Locum Pharmacist Tax Guide 2026/27: Self-Employed, Agency PAYE and IR35
How locum pharmacists in the UK are taxed in 2026/27: self-employed vs agency PAYE, allowable expenses, IR35 for locum work, and when VAT registration applies.
How Locum Pharmacists Are Paid and Taxed
Locum pharmacy work in the UK is arranged in several different ways, and the tax treatment follows the working arrangement rather than the job title:
- Self-employed sole trader: the locum invoices pharmacies or agencies directly and is responsible for their own Self Assessment tax and National Insurance
- Agency PAYE: the recruitment agency employs the locum for tax purposes, deducting income tax and NI at source, similar to standard employment
- Umbrella company: a third-party company employs the locum and processes PAYE on assignments arranged through an agency
- Personal service company (limited company): the locum works through their own company, invoicing pharmacies or agencies, with IR35 rules determining whether the engagement is taxed as if it were employment
Many locums use more than one of these structures across their career, or even within the same tax year, which makes accurate record-keeping essential.
Self-Employed vs Agency PAYE
The choice between self-employment and agency PAYE is not always the locum's to make -- many agencies now insist on PAYE or umbrella arrangements, partly driven by IR35 reforms and partly by NHS/pharmacy chain procurement policies.
Self-employment gives locums:
- The ability to claim allowable business expenses against income
- Control over how and when tax is paid (via Self Assessment)
- More administrative responsibility, including keeping accounting records
Agency PAYE means:
- Tax and NI are deducted before payment, similar to an employee payslip
- No ability to offset expenses against that income in the same way as self-employment
- Simpler day-to-day administration, but usually a lower net rate for the same gross pay compared to genuinely self-employed rates
IR35 and Limited Company Locums
Locums who operate through their own limited company must consider the off-payroll working rules (commonly known as IR35). These rules determine whether an engagement should be taxed broadly as if the locum were an employee of the end client, despite invoicing through a company.
Key points for pharmacy locums:
- For engagements with public sector bodies (including many NHS organisations) and medium/large private sector clients, the end client or the fee-payer (often the agency) is responsible for determining IR35 status and issuing a Status Determination Statement
- If an engagement is found to be inside IR35, tax and NI are deducted at source similar to PAYE, even though the locum invoices through a limited company
- If an engagement is outside IR35, the locum's company can pay them via a mix of salary and dividends, which can be more tax-efficient
- Community pharmacy locum work is often shorter-term and lower control than hospital locum work, which can support an outside-IR35 determination, but each engagement should be assessed on its own facts
Because IR35 status is assessed engagement by engagement, a locum could have some assignments taxed as inside IR35 and others outside within the same tax year.
Allowable Expenses for Self-Employed Locums
For genuinely self-employed locums, common allowable expenses include:
| Expense | Notes |
|---|---|
| GPhC annual registration fee | Fully allowable |
| Professional indemnity insurance | Fully allowable |
| Mileage between pharmacy sites | 45p/mile first 10,000 miles, 25p/mile after, for genuinely temporary workplaces |
| Agency commission or introduction fees | Allowable if deducted from your fee |
| DBS check renewal | Allowable |
| Professional body subscriptions | Allowable if relevant (e.g. Royal Pharmaceutical Society) |
| CPD courses maintaining existing skills | Allowable |
| Accountancy fees | Fully allowable |
| Home office costs | Allowable on a reasonable apportioned basis if admin work is done from home |
Ordinary commuting from home to a single regular fixed workplace is not deductible. The key distinction HMRC draws is between travel to a series of genuinely temporary workplaces (deductible) and travel to what is, in substance, a permanent base (not deductible).
National Insurance for Self-Employed Locums
Self-employed locum pharmacists pay Class 4 National Insurance on profits above the lower profits threshold, at the main rate up to the upper profits limit and a reduced rate above it. Class 2 NI has effectively been abolished from April 2024 for most self-employed people with profits above the small profits threshold -- NI credits accrue automatically -- though voluntary Class 2 payments remain available for those below the threshold who want to protect their State Pension entitlement.
Agency PAYE and umbrella company income is instead taxed with standard employee Class 1 NI deducted at source by the payer.
VAT Registration for Locum Pharmacists
Unlike many self-employed trades, locum pharmacists working across multiple pharmacies and agencies can build up a relatively high turnover, especially if working full-time hours at competitive locum day rates. If taxable turnover exceeds the VAT registration threshold in any rolling 12-month period, VAT registration becomes compulsory, regardless of whether you operate as a sole trader or through a limited company.
Once VAT-registered, locums must charge VAT on their fees to agencies or pharmacies (who can usually reclaim it if VAT-registered themselves) and file VAT returns, typically quarterly.
Self Assessment and Record-Keeping
Self-employed and limited company locums (for outside-IR35 income) must file a Self Assessment return by 31 January following the end of the tax year, alongside paying any tax and NI due, plus payments on account for the following year where applicable.
Practical record-keeping tips:
- Keep a mileage log recording dates, pharmacies visited and miles travelled
- Retain remittance advices from every agency and pharmacy you invoice
- Separate self-employment income from any agency PAYE income (shown on a P60 or P45) when preparing your return
- Track IR35 status determinations for each limited company engagement in case of a future HMRC enquiry
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Frequently asked questions
Are locum pharmacists self-employed or employed for tax?
It depends on how the work is arranged. Locums who invoice pharmacies directly as sole traders are usually self-employed. Locums who work through an agency are often paid via PAYE by the agency, or via an umbrella company, particularly where IR35 rules apply. The correct status depends on the actual working arrangement, not just the label used.
Do locum pharmacists need to worry about IR35?
Yes, if working through a personal service company (limited company). IR35 rules determine whether HMRC treats the engagement as disguised employment. For engagements with NHS bodies and other public sector clients, the end client (or agency) is usually responsible for making the status determination under the off-payroll working rules.
Can a locum pharmacist claim mileage between pharmacies?
Yes, self-employed locums can claim mileage using HMRC's simplified mileage rates (45p per mile for the first 10,000 business miles, 25p thereafter for a car) for travel between different pharmacy sites, provided the sites are genuinely temporary workplaces rather than one fixed regular base.
What expenses can a locum pharmacist claim?
Common allowable expenses include GPhC registration fees, professional indemnity insurance, locum agency commission, mileage or travel costs between sites, professional subscriptions, DBS check renewal fees, and accountancy fees. Ordinary commuting to a single fixed regular workplace is not deductible.
When must a locum pharmacist register for VAT?
If your taxable turnover (as a sole trader or limited company) exceeds the VAT registration threshold in a rolling 12-month period, you must register for VAT. Many locum pharmacists working for multiple pharmacies and agencies on a self-employed basis do approach or exceed this threshold, unlike lower-turnover self-employed trades.
Should a locum pharmacist work through a limited company?
It can be tax-efficient for higher earners, particularly by allowing income to be drawn as a mix of salary and dividends, but IR35 status must be assessed for each engagement. If most engagements are inside IR35, the tax advantage of a limited company largely disappears because tax is deducted similarly to PAYE.
How is agency PAYE different from self-employment for a locum?
Under agency PAYE, the agency deducts income tax and National Insurance before paying you, similar to being an employee, and you have no ability to claim work expenses against that income through Self Assessment in the same way a sole trader can. Self-employment gives more control over expenses but requires you to manage your own tax and NI payments.
What National Insurance do self-employed locum pharmacists pay?
Self-employed locums pay Class 4 National Insurance on profits above the lower profits threshold. Class 2 NI has effectively been abolished for most self-employed people with profits above the small profits threshold since April 2024, though voluntary Class 2 contributions remain available to protect the State Pension record for those below it.
Can a locum pharmacist claim GPhC fees and CPD costs?
Yes, GPhC annual registration fees are allowable, as are CPD courses that update or maintain your existing professional skills. Training for a genuinely new qualification (for example, becoming an independent prescriber from scratch) may be treated differently, so check the specific circumstances with an accountant.
How do locum pharmacists working for multiple agencies file their tax return?
If self-employed, all income from all agencies and direct pharmacy engagements is combined into one Self Assessment self-employment page. If some income was paid via agency PAYE, that income is reported separately using the P60/P45 figures, alongside any self-employment income, on the same overall tax return.
Try the calculators
Self-Employed Tax Calculator
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