On 17 July 2026 HMRC published Revenue and Customs Brief 6 (2026): its settled position on the VAT treatment of GMC-registered locum doctors. The brief follows the First-tier Tribunal lead case in Isle of Wight NHS Trust v HMRC [2025] UKFTT 1114 (TC) and replaces the earlier holding position in Brief 9 (2025).
If you run a medical staffing agency, sit on the finance committee of an NHS body or private hospital group, or buy temporary clinical cover, this is not a niche VAT curiosity. It changes a high-volume supply line — and opens a four-year refund window that is easy to overclaim and easy to mess up.
Practitioner notes are already out from Ross Martin, PKF Littlejohn and VATupdate. What follows is the CFO cut: what changed, who can claim, what will strip the net recovery, and the board actions that should land this month.
What HMRC Now Accepts
Item 5, Group 7, Schedule 9 of the VAT Act 1994 exempts “the provision of a deputy for a person registered in the register of medical practitioners.” For years HMRC treated agency-supplied locums as standard-rated staff supplies. The FTT disagreed. HMRC did not appeal. RCB 6 is the operational confirmation.
HMRC’s current position is that supplies of GMC-registered locum doctors may fall within the exemption, including where the doctor is supplied via an employment business. That single sentence is the commercial event. It covers past and present supplies while current legislation remains in force.
The scope is deliberately narrow. The individual must be a GMC-registered medical practitioner performing a role that must be carried out by such a practitioner. The exemption does not extend to:
- allied health professionals
- anaesthesia associates or physician associates, even if GMC-registered
- general staffing or non-medical temporary labour
- roles that do not require a registered medical practitioner
If your mix is “clinical workforce” rather than “GMC doctors doing doctor work,” do not assume a blanket flip to exempt. Misclassification is how refund claims turn into assessments.
Who Should Care — And Why the Buyer Cannot Simply File the Claim
HMRC addresses NHS bodies, private healthcare providers, employment businesses supplying locum doctors, and VAT advisers. The economic pain has often sat with buyers who paid 20% VAT they could not fully recover. The legal claim path is still supplier-led.
Only the person who made the supply and charged the output tax can reclaim overdeclared VAT from HMRC. Buyers need contractual credit notes, commercial negotiation, or a reimbursement route — not a direct claim against HMRC for VAT their agency accounted for. That was baked into the Isle of Wight structure and remains the practical reality under RCB 6.
So the CFO conversation splits:
- Supplier CFOs: quantify overdeclared output tax, model input tax clawback, design the unjust-enrichment answer, file clean claims.
- Buyer CFOs: identify which suppliers charged VAT, open commercial recovery, stop paying VAT on qualifying future supplies, and fix purchase-order / invoice coding so finance does not keep booking irrecoverable VAT by habit.
The Refund Mechanics — RCB 6 Is Specific
If you charged standard-rate output tax, now treat the supplies as exempt, and they fall within the last four years, you may be able to claim. Depending on size, adjust the current VAT return or make an error correction notification. See VAT Notice 700/45 for method rules, time limits and unjust enrichment.
For the dedicated locum route, HMRC wants:
- form VAT652 completed
- email to ccg.locumdoctorsclaim@hmrc.gov.uk
- subject line exactly: Locum doctors claim RCB 6/26
- basis and reason for the claim
- amount claimed, calculation method, and breakdown by prescribed accounting period
- ability to produce source documents on request
HMRC will review claims case by case — unjust enrichment, partial exemption, and supply-chain accounting. It will not process claims where litigation or assurance activity is still live. Large agency claims will be stress-tested.
The Three Traps That Destroy Net Recovery
1. Partial exemption and input tax clawback. Supplies previously treated as taxable are now exempt. Input tax recovered against those outputs may need to be repaid or adjusted. Your claim is a net figure, not a gross Box 1 fantasy. Agencies with heavy overhead will feel this. Run the partial exemption model before you file, using VAT Notice 706 as the baseline.
2. Unjust enrichment. HMRC will not repay output tax if the customer bore the economic burden and you would pocket the refund. In healthcare staffing that is often the whole story: VAT was on the invoice and the trust paid it. You either reimburse customers under HMRC’s reimbursement scheme, prove you bore the burden, or watch the claim shrink. Contract wording, pricing methodology, and customer input-tax recovery all matter. This is where many “huge refund” headlines die.
3. Scope creep. RCB 6 is about GMC-registered locum doctors doing medical-practitioner work. It is not a free pass for every temporary clinical grade on the roster. Claims that blend doctors, AHPs, associates and general bank staff into one exempt pot invite challenge, delay and partial rejection.
Industry commentary splits between “major refund opportunity” and “proceed with caution.” Both are right. The opportunity is real; the net cash is smaller, slower and more contested than the gross output line.
What Changes From the Next Invoice
Historic claims get the attention. Ongoing compliance is where the recurring P&L sits.
Suppliers need to decide, supply by supply, whether the exemption applies now. Productise the liability decision in billing: GMC number validated, role coded as medical-practitioner work, contract path identified, VAT code forced to exempt where criteria are met, rationale retained. Do not leave this to a junior credit-controller override.
Buyers should rewrite AP rules. If a supplier keeps charging 20% on a potentially exempt supply, challenge it. Update framework call-offs and MSAs so VAT treatment is stated, not assumed. For partially exempt groups, upstream liability changes can move residual recovery — treasury and tax need one model.
Watch second-order pricing. Some agencies will hold cash prices while removing VAT. Some buyers will demand the full 20% out of the day rate. Neither is automatic. Price renegotiation belongs in the same workstream as the claim, or you win a refund and lose it on the next rate card.
Board and Audit Committee Actions for the Next 30 Days
- Map the exposure. Pull four years of locum doctor invoices — bought and sold. Separate GMC doctors from other clinical grades. Tag framework vs off-framework, NHS vs private, and whether VAT was charged.
- Build the net model before any claim. Gross overdeclared output tax, less input tax adjustments, less expected unjust-enrichment haircut, less professional fees and cash-flow timing. Present net, not gross, to the board.
- Fix the live billing and AP path. Liability decision trees, system VAT codes, PO matching rules, and a named owner in tax/finance ops.
- Open the commercial track in parallel. Buyer-side recovery letters to agencies; supplier-side customer reimbursement or retention analysis with contracts and pricing evidence on file.
- File clean or wait. If assurance activity or related litigation is open, RCB 6 says HMRC will not process. Do not burn the four-year clock with a half-baked VAT652.
- Brief the audit committee. This sits at the junction of contingent asset, contingent liability (input tax), revenue recognition on any customer credits, and internal control over indirect tax. External audit will ask.
How This Fits the Wider July Tax Diary
RCB 6 is not the only near-term pressure. HMRC’s Agent Update 145 flags the first Making Tax Digital for Income Tax quarterly update deadline on 7 August 2026 for in-scope sole traders and landlords, plus phased mandatory benefits-in-kind payrolling from April 2027. Different workstreams — assign separate owners so locum VAT does not cannibalise MTD or payroll design.
For groups already deep in healthcare VAT — property, contracted-out services, staff hire, partial exemption — RCB 6 is another reason the control framework needs adult supervision. Yesterday’s labour-supply cases were about fraud chains and director liability. Today’s brief is about getting a lawful exemption right. Both punish weak process.
Bottom Line
HMRC has accepted that GMC-registered locum doctor supplies can be VAT-exempt under Item 5, including via an employment business. That is a genuine policy shift with real cash attached — and a narrow, supplier-led claims path heavily conditioned by partial exemption and unjust enrichment.
Treat RCB 6 as a controlled finance project, not a windfall email to the board. Quantify net. Tighten live invoicing. Recover commercially if you are the buyer. File only what you can defend. The tribunal opened the door; HMRC’s brief tells you how to walk through it without tripping the alarms.
Mark Hendy is a PE-facing CFO and tax practitioner. This article is general information, not advice on any specific supply or claim.