Chapter 5: What Sole Traders Can Really Claim
Key point: The UK tax system does not require a business to be taxed without regard to the cost of earning its income. Where expenditure satisfies the wholly and exclusively test, many everyday costs that small traders ignore may properly be claimed as deductions.
When advising sole traders, one recurring concern appears with notable consistency: "Can this really be claimed? It seems too personal. I am concerned that HMRC may challenge it."
As a result of that anxiety, many small-business owners move to the opposite extreme and claim almost nothing at all. In practice, they may end up paying tax on gross income, or on something uncomfortably close to it.
The essential shift in perspective is this: HMRC does not ask whether a payment merely appears business-like. The question is whether the expenditure was incurred for business purposes and, where there is mixed use, whether a reasonable apportionment can be made.
What follows is a practical overview of the deductions sole traders most often overlook.
Section 1: Home Working and the Use of the Home for Business
If clients are met at home, parcels are packed at home, design work is undertaken there, or the books are maintained there, then part of the home's function is plainly commercial. In those circumstances, it is entirely proper to consider whether a proportion of occupancy and utility costs may be attributed to the business.
Many sole traders assume that because the home is not a formal office, nothing meaningful can be claimed. That assumption is often incorrect. If genuine business activity takes place there, some form of deduction is frequently available.
HMRC gives you two broad approaches.
Method One: Flat-Rate Deduction
If you work from home over a threshold number of hours each month, HMRC allows a simple flat-rate deduction. It is easy but often very small.
Method Two: Apportionment by Reference to Use
This is often the more substantial route in practice. Household bills may be apportioned by room count, time used, or another method that is reasonable on the facts.
Typical claimable costs include:
- rent or mortgage interest
- electricity, gas, and water
- Council Tax
- home insurance
Example: If your home has five main rooms and one small bedroom is used partly as an office, that is 1/5 of the home. If it is used for business about 50% of the time, then roughly 10% of relevant household costs may become legitimate business expenses.
One important warning: never claim that a room in your owned home is used 100% for business and never personally. That can create Capital Gains Tax problems when you later sell the property, because part of the home may no longer qualify fully for private residence treatment.
Section 2: Frequently Overlooked Deductions, Communications and Travel
Phone and Broadband
These are core tools for most sole traders, yet many people avoid claiming them because the household uses them as well. In practice, a separate device is not necessarily required; what is required is a reasonable business-use percentage. If around 80% of your mobile use is for customer contact, then claiming 80% of the mobile plan may be entirely reasonable. If home broadband is half business use, then 50% may be reasonable.
Travel Expenses
This is an area in which errors are common.
You generally cannot claim the cost of commuting from home to a permanent workplace. But you usually can claim travel to temporary workplaces and client sites.
If you are a plumber visiting different customers each day, or a designer travelling to different meeting locations, those journeys can be business travel.
For cars, the most straightforward and defensible approach is often HMRC's mileage allowance, rather than attempting to apportion each petrol receipt individually. Business mileage is recorded and the approved rate applied.
Section 3: Clothing, Food, and the Border Between Personal and Business
Clothing
A £500 suit bought for an important meeting is usually not deductible. HMRC treats ordinary smart clothing as having dual purpose: professionalism and personal warmth or decency.
Usually the only safe claims here are:
- uniforms with a clear company logo
- protective clothing or specialist safety equipment
Meals and Entertainment
Client entertaining is generally not deductible for Income Tax. If you take a client to dinner, that is usually on you.
But travel subsistence can be deductible. If you travel away from your normal base for business, especially overnight, your food and drink in that context can often be claimed.
Section 4: Capital Items, Computers, Tools, and Equipment
If you buy a £2,000 computer for editing or £3,000 of professional tools, this is usually capital expenditure. In theory capital items are handled differently from day-to-day costs.
But the UK gives many small businesses a powerful relief called Annual Investment Allowance (AIA). That often means the entire cost of qualifying equipment can be deducted in the year of purchase rather than slowly over time.
This is why many well-advised business owners who have had a high-profit year bring forward equipment purchases that they genuinely require before the tax year ends. In doing so, they retain more value within the business rather than surrendering a larger amount to HMRC.
Tax deductions are not loopholes. They are the legal recognition of the cost of earning income. Where records are kept properly and the rules are applied carefully, the sums preserved can be substantial.