Here is a number worth sitting with before you sign anything.
According to SRS Acquiom's 2024 M&A Claims Insights Report, which analysed more than 850 private-target acquisitions valued at approximately $168 billion, earn-outs pay out around 21 cents on the dollar. Not on deals that fail. On all deals that include an earn-out. Across every sector outside life sciences, for every dollar of maximum earn-out potential that sellers negotiated, they received roughly twenty-one cents.
Of the deals that paid anything at all, about half the maximum potential was collected. But a significant proportion paid nothing.
Nearly 28 percent of earn-outs were contested. Of those that eventually paid something, 17 percent required renegotiation to avoid litigation.
These are not numbers from failed companies. They are numbers from transactions that closed, businesses that continued to operate, deals where both sides believed they had agreed something workable. The earn-out was supposed to bridge the gap between what the buyer would pay upfront and what the seller believed the business was genuinely worth. For most sellers, that bridge did not hold.
Why earn-outs exist in the first place
When a buyer and seller cannot agree on price, an earn-out is the mechanism that lets the deal happen anyway. The seller accepts a lower upfront payment in exchange for the right to earn additional consideration if the business performs to an agreed standard, usually revenue or EBITDA, over a defined period after close.
In theory, this aligns interests. The seller stays motivated. The buyer pays for performance rather than promise. Everyone wins if the business does what the seller said it would.
In practice, the alignment is more fragile than it looks. The moment the deal closes, the buyer controls the business. The seller controls very little. And the decisions a buyer makes in the first twelve months, about staffing, systems, integration sequencing, shared services, pricing, and customer prioritisation, can determine whether the earn-out target is achievable before the seller has any meaningful opportunity to respond.
The operational problem nobody is solving in the data room
Most earn-out disputes are framed as legal problems. The language was ambiguous. The metric was poorly defined. The accounting treatment was contested. The buyer did not use commercially reasonable efforts.
These are real problems. But they are symptoms. The underlying cause is usually something that happened much earlier: the due diligence process examined the business as it existed but did not seriously interrogate whether the operational conditions that produced the earn-out projections would survive the transaction itself.
Consider what earn-out projections are typically based on. Historical revenue growth, extrapolated forward. Customer retention assumptions drawn from existing relationships. Margin assumptions that reflect current supplier terms, staffing costs, and operational efficiency. In a founder-led or owner-managed business, all of those conditions may be partially or entirely dependent on the continuing presence and involvement of the seller.
When the seller exits, the conditions change. Revenue growth slows because key customer relationships were personal. Margins compress because preferential supplier terms were informal and non-transferable. Operational efficiency drops because institutional knowledge was not documented and cannot be reconstructed quickly.
None of this appears in the financial model. None of it is captured in the earn-out structure. And none of it was examined during due diligence, because due diligence looked at the numbers and not at what was holding the numbers up.
The earn-out is then measured against projections built on conditions that no longer exist. The dispute that follows is real, but the outcome was largely determined before anyone signed anything.
The integration problem nobody wants to name
There is a second issue that the data reflects but practitioners rarely say plainly.
Earn-outs and integration are structurally in conflict.
A buyer who has just acquired a business wants to integrate it. Shared services, consolidated systems, rationalised headcount, aligned pricing. These are legitimate value-creation activities. They are also exactly the kinds of changes that can destroy the operational conditions on which an earn-out target was premised.
An integration specialist writing in a 2024 analysis of the earn-out problem put it directly: she had seen many businesses come to market that had not been integrated because earn-outs were used as the reason to delay. Integration would happen once the earn-out period ended. Except by then, business focus had moved on. A new acquisition, a new product launch, an exit. Starting a hundred-day integration plan three years after close is, in her words, an unlikely scenario.
SRS Acquiom's own transaction data found that only 3 percent of 2024 earn-outs included a covenant requiring the buyer to run the business in a way that maximises the earn-out payment. Only 3 percent included a covenant to run the business consistent with past practices. In other words, in 97 percent of deals with earn-outs, the buyer was legally unconstrained in its ability to make integration decisions that directly affected the earn-out outcome.
That is not a drafting failure. It is a structural reality. Buyers will not accept provisions that prevent them from managing what they just paid for. The tension cannot be fully resolved in the SPA. It can only be managed, and the way to manage it is to understand, before close, exactly which operational conditions the earn-out depends on and whether those conditions are genuinely transferable.
What this means if you are a seller
If you are a founder or owner-manager with an earn-out attached to your sale, the question worth asking before you accept the structure is not whether the legal drafting is sound. It is whether the business can hit the target without you.
That is a different question, and it requires a different kind of assessment.
It requires understanding which customers are genuinely contracted and operationally integrated into the business versus which are buying because of a relationship with you personally. It requires understanding which supplier terms are formal and which are informal arrangements that exist because of your history with the people involved. It requires understanding whether your management team can operate at the level the projections assume, without your informal authority and institutional knowledge backing them up.
If the honest answer to any of those questions is uncertain, the earn-out is carrying risk that the financial model does not show. That risk will not be shared equally. The buyer controls the business. The buyer controls the decisions. And when the earn-out period ends with less paid than expected, the dispute process is expensive, slow, and rarely produces outcomes that approximate what the seller believed they had agreed to.
The most effective protection for a seller is not a better earn-out clause. It is entering the earn-out period with a business that has already reduced its dependency on the seller, formalised its key commercial relationships, and built the operational depth to perform to the target under new ownership. That is work that needs to happen before the sale process begins, not after it closes.
What this means if you are a buyer
If you are acquiring a business with an earn-out attached, the earn-out is not a risk-transfer mechanism. It is a risk-deferral mechanism. The operational risks that will determine whether the earn-out is achieved are present in the business on the day you sign. They will not become visible until later. And when they do, they will arrive simultaneously with the integration challenges you are already managing.
The questions worth asking before close are not only about how the earn-out is structured. They are about whether the operational conditions underpinning the projections are real and transferable. Whether the customer base will hold under new ownership. Whether the margins are sustainable without the seller's informal supplier relationships. Whether the management team is genuinely capable of delivering the projected performance independently.
These are operational questions. They require operational assessment. And they are far cheaper to answer before signing than after, when the answer arrives in the form of a dispute, a renegotiation, or a write-down on a deal that looked, on the day it closed, like exactly what everyone wanted it to be.
Diadem Advisory provides operational due diligence for mid-market acquisitions. If you are entering a transaction with an earn-out and want to understand whether the operational conditions support the projections, contact us.
This article is intended for general informational purposes only and does not constitute legal, financial, or professional advice. Readers should obtain independent professional advice tailored to their specific circumstances before making any acquisition, investment, or business decision.
This article was researched and written with the assistance of artificial intelligence tools.