If you've spent any time researching the sale of your business, you've probably encountered the word earnout. It appears in offer letters, purchase agreements, and advisory conversations, usually accompanied by language about "bridging the valuation gap." What it's rarely accompanied by is a plain-language explanation of what an earnout actually means for you as a seller, and why it carries risks many sellers don't fully appreciate until after they've signed.
What Is an Earnout?
An earnout is a contractual provision under which the seller receives additional consideration, beyond the amount paid at closing, if the acquired business achieves specified performance targets during a defined period post-close. The buyer pays an agreed amount at close; if the business hits the milestone, the seller gets the earnout payment; if not, they receive nothing beyond the upfront amount.
An earnout is the buyer's answer to uncertainty. It is the seller's problem if that uncertainty does not resolve in their favor.
Earnouts appear in 20–30% of private company acquisitions. Because earnout value is typically a multiple of EBITDA, the same metric anchoring the base price, our guide on what EBITDA is is worth reviewing before you evaluate any earnout proposal.
Buyers propose earnouts when there's a gap between what they'll pay based on historical performance and what the seller believes the business is worth based on projected performance. The most common reasons: valuation gap on projected performance, key-person transition risk, customer concentration or contract uncertainty, and high-growth businesses with limited operating history.
How an Earnout Is Structured
The metric. Revenue-based earnouts are less susceptible to manipulation through expense allocation, but create incentive misalignment. EBITDA-based earnouts are more common but carry real risk: the buyer controls the post-close expense base, which affects the calculation in ways the seller can't control.
The period. Typically one to three years, with two being most common. A multi-year period with a cumulative catch-up provision sounds seller-friendly but effectively doubles the time before the seller knows whether the earnout paid out.
The payment structure. Binary trigger (full amount or nothing) is simplest but least seller-friendly. Linear/proportional pays a percentage matching the percentage of target achieved. Tiered/stepped divides the earnout into tranches at different performance levels, providing downside protection while preserving upside.
The amount. Typically 10–30% of total enterprise value. The larger the earnout as a proportion of consideration, the more important robust protective provisions become.
An earnout representing 40% of transaction value with a binary trigger, an EBITDA metric, and no operating covenants is effectively a situation where the buyer has agreed to pay 60 cents on the dollar today and 40 cents at their own discretion. That is not a valuation bridge, it is an option the buyer purchased at your expense.
When an Earnout Is Appropriate
An earnout is most legitimate when tied to a single, identifiable forward risk, not the general question of whether the business will keep performing. Appropriate uses include: retention risk on a recently won major customer, founder transition risk where you remain engaged during the earnout period, and high-growth businesses with limited operating history where the historical earnings base doesn't yet support the seller's valuation.
The critical question before accepting any earnout: is this bridging a specific, genuinely uncertain forward risk, or simply reducing the buyer's upfront commitment for earnings already demonstrated in the historical record? If the latter, it's not a bridge, it's a discount, and should be negotiated against.
When Earnouts Go Wrong
Studies estimate 30–50% of earnouts fail to pay out in full. The most common cause is the expense allocation problem: without contractual restriction, a buyer can allocate shared costs, management fees, IT overhead, insurance, to the acquired business, reducing reported EBITDA without any change in underlying performance. Strategic decisions that are rational for the combined enterprise, redirecting sales resources, bundling product lines, can also depress standalone results without bad faith.
When the metric is EBITDA and the agreement doesn't specify methodology in detail, disputes are almost certain, and they're expensive, slow, and often end in litigation. A detail many sellers overlook: earnout language is often effectively set in the LOI, long before the purchase agreement is drafted. Our guide on 5 LOI gotcha clauses covers vague earnout language among the provisions that cost sellers the most after exclusivity is granted.
The Protective Provisions Every Earnout Should Include
If an earnout is unavoidable, the minimum standard of protection includes: an ordinary course operating covenant requiring the buyer to run the business consistent with pre-close operations; a restriction on new or increased shared-cost allocations without seller consent; an independent measurement mechanism for disputed calculations; a precisely defined EBITDA methodology if that's the metric; acceleration on change of control so a mid-earnout sale triggers full payment; and an anti-sandbagging covenant prohibiting deliberate management toward a missed target. A three-word EBITDA definition is a dispute waiting to happen, so if EBITDA is the metric, review our full guide What Is EBITDA? to understand every component of the calculation and make sure your purchase agreement defines each one explicitly for earnout measurement purposes.
Earnouts and Taxes
Tax treatment of earnout payments is complex and requires guidance from a qualified CPA; what follows is general orientation, not tax advice. Earnout payments characterized as additional purchase price are generally taxed as capital gains, the most favorable treatment. Payments structured to compensate for continued services may be characterized as ordinary income instead. Purchase agreements should be drafted carefully to characterize earnout payments as consideration for the sale, not compensation for services. This interacts directly with whether the deal is structured as an asset sale or stock sale; our guide on asset sale vs. stock sale tax implications covers the full treatment of each.
An earnout is either a fair bridge or an expensive option the buyer purchased at your expense. Know which one you are accepting before you sign.