A buyer and seller agree on almost everything except the price. The seller believes the business is worth more based on where it's headed; the buyer isn't willing to pay for growth that hasn't happened yet. An earnout is one of the most common ways deals bridge that gap, structuring part of the purchase price as a contingent payment tied to the business hitting specific targets after closing.
It's a useful tool, and it's also one of the more complicated pieces of a sale agreement to get right, since it ties a real portion of what a seller ultimately receives to performance during a period when the seller often no longer fully controls the business. Understanding the moving parts before signing is worth the time, regardless of which side of the negotiation you're on.
What an earnout actually structures
At its core, an earnout splits the total consideration into an upfront payment at closing and one or more contingent payments made later, conditioned on the business meeting agreed targets over a defined period, commonly one to three years. The contingent portion can be structured as an all-or-nothing threshold, a sliding scale tied to how far above or below target the business performs, or a series of smaller milestones paid out over time.
The specific structure chosen affects how much risk actually transfers to the seller. A single all-or-nothing threshold two years out concentrates the risk into one measurement date, while a series of smaller annual milestones spreads it across multiple checkpoints, which some sellers find easier to plan around even when the total contingent amount is similar.
Why buyers propose earnouts in the first place
Earnouts typically show up when there's a genuine, good-faith gap between what a seller believes the business is worth, often based on recent growth or a pending contract, and what a buyer is willing to underwrite with certainty at closing. Rather than walking away from the deal entirely, an earnout lets both sides agree to disagree about the future and let actual results settle the difference.
This is a topic worth raising directly with your investment banker or business broker: whether the earnout is being proposed because of a genuine valuation disagreement, or because the buyer is using it to shift financing risk onto the seller in a way that isn't really about a valuation gap at all. Those are different situations that call for different negotiating positions.
Common metrics used to measure performance
Revenue-based earnouts are the most straightforward to measure and dispute the least, but they don't account for how the business is actually run, a buyer could grow revenue while eroding margins in ways that don't serve the seller's contingent payment. EBITDA-based earnouts more closely track profitability, but they open the door to disputes over how specific costs are allocated and categorized after the sale, especially once the business is integrated into a larger buyer's accounting systems.
Some deals use non-financial milestones instead, a product launch, a regulatory approval, a customer retention threshold, which can be clearer to measure in some respects but require careful definition to avoid ambiguity about what actually counts as achieving the milestone. The Small Business Administration publishes general background on structuring a business sale that's worth reviewing alongside deal-specific advice from your own advisory team.
Who controls the business during the earnout period
This is frequently the single most contentious point in earnout negotiations. If the buyer controls day-to-day operations during the measurement period, decisions the buyer makes, cutting a marketing budget, changing pricing, delaying a product launch, can directly affect whether the seller's earnout target gets hit, even if those decisions make sense for the buyer's broader business.
Sellers negotiating an earnout typically want specific operating covenants written into the agreement: minimum spending levels in key areas, restrictions on major strategic changes during the earnout period, or a defined role for the seller in ongoing operations. These provisions are worth reviewing carefully with legal counsel, since a well-drafted earnout clause without operating protections can leave a seller with contractual language that looks fair but offers little practical protection.
How the financial definitions get set (and disputed)
The specific accounting definitions used to calculate the earnout metric, whether it's revenue, EBITDA, or something else, need to be spelled out in detail in the purchase agreement, including how they handle one-time items, intercompany allocations, and changes in accounting method. Vague or incomplete definitions are one of the most common sources of post-closing disputes, since both sides can have a good-faith but different read on how a specific cost should be categorized. The AICPA publishes guidance on accounting for contingent consideration in business combinations that's a useful reference for understanding how these definitions get applied in practice.
Some agreements specify that the business will be run as a separate, standalone unit for measurement purposes, with its own set of books, specifically to avoid the ambiguity that comes from integrating it into a larger buyer's systems before the measurement period ends. Whether that's realistic depends heavily on the specific deal and buyer.
Tax treatment of earnout payments
Contingent payments in a business sale generally get tax treatment under the installment sale rules, meaning gain is typically recognized as payments are received rather than all at once at closing, though the specific treatment depends on how the deal is structured and whether an election out of installment treatment is made. Earnout payments can also carry an imputed interest component under IRS rules if the agreement doesn't state an adequate stated interest rate on the deferred amount.
The IRS publishes guidance on installment sale reporting and contingent payment sales, and this is exactly the kind of topic worth bringing to a tax advisor before signing, not after the first earnout payment arrives and the reporting question becomes urgent. The tax treatment can meaningfully affect the after-tax value of the contingent portion compared to an equivalent amount paid upfront.
Dispute resolution mechanisms worth reviewing
Because earnout calculations involve judgment calls about accounting treatment, most agreements include a dispute resolution process, often starting with an audit right allowing the seller to review the buyer's calculation and supporting records, followed by an escalation path to an independent accountant or arbitrator if the parties can't agree. Review this mechanism as carefully as the earnout metric itself, since a good calculation methodology paired with a weak or expensive dispute process still leaves a seller with limited practical recourse if a disagreement arises.
Coordinating with the same investment banker or business broker who helped structure the sale on this specific clause is worth doing, since they've typically seen how these disputes actually play out in practice across other deals. Investor.gov has general background on working with financial and deal professionals that's useful context for coordinating a team this size around a single transaction.
How earnouts interact with escrow and indemnification
An earnout is a separate mechanism from an escrow holdback for indemnification claims, but the two can interact in a deal, particularly if a buyer has the right to offset an earnout payment against an indemnification claim for a breach of representations and warranties. Understanding whether and how these two mechanisms can affect each other is worth clarifying explicitly in the agreement, since an earnout that's technically achieved on paper doesn't guarantee the actual payment if an offset right exists elsewhere in the contract.
Questions worth bringing to your advisory team
Before agreeing to an earnout structure, it's worth walking through a specific set of questions with your accountant, attorney, and deal advisor together: how is the metric defined and who controls the inputs, what operating protections exist during the measurement period, what's the dispute resolution process if the calculation is contested, and how will the contingent payments actually be taxed when received. These aren't questions with a single right answer, they depend heavily on the specific deal, industry, and buyer, which is exactly why they're worth reviewing with professionals who know the details of your situation rather than applying a generic template.
How an earnout affects post-sale planning more broadly
An earnout doesn't just affect the sale negotiation itself, it also shapes the seller's personal financial planning for a period of one to three years after closing, since a meaningful portion of expected proceeds remains uncertain and contingent rather than available for reinvestment or other planning immediately. Sellers sometimes underweight this in their own planning, treating the full headline sale price as available when only the upfront portion is actually certain.
This is worth reviewing with a financial advisor separately from the deal negotiation itself, since decisions like timing a move, funding a large purchase, or restructuring other investments can be affected by how much of the total sale proceeds are actually confirmed versus still contingent on a future measurement date.
The role of experienced deal counsel
Earnout provisions are dense, deal-specific, and full of terms that sound similar across agreements but can carry meaningfully different practical consequences depending on precise drafting. An attorney with specific experience negotiating earnout clauses, not just general M&A experience, is worth seeking out specifically for this piece of the agreement, since the difference between a well-drafted and poorly-drafted earnout clause often isn't visible until a dispute actually arises and the exact wording gets tested. Asking a prospective attorney directly how many earnout disputes they've actually handled, not just how many deals they've closed, is a reasonable question during the selection process.
If you're navigating a business sale and want to be matched with an advisor experienced in these structures, Capivise connects sellers with vetted professionals through our advisor match process. You can also review our questions to ask an advisor before your first meeting, so the conversation starts from an informed position rather than a blank slate.
