25 Allowable Expenses Sole Traders Often Miss

Last month, in a single afternoon reviewing one client's records, we found £2,300 of genuinely allowable expenses he'd never claimed, spread across eleven different things he'd simply never thought to mention. Not one of them was unusual or obscure. Every single item was something HMRC has always allowed. He'd just never been told, clearly, that they counted.

That's really the story behind this whole article. Most sole traders across Kent aren't underclaiming because they're careless. They're underclaiming because nobody ever handed them a proper, specific list. Our previous article explained the core rules behind what you can and can't claim. This one is different: it's a genuinely practical, numbered list of the twenty-five expenses we see missed most often, working with sole traders and contractors across Folkestone, Dover, Canterbury, Ashford, and Deal. Some of these will feel obvious once you read them. Others, we promise, will genuinely surprise you.

1. Bank and Card Processing Fees

Monthly account charges, transaction fees on a business account, and the percentage taken by a card payment provider each time a customer taps their card are all allowable. A hairdresser client of ours in Hythe hadn't realised her card machine's transaction fees, a small percentage on every single payment throughout the year, added up to a genuinely meaningful sum once totalled properly.

2. Interest on Business Loans, Credit Cards, and Overdrafts

The interest element of a business loan or overdraft is allowable, even though the capital repayment itself isn't. If you've used a business credit card and carried a balance, the interest charged is a genuine, claimable cost, though obviously one worth minimising where possible.

3. A Share of Your Mobile Phone Bill

Even on a personal contract, a reasonable proportion of your mobile phone costs relating to genuine business use is allowable. A contractor client of ours near Ashford had never claimed this at all, assuming that because the contract was in his personal name, it simply didn't count. It absolutely does, provided the business proportion is honestly calculated.

4. A Share of Your Home Broadband and Internet

If you work from home even partially, a fair proportion of your broadband costs is allowable, calculated on the same basis as your other use-of-home expenses.

5. Accounting and Business Software Subscriptions

Xero, QuickBooks, invoicing tools, project management software, and similar subscriptions used for the business are straightforwardly allowable. It's a surprisingly common oversight, particularly for sole traders who set these subscriptions up years ago and have simply stopped thinking of them as a business cost worth mentioning.

6. Trade and Professional Body Memberships

Membership fees for a recognised trade or professional body relevant to your work are allowable, provided the body appears on HMRC's approved list, which covers the great majority of genuine industry associations.

7. Trade Publications, Journals, and Industry Books

Subscriptions to trade magazines, industry journals, or books directly relevant to your profession are a genuinely allowable cost, though general reading unrelated to your trade isn't.

8. Website Hosting, Domain Renewal, and Design Costs

Your website's hosting fees, domain name renewal, and any design or development costs are allowable business expenses. A landscape gardener client of ours near Ashford had paid for a website redesign the previous year and hadn't mentioned it to his accountant at the time, assuming, incorrectly, that it was somehow separate from his "normal" running costs.

9. Bad Debts You'll Genuinely Never Recover

If a client owes you money you've already declared as income but genuinely have no realistic prospect of ever collecting, that amount can be written off as a bad debt, reducing your taxable profit accordingly. This isn't a decision to make lightly or too quickly, but it's a genuine relief worth knowing about if you've been chasing an unpaid invoice for a long time with no success.

10. Pre-Trading Expenses From Before You Registered

Genuine business costs incurred in the seven years before you officially started trading, provided they'd have been allowable had the business already begun, can typically be claimed as if incurred on your very first day of trading. A café owner near Whitstable had purchased equipment and undertaken renovation work months before she actually opened her doors; almost all of it was genuinely claimable, something she hadn't realised was even possible until we explained it during her first year with us.

11. Dartford Crossing Tolls and Other Business Travel Charges

This one's specific to our part of the world, and it catches out a genuine number of Kent-based businesses. If you're travelling for business and cross the Dartford Crossing, the Dart Charge toll is an allowable expense, alongside congestion charges, parking fees, and similar costs incurred on genuine business journeys. A delivery driver client of ours regularly crossing into Essex for supplier collections had never once claimed his Dart Charge costs, despite them building up meaningfully over a year of regular trips.

12. Protective Clothing and Safety Equipment

Safety boots, hi-vis clothing, hard hats, and other genuine protective equipment specific to your trade are allowable, distinct from everyday clothing, which generally isn't.

13. Replacement Tools and Equipment Repairs

Repairing or replacing a broken tool, rather than buying new equipment outright, is typically treated as a straightforward expense rather than a capital purchase, and it's an area often confused with the capital allowances process, leading some sole traders to under-claim smaller, routine repair and replacement costs.

14. A Share of Home and Buildings Insurance

If you work from home, a proportion of your home insurance, reflecting the genuine business use of the property, is allowable alongside your other use-of-home costs.

15. Storage Costs for Stock, Tools, or Materials

If you rent a separate storage unit or garage to hold stock, tools, or materials for the business, that rental cost is a straightforward allowable expense, and one we find gets overlooked simply because it feels like a "personal" arrangement rather than a formal business cost.

16. Postage, Courier, and Delivery Charges

Stamps, courier fees, and delivery charges for sending goods, documents, or samples related to the business are all allowable, however small they might seem individually.

17. Small Branded Promotional Gifts to Clients

Modest branded promotional items, a pen, a mug, a diary with your business name on it, given to clients or prospective clients, are allowable up to certain limits, distinct from client entertainment, which isn't allowable at all. The distinction lies in the item being a genuine, low-value marketing gift rather than hospitality.

18. Local Advertising, Sponsorship, and Directory Listings

Beyond the obvious cost of a website, sponsoring a local Kent sports team, taking out a listing in a trade directory, or placing an advert in a local publication are all genuine, allowable marketing costs. A builder's merchant near Ashford sponsors a junior football team's kit each season, a small, entirely legitimate business expense that also does genuine good in the local community.

19. DBS Checks, Licences, and Required Certifications

If your trade requires a DBS check, a specific licence, or a professional certification to legally operate, the cost of obtaining or renewing it is allowable. This is particularly relevant for tradespeople, childcare providers, and anyone working in a regulated profession across Kent.

20. Business Bank Account Fees and Standing Charges

Beyond transaction fees already mentioned, any standing monthly charge for maintaining a dedicated business bank account is itself allowable, a small but entirely legitimate cost many sole traders simply forget to mention because it's paid automatically each month.

21. Your Previous Year's Accountancy Fees

It sounds almost too obvious to mention, but it catches people out regularly: the fee you pay your accountant is itself a deductible business expense. A plumber client of ours near Folkestone hadn't realised this at all, assuming, reasonably enough, that a cost paid to help calculate his tax couldn't itself reduce his tax bill. It genuinely can.

22. Training That Updates Existing Skills

Courses, certifications, or CPD training that maintain or update skills you already use in your current trade are allowable, distinct from training that creates an entirely new qualification for a different profession, which generally isn't.

23. Use of Home, Calculated Properly Rather Than Guessed

We've covered this in more depth elsewhere, but it deserves a mention here specifically because it's so commonly under-claimed. Many sole traders default to a rough, conservative estimate of their use-of-home costs rather than properly calculating either the simplified flat rate or their genuine actual proportion, often leaving a meaningful amount unclaimed simply through caution rather than any genuine uncertainty about eligibility.

24. Trivial Gifts to Any Staff You Employ

If you employ staff, small gifts, a bottle of wine at Christmas, a modest voucher for a birthday, can be provided free of tax and National Insurance under HMRC's trivial benefits rules, provided the gift costs £50 or less per person and isn't a reward tied to performance or a contractual entitlement. A retail client of ours near Maidstone, with a handful of staff, hadn't realised this existing goodwill gesture could be structured properly to be genuinely tax-efficient rather than simply a cost absorbed without any relief at all.

25. Business Rates or a Proportion, for Separately Assessed Premises

If you rent separate business premises, or part of your home has been separately assessed for business rates rather than falling under your normal council tax, those rates are a straightforward allowable cost, distinct from the use-of-home calculations that apply to a more informal home working arrangement.

Why These Specific Items Get Missed So Often

Looking back across this list, a pattern becomes fairly clear. Almost every item here is something that either feels too small to mention, feels somehow "personal" rather than business-related, or is simply paid automatically each month without ever prompting a second thought. None of them are obscure loopholes. They're ordinary, ongoing costs of running a business that HMRC has always recognised as genuinely deductible.

The businesses that claim these properly, consistently, aren't doing anything clever or aggressive. They're simply keeping better records and having a genuinely thorough conversation with their accountant, rather than assuming their accountant will somehow intuit every cost without being told.

A Simple Habit That Fixes Most of This

We'd suggest one genuinely practical habit above all others: whenever you're unsure whether something counts, mention it anyway. Send a quick message, note it in your bookkeeping software, or simply bring it up at your next review. It costs you nothing to ask, and it's far easier for us to tell you something isn't allowable than to reconstruct a missed claim months or years later.

A builder client of ours near Sittingbourne now keeps a simple running note on his phone throughout the year, jotting down anything he's even slightly unsure about, a new subscription, a piece of protective kit, a toll charge from a long trip out of the county. We go through it together at his quarterly review. It takes ten minutes, and it consistently surfaces two or three items he'd otherwise have simply forgotten about entirely.

What to Do If You Think You've Missed Something in Previous Years

If reading through this list has made you suspect you've been under-claiming for a while, it's genuinely worth having that conversation properly rather than letting it go. As covered in our previous article, missed expenses can often be claimed retrospectively, typically within four years of the end of the relevant tax year, through an amendment or formal claim to HMRC.

We regularly review new clients' historical records specifically for this reason, and it's rarely a wasted exercise. If you suspect you might be one of the many sole traders across Kent quietly overpaying tax simply because nobody ever handed you a proper list like this one, it's worth finding out for certain.

Getting a Proper Review

As a two-partner practice based in Folkestone, we make it a genuine priority to go through a new client's expenses thoroughly, not just take whatever figure they hand us at face value. If you're a sole trader across Folkestone, Dover, Canterbury, Ashford, or Deal, and you'd like us to take a proper look at whether you're claiming everything you're entitled to, get in touch with us at Cannon Accountants. We'll review your situation honestly and tell you plainly what, if anything, you've been missing.

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Frequently Asked Questions

How far back can I actually claim missed expenses?

Typically up to four years from the end of the relevant tax year, through a formal claim or amendment to HMRC, though the exact process depends on how the original return was filed. It's worth discussing your specific situation directly rather than assuming a fixed rule applies universally.

Do I need a separate business bank account to claim these expenses properly?

It's not a legal requirement for sole traders, though it makes claiming and evidencing expenses considerably easier, since business and personal transactions aren't mixed together on the same statement. Many of the items on this list are far simpler to identify and claim with a dedicated account in place.

What if an expense feels too small to be worth mentioning to my accountant?

Mention it anyway. Individually small costs, a card processing fee here, a toll charge there, genuinely add up meaningfully across a full year, and it costs you nothing to raise something that turns out not to be relevant.

Is there a risk of over-claiming if I start being more thorough about this?

Provided every expense you claim genuinely relates to your business and is properly recorded, thoroughness itself isn't a risk. The concern only arises when personal costs are claimed without a genuine business justification, which is precisely why a proper conversation with your accountant about anything you're unsure of is worth having.

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.