For decades, dental associates had a luxury almost no other profession enjoyed: HMRC guidance that effectively treated them as self-employed by default. That ended on 6 April 2023, when HMRC withdrew the relevant paragraph of its Employment Status Manual (ESM4030). Since then, an associate's status is decided the same way as everyone else's — on the facts. At the same time, many associates ask whether they should go further and work through a limited company. Both questions deserve a careful answer.
Part 1: Are You Actually Self-Employed?
The withdrawal of ESM4030 didn't make associates employees — most remain genuinely self-employed — but it removed the safe harbour. Status now depends on the usual tests, which you can sanity-check with HMRC's CEST tool:
- Substitution — can you genuinely send a locum in your place? A real, exercisable substitution clause is the strongest single indicator of self-employment
- Control — do you decide your clinical methods, hours and patient lists, or does the practice direct you like a staff member?
- Financial risk — do you bear lab fees and bad debts, pay for your own kit and indemnity, and share in the cost of failed work?
If your written agreement says "self-employed" but in practice you work fixed hours, can't substitute, and bear no costs, the label won't save you — and reclassification means PAYE, employer's NIC and potential back-tax for the practice. Both associates and practice owners should make sure the agreement and the reality point the same way.
Part 2: The Limited Company Question
If you are self-employed, you can choose to incorporate. The trade-offs:
Where a Company Helps
- Tax deferral and flexibility — corporation tax is 19%–25% (with marginal relief between £50,000 and £250,000 of profits — see official rates); you then choose how much to extract as salary and dividends, and when. Profits you leave in the company aren't hit by higher-rate income tax until you take them. Try our sole trader vs limited company calculator and dividend tax calculator
- Income smoothing — useful if your earnings fluctuate around the £50,270 higher-rate threshold or the £100,000 personal allowance taper
- Spouse shareholding — dividends can be spread where genuinely appropriate
Where It Hurts — Especially for NHS Work
- NHS pension — this is the big one. Associates' NHS earnings are pensionable through their personal performer status; route NHS income through a limited company and you generally lose access to the NHS Pension Scheme for that income, because a company cannot hold performer status. For many associates the loss of pension accrual outweighs the tax saving entirely
- Practice resistance — some practices won't contract with an associate's company, and the off-payroll/agency rules can complicate the chain
- Costs and admin — accounts, corporation tax returns, confirmation statements, payroll; expect higher accountancy fees than a sole trader
- Double taxation on exit — money left in a company is taxed again when you finally extract it
A Rule of Thumb
| Your situation | Likely best structure |
|---|---|
| Mostly NHS associate work, value the NHS pension | Stay self-employed |
| Mostly private work, profits well above £60–70k, don't need all the income | Company worth modelling |
| Mixed NHS/private | Sometimes a hybrid — NHS personally, private via company — but only with careful advice |
| Practice owner (not associate) | Different analysis entirely — incorporation is common but goodwill and NHS contract issues dominate |
Get the Numbers Modelled, Not Guessed
The right answer depends on your private/NHS split, your spending needs, your pension intentions and your agreement's wording. SMD Accountancy models both structures with your actual figures, reviews associate agreements against the status tests, and handles incorporation end-to-end when it genuinely pays. Book a free 20-minute call — bring your last tax return and we'll tell you what the difference would have been.