Every NHS dental practice in the UK runs on a contract. The contract determines how much you get paid by the NHS, what you have to deliver to earn it, and what happens if you don't. For most NHS-funded practices, the contract is the single largest line of revenue and the single largest risk on the P&L. Get the mechanics wrong at acquisition or at year-end and the consequences flow through to profit, valuation and exit position.
This guide is the working reference. We cover the UDA system, the differences between contract types (GDS, PDS, ODS), why the UDA value attached to your specific contract is not the national average, how end-of-year reconciliation actually works, what the current reform direction means for your planning, and how contracts transfer at practice sale.
It's deliberately long because the NHS contract is the area where generalist accounting advice goes wrong most often. If you're buying a practice, selling a practice, modelling profit extraction, or thinking about reform exposure, you need this level of detail or you'll miss the things that matter.
What an NHS dental contract actually is
An NHS dental contract is an agreement between a dental practice (the provider) and the relevant NHS commissioning body, under which the provider agrees to deliver a defined volume of NHS dental treatment over the contract year in exchange for an annual contract value.
In England, commissioning is now handled by NHS England regional teams. In Wales, by NHS Wales and Local Health Boards. In Northern Ireland, by the Health and Social Care Board. In Scotland, dental treatment is reimbursed item-by-item under the Statement of Dental Remuneration (SDR) rather than via UDA contracts, so the structure differs significantly there.
For England, Wales and Northern Ireland, the dominant contract mechanism uses Units of Dental Activity (UDAs) as the measurement currency. Different treatments are worth different numbers of UDAs, and the practice has to deliver a contracted total over the year. Each UDA has a monetary value attached to that specific contract — and that's the single most-misunderstood part of how NHS dental funding works.
Why your UDA value is not the national average
There is no national UDA rate. The value of a UDA is a contract-specific number that was determined when the contract was first signed (often during the introduction of the GDS contract in 2006) and has been uplifted by annual contract uplifts in the years since.
In England, current individual contract UDA values typically range from around £15 to over £45 per UDA, with most contracts clustering between £25 and £35. The variance comes from three factors:
- The 2006 baseline — when GDS contracts were introduced, the value of each new contract was calibrated against the practice's historical "test year" gross fees from the old NHS dental system, divided by the practice's contracted UDA target. Practices with high historical fee income relative to UDA volume ended up with high-value contracts; the opposite is also true.
- Annual contract uplifts — uplifts have varied year to year. Some years the percentage has lagged behind cost inflation, materially eroding the real value of a contract over time.
- Commissioner-specific variations — local commissioning teams have at times adjusted contract values for specific reasons (e.g., to attract dental provision to under-served areas, or as part of contract renegotiation at sale).
This is why two practices with identical UDA contracts on paper — say, 8,000 UDAs per year — can have very different annual contract values. One might be earning £200,000 (at £25/UDA), another £280,000 (at £35/UDA), for the same clinical workload. When you're modelling a practice acquisition or comparing two contracts, the per-UDA value is the number that matters, not the headline contract value or the UDA count.
GDS, PDS, and ODS: the contract types explained
NHS dental contracts in England fall into three main types:
GDS (General Dental Services)
The standard ongoing NHS dental contract introduced in 2006. GDS contracts are designed to be continuing — there's no end date — and they cover the standard range of NHS dental treatment for the contracted patient population. The vast majority of NHS dental contracts in England are GDS contracts.
GDS contracts are valued in UDAs. The contract specifies the annual UDA target the practice must deliver and the value the commissioner pays per UDA. Treatment is grouped into three (or, since contract reform, sometimes a different number of) bands, with each band worth a different number of UDAs.
PDS (Personal Dental Services)
A time-limited alternative contract type that was offered alongside GDS. PDS contracts were typically used for specialist provision (e.g., orthodontic-only contracts, prison dentistry, contracts in under-served areas) or for specific local commissioning purposes. Many PDS contracts have either been converted to GDS over time or have expired. New PDS contracts are now rare; if you're acquiring a practice with an existing PDS contract, check the expiry date and renewal terms carefully.
ODS (Out-of-hours / Operational Dental Services)
A separate contract type for out-of-hours dental services. Most practice buyers and sellers won't encounter ODS contracts unless the practice in question runs a specific out-of-hours arrangement.
Wales and Northern Ireland
Wales operates a UDA-based contract system that's broadly similar to GDS but with Welsh-specific contract terms, banding, and value uplifts. Northern Ireland uses a different contract structure altogether (item-of-service based with separate fee schedules). Scotland, as noted, uses the SDR item-of-service fee system without UDAs.
How treatment bands and UDA values work
Under the GDS contract, NHS dental treatment is grouped into bands, with each band worth a different number of UDAs:
- Band 1 (examination, diagnosis, treatment planning, X-rays, basic restoration): 1 UDA
- Band 2 (everything in Band 1 plus more complex treatment such as fillings, extractions, root canals): 3 UDAs
- Band 3 (everything in Band 2 plus laboratory-involved work like crowns, dentures, bridges): 12 UDAs
- Urgent treatment: 1.2 UDAs
- Children's free treatment: bands match adult equivalents
So if your contract pays £30 per UDA, a Band 3 patient (12 UDAs) generates £360 of contract income, regardless of the actual cost of the laboratory work or the clinical time involved. This is the structural mismatch at the heart of NHS dentistry: the UDA system pays the same for a 12-UDA Band 3 case whether the lab fee is £40 or £400.
That mismatch flows directly into the practice P&L. NHS-heavy practices with high Band 3 complexity often run lower margin than UDA targets alone would suggest, because lab fees and materials eat into the per-UDA value. Specialist accounting work in dental separates lab fees out by income stream so the real margin per UDA is visible monthly, not just at year-end.
Patient charges and the practice's share
Patients pay an NHS contribution toward most treatment (with exemptions for under-18s, pregnant women, those on certain benefits, and others). The patient charge for each band is set centrally — for 2025/26, the standard NHS patient charges in England are:
- Band 1: £27.40
- Band 2: £75.30
- Band 3: £326.70
- Urgent treatment: £27.40
Important: the patient charge is collected by the practice but goes towards the contract value, not on top of it. If your contract is worth £200,000 a year, the patient charges you collect reduce the NHS top-up payment correspondingly. The patient charge does not represent additional income — it represents a portion of your contract income paid by the patient instead of by the NHS.
This is one of the most-misunderstood mechanics for new practice buyers. If you're acquiring a practice and the seller's accounts show "NHS treatment income" gross of patient charges, you need to confirm this is the contract value (not contract value plus patient charges, which would be double-counting).
End-of-year reconciliation and clawback
The NHS dental contract is a target-based arrangement. The practice receives monthly payments throughout the year (one-twelfth of the annual contract value, adjusted for delivered patient charges), but at year-end the commissioner reconciles actual UDA delivery against the contract target.
If you've delivered at or above target, you've earned the full contract value. Some commissioners pay a marginal additional rate for over-performance up to a defined ceiling (often 102-104% of target), but this is not guaranteed.
If you've delivered below target, you face clawback. The exact threshold varies, but clawback typically kicks in when delivery falls below around 96% of contracted UDA volume. The unearned portion is recovered by the commissioner, usually by deduction from future payments. A 90%-of-target delivery on a £200,000 contract means roughly £20,000 of clawback, hitting the P&L as a year-end adjustment.
Clawback is the single biggest preventable cash flow shock for NHS-heavy practices. The mechanism for managing it is monthly tracking: every month you compare your UDA delivery for the year-to-date against the proportionate target. If you're tracking behind by mid-year, you have time to course-correct (increasing capacity, prioritising NHS sessions, addressing patient cancellation rates). If you only spot the gap in February, it's too late.
Our practice accounting service includes monthly UDA-vs-target tracking as standard. If you're not getting this from your current accountant, you're carrying clawback risk you don't need to carry.
NHS contract reform: what's actually happening
NHS dental contract reform has been on the policy agenda for years. The current direction (as of the 2025/26 tax year) includes:
- Banding flexibility — adjustments to how UDAs are allocated within bands to better reflect treatment complexity
- Preventive funding — increased emphasis on preventive treatment, with proposals for separately-funded preventive packages
- Recall intervals — alignment with NICE recommended recall intervals (which can be longer than the historical six-monthly default for low-risk patients)
- Carry-over and flexibility — limited carry-over of unused UDAs into the next contract year for some commissioning arrangements
The detail is in flux. Pilots have been run in specific commissioning areas. The Department of Health and Social Care has indicated further reform is intended but the timing and final shape have shifted multiple times. For practice planning purposes, the realistic assumption is that the UDA mechanism continues through 2025/26 with incremental reform rather than wholesale replacement, and that any larger reform would have phased implementation over multiple years.
For a practice owner or buyer, the practical implication is: don't price contract value on assumed reform. Price on the contract as it currently stands and treat reform-related upside (if any) as a bonus, not a baseline. We've seen acquisition deals get into trouble where the buyer assumed reform would deliver upside that hasn't materialised.
NHS contract transfer at practice sale
When an NHS dental practice is sold, the NHS contract has to transfer too. The mechanism depends on the deal structure:
Asset sale
The contract typically transfers via novation, with the commissioner's consent. The buyer applies to be added as the new contract holder; the seller is released from the contract on the completion date. Most commissioners accept clean novations of GDS contracts where the new owner meets the commissioning criteria, but some use the sale as a trigger to renegotiate contract terms. We've seen specific cases where a sale-triggered renegotiation reduced UDA value by 5-10%, materially changing the deal economics.
Share sale
If the buyer is acquiring the seller's existing limited company that holds the contract, the contract stays with the company. No novation is needed because the contracting party hasn't changed. This is one of the reasons share sales of NHS-heavy practices can be attractive — the contract transfer risk is lower. But share sales carry their own risks (inherited liabilities, latent issues in the company's history) that asset sales avoid.
Contract transfer due diligence
For any buyer, the NHS contract documentation is the most important due-diligence item:
- The original contract and any variation letters since signing
- The most recent UDA reconciliation (showing actual delivery vs target for the most recent complete contract year)
- Year-to-date UDA delivery against the proportionate target
- Any clawback notices or commissioner correspondence about under-performance
- Any pending commissioning decisions (e.g., contract restructuring, area-wide renegotiation)
- The practice's CQC registration and inspection history (sometimes used by commissioners as a factor in novation decisions)
NHS vs private mix: the strategic question
Most UK dental practices today run a mixed NHS and private model. The strategic question for principals is the split. NHS provides baseline revenue with low patient acquisition cost (patients come to you because they need NHS treatment); private provides higher margin but requires you to compete for patients.
From a tax perspective, both NHS and private clinical income are VAT-exempt under VATA 1994 Schedule 9 Group 7 when supplied by a registered dental professional in the course of their profession. The borderline is purely cosmetic treatment without a medical purpose — tooth whitening is the classic borderline case HMRC scrutinises. We cover the VAT-on-dental detail in a separate guide.
From a practice planning perspective, the split shapes everything: practice valuation multiples (private-heavy practices typically command higher multiples), staff structure (hygienist throughput matters more on private practices), capacity planning, marketing investment. There's no universally right ratio; it depends on the practice's location, patient demographics, and the principal's preferences. The question to ask each year is: is the current split delivering the margin and lifestyle I want, and is the trend going where I want it to go?
What to do next
If you're already a practice owner:
- Make sure you have monthly UDA-vs-target tracking. If your current accountant isn't doing this, push them to start or consider switching.
- Read your actual contract documentation. Many principals haven't looked at it since signing. Know your per-UDA value, your annual target, your clawback threshold.
- Get a current practice valuation. Knowing the realistic exit value informs every strategic decision; getting it wrong on either side makes for bad planning.
If you're considering buying:
- Insist on seeing the full NHS contract documentation in due diligence, including the most recent reconciliation and any commissioner correspondence.
- Model the deal on the contract as it stands, not on assumed reform.
- Consider the contract novation risk: speak to the relevant commissioner before completion to confirm they'll novate cleanly without renegotiating value.
If you're considering selling:
- Clean up your UDA delivery position 12-24 months before listing. Stable, at-target delivery supports valuation; volatility or recent clawback notices reduce buyer confidence and price.
- Make sure your accounts cleanly separate NHS contract value from patient charges to avoid buyer questions in due diligence.
- Speak to a specialist dental accountant 24 months before sale about BADR and Section 162 incorporation relief — the qualifying period is two years and the planning needs to start early.
Our practice accounting and practice valuation services cover all of these. If you want a 30-minute scoping call on your specific NHS contract position, book one via the form below.