GDS vs PDS vs ODS: Which NHS Dental Contract Should You Be On?

What GDS, PDS and ODS Contracts Are

If you are a UK dentist working in England, the type of NHS dental contract behind your practice shapes how you are paid, the activity you are committed to deliver, how secure your position is, and how cleanly the practice transfers when you come to buy or sell. The three contract types you will meet are GDS (General Dental Services), PDS (Personal Dental Services) and ODS (Other Dental Services).

This article sets them side by side: what each one is, who tends to hold it, how long it lasts, the security it offers and how it moves on a sale. The aim is to help you recognise quickly which contract you are dealing with and what that means in practice, whether you are reviewing your own arrangement, looking at a practice to buy, or negotiating an associate agreement.

One point applies across all of them. There is no single national UDA value. Each contract's per-UDA figure traces back to the 2006 baseline, when historic fee income was converted into a contract value and an activity target, and it has been uplifted since. So you cannot read across from one practice to another; you read the specific contract in front of you. For how that number is built and what it means, see our explainer on UDA value explained for UK dentists.

The Comparison at a Glance

The table below is the quickest way to see how the three contract types differ on the points that actually matter to a practice owner: what the contract is for, who holds it, how long it runs, the security it gives you and how it transfers on a sale.

Feature	GDS (General Dental Services)	PDS (Personal Dental Services)	ODS (Other Dental Services)
What it is	The standard mainstream NHS dental contract for routine and ongoing care	A local alternative to GDS, often used for specific or specialist provision	Contracting for operational and out-of-hours arrangements outside the mainstream model
How common	The large majority of NHS practice contracts	Now rare	Limited and service-specific
Activity basis	UDA-based, with an annual activity target	UDA-based, with an annual activity target	Commissioned on its own terms, not as a like-for-like UDA practice contract
Term	Open-ended (continues unless ended)	Typically time-limited	Set by the specific commissioning arrangement
Security of tenure	Strong, given the open-ended term	Depends on how long is left to run and the renewal position	Tied to the term and scope of the arrangement
Who holds it	The bulk of general dental practices	Practices on a local or specialist footing	Providers covering operational or out-of-hours needs
Transfer on asset sale	Novation with commissioner consent	Novation with commissioner consent	Subject to the specific arrangement and commissioner
Transfer on share sale	Stays within the company (no novation)	Stays within the company (no novation)	Stays within the company (no novation)
Valuation comfort	Most comparables, best understood by buyers and lenders	Fewer comparables, buyers scrutinise term and renewal	Specialised, assessed case by case

GDS: The Standard Open-Ended Contract

The GDS contract is the standard NHS dental contract in England and the type the large majority of practices hold. It was introduced in 2006 when the old fee-per-item system was replaced with a model built on Units of Dental Activity. Under a GDS contract the practice agrees an annual contract value with its commissioner and a matching UDA target, and delivers that activity across the year in return for payment.

The defining feature of GDS is that it is open-ended. It does not have a built-in expiry date and continues until it is ended by one of the routes set out in the regulations. That permanence is why GDS sits at the centre of most practice valuations: a buyer is acquiring an ongoing contract rather than a clock that is running down, lenders are comfortable with it, and there is a deep pool of comparable transactions to support a price.

Treatment is grouped into bands, and patient charges sit within that framework. A point worth holding onto, because it is often misunderstood, is that patient charges count towards the contract value, not on top of it. The charges patients pay are part of how the contract value is funded, so they do not represent extra income above the agreed figure.

Where GDS fits best:

• Practice owners who want security of tenure and a contract that does not need renewing on a fixed cycle
• Anyone planning to sell, refinance or bring in a partner, because GDS is the most readily understood and most comparable contract type
• Associates joining a practice and wanting a stable base of activity to work against

What to watch:

• The contract is target-based, so under-delivery against the agreed UDAs has to be managed across the year
• The per-UDA value is specific to that contract, so never assume it matches a neighbouring practice

PDS: The Time-Limited, Often Local Contract

The PDS contract is a local alternative to GDS. It was conceived to give commissioners flexibility to arrange provision on a more tailored footing, often for specific or specialist services in a particular area. Like GDS, a PDS contract in England is UDA-based: it carries an annual activity target and a contract value drawn from the same 2006 baseline approach. The everyday running of a PDS practice can look very similar to a GDS one.

The features that set PDS apart are that it is typically time-limited and that it is now rare. The time-limited nature is the point that matters most commercially. Where a GDS contract simply continues, a PDS contract has a term, so the question for any owner or prospective buyer is how long is left to run and what happens at the end. That does not make PDS a problem contract, but it does make the renewal position a central part of any review.

Because PDS contracts are uncommon, there are fewer comparable sales to lean on when valuing a PDS practice, and a buyer or lender will look harder at the specifics. The practical consequence is that you cannot treat a PDS contract as interchangeable with GDS; the term, the renewal outlook and the local commissioning intent all need checking on the actual contract.

Where PDS appears:

• Practices set up on a local or specialist basis under a tailored commissioning arrangement
• Situations where a commissioner historically wanted provision shaped differently from the mainstream model

What to watch:

• The remaining term and the renewal position, which drive the security of the practice and its saleability
• Fewer comparables, so valuation and buyer due diligence focus closely on the contract itself
• Any local conditions attached to the contract that go beyond the standard framework

ODS: Out-of-Hours and Operational Arrangements

The ODS contract, Other Dental Services, sits outside the mainstream GDS and PDS model. It is the route commissioners use for out-of-hours and operational arrangements rather than for a standard general dental practice contract. Because it is commissioned to meet a particular operational need, an ODS arrangement is set up on its own terms rather than as a like-for-like UDA practice contract, and its scope, term and funding follow the specific commissioning agreement.

For most practice owners ODS is not a contract you choose between in the way you might weigh GDS against PDS. It is the framework that applies to a defined operational service. If your interest is an ODS arrangement, the work is to read the specific agreement closely: what it requires, how long it lasts, and how it is funded, because there is no standard template to read across to.

Where ODS fits:

• Out-of-hours and operational provision arranged by a commissioner outside the mainstream practice model
• Situations needing bespoke terms rather than a standard ongoing practice contract

What to watch:

• The terms are specific to the arrangement, so each one is assessed on its own facts
• There are few direct comparables, so any commercial or valuation question is handled case by case

How Each Contract Transfers When You Buy or Sell

One of the most important practical differences between deal structures, rather than between the contract types themselves, is how the NHS contract moves on a sale. This is the same mechanism for GDS and PDS, and it is worth being precise about because it shapes the whole transaction.

On an asset sale, where the buyer purchases the practice's assets and goodwill, the NHS contract does not pass automatically. It is transferred by novation, which requires the commissioner's consent. The commissioner has to agree to release the seller and accept the buyer in their place, and some commissioners treat a change of ownership as a point at which to revisit the contract value, so the consent step is not a formality to take for granted.

On a share sale, where the buyer acquires the company that holds the contract, the contract simply stays within the company. The legal entity that is party to the contract does not change, so there is no novation and no separate transfer of the NHS contract itself. That is one of the structural reasons a share sale can be cleaner from an NHS-contract perspective, although it carries its own wider considerations.

Because this transfer mechanism can make or break a deal timetable, we cover it in full in our guide on transferring an NHS dental contract on a practice sale. If you are reviewing a contract document itself rather than the transfer, our walkthrough of how to read your NHS dental contract takes you through the clauses that matter most.

What About Scotland, Wales and Northern Ireland?

The GDS, PDS and ODS framework described here is the England position. The picture across the rest of the UK is not uniform:

• Wales and Northern Ireland also use a Units of Dental Activity mechanism for the bulk of NHS dental provision, so the underlying activity-based logic will feel familiar, even though the detailed contract arrangements are set within each nation's own system.
• Scotland sits outside the UDA model entirely. It uses the item-of-service Statement of Dental Remuneration (SDR), where fees attach to individual treatments rather than to units of activity against an annual target.

If you practise outside England, take advice from an accountant familiar with your nation's specific dental arrangements, because the contract mechanics, and therefore the financial planning around them, differ.

A Note on VAT

Whichever contract type sits behind your NHS work, the income from providing NHS dental care is exempt from VAT. The supply of dental care by a registered dentist is treated as exempt under Schedule 9 Group 7 of the VAT legislation, so NHS dental income does not carry VAT and does not count towards the VAT registration threshold. The contract type does not change that exempt status. Where a practice also carries out purely cosmetic work with no therapeutic purpose, that element can fall outside the exemption, which is a separate question from which NHS contract you hold.

Which Contract Should You Be On?

For most practice owners the honest answer is that you do not pick freely between GDS, PDS and ODS; you inherit the contract that comes with the practice, and the real task is understanding what you hold and whether it is sound. That said, the differences point clearly in one direction for a typical general practice.

A GDS contract is the most comfortable position to hold. It is open-ended, it is the type the large majority of buyers and lenders understand, and it has the deepest pool of comparable sales behind it, which makes valuation, lending and succession all more straightforward.

A PDS contract is not inferior in itself, and a well-run PDS practice can be an excellent business. The watch-points are its time-limited term and its rarity, so the renewal outlook and the specific terms deserve real scrutiny before you commit to buying or staying.

An ODS contract is a different category. It applies to out-of-hours and operational provision rather than to a standard practice, so the question is not whether to choose it but whether its specific terms are commercially viable for the service it covers.

Practical Next Steps

Whether you are reviewing your own arrangement or assessing a practice to buy, work through these steps:

1. Confirm which contract type you are dealing with, and for a PDS or ODS contract, establish the term and the renewal or end position.
2. Check the per-UDA value on the specific contract rather than assuming a regional figure, and remember that patient charges count towards the contract value, not on top of it. Our UDA value guide explains how to read it.
3. Read the contract document itself for the conditions that bind you, using our guide to reading your NHS dental contract.
4. Plan the transfer mechanism early if a sale is in view, because an asset sale needs commissioner consent to novate the contract, while a share sale keeps it inside the company. See transferring an NHS dental contract on a practice sale.
5. Speak to a dental-specialist accountant who understands how each contract type affects valuation, lending and your wider financial position.

Final Thoughts

The split between GDS, PDS and ODS is less about choosing the perfect contract and more about recognising what you hold and what it means for your security, your activity commitment and your exit. GDS gives you the open-ended, widely understood position most owners want; PDS can work well but carries a term and renewal question; ODS is a specific operational framework rather than a standard practice contract. Get clear on which one applies, read the actual document, and plan the transfer mechanism before you need it.

If you are unsure which contract type sits behind your practice or how it affects your finances and your options on a sale, speak to a dental-specialist accountant. We work with practice owners across all contract types and can help you book a free practice health check to review your position.