Acquirers manipulate earnout metrics because every dollar of earnout avoided is additional purchase price captured at no incremental cost. The structural incentive is clear: the party running the business also controls the measured metrics that determine payment to the sellers who no longer run it.
The economic incentive to reduce earnout payments is significant and predictable. When a buyer pays $50 million at closing with $20 million of additional consideration tied to a two-year revenue earnout, every dollar of revenue that does not appear in the earnout calculation is a dollar the buyer keeps. If the buyer can reduce measured revenue by $10 million through integration decisions — directing new customers to a different product, changing how contract revenue is recognized, charging corporate allocations that reduce net revenue — the buyer has effectively purchased the business for $10 million less than the stated price. This incentive is understood by the corporate finance teams of sophisticated acquirers, and there is ample evidence in M&A litigation that it influences integration planning decisions at some acquirers. The structural problem is not individual bad actors — it is that the party responsible for maximizing the earnout payment is also the party who benefits from minimizing it. Sellers who enter earnout arrangements without explicit contractual protections for their earnout metrics are relying on the buyer's good faith in a context where good faith is economically costly.
Most purchase agreements include some version of an obligation to operate in a manner designed to achieve the earnout, using commercially reasonable efforts or good faith language. The scope varies significantly — vague obligations are easier for buyers to escape than specific operational commitments tied to defined restrictions.
The purchase agreement is the starting point for any earnout dispute, and the quality of the earnout provisions varies enormously based on how carefully they were negotiated. The most important provisions are: the metric definition (which specifies exactly what is being measured and how), the buyer's operating obligations during the earnout period (which specify what the buyer must and must not do), the accounting methodology (which locks in the rules for calculating the metric), and the audit rights (which give the seller access to verify the calculation). On operating obligations, purchase agreements range from the minimal — a generic "commercially reasonable efforts" obligation with no specifics — to the detailed, which might include prohibitions on specific conduct: no accounting policy changes without seller consent, no intercompany expense allocations to the earnout P&L, no diversion of customer opportunities away from the acquired business unit, maintenance of the business as a separate reporting unit for earnout purposes. Sellers in earnout disputes should read their purchase agreement literally and map each element of the buyer's post-closing conduct against each obligation. The claim lives in the gap between what the buyer agreed to do and what they actually did.
Proving earnout manipulation requires documenting the specific decisions the buyer made that reduced the measured metric, the timing of those decisions, the financial impact, and evidence they were not made for legitimate business reasons. Internal buyer communications, board presentations, and integration planning documents are the most valuable evidence.
Evidence in earnout disputes falls into four categories. Financial evidence: the actual financial statements for the acquired business during the earnout period, with identification of specific line items where allocations, accounting changes, or other buyer decisions reduced the measured metric. Decision evidence: documentation of specific post-closing decisions — customer redirections, accounting policy changes, expense allocations — including the stated rationale and the financial impact on the earnout calculation. Temporal evidence: documentation that negative decisions were made during, not before, the earnout period, and that they were implemented in ways that disproportionately affected earnout-period results. Comparative evidence: documentation that the same accounting treatment or operational decisions were not applied to comparable business units of the acquirer, suggesting the purpose was earnout reduction rather than consistent management. The most difficult evidence to obtain in the pre-litigation stage is internal buyer communications — emails, presentations, and planning documents that discuss the earnout alongside operational decisions. These documents may reveal that the manipulation was deliberate, which significantly strengthens the seller's implied covenant claim and may support an argument for damages beyond the contractual earnout amount. They are typically obtained through discovery in litigation or through subpoena, which is one reason that early engagement of M&A litigation counsel is important in complex earnout disputes.
The implied covenant of good faith protects earnout recipients from buyer conduct that destroys the reasonable expectations formed at signing — even when the conduct is not explicitly prohibited. It fills contractual gaps but cannot override explicit contractual provisions that give the buyer discretion over operational decisions.
Delaware's implied covenant of good faith and fair dealing has been applied extensively in earnout disputes, and the case law reveals both its power and its limits. The covenant protects sellers from buyer conduct that, while not expressly prohibited by the purchase agreement, defeats the reasonable expectations that motivated the earnout arrangement. Courts have found implied covenant violations where buyers charged extraordinary integration costs to the earnout P&L in the first weeks after closing; where buyers systematically redirected customers to alternative product lines with no business justification; and where buyers changed accounting policies in ways that had no purpose other than to reduce the earnout calculation. The critical limitation is the contractual discretion doctrine: when the purchase agreement expressly grants the buyer discretion over operational decisions — the right to integrate the business, the right to change accounting policies, the right to make management decisions — courts will not substitute their judgment for the buyer's through the implied covenant. The implied covenant fills gaps; it does not override express grants of discretion. This is why the specificity of the earnout provisions at the time of drafting determines the scope of the seller's post-closing legal protection. Sellers who negotiated explicit restrictions on buyer conduct have breach-of-contract claims with defined remedies. Sellers who relied on generic good-faith language have implied covenant arguments that are stronger in egregious cases and harder to prove in close ones.
Most purchase agreements provide for neutral accountant arbitration for calculation disputes, and court or contractual arbitration for claims about buyer conduct violations. The two tracks are distinct: accounting disputes go to the neutral accountant; claims about buyer misconduct or breach of operating obligations go to court.
The dual-track structure of earnout dispute resolution is frequently misunderstood by sellers who receive an earnout statement that is lower than expected. The neutral accountant arbitration process — which is standard in most acquisition agreements — resolves disputes about whether the earnout was correctly calculated under the agreed accounting methodology. The neutral accountant reviews the parties' positions, applies the accounting rules specified in the purchase agreement, and renders a binding determination on accounting issues. The process is relatively fast (typically 30–90 days from submission), less expensive than litigation, and binding on the calculation questions it addresses. What it cannot do is address claims about buyer conduct. If the seller's position is that the buyer properly calculated what was measured, but changed the underlying business in ways that should not have been permitted, that is not an accounting question — it is a legal question about breach of contract or implied covenant violation. Those claims go to court or to a commercial arbitration panel, depending on the dispute resolution provisions of the purchase agreement. Sellers who have both types of claims need to pursue both tracks, and the sequencing between the neutral accountant proceeding and the legal proceeding requires careful attention: a neutral accountant determination on the accounting issues can affect the framing and damages calculations in the subsequent legal proceeding.
Most earnout disputes settle because both sides face real costs and risks. Mediation before or alongside litigation is frequently productive. Litigation makes sense when the amount is large, evidence of misconduct is strong, and negotiation has failed.
The decision framework for earnout dispute resolution should be explicitly economic. Sellers should calculate: the maximum potential recovery if every legal claim succeeds; the probability-weighted expected recovery given litigation risk; the cost of litigation through judgment, including management time and distraction; the timeline to a final judgment or resolution; and the realistic settlement range. In transactions below $10–15 million of earnout dispute value, the economics of full litigation rarely favor the seller, and direct negotiation combined with the neutral accountant process usually produces a better risk-adjusted outcome. In larger disputes, particularly where there is evidence of systematic manipulation, litigation or the credible threat of it often produces significant settlement value because the buyer faces not only the liability for the earnout amount but potentially punitive damages in egregious implied covenant cases and the reputational cost of a public finding of earnout manipulation. Mediation is the frequently underused middle option: it forces both parties to present their positions to a neutral third party, often surfaces information about the buyer's internal rationale that is useful for legal strategy, and frequently produces settlements more quickly and cheaply than the alternative. Sellers who have credible evidence of manipulation should approach mediation with a detailed factual presentation — specific decisions, specific financial impact, specific contractual violations — rather than general complaints about the earnout calculation.
Prevention requires a precisely defined metric with specified accounting methodology, explicit restrictions on buyer conduct, robust audit rights, and a standalone measurement basis. A shorter earnout period, a floor payment, and prohibition on accounting policy changes without consent are the most protective individual provisions.
The five most protective earnout provisions, in rough order of importance, are: first, a metric definition with locked accounting methodology — the purchase agreement should specify not just the metric (revenue, EBITDA, gross profit) but the exact accounting method used to calculate it, the treatment of intercompany allocations, how customer contracts are attributed, and whether integration costs can be charged to the earnout P&L. Second, explicit operating restrictions — affirmative prohibitions on the specific conduct most likely to reduce the earnout: no accounting policy changes without seller consent, no customer redirections without seller consent, no material changes to the sales and marketing approach for the acquired business, no integration that eliminates the ability to measure the earnout metric on a standalone basis. Third, robust audit rights — the right to access all books, records, and financial data relevant to the earnout calculation, to interview relevant financial personnel, and to engage the seller's own accountants to verify the earnout statement. Fourth, a meaningful floor — a minimum earnout payment that is payable regardless of performance, which reduces the buyer's incentive to manipulate below that threshold and ensures the seller receives at least partial consideration for the earnout arrangement. Fifth, a short earnout period — twelve months of post-closing performance is significantly easier to protect than 36 months, because the buyer has less time to engineer results and the evidence of any manipulation is more proximate to the baseline at closing.
Gurpreet S. Bal is a corporate partner with 16 years advising on private equity, merger transactions, and public offerings for companies and investors at three of the world's top law firms. He has represented clients in hundreds of transactions with aggregate deal value exceeding $60 billion across AI, semiconductors, fintech, and emerging technology. For more information and to get in touch, visit gurpreetbal.com.