all actual costs — fuel, insurance, road tax, MOT, servicing, repairs, and capital allowances on the purchase price. Requires a mileage log to prove the business percentage.

Train, bus, taxi, and air fares for business trips are allowable in full. Overnight accommodation and subsistence on multi-day business trips are also allowable — HMRC publishes benchmark rates for daily subsistence (currently £5 for 5–10 hours, £10 for 10+ hours away, with a meal rate of up to £25 for overnight stays).

Stock, Materials, and Equipment

The cost of goods you buy to resell, or materials and components used directly in the work you deliver to clients, is always allowable. This includes:

• Raw materials and components
• Packaging and delivery costs for goods sold
• Subcontracted work done by others on your behalf
• Tools and equipment used in your trade

Capital expenditure — equipment, machinery, vehicles, or computers that you will use for more than one year — is handled through the Annual Investment Allowance (AIA). The AIA lets you deduct the full cost of capital purchases up to £1 million in the year of purchase, rather than spreading the deduction over several years. For most sole traders, this means equipment costs can be fully written off in the year they are bought.

Staff, Subcontractors, and Professional Fees

If you employ staff, all of the following are allowable:

• Gross wages and salaries
• Employer National Insurance contributions
• Employer pension contributions
• Recruitment agency fees
• Staff training directly related to the business

Payments to subcontractors who work on your behalf are also fully allowable. Professional fees — accountant fees, bookkeeping fees, legal fees for commercial matters — are allowable in full. Outsourcing your bookkeeping to an Indian CA firm qualifies as an allowable professional fee, which means HMRC effectively subsidises the cost through your reduced tax bill.

Business bank charges, overdraft fees, and interest on loans taken out for business purposes are also allowable. Personal credit card interest and personal loan interest are not.

Marketing, Advertising, and Subscriptions

All reasonable costs of promoting your business are allowable, including:

• Website design, hosting, and domain registration
• Google Ads, Meta Ads, and other paid advertising
• Printed marketing materials — flyers, business cards
• Professional photography for business use
• Trade magazine and industry publication subscriptions relevant to your work
• Professional body membership fees where membership is required or expected in your trade

Client entertainment — taking clients out for meals or drinks — is not allowable and has been explicitly excluded by HMRC for many years. There is no partial claim for entertaining; the full cost is disallowed.

Allowable vs Not Allowable — Quick Reference

The £1,000 Trading Allowance

If your total self-employment income in a tax year is under £1,000, you do not need to pay tax on it or register for Self Assessment. This is the trading allowance, and it applies to income from self-employment, casual work, and online selling.

If your self-employment income is above £1,000, you have a choice on how to calculate your taxable profit:

• Claim the £1,000 trading allowance — subtract £1,000 from your gross income instead of listing actual expenses
• Claim your actual allowable expenses — list every qualifying expense and deduct the total

Choose whichever method produces the larger deduction and therefore the lower profit. You cannot use both methods in the same tax year. For most sole traders with regular business costs, actual expenses will significantly exceed £1,000 and should be claimed instead.

How to Claim Allowable Expenses on Your Self Assessment

Allowable expenses are claimed on the self-employment supplementary pages (SA103) of your Self Assessment tax return. You enter your gross income and then total expenses by category. HMRC's online return system has drop-down categories for each expense type — office costs, travel, wages, and so on.

The process for the tax year is:

1. Throughout the year, record every business expense with the date, amount, and business purpose
2. Keep receipts, invoices, or bank statements as supporting evidence
3. At year end (5 April), total up expenses by category
4. Enter totals in the relevant boxes on your SA103 return
5. File your return online by 31 January (or 31 October for paper returns)

Good bookkeeping throughout the year makes this far less stressful. Sharma Jyoti and Co provides sole trader bookkeeping for UK clients — we categorise your expenses month by month so that your Self Assessment return at year end is simply a review, not a scramble. Our rates start at £8–£15 per hour, well below the cost of a UK bookkeeper or accountant.

Frequently Asked Questions