Self-employed across one practice or five, your tax life has the same moving parts as an associate's — smaller numbers, identical traps. We handle it for a fixed monthly fee.
Most self-employed hygienists and therapists juggle several practices, each with its own pay arrangement — day rates here, fee-share there. The tax essentials are the same as for any self-employed clinician: register with HMRC, keep records that survive scrutiny, claim the right expenses, put the right amount aside. The complications are yours specifically: multi-site travel patterns, employment-status grey areas, and pay models that vary by practice.
None of this is complicated. The problem is that six deadlines belong to four different organisations and nobody sends you one list. So here is the whole of 2026/27, in order.
If 2026/27 is your first self-employed year, register with HMRC for self assessment by 5 October 2027 — the 5 October following the end of the tax year you started in. Late registration is the most common first-year mistake, and the penalty is calculated on the tax you owe, so it grows with your success.
31 July 2026 — the GDC. The annual retention fee for dental care professionals is £108 for 2026, due by 31 July along with your declaration that you hold indemnity cover. Instalments are four payments of £27, but the Direct Debit has to be set up by 31 May. Your CPD statement is a separate deadline, 28 August 2026. Miss the fee or the declaration and you come off the register — you cannot legally practise until you are restored, and restoration costs more than the fee did.
6 April 2026 — Making Tax Digital. If your gross income from self-employment and property came to more than £50,000 in 2024/25, you are already inside Making Tax Digital for Income Tax and filing quarterly updates. The threshold is turnover, not profit: a hygienist billing £54,000 across four practices and taking home £46,000 is in, because the £50,000 test ignores your expenses entirely. It falls to £30,000 from 6 April 2027 and £20,000 from 6 April 2028, which brings in almost everyone working three days a week or more. Our MTD guide for dentists sets out what a quarterly update actually contains.
31 January 2028, then 31 July 2028. Your 2026/27 return and balancing payment, then payments on account. That second one is where the damage happens, and it is worth seeing the numbers rather than the rule.
The figures below are illustrative, but the shape of them is what we see every January. Take a dental therapist working 2026/27 across three practices — a 45% fee share at one, a day rate at another, sessional work at a third.
Income tax first. The personal allowance is £12,570, so £33,276 is taxed at the 20% basic rate — £6,655.20. Class 4 National Insurance runs at 6% on profits between £12,570 and £50,270, which is 6% of that same £33,276 — £1,996.56. Class 2 is treated as paid because profits are above £7,105, so there is nothing to pay there. Total tax for the year: £8,651.76.
Now the part nobody budgets for. Because the bill is over £1,000 and none of it was collected at source, HMRC also wants payments on account of half the bill each. So on 31 January 2028 the therapist does not pay £8,651.76. They pay that plus £4,325.88 — £12,977.64 — and another £4,325.88 on 31 July 2028. In a first full year, the January bill is one and a half times the tax you thought you owed.
The fix is unglamorous: move 30% of every payment from every practice into a separate account the day it lands. On these numbers that is £15,720 across the year, which covers the whole of that first January and most of the following July. It is a blunt rule and deliberately generous. Nobody has ever regretted it.
This matters more than the tax does. HMRC's own guidance on hygienists and therapists (Employment Status Manual, ESM4031) names the factors: working across several practices rather than one, choosing your own hours, being paid sessionally or as a share of the fees, deciding the nature and extent of treatment with only minimal reference to the dentist, using your own equipment, and having no entitlement to holiday, sick or maternity pay. The mirror image — one practice, conditioned hours, a regular wage, paid leave — is employment, whatever the paperwork calls it.
HMRC is explicit that each case is decided on its own facts, and that the statutory requirement to work to a dentist's prescription is largely neutral either way. What that means in practice: a single-site hygienist on fixed sessions, using the practice's equipment, on a rota they do not control, is exposed — and so is the practice, because unpaid employer National Insurance is collected from the engager. We read the arrangement you actually have, tell you where you genuinely stand, and say so before HMRC does. The engagement guide covers the same question from the practice's side of the table.
Self-employed hygienists and therapists cannot join the NHS Pension Scheme. Scheme access for self-employed people is limited to defined practitioner groups — general dental practitioners, general medical practitioners, ophthalmic medical practitioners and non-GP providers — and dental care professionals working under a contract for services are not among them. If a practice employs you and that practice is an NHS employing authority, membership can come through the employment; the same person doing the same clinical work as a self-employed contractor gets nothing.
So the pension is entirely yours to build, and it is the largest deduction most self-employed clinicians never take. Personal contributions attract relief at your marginal rate, and they are one of very few levers that still reduce a self assessment bill after the tax year has ended. We model it alongside the tax rather than after it.
A fixed monthly fee. Your return filed months early instead of in the last week of January. Expenses reviewed against your actual year rather than a copied list. And someone to ask before you sign a new practice agreement, not after. If you also work as an associate, or you are weighing up a limited company, our associate tax guide and expenses guide cover the same ground in more depth.
Need, no — you can file your own return. Benefit, usually. The fee is allowable against tax, so a £780 accountancy fee costs a basic-rate taxpayer £576 after relief, and the value sits in three places: expenses claimed correctly rather than cautiously, knowing your January bill months before it lands, and having someone read your engagement terms before you sign them. The hygienists who gain least are single-site, on one arrangement, and confident with records. The ones who gain most work across several practices on different pay models — because that is where records fragment, mileage gets complicated, and employment status starts to matter.
The reliable list: your GDC annual retention fee (£108 for dental care professionals in 2026), indemnity cover, courses and CPD, instruments and loupes you own personally, subscriptions to professional bodies on HMRC's approved List 3, laundering of uniforms, and business mileage at 55p a mile for the first 10,000 miles and 25p a mile after that. Home admin costs, your phone and your accountancy fee are allowable too. What is not: everyday clothing, ordinary commuting to a practice you attend regularly, and anything with meaningful private use unless you apportion it honestly. The claim should reflect your actual year — a copied list is what makes an enquiry expensive.
One system, not four. Every engagement logged with the practice name, the dates worked, gross fees and any deductions the practice makes at source; receipts captured at the moment you spend rather than hunted for in January; mileage recorded per journey with the practice you drove to. Set up once — we do this at onboarding — it takes a few minutes a week. It also makes Making Tax Digital a non-event rather than a crisis, because a quarterly update becomes a button press rather than a reconstruction. The practices will not do this for you, and their remittance formats will not agree with each other.
HMRC's Employment Status Manual (ESM4031) looks at the pattern, not the contract. Self-employment looks like several practices, your own hours, sessional or percentage pay, your own equipment, real freedom over the treatment you provide, and no holiday, sick or maternity pay. Employment looks like one practice, conditioned hours, a regular wage and paid leave. Most arrangements sit somewhere between, and HMRC says each is decided on its own facts. The statutory requirement to work under a dentist's prescription is largely neutral and settles nothing either way. If you work at one site, on the practice's rota, with the practice's equipment, the risk is real — and it falls on both of you.
No. Access for self-employed people is restricted to defined practitioner groups — general dental practitioners, general medical practitioners, ophthalmic medical practitioners and non-GP providers — and self-employed dental care professionals are not among them. If a practice employs you and that practice is an NHS employing authority, membership can come through the employment; the same person doing identical clinical work as a self-employed contractor gets nothing. It is one of the genuine trade-offs of self-employment and it is worth pricing properly. A personal pension attracts relief at your marginal rate, so a higher-rate contributor turns £600 net into £1,000 in the fund.
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