Locum pharmacist tax is genuinely more complicated than most professions, because before MTD even enters the picture, you first need to know how you're actually being paid. The same locum can be PAYE through one agency, genuinely self-employed for a direct pharmacy contract, and paid via their own limited company for another. only some of that counts towards Making Tax Digital. Here's how to work out where you actually stand.
Most professions in this situation-guide series have one clear employment status. Locum pharmacists often don't. HMRC has run a long-running examination into how community pharmacy locums are engaged, and different pharmacy groups have reached different conclusions about the same type of shift — some treat locums as genuinely self-employed, others as inside IR35, and arrangements through agencies frequently default to PAYE altogether. Since 30 June 2023, HMRC formally withdrew its old sector-specific guidance on locum pharmacist employment status, leaving individual engagements to be judged on their own facts.
This matters enormously for MTD, because MTD for Income Tax only has one trigger: your gross income from self-employment and property. If a chunk of your locum earnings isn't self-employment income in the first place, it simply never enters the calculation. no matter how large it is.
Establishing which category each engagement falls into is the first step, and it isn't always your choice. it depends on how the pharmacy or agency has assessed the working relationship.
| How you're paid | Counts for MTD? | What happens instead |
|---|---|---|
| PAYE (agency or pharmacy payroll) | No | Tax and NI already deducted at source. Not self-employment income |
| Self-employed sole trader | Yes | Gross receipts count towards your MTD threshold |
| Own limited company (PSC), outside IR35 | No | Company pays Corporation Tax; you draw salary/dividends separately |
| Own limited company (PSC), inside IR35 | No | Taxed like employment via deemed payment. still not MTD's concern |
Many locums combine more than one of these across a working year — PAYE shifts with one agency, a direct self-employed arrangement with a local independent pharmacy, and a limited company for higher-paying trust work. Each stream needs to be identified correctly, because only the genuinely self-employed portion is relevant to MTD.
If you are genuinely self-employed, here's the part that catches people out: working through five different locum agencies does not give you five separate "small" incomes that each fall under the radar. For tax purposes, locum pharmacy work for multiple agencies and pharmacies is normally treated as a single self-employment business, because it's the same trade carried on in the same way. Every self-employed pound you earn, from every agency and every direct engagement, is added into one gross income figure.
If you also have rental property income, that gets added to your self-employment total too — MTD uses one combined figure across self-employment and property. Your PAYE agency shifts and any inside-IR35 limited company income stay outside this calculation entirely, even though they might make up the larger part of your total earnings for the year.
These two rules get confused constantly because they both involve HMRC scrutinising how locums are engaged, but they answer completely different questions.
Asad's PAYE and limited company income, £38,000 combined, play no part in his MTD position. Only his two self-employed pharmacy contracts count, added together as one business: £19,500 + £8,200 = £27,700 — currently under the £50,000 threshold, and under the £30,000 threshold due from April 2027 too, unless his self-employed work grows.
Once you know your self-employed locum income counts, digital record keeping under MTD needs to capture your allowable expenses too, so your quarterly updates reflect an accurate profit figure.
| Expense | Typically allowable? | Note |
|---|---|---|
| GPhC annual registration fee | Yes | £293 (rising to £310 from Sept 2026) |
| Professional indemnity insurance | Yes | Often via PDA or RPS membership |
| PDA / RPS membership | Yes | Professional subscriptions on HMRC's approved list |
| Travel between pharmacies | Yes | Not your regular commute to a single fixed base |
| DBS check renewal | Yes | Where you pay it yourself |
| Uniform / branded clothing | Yes | Not everyday clothing |
| Expenses reimbursed by the agency | No | Can't claim what's already been refunded to you |
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No. MTD for Income Tax only applies to self-employment and property income. If an agency or pharmacy pays you through PAYE (with tax and National Insurance deducted at source), that income is employment income, not self-employment income, and it never counts towards the MTD threshold regardless of the amount.
Yes, if you're genuinely self-employed. Locum work for multiple agencies and pharmacies is normally one self-employment business for tax purposes, not several, so all your self-employed locum receipts are added together as a single gross income figure when checking against the MTD threshold.
No, they're separate rules that solve different problems. IR35 (off-payroll working) decides whether your engagement through a limited company should really be taxed like employment. MTD is about how self-employed and landlord income is reported to HMRC. A pharmacist could be affected by both, either, or neither depending on how they're engaged.
Not for your company's trading income. MTD for Income Tax applies to individuals with self-employment or property income, not to limited companies, which pay Corporation Tax and file separately. It would only become relevant if you personally also have separate self-employment or rental income outside the company.
Yes, if you're self-employed. Your annual GPhC registration fee, professional indemnity cover, and relevant subscriptions (such as PDA or RPS membership) are normally allowable business expenses against your self-employed locum income, reducing your taxable profit.