Among all the deal structure tools available in lower middle market M&A, earnouts are simultaneously the most creative and the most contentious. They are the mechanism that buyers use when they believe a business is worth significantly more than its current earnings justify — and that sellers accept when they are convinced their business is performing better than historical numbers suggest. In theory, an earnout perfectly aligns the interests of buyer and seller around future performance. In practice, earnout provisions account for a disproportionate share of post-closing disputes, litigation, and damaged business relationships. Understanding how earnouts actually work — and when they genuinely make sense for sellers — is essential knowledge for any business owner entering a sale process.

Data from M&A transaction surveys, including research published by SRS Acquiom (a post-closing services firm that manages earnout payments across thousands of transactions), shows that earnout disputes are among the most common sources of post-closing conflict in business acquisitions. Their research found that a significant percentage of earnout targets are not met by the buyer's post-closing management, whether due to legitimate business conditions or to buyer-controlled decisions that affected the earnout calculation. Understanding this dynamic before agreeing to earnout terms is critical to protecting the seller's interests.

What Is an Earnout?

An earnout is a contingent post-closing payment from the buyer to the seller, tied to the business achieving defined performance milestones after the transaction closes. A typical earnout structure might provide for an additional payment of $1M to the seller if the business achieves $500K in EBITDA in the 12 months following closing, on top of a base purchase price of $3M that has already been paid. The earnout allows the buyer to justify paying a higher total price than they would commit to on a purely backward-looking basis, while protecting their downside if the business fails to perform as the seller projected.

Earnouts are most commonly proposed in situations where there is a meaningful valuation gap between buyer and seller — where the seller believes the business is growing into a higher value that the current financials do not yet fully reflect, and the buyer is unwilling to pay for potential rather than demonstrated performance. They are also common in transactions where the business is highly dependent on the selling owner's continued involvement, as the earnout creates an incentive for the seller to remain engaged and drive performance during the transition period.

Common Earnout Structures

Earnouts can be structured in many ways, and the specific structure matters enormously to the practical outcomes for both parties. The most common structures include:

• Revenue-based earnouts: Payment is triggered when the business achieves a defined revenue threshold. Revenue is harder for the buyer to manipulate than EBITDA, making revenue-based earnouts generally more seller-friendly. The tradeoff is that revenue-based earnouts do not account for margin changes that affect the buyer's economics
• EBITDA-based earnouts: Payment is triggered when EBITDA reaches a defined level. These are more common but more susceptible to buyer manipulation through expense allocations, accounting choices, and investment decisions that depress EBITDA during the earnout period
• Gross profit-based earnouts: A middle ground between revenue and EBITDA — harder to manipulate than EBITDA, more sensitive to profitability than revenue alone
• Milestone-based earnouts: Payment is triggered by the achievement of specific non-financial events — winning a specific customer, receiving a regulatory approval, completing a product development milestone. These are common in industries where binary events drive value, such as healthcare, technology, and regulated businesses
• Cumulative vs. annual earnouts: Cumulative earnouts measure performance over the entire earnout period (typically 2–3 years); annual earnouts measure year by year. Cumulative structures are generally more seller-friendly because a strong year can compensate for a weaker one

?️ Earnout Protections Sellers Must Negotiate

A seller who agrees to an earnout without adequate contractual protections is taking on significant, uncompensated risk. The buyer controls the business after closing and therefore has enormous ability to influence whether earnout targets are achieved. Sellers must negotiate specific protections to prevent this control from being used to their detriment:

• ✅ Operating covenant: Require the buyer to operate the business in the ordinary course during the earnout period — maintaining investment levels, not eliminating the business unit, and not making changes that would materially affect the revenue or cost structure relevant to the earnout calculation
• ✅ Specific definitions: Define every metric in the earnout with accounting-level precision — which revenues are included, which expenses are allocated, which entities are consolidated. Ambiguity in earnout definitions is the most common precursor to disputes
• ✅ Audit rights: The seller should have the right to review the financial records relevant to the earnout calculation, with access to the business's books and the ability to engage an independent accountant to verify the buyer's calculation
• ✅ Anti-sandbagging provisions: Restrict the buyer's ability to take actions that would artificially depress the earnout metric — such as accelerating expenses into the earnout period, deferring revenue recognition, or making uneconomic pricing decisions that reduce top-line performance
• ✅ Change of control provision: If the buyer sells the business during the earnout period, the remaining earnout should be accelerated and paid in full or the acquirer should be required to assume the earnout obligation

When Should Sellers Accept an Earnout?

Earnouts make genuine sense for sellers in specific circumstances: when the business is in a genuine growth phase that the historical financials do not yet fully capture, when the seller believes the forward performance projections are achievable and wants to participate in the upside, when the seller will remain involved in the business post-closing in a capacity that gives them meaningful ability to influence performance, and when the earnout represents a relatively small percentage of total consideration rather than a dominant share of the purchase price. Begin your confidential exit consultation to discuss whether an earnout structure makes sense for your specific business, or contact our advisory team to get a professional assessment of earnout proposal terms before you sign.

Sellers should approach earnout proposals with caution when the earnout represents a large percentage of total consideration, when they plan to have minimal post-closing involvement in the business, when the earnout metrics are EBITDA-based without adequate operating covenants, or when the buyer has a track record of earnout disputes with prior sellers. In these circumstances, negotiating for a higher base price with no earnout — or a minimal, clearly defined earnout with strong contractual protections — is generally the better outcome.

❓ Frequently Asked Questions

What percentage of total consideration is typically structured as an earnout?

Earnouts typically represent 10–30% of total transaction consideration in lower middle market deals. Earnouts representing more than 30–35% of total consideration are generally considered aggressive and seller-unfavorable, as they place too much purchase price at risk from post-closing buyer decisions. Sellers should be skeptical of proposals where the earnout represents the majority of their expected total consideration.

How long do earnout periods typically run?

The most common earnout periods in lower middle market transactions are 12–36 months. Shorter periods (12 months) provide faster certainty but may not capture enough of the business's development cycle to be meaningful. Longer periods (36+ months) introduce more uncertainty and more opportunity for disputes. A 24-month earnout period is often a reasonable compromise that gives the business enough time to demonstrate performance while limiting the seller's post-closing uncertainty.

What happens if the earnout target is missed by a small amount?

Earnout payments are typically binary (target met = full payment; target missed = no payment) or tiered (payment scales with performance relative to the target). Binary earnouts create adversarial dynamics around performance near the threshold — a few thousand dollars of revenue difference can determine whether the seller receives or misses a payment worth hundreds of thousands of dollars. Tiered earnout structures — where payments scale proportionally with performance — are generally fairer and produce fewer disputes near the threshold.

Final Thoughts

Earnouts can be excellent tools for bridging valuation gaps in growing businesses — or traps for unprepared sellers who accept them without understanding the risks and dynamics of post-closing business control. The key is entering any earnout negotiation with a clear understanding of the risks involved, strong professional advisory support in drafting the specific earnout provisions, and a realistic assessment of whether the post-closing dynamics give you a genuine ability to influence the performance metrics on which your additional consideration depends. Approach earnouts with sophistication and appropriate skepticism — and ensure that any earnout you accept is structured with the protections that make it a genuine opportunity rather than an illusory promise.