Most dental associates are self-employed, file a Self Assessment return, and pay tax on profits — income minus allowable expenses. Claim everything you're entitled to and your tax bill drops meaningfully; claim things the law doesn't allow and you're exposed at an enquiry. The test, set by HMRC's rules for the self-employed, is that an expense must be incurred "wholly and exclusively" for the business. Here's how that plays out for dentistry — including two court cases every dentist should know.
Safely Deductible: The Core List
- GDC annual retention fee — your registration is a condition of practising, so it's fully deductible
- Professional indemnity — defence organisation subscriptions or insurance premiums
- Professional subscriptions — e.g. the BDA, where the body appears on HMRC's approved List 3
- Laboratory fees and materials you bear personally under your associate agreement
- Equipment — loupes, handpieces, instruments; larger purchases qualify for capital allowances, usually covered in full by the Annual Investment Allowance
- Hygienist/nurse costs where you engage and pay them yourself
- Accountancy fees, business bank charges, and business-related phone and software
- Training that updates existing skills — CPD required to maintain your registration is deductible; since HMRC's 2023 guidance update, training that broadens skills within your existing practice is also generally allowable (see BIM35660). A course that sets up an entirely new business remains capital and non-deductible
The Clothing Trap: Mallalieu v Drummond
Scrubs, surgical gowns, protective clothing — deductible, because they're protective or uniform in nature. But the smart clothes you wear in the practice are not, however much you only wear them at work. The leading case is Mallalieu v Drummond [1983], where the House of Lords refused a barrister's claim for the dark court clothing she was professionally required to wear: clothing also serves the private purpose of warmth and decency, so the expense fails the "wholly and exclusively" test. HMRC applies this directly — see BIM37910. Claim the scrubs; don't claim the suit.
The Travel Trap: Dr Samadian's Case
Travel between two practices during your working day is deductible. Travel from home to a practice where you work regularly is ordinary commuting — not deductible, even if you do genuine admin from a home office. That was decided in Samadian v HMRC [2014] UKUT 13, where a consultant who kept a home office was still refused deductions for travel between home and the private hospitals where he held regular sessions. For a dental associate the practical rule is:
| Journey | Deductible? |
|---|---|
| Home → your regular practice | No — commuting |
| Practice A → Practice B same day | Yes |
| Practice → CPD course / dental show | Yes |
| Home → one-off domiciliary visit | Usually yes — irregular workplace |
If you drive, claim either actual motor costs (business proportion) or HMRC's mileage rates — 45p per mile for the first 10,000 business miles.
Commonly Missed Claims
- Use of home as office — a reasonable proportion of household costs (or HMRC's simplified flat rate) for the hours you spend on notes, referrals and admin
- Pre-trading expenses — kit and courses bought up to seven years before you started self-employment, claimable on day one
- Pension contributions — not a trading expense but extend your basic-rate band; NHS Pension contributions for NHS work get relief through the scheme
What Not To Do
Don't claim general living costs, ordinary clothing, home-to-work travel, or the full cost of anything with substantial private use — apportion honestly. Dental associates are a group HMRC understands well; round-number expense claims with no receipts behind them are an easy enquiry target. Keep records for at least five years after the filing deadline.
Specialist Help for Dental Associates
SMD Accountancy prepares accounts and Self Assessment returns for dentists, reviews associate agreements for tax exposure, and advises on whether incorporating makes sense. Book a free 20-minute call before your next return — most new dental clients find at least one deduction they'd been missing.