Key takeaways
- Locum pharmacists are paid in three ways — PAYE through an agency or pharmacy, self-employment, or a limited company — and many combine more than one at once.
- Employment status depends on the facts of each engagement, not preference: HMRC has long argued that many community pharmacy locum arrangements look like employment.
- Self-employed locums must register with HMRC, file a Self Assessment return, pay Class 4 National Insurance and budget for payments on account.
- A limited company only delivers tax savings where engagements are genuinely outside IR35 — each engagement is assessed on its own facts.
- Pharmacists' healthcare services are generally VAT-exempt, and community pharmacy locums generally cannot pension their locum earnings in the NHS Pension Scheme.
Locum pharmacists in the UK are paid in three main ways: through an agency or pharmacy payroll (PAYE), as a self-employed sole trader, or through their own limited company. Each is taxed differently — and, unlike most freelance work, the choice is not simply yours to make. Employment status for locum pharmacists is genuinely contentious, and HMRC has long argued that many community pharmacy locum arrangements look more like employment than self-employment.
This guide covers how each model works, how employment status is actually decided, what to budget for if you are self-employed, when a limited company stacks up, and the expenses, VAT and pension rules specific to pharmacy locums. Figures are for the 2025/26 tax year unless labelled otherwise; Scottish Income Tax rates and bands differ.
How locum pharmacists get paid: the three models
Most locums use one of three arrangements — and plenty combine them, for example PAYE for hospital bank shifts alongside self-employed community pharmacy bookings. Tax is worked out separately for each income stream, so it is perfectly normal to have PAYE income and self-employed profits on the same Self Assessment return.
- PAYE — the agency or pharmacy puts you on its payroll, deducts Income Tax and employee's National Insurance before paying you, and you may get holiday pay and pension auto-enrolment. The simplest option, but usually the lowest headline rate.
- Self-employed — you invoice for each booking, nobody deducts tax at source, and you settle your bill through Self Assessment. More admin and more responsibility, with a wider range of deductible expenses.
- Limited company — your company invoices the pharmacy or agency, pays corporation tax on its profits, and you draw a salary and dividends. The most admin of the three, and only worthwhile where engagements sit outside IR35.
| PAYE (agency or pharmacy payroll) | Self-employed | Limited company | |
|---|---|---|---|
| Who handles tax | Employer or agency deducts tax and NI at source | You, via Self Assessment | Company pays corporation tax; you pay tax on salary and dividends |
| National Insurance | Class 1 (employee) | Class 4 on profits | Class 1 on salary; none on dividends |
| Admin burden | Minimal | Self Assessment, records, payments on account | Statutory accounts, corporation tax return, payroll and Self Assessment |
| Status risk | None — you are taxed as an employee | HMRC may argue the engagement is really employment | IR35 must be considered for every engagement |
| Typical fit | Regular shifts at one or two pharmacies; hospital banks | Genuinely ad-hoc cover across many pharmacies | Higher-earning locums with clearly outside-IR35 engagements |
To compare take-home pay between the routes, start with our self-employed tax calculator — but read the next section first, because the status question decides which routes are actually open to you.
The employment status question
Whether you can work self-employed is determined by the facts of each engagement — not by what you or the pharmacy would prefer, and not by the label on the contract. HMRC's long-standing position is that many community pharmacy locums, measured against the standard status tests, look like workers or employees: they work set shifts booked in advance, under the pharmacy's procedures, with no real ability to send someone else. Many locums nonetheless operate as self-employed, and the sector has lived with this tension for years. The three tests that matter most:
- Control — who decides how, when and where the work is done? A responsible pharmacist running the pharmacy's standard operating procedures during fixed opening hours has limited control over the work itself.
- Substitution — do you have a genuine right to send another suitably qualified pharmacist in your place, and would the pharmacy accept it? A right that exists only on paper carries little weight.
- Mutuality of obligation — is the pharmacy obliged to offer you work, and are you obliged to accept it? A standing rota points towards employment; genuinely ad-hoc cover does not.
In practice, the self-employed position is stronger where you cover one-off or short-notice shifts across many different pharmacies, set your own rates, invoice for your work, carry your own professional indemnity insurance and can genuinely decline or swap bookings. It is weaker where you fill the same shifts at the same pharmacy week after week — at some point that stops looking like a business and starts looking like a job.
Agencies often run locums through PAYE or an umbrella company precisely because of this risk. HMRC's Check Employment Status for Tax (CEST) tool gives an answer HMRC will normally stand behind where the inputs are accurate — run it for each significant engagement and keep the output. If your position is borderline, get advice from specialist medical accountants before relying on self-employed treatment: getting status wrong can be expensive for both the locum and the pharmacy.
Self-employed locum pharmacists: registration and Self Assessment
If you are genuinely self-employed, register with HMRC for Self Assessment by 5 October following the end of your first tax year of trading — though registering as soon as you start is easier. Each year you file a self assessment tax return by 31 January (online) and pay any tax due on the same day.
For 2025/26 you pay Income Tax on profits above the £12,570 personal allowance — 20% basic rate up to £50,270, 40% up to £125,140 and 45% above that (England, Wales and Northern Ireland; Scotland uses different rates and bands). You also pay Class 4 National Insurance: 6% on profits between £12,570 and £50,270 and 2% above. Class 2 National Insurance is treated as paid for most self-employed people with profits above the small profits threshold, protecting your State Pension record at no cost.
Once your Self Assessment bill exceeds £1,000 (and less than 80% of your tax is collected at source), HMRC also requires payments on account — advance instalments towards the following year, due on 31 January and 31 July, each set at half the previous year's bill. The first year catches many locums out: you effectively pay 150% of a year's tax in one go.
As an illustrative rule of thumb only: setting aside 25–30% of profits usually covers tax and National Insurance while you stay within the basic rate band, rising to around 40% on the slice of profits taxed at higher rate. These are round budgeting numbers, not a calculation — run your actual figures through our self-employed tax calculator.
One more date for the diary: from April 2026, Making Tax Digital for Income Tax requires sole traders with qualifying income over £50,000 to keep digital records and send quarterly updates to HMRC, with the threshold dropping to £30,000 from April 2027 — so most full-time self-employed locums will need MTD-compatible software.
Limited company: when it works and IR35
Working through your own limited company means the company invoices the pharmacy or agency and pays corporation tax on its profits — 19% on profits up to £50,000 for 2025/26, 25% above £250,000, with marginal relief in between — while you extract income as a small salary plus dividends. Dividends carry no National Insurance, which is where the saving comes from, although only £500 of dividends is tax-free in 2025/26 and dividend tax applies above that.
The catch is IR35, the off-payroll working rules. Where you work through your company for a pharmacy or agency in circumstances that would otherwise amount to employment, the engagement is inside IR35 and the income is taxed broadly like salary — eliminating the advantage. Each engagement is assessed on its own facts: a portfolio of short bookings for many different pharmacies, with genuine substitution rights and your own terms, strengthens an outside-IR35 position; a long-running regular slot at one pharmacy points inside. For medium and large engagers, the client decides your status; where the client is a small company — as many independent pharmacies are — your company decides, and carries the risk.
A limited company tends to suit higher-earning locums with consistently outside-IR35 engagements, or those building a wider business — consultancy, training or clinical services — alongside locum work. If that is you, we can set up your limited company and handle the accounts, payroll and returns that come with it.
Expenses locum pharmacists can claim
Self-employed locums can deduct expenses incurred wholly and exclusively for the business. The ones that matter most for pharmacists:
- GPhC registration and renewal fees, plus professional body subscriptions that appear on HMRC's approved list.
- Professional indemnity insurance.
- Business mileage between pharmacies. Travel between different sites as a genuinely itinerant locum is claimable; ordinary commuting to a single pharmacy you work at regularly is not — once a site becomes your regular workplace, HMRC will challenge the travel.
- Training and CPD that updates or maintains your existing knowledge. Courses that give you a brand-new qualification are generally not deductible for sole traders.
- Equipment and supplies — reference materials, a business proportion of phone and home-office costs, accountancy fees and software.
If you are paid through PAYE the rules are far stricter: employees can usually only claim expenses they are required to incur and that the employer does not reimburse, and ordinary commuting is never claimable.
VAT, NHS pension and record-keeping
Healthcare services supplied by registered pharmacists are generally exempt from VAT, as services of registered health professionals. Exempt supplies do not count towards the £90,000 VAT registration threshold, so a locum providing only pharmacy services normally never needs to register, whatever they earn. Income that is not exempt healthcare — some consultancy, training delivery or other non-clinical work — can be standard-rated, so take advice if you have mixed income streams.
Pension access is a genuine drawback of pharmacy locum life. Community pharmacy locums generally cannot join the NHS Pension Scheme for their locum work — unlike locum GPs, who have specific arrangements to pension locum earnings. The position can differ for hospital bank shifts and other NHS-employed roles, and scheme rules change, so check the current NHS Pension Scheme rules for your specific situation. Many self-employed locums save into a personal pension or SIPP instead; contributions attract tax relief at your marginal rate.
Finally, record-keeping. Keep an invoice for every booking, a mileage log, receipts for expenses and a separate business bank account — and retain your records for at least five years after the 31 January filing deadline. Good records are also your first line of defence if HMRC ever questions your employment status.
If you also do medical locum work, our locum doctor tax guide covers the equivalent rules for doctors. And if you would rather talk your situation through, book a free accounting consultation — GoForma works with locum pharmacists across PAYE, self-employment and limited companies.