Can a Locum Dentist Be VAT-Registered?
Yes, a locum dentist can be VAT-registered, but in most cases they do not need to be. The reason is straightforward: dental treatment provided by a registered dental professional is exempt from VAT under the Value Added Tax Act 1994, Schedule 9, Group 7. This exemption covers both NHS and private treatment.
VAT registration is only compulsory if your taxable turnover exceeds the registration threshold. For 2025/26, that threshold is £90,000. But "taxable turnover" means turnover from standard-rated, reduced-rated, or zero-rated supplies, not VAT-exempt supplies. Since most locum work is VAT-exempt, it does not count toward the threshold.
This creates a common misconception: many locum dentists assume they never need to worry about VAT. That is generally true, but there are specific scenarios where a locum dentist can cross the threshold and must register. We cover those below.
What Counts as Taxable Turnover for a Locum Dentist?
For VAT purposes, your turnover is split into two categories: exempt supplies and taxable supplies. Only taxable supplies count toward the £90,000 registration threshold.
Exempt supplies (do not count toward the threshold)
- All dental treatment services you personally provide as a registered dentist, whether NHS or private
- Examinations, fillings, extractions, root canals, crowns, bridges, dentures, and other restorative or preventive treatment
- Orthodontic treatment
- Periodontal treatment
- Oral surgery
Taxable supplies (do count toward the threshold)
- Purely cosmetic treatments without a medical purpose. Tooth whitening is a known borderline case that HMRC scrutinises. If you offer tooth whitening as a standalone service with no linked dental treatment, HMRC may treat it as standard-rated at 20% VAT.
- Sale of dental products such as electric toothbrushes, mouthwash, or whitening kits (unless supplied as part of a wider treatment plan)
- Any other non-dental services or goods you sell
- If you operate through a limited company and the company provides non-dental services, those may be taxable
If your taxable supplies exceed £90,000 in any rolling 12-month period, you must notify HMRC and register for VAT. This applies even if most of your income is from exempt dental treatment.
Does a Locum Dentist's Total Income Matter for VAT?
No. Your total income from all sources is irrelevant for VAT registration. Only your taxable turnover matters. A locum dentist earning £150,000 per year from NHS and private dental treatment does not need to register for VAT, because all that income is VAT-exempt.
But if that same dentist also runs a side business selling whitening kits online and that side business turns over £95,000, the dentist must register for VAT on that side business. The dental income remains exempt.
This is a key distinction that many locum dentists misunderstand. HMRC looks at the nature of each supply, not the total amount you earn.
What Happens If a Locum Dentist Voluntarily Registers for VAT?
You can voluntarily register for VAT even if your taxable turnover is below £90,000. For most locum dentists, voluntary registration makes no sense because:
- You cannot charge VAT on your dental treatment (it is exempt)
- You cannot reclaim input VAT on your expenses because your supplies are exempt (partial exemption rules apply)
- You add administrative burden with no financial benefit
However, if you have a mix of exempt and taxable supplies, voluntary registration might allow you to reclaim some input VAT. This is a niche scenario and requires professional advice. For the typical locum dentist, voluntary registration is not recommended.
Locum Dentists Working Through a Limited Company: VAT Implications
If you operate as a locum dentist through a personal service company (PSC), the company is the entity that makes supplies. The same VAT rules apply: the company's turnover from dental treatment is exempt. But the company may also have other income streams.
One trap: if your PSC provides non-dental services to a practice, such as practice management consultancy or training, those services may be standard-rated. If that non-dental income exceeds £90,000, the company must register for VAT on that part of its business.
Also, if your PSC is caught inside IR35 and the practice treats you as an employee for tax purposes, your income is employment income, not business turnover. That does not change the VAT treatment of the underlying dental services, but it does affect who is responsible for VAT compliance.
For more on the tax structure for locum dentists, see our guide on locum dentist tax planning.
What If a Locum Dentist Provides Cosmetic Treatments?
This is the most common scenario where a locum dentist might need VAT registration. Purely cosmetic treatments without a medical purpose can be standard-rated for VAT. Examples include:
- Standalone tooth whitening (not linked to any other treatment)
- Cosmetic bonding for purely aesthetic reasons
- Veneers placed solely for appearance with no functional or medical need
HMRC looks at the medical purpose of the treatment, not whether it is NHS or private. If a treatment has a clear medical purpose (e.g., restoring function, treating disease, preventing deterioration), it is exempt. If the sole purpose is cosmetic enhancement, it may be standard-rated.
If you provide a mix of exempt and standard-rated treatments, you must track each type separately. If your standard-rated turnover exceeds £90,000, you must register for VAT on that part of your business. You may also need to apply partial exemption rules to reclaim input VAT on overheads.
This area is fact-sensitive. HMRC has issued guidance on tooth whitening and cosmetic dentistry. If you offer these services, you should take specific advice.
How to Monitor Your VAT Position as a Locum Dentist
Even if you are confident your turnover is exempt, you should monitor your taxable supplies regularly. Here is a practical approach:
- Keep a running total of all income from non-exempt sources (cosmetic treatments, product sales, consultancy)
- Check this total against the £90,000 threshold at the end of each month
- If the rolling 12-month total exceeds £90,000, notify HMRC within 30 days
- If you are close to the threshold, consider whether you can restructure your services to stay below it (but do not artificially split supplies)
If you do need to register, you must charge 20% VAT on your standard-rated supplies from the date of registration. You cannot backdate it. Late registration penalties apply if you miss the deadline.
For a full breakdown of how VAT interacts with different income streams, see our dental accountants page.
Common Questions Locum Dentists Ask About VAT
Do I need to charge VAT on my locum fees?
No. Your locum fees for providing dental treatment are VAT-exempt. You do not add VAT to your invoices, and the practice cannot reclaim input VAT on your fees.
What if I sell dental products to patients?
If you sell products such as toothbrushes, mouthwash, or whitening kits separately from treatment, those sales are standard-rated at 20% VAT. If you supply them as part of a treatment plan (e.g., a take-home whitening kit included in the treatment fee), the whole supply may be exempt if the treatment itself is exempt. This is a grey area; HMRC looks at the single supply versus multiple supply question.
Can I reclaim VAT on my expenses if I am not VAT-registered?
No. Only VAT-registered businesses can reclaim input VAT on their purchases. If you are not registered, the VAT on your expenses is a cost you bear. This is one reason to consider whether voluntary registration might benefit you, though for most locum dentists it does not.
What if I work through an agency?
If an agency engages you and pays you, the agency may be the one making supplies to the practice. Your VAT position depends on your contract with the agency. If you are self-employed and invoice the agency, your dental treatment remains exempt. If the agency treats you as an employee, VAT does not apply to your wages.
Summary: When a Locum Dentist Must Register for VAT
For the vast majority of locum dentists, VAT registration is not required. Your dental treatment income is exempt, and it does not count toward the £90,000 threshold. You only need to register if:
- You provide standard-rated services (e.g., purely cosmetic treatments) and those services exceed £90,000 in a rolling 12-month period
- You sell goods (e.g., dental products) and those sales exceed £90,000
- You have other non-exempt business income that pushes you over the threshold
If you are unsure whether any of your services are standard-rated, or if you are close to the threshold, speak to a dental-specialist accountant. The rules are fact-specific, and getting it wrong can mean penalties and interest on unpaid VAT.
For tailored advice on your specific situation, contact our team of dental accountants who understand locum work.