What Expenses Can a Sole Trader Claim?

Here's something that genuinely surprises almost every new client we take on: you can go back and claim missed expenses for up to four years after the fact. We recently reviewed the historical records of a plumber client near Hythe and recovered several hundred pounds simply by properly claiming costs he'd been entitled to all along, materials, a portion of his van running costs, professional membership fees, none of which he'd ever thought to mention to his previous accountant. That's not a one-off story. It's one of the most common conversations we have.

The honest truth is that most sole traders across Kent are leaving money on the table, not through any fault of their own, but simply because nobody ever gave them a clear, specific answer to the question "what can I actually claim?" So here it is, properly, category by category, with the genuine rules explained plainly and real examples from our own practice across Folkestone, Dover, Canterbury, Ashford, and Deal.

The Core Rule Behind Everything

Before the categories themselves, it's worth understanding the single principle that governs all of this. HMRC allows you to deduct expenses that are incurred "wholly and exclusively" for the purpose of your business. That phrase does a lot of work, and it's worth sitting with for a moment.

"Wholly and exclusively" means the expense genuinely needs to relate to your business, not simply be useful to you generally. A laptop bought purely for client invoicing and business admin is straightforward. A laptop used half for business and half for your teenager's gaming is more complicated, though not necessarily disqualified; HMRC allows a reasonable, justifiable split for genuinely mixed-use items, provided you can demonstrate the business proportion honestly.

Understanding this principle helps with almost every grey area you'll encounter, so keep it in mind as we go through the specifics.

Premises and Working From Home

If you work from home, even partially, you're entitled to claim a proportion of your household running costs: heating, electricity, and a share of your council tax and mortgage interest or rent, calculated fairly based on how much of your home is used for business and how often.

There are two ways to calculate this. HMRC's simplified flat rate scheme lets you claim a fixed monthly amount based purely on hours worked from home, £10 a month for 25 to 50 hours, £18 a month for 51 to 100 hours, and £26 a month for 101 hours or more, without needing to calculate actual costs at all. Alternatively, you can calculate your actual costs properly, working out the proportion of your home genuinely used for business, which often produces a larger, more accurate claim, particularly if you have a dedicated room used consistently for work.

A graphic designer client of ours near Canterbury, working from a spare bedroom converted into a proper office, found that calculating her actual costs rather than using the flat rate nearly doubled her claim. It took slightly more record-keeping, but the difference was genuinely worth the extra effort.

If you rent separate business premises entirely, rent, business rates, utilities, and buildings insurance for that space are all straightforwardly allowable.

Travel and Vehicle Costs

This is one of the areas we see the most confusion around, so it's worth being specific. Ordinary commuting, travelling from home to a single, regular place of work, generally isn't allowable, mirroring the rules that apply to employees. But travel between different work sites, to meet clients, or to collect materials and supplies, is a genuine business cost.

For vehicle costs specifically, you again have a choice between two methods. Simplified expenses let you claim a flat mileage rate, currently 55p per mile for the first 10,000 business miles in a tax year, dropping to 25p per mile after that, covering fuel, insurance, and wear and tear in a single, simple figure. Alternatively, you can claim actual costs, fuel, insurance, servicing, and a proportion of the vehicle's value through capital allowances, apportioned based on business versus personal use, which suits some businesses better, particularly those with higher-value or more expensive-to-run vehicles.

A landscape gardener client of ours near Ashford, covering considerable mileage between sites across East Kent, found the flat mileage rate produced a genuinely better result than tracking actual costs, largely because his vehicle itself was relatively modest in value. A contractor with a newer, more expensive van might find the actual cost method more favourable instead. It's worth running the comparison properly rather than assuming one method is always better.

Materials, Stock, and Subcontractors

For any business that buys materials, stock, or supplies to sell on or use directly in delivering a service, these costs are straightforwardly allowable, provided they're genuinely used for the business. This includes raw materials for a tradesperson, stock for a retailer, or ingredients for a café. Payments to subcontractors, provided they're genuinely engaged for business purposes and properly recorded, are equally allowable, though if you're in the construction industry specifically, the Construction Industry Scheme brings additional reporting requirements worth discussing directly with us.

Professional and Financial Costs

Accountancy fees, unsurprisingly, are themselves an allowable business expense, along with other professional fees genuinely related to running the business, legal advice on a contract dispute, for instance. Business insurance, public liability cover, professional indemnity insurance, and similar policies are allowable in full. Bank charges and interest on business loans or overdrafts are also allowable, though the capital repayment portion of a loan itself is not, only the interest element.

Professional subscriptions and trade body memberships are allowable too, provided the body appears on HMRC's approved list, which covers the vast majority of genuine industry and professional associations relevant to Kent's trades and professional sole traders.

Marketing and Business Development

Website costs, business cards, local advertising, a listing in a trade directory, and sponsorship of a local event undertaken for genuine promotional purposes are all allowable. A café owner we work with near Whitstable sponsors a small local sports team's shirts each year, a modest, entirely legitimate marketing expense that also happens to be good for her standing in the local community.

Training: A Genuine Grey Area Worth Understanding Properly

This is one of the areas where the rules genuinely surprise people, so it deserves proper explanation rather than a simple yes or no. Training that maintains or updates skills you already use in your existing business is allowable, a plumber attending a course on new boiler technology, for example. Training that gives you an entirely new skill or qualification, allowing you to move into a different trade or profession altogether, generally isn't allowable, because HMRC views this as improving your personal capital rather than maintaining your existing business.

A driving instructor client of ours wanted to claim the cost of an advanced driving qualification that would let him teach a new, higher category of student. Because this genuinely extended his existing area of expertise rather than creating an entirely new one, it qualified. Compare that to a hypothetical situation where the same instructor decided to retrain entirely as an electrician; that cost wouldn't be allowable against his driving instruction business, because it isn't maintaining or updating skills he already uses, it's creating a completely new set of skills for a different trade.

Equipment and Capital Allowances

Larger purchases, tools, machinery, computer equipment, and vehicles, are typically treated differently from day-to-day running costs, through a system called capital allowances rather than a straightforward expense deduction. The Annual Investment Allowance lets most sole traders claim the full cost of qualifying equipment against their profit in the year of purchase, up to a generous annual limit that covers the overwhelming majority of small business purchases entirely.

A builder's merchant client of ours near Ashford had purchased two vans and a forklift over a couple of years without ever properly claiming allowances on them, simply because nobody had explained the process clearly. Once corrected, it recovered him several thousand pounds in relief he was fully entitled to the whole time. If you've bought anything substantial for your business recently, genuinely mention it to us directly, rather than assuming it's been picked up automatically.

Clothing: One of the Most Misunderstood Categories

Everyday clothing, even if you only wear it for work, generally isn't allowable, because HMRC considers it something you'd need regardless of your job. This catches people out constantly, and understandably so; it feels unfair that a suit worn exclusively for client meetings isn't claimable, but that's genuinely the rule.

Genuine uniforms, branded workwear with a company logo, and protective clothing, safety boots, hi-vis vests, hard hats, are properly allowable, because they're specific to the business and not something you'd reasonably wear otherwise. A builder client of ours near Sittingbourne claims his safety boots and branded hi-vis clothing without issue, but correctly doesn't attempt to claim the smart-casual clothes he sometimes wears to a client meeting, because that clothing has genuine everyday use beyond the business.

What You Cannot Claim, Clearly Stated

It's worth being direct about the other side of this too. Client entertainment, meals, drinks, or events specifically to entertain clients rather than genuinely necessary business travel subsistence, is not allowable, a rule that catches out a surprising number of business owners who assume a client dinner is a straightforward write-off. Fines and penalties, whether parking tickets picked up on a work trip or any other regulatory penalty, are never allowable. Everyday clothing without a genuine uniform or protective element isn't allowable, as covered above. And the capital repayment portion of any loan, as distinct from the interest, isn't allowable either.

Simplified Expenses: A Genuinely Useful Option for Smaller, Simpler Businesses

We've mentioned flat rates for mileage and home working above, but it's worth summarising simplified expenses as a whole system. If your business is relatively straightforward, simplified expenses let you use HMRC's set flat rates rather than calculating and justifying actual costs for mileage, working from home, and living on business premises (relevant to a smaller number of businesses, such as a guesthouse owner living above their premises).

This approach suits businesses with lower actual costs or those who'd rather avoid the extra record-keeping actual costs require. It doesn't suit everyone; a business with genuinely higher costs than the flat rate reflects will usually do better calculating actual figures properly. It's worth reviewing which approach suits your specific circumstances rather than defaulting to one without comparison.

Claiming Missed Expenses From Previous Years

As we opened with, you're not limited to only claiming expenses in the current tax year. If you realise you've missed genuine, allowable expenses in a previous return, you can typically amend that return within twelve months of the original filing deadline, and in some circumstances go back further through a formal claim to HMRC, generally within four years of the end of the relevant tax year.

We reviewed the historical records of a hairdresser client near Hythe shortly after taking her on, and found she'd been under-claiming her use-of-home costs for two full years, simply because nobody had ever properly calculated her actual proportion rather than defaulting to a rough guess. Amending those returns recovered a genuinely worthwhile sum. If you've never had your previous returns properly reviewed for missed expenses, it's worth asking directly whether that's something worth doing.

A Few Genuinely Common Mistakes We See

A few patterns come up often enough to flag specifically. Business owners frequently forget to claim a proportion of their mobile phone costs, even when a meaningful share of calls and data usage is genuinely business-related. Professional subscriptions and trade memberships are commonly overlooked entirely, simply because people don't think to mention them. And use-of-home costs are very often estimated roughly rather than calculated properly, usually resulting in a lower claim than the business owner is genuinely entitled to.

Getting This Right, Properly

The honest, simple advice underlying all of this is: keep clear, complete records of everything you spend on the business throughout the year, and have a proper, thorough conversation with your accountant about your specific circumstances, rather than assuming you already know the full list of what's allowable. Grey areas like training and mixed-use costs genuinely benefit from a direct conversation about your particular situation, rather than a generic checklist applied blindly.

As a two-partner practice based in Folkestone, we make it a priority to review every new client's expense claims properly, both going forward and, where it's worth it, retrospectively, to check nothing genuinely allowable has been missed. If you're a sole trader across Folkestone, Dover, Canterbury, Ashford, or Deal, and you're not entirely confident you're claiming everything you're properly entitled to, get in touch with us at Cannon Accountants. We'll review your situation honestly and tell you plainly what you might be missing.

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Frequently Asked Questions

Can I claim for meals I buy while working away from my normal base?

Genuine subsistence costs while travelling for business, away from your normal place of work, are generally allowable. Regular meals during a typical working day at your usual base are not, and client entertainment specifically is never allowable, regardless of the circumstances.

What if I use something for both personal and business purposes?

A reasonable, honest split is allowable for genuinely mixed-use items, a mobile phone, home internet, or a vehicle, for example. The key is being able to justify the proportion you're claiming, based on genuine business use, rather than an arbitrary or overly generous estimate.

Do I need a receipt for every single expense I claim?

Ideally, yes, though for very small amounts where a receipt genuinely wasn't provided or has been lost, a bank statement showing the transaction can sometimes support a claim. It's always safer to keep proper receipts wherever possible, since they provide the clearest evidence if HMRC ever queries a claim.

Can I claim expenses from before I officially registered as self-employed?

Yes, genuine pre-trading expenses incurred in the seven years before you started trading, provided they'd have been allowable had the business already started, can typically be claimed as if incurred on your first day of trading. This often surprises new business owners who assume only costs after registration count.

Disclaimer:

The content of this blog is for general informational purposes only and should not be considered professional tax advice. The information is correct at the time of publishing but may change following future UK budget announcements or updates to HMRC guidance. Individual circumstances vary, and tax obligations can differ based on your personal situation. We strongly recommend consulting with us or a qualified tax professional to receive advice tailored to your specific needs.