Allowable Expenses for Sole Traders Under MTD

As a sole trader, every legitimate expense you claim reduces your taxable profit — and therefore your tax bill. Yet many sole traders either over-claim (risking HMRC penalties) or under-claim (paying more tax than they need to). Neither is ideal.

Making Tax Digital does not change which expenses are allowable. The same rules that applied under traditional Self Assessment still apply. What MTD changes is the rhythm: you now report expenses quarterly rather than once a year, which means staying on top of your records matters more than ever.

This guide covers the expenses sole traders can claim, with practical examples and the common mistakes that catch people out. For a broader overview of allowable expenses, see What Expenses Can I Claim Under MTD?, and for the full list of HMRC's 13 expense categories used in quarterly updates, see MTD Expense Categories Explained.

The "Wholly and Exclusively" Test

Every expense you claim must pass HMRC's core test: it must be incurred wholly and exclusively for the purposes of your business. This does not mean an item can never be used personally — it means the reason you bought it must be entirely business-related.

Where an expense has a dual purpose (part business, part personal), you can claim the business proportion. A mobile phone used 70% for business and 30% personally allows you to claim 70% of the bill. But you need to be able to justify the split if HMRC asks.

Some practical examples:

• A graphic designer buying Adobe Creative Cloud solely for client work — allowable in full
• A personal trainer buying trainers worn for both client sessions and weekend runs — business proportion only
• A freelance writer buying a novel for pleasure that happens to inspire an article — not allowable (the purchase was personal)

The test is about the purpose of the expenditure, not the outcome.

Travel and Vehicle Expenses

Sole traders who visit clients, attend meetings, or travel between job sites can claim all business travel costs. This is one of the biggest expense categories for mobile sole traders.

What you can claim:

• Train, bus, and taxi fares for business journeys
• Flights for business trips
• Fuel costs for business mileage (if using the actual cost method)
• The simplified mileage allowance — 45p per mile for the first 10,000 miles, 25p thereafter
• Parking charges at client sites or business meetings
• Congestion charges and tolls on business routes
• Hotel costs for overnight business stays
• Meal costs during overnight business trips (reasonable amounts only)

Example: A self-employed electrician drives to four different customer homes in a day. Every mile is a business mile, and the parking charges at each are claimable. The drive from home to the first job and from the last job back home is also allowable, because the electrician has no fixed workplace — each customer's home is a temporary workplace.

What you cannot claim: Your daily commute to a regular, fixed place of work. If you rent a workshop and drive there every day, that journey is commuting. If you work from home and drive to client sites, those journeys are business travel.

Working From Home

If you use part of your home as your business base, you can claim a proportion of your household running costs. HMRC offers two methods:

Simplified flat-rate allowance:

This is straightforward — no receipts or calculations needed beyond tracking your hours.

Actual cost method: Claim the business proportion of rent or mortgage interest, council tax, utilities, home insurance, and broadband. The proportion is typically calculated as rooms used for business divided by total rooms, adjusted for hours of use. This method can yield a higher claim but requires more record keeping.

You cannot use both methods simultaneously. For a detailed comparison, see Motor, Home Office and Simplified Expenses.

Professional Fees and Subscriptions

Sole traders often overlook professional costs that are fully deductible:

• Accountancy fees — including the cost of preparing your tax return
• Legal fees — for business contracts, debt recovery, or employment disputes (not personal legal matters)
• Professional body membership — RICS, CIMA, ICB, CIPD, or any body relevant to your trade
• Professional indemnity insurance — essential for consultants, advisers, and contractors
• Public liability insurance — required by many sole traders who work on client premises
• Trade journal subscriptions — print or digital, if relevant to your business
• MTD software costs — your ClearMTD subscription is an allowable business expense

Example: A self-employed management consultant pays £350 per year for Chartered Management Institute membership, £480 for professional indemnity insurance, and £600 for an accountant to handle their tax return. All three are fully deductible.

Training and Development

Training costs are allowable if they update or maintain skills you already use in your current trade. The course must be relevant to what you already do — not training for a new career.

Allowable:

• A freelance photographer attending a lighting workshop
• A self-employed plumber completing a gas safety recertification
• A sole-trader bookkeeper taking an MTD software training course
• Conference and seminar fees related to your existing trade

Not allowable:

• A web designer studying for a law degree
• A personal trainer taking a cookery course to start a catering business

The line can be blurred. If a course genuinely enhances skills within your existing trade (rather than equipping you for a different one), it is likely allowable.

What Sole Traders Can Claim That Employees Cannot

One advantage of self-employment is access to expense claims that employees simply cannot make:

• Home office costs — employees working from home have very limited relief; sole traders can claim the full business proportion
• Professional indemnity insurance — employees are covered by their employer's policy
• Business use of a personal vehicle — employees can only claim unreimbursed mileage against employment income (and only in limited circumstances); sole traders claim directly against business profits
• Marketing and advertising — employees do not market themselves; sole traders can deduct website costs, business cards, online ads, and promotional materials
• Equipment and tools — a sole-trader carpenter can claim the full cost of tools through capital allowances; an employed carpenter's employer provides them

This distinction matters if you are transitioning from employment to self-employment. Your expense landscape changes significantly, and there is real money at stake. For gig economy workers operating as sole traders, understanding these differences is particularly valuable.

Equipment and Capital Purchases

When you buy equipment, machinery, or vehicles for your business, the cost is not claimed as a day-to-day expense. Instead, you claim capital allowances, which are reported in your Final Declaration at year end.

The Annual Investment Allowance (AIA) allows you to deduct the full cost of qualifying capital purchases up to £1 million per year. For most sole traders, this means any business equipment — laptop, camera, van, tools — can be deducted in full in the year of purchase.

Capital allowances are not included in your quarterly updates. Your MTD software will handle them separately at year end.

Common Mistakes Sole Traders Make

Claiming personal expenses as business costs. The most common error. HMRC's compliance checks specifically look for personal spending mixed in with business expenses — particularly mobile phone bills, broadband, and vehicle costs where no business proportion has been calculated.

Forgetting to claim small expenses. A £3 parking charge or a £5 box of envelopes seems trivial, but these add up over a year. Under MTD's quarterly rhythm, recording expenses regularly (weekly is ideal) prevents small claims from being lost.

Confusing repairs with improvements. Replacing a broken office chair is a repair (claimable in full). Buying a standing desk to replace a functioning standard desk is an improvement (capital expenditure). The distinction affects which category and which tax year the claim falls into.

Not keeping mileage records. If you use the simplified mileage allowance, you need a log of each business journey — date, destination, purpose, and miles. Without this, HMRC can disallow your entire mileage claim.

Claiming client entertaining. Unlike limited companies, sole traders cannot claim any part of client entertainment costs. Business lunches, client gifts, and hospitality are not deductible, regardless of how clearly business-related they seem.

What You Cannot Claim

Certain expenses are never allowable for sole traders, no matter which category you try to file them under:

• Personal expenses — anything not wholly and exclusively for business
• Client entertaining — meals, drinks, gifts, or hospitality for clients or suppliers
• Fines and penalties — parking tickets, HMRC late-payment penalties, court fines
• Your own drawings — money you take from the business for personal use is not an expense
• Everyday clothing — even if bought specifically for work, unless it is a uniform or protective wear
• Capital repayments on loans — only the interest is deductible, not the capital

For the full breakdown of how HMRC categorises expenses in quarterly submissions, see MTD Expense Categories Explained.

Track Your Expenses Properly from Day One

The biggest advantage of MTD's quarterly reporting is that it forces good habits. Sole traders who record expenses as they happen — rather than scrambling through a shoebox of receipts in January — claim more legitimate deductions and pay less tax.

ClearMTD makes this straightforward. Enter your expenses into the correct HMRC categories as they occur, submit your quarterly updates in minutes, and arrive at your Final Declaration with complete, accurate figures. No spreadsheets, no guesswork.

Sign up for ClearMTD and start tracking your sole trader expenses properly.

Frequently Asked Questions

Can sole traders claim for clothing?

Only if it is a branded uniform with your business logo or protective workwear required for the job (steel-capped boots, high-vis vests, lab coats). Everyday clothing — even if you only wear it for work — is not allowable. A suit for client meetings does not qualify.

Can I claim training courses as a sole trader?

Yes, if the training updates or maintains skills you already use in your business. A web developer attending a JavaScript conference can claim the cost. A web developer taking a plumbing course cannot, because it is a new trade rather than an update to existing skills.

What is the simplified mileage allowance for sole traders?

You can claim 45p per mile for the first 10,000 business miles per year, then 25p per mile after that. This flat rate covers fuel, insurance, repairs, and depreciation — you cannot claim those separately if you use the mileage method.

Do sole traders need receipts for every expense under MTD?

MTD requires digital records of each transaction — date, amount, and category — but does not mandate storing digital copies of receipts. That said, keeping receipts is strongly recommended. If HMRC queries an expense, a receipt is your best evidence.

Can I claim expenses from before I registered for MTD?

Yes. If the expense falls within the current tax year and was incurred for business purposes, you can include it in your quarterly updates. Record it with the correct date in your MTD software.