When Buyer and Seller Cannot Settle a Price, They Bet on the Outcome
An earn out defers part of the purchase price and makes it conditional on future performance. It bridges a valuation gap and it reliably produces disputes.
The Gap Being Bridged
Acquisition negotiations frequently stall on a disagreement about the future. The seller believes the business is about to accelerate and prices it accordingly. The buyer sees the same information and applies a discount for the possibility that it does not.
An earn out resolves this by splitting the price. A portion is paid at closing. A further portion becomes payable only if the business achieves specified results over a defined period, usually one to three years.
An earn out is not a compromise on price. It is an agreement to let reality settle the argument, with both sides betting on their own forecast.
Where the Structure Fits
Earn outs appear most often where the valuation gap is largest and hardest to close with information.
| Situation | Why an earn out helps |
|---|---|
| Early stage or high growth target | Forecasts vary enormously and cannot be verified |
| Owner manager continuing in the business | Ties payment to the person who drives results |
| Concentrated customer base | Buyer needs proof the contracts renew |
| Pending regulatory or product milestone | Binary outcome nobody can price |
They are common in professional services, technology and pharmaceutical deals, and less common where the target is a stable asset heavy business whose future is easier to underwrite.
Choosing the Metric
The measure that triggers payment determines how the structure behaves, and each option has a characteristic failure.
Revenue is simple, hard to manipulate through accounting and easy to verify. It also rewards growth achieved by discounting or by taking unprofitable business, since the seller is indifferent to margin.
Profit measures such as EBITDA align better with value but are highly sensitive to cost allocation. Once the target sits inside a larger group, the buyer allocates corporate overhead to it, and every dollar allocated reduces the earn out. This becomes the single most litigated issue in earn out disputes.
Milestones, such as a regulatory approval or a signed contract, are binary and unambiguous. They work only where the value genuinely hinges on a discrete event.
The Structural Conflict
The problem sitting underneath every earn out is that the buyer owns the business during the measurement period and the seller is paid based on how it performs. The buyer controls decisions that directly affect the payment.
A buyer that integrates the target quickly, cuts its sales team, redirects it toward strategic priorities or invests in long term capability will depress short term measured performance. Each of those may be entirely correct for the combined business and each reduces or eliminates the earn out.
Conversely a seller running the business toward the metric may defer necessary investment, push sales into the measurement window and optimise for a number that expires shortly after they are paid.
Neither party needs to act in bad faith for the structure to generate conflict. The incentives diverge by construction.
What the Contract Has to Cover
Experienced drafters address the conflict directly rather than relying on general good faith obligations, which courts interpret inconsistently.
Common protections include a covenant to operate the business consistently with past practice, a cap on overhead allocations charged to the target, a requirement to maintain the target as a separate reporting unit for the measurement period, agreed accounting policies fixed at signing, and an acceleration clause that pays the full earn out if the buyer sells or fundamentally restructures the business.
Dispute resolution usually names an independent accountant to determine calculation disagreements, which is faster and cheaper than litigation.
The Cost of the Bridge
Earn outs get deals done that would otherwise fail, and that is a genuine benefit. The costs are a prolonged period in which the target cannot be fully integrated, ongoing measurement and reporting obligations, a seller with divided loyalties, and a meaningful probability of a dispute at the end.
Some buyers avoid them entirely and simply pay less at closing, accepting that they will lose some deals to buyers willing to defer. Given how frequently earn outs end in argument, that is a defensible position rather than a timid one.
The Bottom Line
An earn out converts a disagreement about valuation into a contract about measurement, which is progress only if the measurement is specified with unusual care. The metric choice, the treatment of allocated overhead and the buyer freedom to operate the business are where these arrangements succeed or fail. The structure is best understood as buying agreement today in exchange for a well defined probability of conflict later.