What Is an Earn-Out?
An earn-out is a contingent payment mechanism used in M&A deals to bridge a valuation gap between what a buyer is willing to pay upfront and what a seller believes the business is worth. Rather than settling on a single fixed price, the parties agree on an upfront payment plus additional, performance-contingent payments that are only paid out if the acquired business hits agreed-upon financial or operational targets over a defined period after closing — typically one to three years.
Why Do Buyers and Sellers Use Earn-Outs?
Earn-outs show up most often when a buyer and seller have genuinely different views of the future — not when they simply disagree over a known number. A seller might believe a new product line will drive significant growth; a buyer, skeptical of unproven projections, doesn't want to pay for growth that hasn't materialized yet. An earn-out resolves this by letting the seller "prove it": if the projected performance shows up, the seller collects the additional consideration; if it doesn't, the buyer isn't stuck overpaying for a story that didn't play out.
This dynamic is especially common in deals involving early-stage companies, businesses with a recent inflection point (a new contract, a product launch, a change in strategy), or situations where the target's founder or management team is expected to stay on and drive the very performance being measured.
How Earn-Outs Are Structured
A typical earn-out structure has a few core components: the metric (most often cumulative EBITDA or revenue over the earn-out period), the threshold (the performance level required for full payout, often with a floor below which nothing is paid and a cap above which no additional payout occurs), the measurement period (commonly one to three years), and the payment mechanics (lump sum at the end of the period, or staged payments tied to interim milestones).
Because the payout is contingent and delayed, it isn't worth its full face value to either side. A buyer valuing a $30m earn-out payable in two years needs to discount it back to present value, and — just as importantly — needs to probability-weight the outcome, since most earn-outs don't pay out in full. A worked example of exactly this calculation, including how to size an earn-out to bridge a specific valuation gap and how to probability-weight the expected payout, is covered step by step in this Earn-Out Structuring case study.
The Core Tension: Who Controls the Business During the Earn-Out Period
The single biggest source of friction in earn-outs is that the buyer typically controls the acquired business after closing — board seats, capital allocation, overhead allocation — while the seller's payout depends on how that business performs under the buyer's control. This creates an inherent conflict of interest: a buyer has some ability, intentional or not, to influence the very metric the earn-out is measured against (for example, by allocating shared corporate costs to the acquired unit, or delaying investment that would have boosted near-term EBITDA).
This is why earn-out agreements typically include protective provisions for the seller, such as standalone financial reporting, audit rights, and "ordinary course" covenants that require the buyer to run the business consistent with past practice during the earn-out period.
How Earn-Outs Compare to Other Deal Structuring Tools
Earn-outs are one of several mechanisms M&A practitioners use to manage risk and disagreement in a deal. The choice of cash vs. stock consideration addresses a different question — how the buyer funds the deal and how risk is shared going forward — while a working capital peg addresses short-term balance sheet fluctuations around closing rather than multi-year performance risk. Together, these tools form the toolkit associates use to close the gap between what a buyer wants to pay and what a seller wants to receive.
For a hands-on walkthrough of sizing, discounting, and probability-weighting an earn-out — plus the common mistakes that turn a well-intentioned earn-out into a source of post-closing litigation — see the full Earn-Out Structuring case.