Why Allowable Expenses Matter for Sole Traders

As a sole trader, you pay tax on your profits, not your total income. That means every legitimate business expense you claim reduces your taxable profit and keeps more money in your pocket. But HMRC expects you to be able to show that each cost was incurred wholly and exclusively for your business. Get it right, and you claim what you’re owed without inviting questions. Get it wrong, and you could face an unwelcome tax bill or penalty. This guide walks through the costs sole traders most commonly claim, with practical pointers on what’s allowed and what isn’t.

Travel and Transport: Watch Out for Commuting

Travel is one of the most useful categories, but also one of the easiest to get wrong. The key distinction is between ordinary commuting—which you cannot claim—and business travel, which you can. Ordinary commuting means travelling between your home and your usual place of work. If you’re a sole trader with a fixed business premises, that journey is not allowable. However, if you travel from home to a temporary workplace, or directly to a client’s site, that cost is usually fine.

Allowable travel costs typically include:

• Train, bus, taxi and air fares for business journeys
• Mileage for using your own vehicle for business—currently 45p per mile for the first 10,000 miles, then 25p
• Parking fees and congestion charges incurred while on business
• Overnight hotel and meal costs when working away from home

You cannot claim for fines, such as speeding penalties, nor for the cost of travelling to your regular workplace. Keep a simple mileage log or retain tickets and receipts so you can back up your claim.

Equipment, Technology and Office Costs

Buying tools, computers, software and furniture for your business is generally allowable. Small items—say, a keyboard or a set of hand tools—can be deducted as a normal business expense. Larger purchases, such as a laptop or machinery, are usually claimed through capital allowances. The good news is that the Annual Investment Allowance lets most sole traders deduct the full cost of qualifying equipment in the year of purchase, up to a generous limit.

If you work from home, you can claim a proportion of your household bills. Two common approaches are:

• Simplified expenses: a flat rate based on the number of hours you work from home each month
• Actual costs: working out the business percentage of your rent, mortgage interest, council tax, utilities and broadband

Phone and internet bills are also claimable, but only the business share. If your mobile contract is £40 a month and you use it 60% for work, claim £24. Keep a note of how you arrived at that percentage.

Professional Fees, Insurance and Subscriptions

Fees paid to accountants, bookkeepers and solicitors are usually allowable if they relate to running your business. That includes help with your tax return, payroll, or drawing up contracts. Legal fees for buying business premises or defending a business dispute are typically fine. You cannot deduct fines for breaking the law, nor legal costs connected with buying a personal asset.

Insurance premiums for business cover—such as professional indemnity, public liability or stock insurance—are allowable. So are subscriptions to trade bodies or professional organisations, provided the membership is relevant to your trade. If you subscribe to a magazine that helps you run your business, that can also be claimed, but a general news subscription usually cannot.

• Accountancy and bookkeeping fees
• Professional indemnity and public liability insurance
• Trade union or professional body subscriptions
• Bank charges on your business account

Clothing, Training and Client Entertaining

Clothing is a tricky one. You can claim for protective clothing, such as overalls, safety boots or a branded uniform with your logo. You cannot claim for ordinary clothes that you also wear outside work, even if you only wear them for business. The test is whether the item is truly necessary for your trade and not suitable for everyday wear.

Training costs are allowable if they update existing skills in your current trade. A plumber can claim for a course on new boiler technology. But training that qualifies you for a new trade—such as a plumber learning accountancy—is not allowable. Client entertaining, such as taking a client to lunch or buying them a gift, is generally not deductible. Staff entertaining, however, can be claimed within certain limits.

Other common costs that are usually allowable include:

• Advertising and website hosting
• Stationery and postage
• Business bank account fees
• Bad debts, but only if you previously included the income in your turnover

Keeping Records and Claiming with Confidence

HMRC doesn’t expect perfection, but it does expect evidence. Keep receipts, invoices and bank statements for at least six years after the tax year they relate to. A simple spreadsheet or a dedicated expenses app can make this painless. If you use a personal account for business purchases, highlight those transactions clearly.

When you file your self assessment tax return, claim what you’re genuinely entitled to. If you’re unsure about a particular cost, ask yourself: would I have incurred this if I didn’t run my business? If the answer is no, it’s probably allowable. If it’s a mix of personal and business, claim only the business portion and note how you calculated it.

Being organised and honest pays off. You’ll reduce your tax bill legitimately, and you’ll sleep better knowing your claim would stand up to scrutiny. If you ever feel out of your depth, a good accountant can save you far more than they cost.