Key takeaways
- The metric selection in an earnout negotiation is more important than the earnout amount.
- GAAP revenue with clear exclusions is more defensible than EBITDA, which is adjustable.
- Insist on audit rights and periodic reporting obligations in the earnout agreement.
- Caps, floors, and acceleration provisions are all negotiable and all matter.
- An earnout you can measure yourself is the only earnout worth accepting.
EBITDA earnouts pay out in full 38 percent of the time. Revenue earnouts pay out in full 61 percent of the time. The difference reflects the structural reality that EBITDA is far more susceptible to post-close manipulation through overhead allocation, accounting policy changes, and integration costs than revenue is (SRS Acquiom 2024).
72 percent of earnout disputes involve disagreement about measurement methodology, not whether the business underperformed. The underlying performance may have been fine, the issue is how the metric was calculated (SRS Acquiom 2024).
Average earnout dispute resolution cost: $180,000 to $450,000 in legal and arbitration fees. Earnouts with pre-agreed, specific accounting methodology are 58 percent less likely to result in litigation.
When a buyer proposes an earnout, the conversation typically focuses on the amount: how large is the earnout, what percentage of the deal does it represent, and what target does the business need to hit. The conversation that actually determines the outcome, the one that most founders do not have until it is too late, is about metric definition. How is the metric calculated? Who controls the inputs? What happens if the buyer changes overhead allocation, accounting policy, or shared service structure after close?
Revenue earnouts: lower risk, but still risky
Revenue earnouts are simpler than EBITDA earnouts and less susceptible to post-close allocation manipulation, which is why they pay out in full more often. But revenue is not a self-defining term. The specific questions that determine a revenue earnout outcome include: Is it recognized revenue or bookings? Is it net of returns and allowances? Does it include revenue from acquisitions the buyer makes during the earnout period? What happens when the buyer consolidates pricing with a related entity? What recognition timing methodology applies, percentage of completion, invoice date, delivery date?
61%
Revenue earnouts paying in full (SRS Acquiom 2024)
38%
EBITDA earnouts paying in full
72%
Disputes over methodology, not performance
$180-450K
Average dispute resolution cost
A distribution business with a revenue earnout tied to net revenue may find that the buyer, post-close, applies a different return allowance policy that reduces recognized revenue. A services business may find that the buyer attributes certain revenue to the corporate parent rather than the acquired entity. These are not necessarily bad-faith actions, they are the result of undefined terms being applied consistently with the buyer's internal accounting policies rather than the seller's prior practices.
EBITDA earnouts: the higher-risk structure
EBITDA earnouts carry substantially more risk for sellers because EBITDA is a function of operating decisions the buyer controls entirely after close. Understanding EBITDA quality before negotiations is essential. The three most common EBITDA earnout manipulation vectors, not necessarily intentional, are overhead allocation, shared service charges, and integration cost treatment.
The problem with EBITDA earnouts is not that buyers act in bad faith. It is that buyers act in their own interest, which is rational, and their operating decisions can dramatically change measured EBITDA at the subsidiary level without any change in the underlying business.
Overhead allocation is the most common issue. After close, a PE firm will often allocate shared services costs, finance, HR, IT, legal, insurance, across its portfolio companies on a formula basis. If the acquisition is a new addition to an existing platform, that allocation can be substantial. A $1.4 million shared services allocation to a business generating $3 million of pre-allocation EBITDA eliminates 47 percent of measured EBITDA without any change in the business's actual operations.
What happened in a real dispute
A $28M distribution business sold with $3M in EBITDA earnout tied to achieving EBITDA of $4.5M or more in year 1. Pre-close trailing EBITDA was $5.8M, suggesting meaningful headroom. Post-close, the buyer, a PE-backed platform, allocated $1.4M of shared services overhead to the subsidiary as part of standard integration. This reduced measured EBITDA from $5.8M to $4.4M, just below the $4.5M threshold. The earnout paid $1.1M of the $3M target, the tiered structure awarded partial payment for performance between $3.8M and $4.5M. The founder challenged the overhead allocation. The parties entered arbitration. 18 months later, they settled at $1.9M total, net of $380,000 in combined legal and arbitration fees. The dispute would have been prevented by a single provision in the purchase agreement specifying that overhead allocations during the earnout period could not exceed the company's pre-close standalone overhead expense.
This case illustrates the fundamental problem with EBITDA earnouts as typically structured: the measurement methodology is described in general terms in the LOI, then drafted in legal language in the purchase agreement that still leaves critical questions unanswered. The overhead allocation question, who pays for shared services, at what cost, allocated on what formula, is almost never addressed explicitly at the LOI stage.
How to define the metric with specificity
Earnout Metric Definition Checklist
1. EBITDA definition
Specify what is included and excluded: interest, taxes, depreciation, amortization, one-time items, stock-based compensation, owner add-backs during the earnout period.
2. Overhead allocation methodology
Set a cap on allocated overhead (for example, no more than actual standalone overhead in the pre-close period) or specify the allocation formula and exclude any increases above a defined threshold.
3. Integration cost treatment
Explicitly exclude all buyer-side integration costs, transaction expenses, and restructuring charges from the earnout EBITDA calculation.
4. Accounting policy consistency
Require the buyer to maintain the seller's pre-close accounting policies for revenue recognition, expense capitalization, and depreciation during the earnout period, unless required by GAAP.
5. Reporting and audit rights
Require monthly financial statements in the same format as the pre-close management package. Require the right to dispute results within 30 days of receiving earnout statements, with an independent accountant as the dispute resolver.
6. Change-of-control acceleration
If the buyer sells the business during the earnout period, require immediate payment of the remaining earnout at target, eliminating the risk that a subsequent buyer changes operating policies.
Frequently asked questions
Should I negotiate earnout terms at the LOI stage or wait for the purchase agreement?
Negotiate the metric definition at the LOI stage. The LOI sets the framework that the purchase agreement operationalizes. If the LOI says only "EBITDA earnout tied to $4.5M target," the purchase agreement will define EBITDA by reference to the buyer's standard accounting policies, which may not be what you intended. Insist on a one-paragraph EBITDA definition appendix to the LOI that addresses overhead allocation, integration costs, accounting policy consistency, and reporting rights.
What is an earn-in vs. an earnout?
An earnout pays the seller contingent consideration after close based on performance. An earn-in (sometimes called a reverse earnout or deferred purchase price) reduces the purchase price if performance falls below a threshold. Earn-ins are less common but create a different incentive structure, instead of upside for the seller, there is downside risk below a floor. Both require the same careful metric definition to avoid disputes.
Work with Glacier Lake Partners
Request the Earnout Metric Definition Checklist
Most useful before LOI signing when earnout terms are first being negotiated. The metric definition should be agreed at LOI stage, not deferred to the purchase agreement.
Start a Conversation →Research sources
Explore adjacent topics
