What Are GDS, PDS, and ODS Contracts?
If you are a UK dentist working in England, the type of NHS contract your practice holds determines how you are paid, how many units of dental activity (UDAs) you must deliver, and how your practice is valued when you come to sell. The three main contract types are GDS (General Dental Services), PDS (Personal Dental Services), and ODS (Other Dental Services).
This article compares each contract type, explains the practical differences for practice owners and associates, and highlights the financial implications you need to consider. If you are buying a practice or negotiating an associate agreement, understanding which contract type applies is essential.
GDS Contract: The Standard Model
The GDS contract is the most common NHS dental contract in England. It was introduced in 2006 and replaced the old fee-per-item system with a UDA-based model. Under a GDS contract, the practice has a target number of UDAs to deliver each year in exchange for a fixed annual contract value.
How GDS Payments Work
Each practice negotiates a contract value with NHS England (or the relevant local commissioning body). This value is divided by the UDA target to give a UDA rate. For example, a practice with a £200,000 annual contract value and 8,000 UDA target has a UDA rate of £25.00. The practice receives this amount regardless of the actual treatment mix, provided the UDA target is met.
UDA rates vary significantly by region and individual contract. In England, the average UDA rate is roughly £25 to £35, but individual contracts can range from £15 to £45 or more. London and the South East typically command higher rates than the North and Midlands.
Pros and Cons of GDS
Advantages:
- Predictable income stream if you meet your UDA target
- Well understood by accountants and valuers, making practice valuation more straightforward
- Established model with clear performance monitoring
Disadvantages:
- Pressure to hit UDA targets, with financial penalties for underperformance
- Limited flexibility to vary treatment mix without affecting UDA delivery
- UDA rates can be low in some areas, making it hard to cover costs
PDS Contract: The Pilot Model
The PDS contract was introduced as a pilot scheme alongside GDS in 2006. It was designed to offer more flexibility than the standard GDS model. PDS contracts are less common than GDS but still exist in some areas, particularly where local commissioners wanted to test different approaches.
How PDS Differs from GDS
The key difference is that PDS contracts are not necessarily UDA-based. Some PDS contracts use a block payment model, where the practice receives a fixed annual sum with fewer activity targets. Others use a blended model combining a block element with some UDA-style targets. The exact terms depend on the local agreement.
PDS contracts also often include additional requirements around access, quality, and patient satisfaction that go beyond the standard GDS framework. This can mean more administrative work but also more freedom in how you deliver care.
Pros and Cons of PDS
Advantages:
- Greater flexibility in treatment delivery compared to GDS
- Block payment elements reduce the pressure to hit strict UDA targets
- Can be more attractive for practices wanting to focus on quality over volume
Disadvantages:
- Less standardised, making practice valuation harder
- Fewer comparables available for valuation purposes
- May have additional reporting and quality requirements
- Less common, so finding a buyer familiar with PDS can be harder
ODS Contract: The Specialist and Urgent Care Model
The ODS contract covers "Other Dental Services." This is a separate contract type used for services that do not fit within the standard GDS or PDS frameworks. ODS contracts are typically used for:
- Community dental services (CDS) for special needs patients
- Urgent dental care services (e.g., dental access centres)
- Sedation services
- Orthodontic services
- Oral surgery services
How ODS Payments Work
ODS contracts are usually block-funded or activity-based depending on the service type. For example, an urgent dental care centre might receive a fixed annual sum to provide a specified number of appointment slots. An orthodontic ODS contract might be based on units of orthodontic activity (UOAs).
Because ODS contracts are service-specific, the financial terms vary widely. There is no standard UDA rate or contract value formula. Each ODS contract is individually negotiated with the commissioner.
Pros and Cons of ODS
Advantages:
- Tailored to specific patient groups or services
- Can be more stable if block-funded
- Less UDA pressure than GDS
Disadvantages:
- Hard to value for sale purposes due to lack of comparables
- Often lower profitability than GDS or private work
- May have restrictive terms around service delivery
Which Contract Is Best for Your Practice?
There is no single "best" contract type. The right choice depends on your practice's location, patient demographics, and your personal priorities as a practice owner.
If you value predictability and a straightforward valuation model, GDS is likely the best fit. Most dental practice buyers and lenders are familiar with GDS contracts, which makes selling easier. However, you must be comfortable with UDA targets and the associated performance pressure.
If you want more flexibility and are prepared to accept a less standardised model, PDS may suit you. This is particularly relevant if you are in an area where PDS contracts are common and local valuers understand them.
If you run a specialist service or community clinic, ODS is your only option. The key is to ensure the contract terms are commercially viable and that you have a clear exit strategy.
Financial Implications of Contract Type
Practice Valuation
Practice goodwill valuation methods typically rely on earnings-based multiples or percentage-of-fee-income rules of thumb. GDS practices with clear UDA targets and consistent performance are easier to value because there are many comparable sales. PDS and ODS practices are harder to value, which can reduce the pool of potential buyers and affect sale price.
For a GDS practice, goodwill multiples often range from 0.6 to 1.4 times adjusted EBITDA, depending on NHS/private mix and region. A PDS practice might attract a lower multiple because of the uncertainty around future contract terms. ODS practices are typically valued on a case-by-case basis with fewer comparables.
Pension Contributions
All three contract types allow NHS Pension Scheme membership for eligible dentists. The key difference is how pensionable earnings are calculated. Under GDS, pensionable earnings are based on the contract value and UDA delivery. Under PDS and ODS, the calculation depends on the specific payment model. Always check with NHSBSA if you are unsure how your contract type affects your pension contributions.
For a detailed guide on NHS Pension rules, see our NHS Pension Scheme Essentials for Dentists.
Tax and Accounting
The contract type does not directly change your tax position, but it affects your income pattern. GDS practices with stable UDA delivery have predictable income, making tax planning easier. PDS and ODS practices with block payments may have more variable income, requiring careful cash flow management.
If you are an associate working under any of these contracts, your tax treatment depends on your employment status, not the contract type. See our Associate Tax Services for more details.
What About Scotland, Wales, and Northern Ireland?
The GDS, PDS, and ODS contract types apply specifically to England. Other UK nations use different systems:
- Scotland: Uses the Statement of Dental Remuneration (SDR) with item-of-service fees, not UDAs.
- Wales: Uses a different contract structure with its own unit values and rules.
- Northern Ireland: Has its own health board and contract arrangements.
If you practice outside England, consult a dental-specialist accountant familiar with your nation's rules.
Practical Steps for Practice Owners
If you are considering buying a practice or changing your contract type, take these steps:
- Review your current contract terms carefully. Know your UDA target, contract value, and any special conditions.
- Get a professional valuation that accounts for your specific contract type. Our Practice Valuation Services can help.
- Understand the local market. In some areas, PDS contracts are being phased out or converted to GDS. Check with your commissioner.
- Factor in the impact on your NHS Pension. Different contract types can affect your pensionable earnings.
- Speak to a dental-specialist accountant who understands the nuances of each contract type.
Final Thoughts
The choice between GDS, PDS, and ODS contracts is one of the most important financial decisions you will make as a practice owner. Each model has trade-offs between predictability, flexibility, and valuation. There is no universal right answer, but understanding the differences will help you make an informed decision.
If you are unsure which contract type applies to your practice or how it affects your finances, 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.