An earn-out is a deal structure where part of the sale price is paid upfront and the remainder is deferred — paid to you over a period of time after completion, conditional on the practice hitting agreed performance targets.
Earn-outs are not the norm in straightforward dental practice transactions. But they are increasingly common when a buyer is acquiring a principal-dependent practice, when a DSO wants to manage integration risk, or when the valuation gap between buyer and seller is too large to bridge with a clean upfront price. Understanding when earn-outs arise, how they work, and how to negotiate them is essential for any dental practice principal considering a sale.
When Earn-Outs Arise in Dental Practice Sales
Principal Dependency
The most common reason a buyer proposes an earn-out is principal dependency: the practice’s revenue is substantially tied to your personal clinical output. If your clinical chair time generates a significant proportion of practice revenue — and patients are returning for you specifically — a buyer buying on a multiple of historical earnings faces a real risk: that the earnings will fall when you leave.
An earn-out resolves this by linking part of the deferred consideration to what actually happens to revenue after the sale. If the practice sustains, you receive the full consideration. If revenue falls materially, the deferred element is reduced.
Practical threshold: Most buyers start seriously considering earn-outs when the selling principal contributes more than 25–35% of direct clinical revenue. In highly principal-dependent practices (40%+), an earn-out element becomes likely.
Valuation Gap
A valuation gap occurs when the seller’s price expectation and the buyer’s offer price cannot be reconciled at exchange. In a dental practice sale, this typically happens when:
- The practice has had a strong recent performance year that isn’t yet reflected in three years of normalised EBITDA
- The practice has a high-growth private list but not yet the financial history to command the multiple the seller expects
- The seller believes in future income that the buyer cannot see yet
An earn-out bridges this gap: the buyer pays the agreed upfront price based on current verified performance, and the additional element is paid if the future performance the seller believes in actually materialises.
DSO Acquisition Structures
Dental Service Organisations (DSOs) and corporate group buyers frequently use earn-outs as a structural tool, regardless of principal dependency. Their rationale:
- Transition risk management: Post-acquisition patient attrition is the most common reason an acquired practice underperforms. Tying consideration to post-completion revenue protects the buyer if attrition is higher than modelled.
- Retention incentive: An earn-out that requires you to stay on post-completion aligns your interests with the buyer’s during the critical 12–24 month transition period.
- Portfolio financing: DSOs acquiring multiple practices simultaneously spread their acquisition cost by deferring part of consideration across their portfolio.
Earn-Out vs. Deferred Consideration: Understanding the Difference
The terms “earn-out” and “deferred consideration” are often used interchangeably in dental practice sales, but they describe different structures:
- Deferred consideration is the broader term. It means any part of the purchase price paid after completion. It can be fixed — a set amount payable at an agreed future date regardless of practice performance — or contingent.
- An earn-out is a type of deferred consideration where the amount actually paid depends on the practice meeting post-completion performance targets. If performance falls short, the deferred payment is reduced or withheld.
Fixed deferred consideration is generally more seller-friendly: you know exactly what you will receive and when, regardless of how the practice performs under new ownership. An earn-out carries performance risk — but typically attaches to a higher headline price than a clean upfront deal.
In current UK dental M&A, approximately 16% of all dental practice transactions include some form of deferred consideration — rising to over 36% of corporate and DSO transactions. In deals valued above £2 million, deferred consideration in some form has become an expected part of the negotiation.
How Dental Practice Earn-Outs Are Structured
Typical Components
A standard dental practice earn-out has four main parameters:
1. Upfront payment
The amount paid at completion. Typically 60–80% of the agreed total consideration. For a £1,000,000 agreed headline price, the upfront element is typically £600,000–£800,000.
2. Deferred consideration amount
The earn-out element — the remaining 20–40% of headline price. Paid in tranches (usually annual) subject to performance.
3. Performance metric
The measure against which deferred consideration is assessed. In dental practice transactions, the most common metrics are:
- Revenue: Total practice gross revenue maintained above an agreed threshold
- EBITDA: Normalised profit maintained at or above a baseline
- NHS UDA delivery: For NHS or mixed practices, continued delivery at or above a contractual threshold
- Patient retention rate: A specific metric for private practices with a strong registered patient list
Revenue metrics are more seller-friendly (they are easier to achieve and harder for the buyer to manipulate through cost allocation). EBITDA metrics are more buyer-friendly (they tie deferred consideration to genuine business health rather than top-line numbers).
4. Earn-out period
The duration. Standard dental practice earn-outs run 12–24 months post-completion. DSO earn-outs can run to 36 months if they are structuring a significant acquisition. Shorter earn-outs are preferable for sellers; longer ones give buyers more data and protect them against seasonal or one-year anomalies.
Payment Mechanics
Deferred consideration is typically structured as:
- Equal annual tranches over the earn-out period (e.g., £100,000/year for two years)
- Full amount at end of period conditional on sustaining performance throughout
- Sliding scale paying a proportion of maximum based on actual performance
The sliding scale is the most common professional structure and the most equitable: a practice that hits 90% of target receives 90% of the deferred element. A practice that misses badly (say, 60%) receives a proportionally reduced payment.
Key Negotiation Points for Sellers
1. Secure the Upfront Payment
The upfront payment is the only element you have certainty over. In negotiations, prioritise maximising the upfront element rather than the headline price. A £1,200,000 headline with a £600,000 upfront and a poorly structured earn-out is worth less in expected value than a £1,100,000 deal with a £900,000 upfront.
2. Negotiate the Performance Metric
Revenue metrics are almost always preferable to EBITDA metrics for sellers. Revenue is harder to manipulate and simpler to verify. If the buyer insists on an EBITDA metric, ensure the earn-out agreement specifies exactly how EBITDA is calculated — including which management charges, group fees, or intercompany costs can and cannot be allocated to the practice. DSOs sometimes allocate head office overhead to acquired practices, which can reduce apparent EBITDA even when underlying clinical performance is strong.
3. Define Your Post-Completion Role Precisely
Most earn-outs require you to remain involved in the practice post-completion. This is typically structured as:
- Employed dentist: You are employed by the buyer at an agreed sessional or salaried rate, performing clinical sessions in the practice. Your continued clinical contribution protects the patient base.
- Consultancy role: You provide management or oversight support without performing clinical work. Less common but used when the seller is reducing clinical time.
- Exit earn-out: A small number of earn-outs are designed to pay out regardless of continued involvement, tied purely to revenue performance. These are typically paid on shorter timescales and are only possible when principal dependency is demonstrably low.
The terms of your post-completion role — hours, rate, location, authority over clinical staff — must be agreed and documented in the heads of terms and the sale agreement. Ambiguity here is the primary source of earn-out disputes.
4. Include Minimum Performance Protections
Earn-outs can be undermined by buyer actions post-completion: changing fee structures, imposing new group-level charges, restricting marketing spend, closing the dental practice to new patients. Ensure the earn-out agreement includes:
- A covenant that the buyer will operate the practice in a manner consistent with achieving the performance targets
- Restrictions on changes to fee structures, marketing, or clinical capacity during the earn-out period
- Access rights to practice management data and financial records so you can verify reported performance
5. Dispute Resolution
Every earn-out agreement should specify how disputes over earn-out payments are resolved. The most common mechanism is referral to an independent accountant (agreed in advance) who provides a binding determination on disputed calculations. Without this, a dispute ends up in litigation — expensive and time-consuming for both parties.
Tax Considerations for Dental Practice Earn-Outs
Earn-out proceeds are typically treated as capital gains rather than income, provided the earn-out is structured correctly as deferred consideration for the sale of the business. However, the tax treatment depends on the specific structure:
- If earn-out payments are contingent on continued employment and could be characterised as remuneration, they may be taxed as income
- The value of an uncertain earn-out at completion affects the capital gains tax calculation — HMRC guidance on “ascertainable” and “unascertainable” earn-outs applies here
- Business Asset Disposal Relief (formerly Entrepreneurs’ Relief) may apply to the upfront payment but the position on deferred earn-out payments is more complex
This is a complex area that requires specialist tax advice before heads of terms are agreed. Getting the structure right before contracts are drafted is far cheaper than restructuring midway through the transaction.
Earn-Out vs. Clean Exit: Making the Decision
The question sellers most commonly ask is: “Is it better to accept a lower clean price or take a higher price with an earn-out?”
There is no universal answer, but the framework for thinking about it:
Circumstances where a clean exit is worth the price discount:
- You plan to retire or significantly reduce work within 12 months of completion
- The practice has demonstrable principal dependency and you genuinely may not be around to deliver the earn-out
- You need certainty of consideration for personal financial planning purposes
- You have concerns about the buyer’s ability to operate the practice in a way that preserves performance
Circumstances where an earn-out can be the right structure:
- The buyer is a well-resourced DSO or corporate group with a track record of maintaining acquired practice performance
- You plan to continue working clinically post-completion and the earn-out targets are well within reasonable expectations
- The additional consideration is material relative to the clean price alternative
- The earn-out agreement is well-drafted with strong protections against buyer interference
A specialist dental practice broker — one with experience of both DSO and independent buyer transactions — can model the expected value of an earn-out against a clean exit for your specific situation. This analysis should inform your negotiation strategy before you accept heads of terms.
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For more on how buyers approach dental practice acquisitions, see our guide on selling to a DSO vs an independent buyer. For the full transaction process, see our dental practice sale process guide.
Frequently Asked Questions
Are earn-outs common in dental practice sales?
Earn-outs are more common in DSO acquisitions than in independent buyer transactions. Individual buyers (dentists buying their first or second practice) typically prefer clean deals without deferred consideration. DSOs and corporate groups use earn-outs routinely as a risk management tool and to incentivise the selling principal to remain post-completion. Practices with high principal dependency or a valuation gap between buyer and seller expectations are the most likely candidates for earn-out structures.
What is the difference between an earn-out and deferred consideration in a dental practice sale?
Deferred consideration is any part of the sale price paid after completion. An earn-out is a specific type of deferred consideration where the amount paid depends on post-completion performance targets. Fixed deferred consideration (a set amount paid at an agreed date) gives sellers more certainty. An earn-out typically attaches to a higher headline price but carries performance risk.
How long does a dental practice earn-out typically last?
Standard earn-out periods for dental practice sales are 12–24 months post-completion. DSO acquisitions with earn-outs tied to significant deferred consideration sometimes run to 36 months. Shorter earn-out periods are generally preferable for sellers, as they reduce the period of uncertainty and the risk of post-acquisition changes affecting performance.
What happens if the practice underperforms during the earn-out?
Depending on the structure, underperformance either reduces the earn-out payment proportionally (a sliding scale) or, in threshold-only structures, results in no deferred payment for that period. The earn-out agreement specifies the exact mechanism. Sellers should ensure any earn-out agreement includes protections against buyer actions that could artificially depress performance — such as new management charges, fee reductions, or restrictions on clinical capacity.
Can I refuse an earn-out and insist on a clean price?
Yes. Earn-outs are a deal structure, not a legal requirement. If a buyer proposes an earn-out and you do not want one, you can either negotiate a clean price (typically lower) or walk away and find a buyer who will pay clean consideration. A specialist broker will have buyer relationships across both categories and can run a process that produces competitive offers from both DSO buyers (who tend to use earn-outs) and independent buyers (who typically do not).