Acquirers manipulate earnout metrics because every dollar of earnout they avoid paying is a dollar of additional purchase price they capture at no incremental cost. The incentive is structural: the party responsible for running the business is also the party whose financial performance determines the payout to the people who no longer run it. Without explicit contractual protections, that conflict of interest predictably produces conduct designed to minimize the measured metrics.
The economics of earnout manipulation are straightforward, and in my experience they are well understood by the corporate finance and strategy teams of acquirers who use earnouts regularly. If a buyer agreed to pay $50 million upfront plus a $20 million earnout tied to revenue in years one and two, and they can reduce the measured revenue by $10 million through integration decisions that are technically within their discretion as the business owner, they have effectively purchased the business for $10 million less than the stated price. The mechanisms for doing this are well-established and fall into four main categories. Expense allocation is the first: charging corporate overhead, integration costs, shared services, or new headcount to the acquired business unit in ways that reduce profit metrics. Customer redirection is the second: routing new customers to other business units, steering renewals toward the acquirer's alternative products, or simply failing to pursue growth opportunities that would benefit the earnout metric. Accounting policy changes are the third: switching revenue recognition methods, changing how deferred revenue is treated, modifying how customer contracts are allocated across business units. Integration absorption is the fourth: merging the acquired business into a larger division in ways that make it mathematically impossible to isolate the metrics that drive the earnout. Understanding which of these tactics is being used — and when — is the first step in building a dispute.
Most purchase agreements include some version of an obligation for the buyer to operate the acquired business in a manner designed to achieve the earnout, often using "commercially reasonable efforts" or "good faith" language. The scope and enforceability of these obligations varies significantly based on how specifically they were negotiated — vague obligations are easier for buyers to escape than specific operational commitments.
The first thing I do in an earnout dispute is read the earnout provisions of the purchase agreement carefully, and I mean carefully — every sentence. The governing provisions typically address four things: the definition of the earnout metric itself (revenue, EBITDA, gross profit, customer counts, product milestones), the buyer's operating obligations during the earnout period, the accounting methodology that applies to the metric calculations, and the dispute resolution process. On buyer obligations, there is a wide spectrum of what purchase agreements say. The weakest provisions simply state that the buyer will operate the business "in good faith" or "in a commercially reasonable manner" — language that gives the seller something to argue but is difficult to enforce against specific decisions. Stronger provisions include affirmative commitments: the buyer will not change accounting policies without seller consent; the buyer will maintain the acquired business as a separate reporting unit; the buyer will not redirect specified customer accounts; the buyer will not charge integration costs to the earnout P&L. The strongest provisions include a standalone earnout-period operating plan that was agreed at closing and that the buyer is contractually obligated to follow. Sellers in earnout disputes should work through their purchase agreement section by section, mapping the specific actions the buyer has taken against the specific obligations the buyer agreed to. The gap between what the buyer agreed to do and what they actually did is where the legal claim lives.
Proving earnout manipulation requires documenting the specific decisions the buyer made that reduced the measured metric, the timing of those decisions relative to the earnout period, the financial impact of each decision on the earnout calculation, and evidence that those decisions were not made for legitimate business reasons. Internal buyer communications, board presentations, and integration planning documents are the most valuable evidence.
Evidence development in an earnout dispute is an exercise in building a timeline. I typically advise founder-sellers to start maintaining detailed records the moment they sense something is wrong — which in my experience is usually around month three to six post-closing. The evidence categories that matter most are these. Financial documentation: the actual financial statements for the acquired business under the new ownership, with specific line items identified where buyer allocations or accounting changes affected the earnout metric. Decision documentation: written records of specific decisions — the decision to redirect a customer, the decision to change a revenue recognition policy, the decision to charge a category of expense to the business unit — including the stated rationale and the financial impact. Timeline documentation: evidence that decisions with negative earnout impact were made during the earnout period rather than before or after, which sometimes matters for implied covenant claims. Comparative documentation: evidence that the same decisions were not applied to comparable business units of the acquirer, suggesting the purpose was to reduce the earnout rather than to run the business consistently. The most valuable evidence is often internal buyer communications — emails, board presentations, integration planning documents — that discuss the earnout explicitly alongside operational decisions. Those communications are not voluntarily produced; they come through discovery in litigation or demand letters, which is one of the reasons early legal engagement matters in these disputes.
The implied covenant of good faith and fair dealing in Delaware protects earnout recipients from buyer conduct that destroys the reasonable expectations the seller had when negotiating the deal — even when that conduct is not explicitly prohibited by the purchase agreement. It fills contractual gaps but does not override explicit contractual provisions that give the buyer discretion over operational decisions.
Delaware's implied covenant of good faith is a doctrine that has real but limited application to earnout disputes, and understanding its limits is important before advising sellers on their legal strategy. The covenant implies that parties to a contract will not act in ways that deprive the other party of the benefit of their bargain — even when the specific conduct is not expressly prohibited by the contract. In the earnout context, Delaware courts have held that a buyer who takes actions specifically intended to reduce earnout payments violates the implied covenant, even if those actions were technically within the buyer's operational discretion. The key limitation is that the implied covenant cannot override explicit contractual discretion: if the purchase agreement expressly gives the buyer the right to integrate the business, change accounting policies, or redirect customers, the implied covenant cannot substitute the court's judgment for the buyer's business judgment. This is why the specific language of the earnout provisions matters so much — and why sellers who want maximum protection need to negotiate explicit restrictions on buyer conduct rather than relying on the implied covenant as a backstop. In practice, the implied covenant serves as the seller's argument when the buyer's conduct was clearly designed to minimize the earnout but was not expressly prohibited: charging extraordinary integration costs to the earnout P&L immediately after closing, steering every new customer in the target's market to a different business unit, changing revenue recognition methods in the first month of the earnout period. Courts look at the totality of the buyer's conduct and ask whether it reflects a genuine business decision or an attempt to game the earnout calculation.
Most purchase agreements provide for a neutral accountant arbitration process to resolve disputes about the earnout calculation — similar to the post-closing working capital adjustment process. The neutral accountant reviews the parties' positions and renders a binding determination on accounting disputes. Legal claims about buyer conduct violations (implied covenant, breach of operating obligations) go to court or other dispute resolution mechanisms specified in the agreement.
The earnout dispute resolution process has two distinct tracks, and confusing them is a common and costly mistake. The first track is the accounting dispute track: when the parties disagree about how the earnout metric was calculated — whether a specific revenue item should be included, how a cost allocation was recorded, which accounting methodology applies — they submit the dispute to a neutral accountant (typically one of the large accounting firms or a specialized firm that provides this service). The neutral accountant reviews the parties' submissions and renders a binding determination on the accounting issues within their mandate. The limitation of this process is that it resolves calculation disputes, not conduct disputes. If the seller's claim is that the buyer properly calculated what was measured but changed the underlying business in ways that reduced what was measured, the neutral accountant cannot address that claim — it requires a court. The second track is the legal dispute track: claims that the buyer breached its operating obligations, violated the implied covenant of good faith, or interfered with the earnout through conduct that the purchase agreement prohibited are contract claims that go to court (or to arbitration if the agreement has an arbitration clause). Most complex earnout disputes have elements of both tracks, and coordinating the two proceedings requires careful strategic thinking about sequencing, evidence preservation, and the interaction between the neutral accountant's determination and the court proceedings.
Most earnout disputes settle, because both sides face real costs and risks in litigation — the buyer faces liability for intentional misconduct and potentially punitive damages in egregious cases, while the seller faces the cost and uncertainty of lengthy litigation. Mediation before or alongside litigation is frequently productive. Litigation makes sense when the amount is large, the evidence of misconduct is strong, and negotiation has failed.
I approach earnout dispute resolution by first calculating the economics clearly. What is the maximum theoretical earnout payment if the seller's position is entirely correct? What is the likely litigation cost and timeline? What is the probability of prevailing on each claim? What is the realistic settlement range? These numbers tell you whether litigation makes economic sense or whether settlement — even at a discount to your theoretical maximum — is the better outcome. In my experience, earnout disputes where the potential recovery is under $5 million rarely justify full litigation economics, and the neutral accountant process combined with direct negotiation typically produces a better outcome than going to court. Above that threshold, the calculus depends heavily on the quality of the evidence and the egregious-ness of the buyer's conduct. Buyers who changed accounting policies in the first month of the earnout period, who have internal emails discussing earnout reduction, or who redirected entire customer categories immediately after closing face significant litigation risk and usually have strong settlement incentives. Buyers who simply ran the business according to their own judgment and the seller's metrics happened to come in below target have a much stronger defense. Mediation is often the right intermediate step: it forces both sides to articulate their positions, surfaces information about the buyer's rationale that may inform the seller's legal strategy, and frequently produces settlements more quickly and cheaply than litigation.
Earnout manipulation prevention requires four elements: a precisely defined metric that is difficult to manipulate through accounting choices or operational decisions; explicit restrictions on buyer conduct that could reduce the metric; robust audit rights with access to the data underlying the calculation; and a measurement framework that accounts for integration decisions by netting them out or specifying a standalone basis for calculation.
If I could give sellers one piece of earnout advice that they almost never take during deal negotiations, it would be this: the time you spend negotiating the earnout definition and operating obligations is worth many times what you spend negotiating the headline price, because the earnout provisions determine whether you actually receive the number on the term sheet. The provisions that matter most are these. First, define the metric as specifically as possible, including the accounting methodology, the treatment of intercompany transactions, how expense allocations will be handled, and whether the calculation is on a standalone basis or a consolidated basis. Vague metrics are easy to manipulate; specific metrics with defined methodologies are much harder. Second, negotiate explicit operating restrictions: prohibitions on accounting policy changes without seller consent, restrictions on customer redirection, limits on expense allocations to the earnout P&L, and a requirement to maintain the business as a separate reporting unit. Third, negotiate strong audit rights: the right to access the books and records relevant to the earnout calculation, the right to interview relevant financial personnel, and a defined timeline for producing the earnout statement. Fourth, consider a collar or floor: a minimum earnout payment that is payable regardless of performance, which creates an economic floor below which manipulation doesn't help the buyer. Fifth, negotiate for a shorter earnout period — the shorter the period, the less time the buyer has to engineer results. A 12-month earnout based on the first year post-closing is easier to protect than a 36-month earnout based on cumulative performance.
In my experience, the sellers who do best in earnout disputes are the ones who started keeping records early — who documented every decision they noticed, every accounting change they were told about, every customer conversation that seemed off. The sellers who struggle are the ones who waited until the earnout statement arrived to start gathering evidence, at which point the institutional memory of specific decisions has faded, relevant personnel have moved on, and the buyer's version of events is the only documented one. If you are in an earnout period and something feels wrong, start documenting it now. You may not need those records. But if you do need them, you will need them badly.
Gurpreet S. Bal is a Partner at Foley and Lardner LLP in Silicon Valley, where he advises startups, founders, and investors on SAFE financings, venture capital rounds, mergers and acquisitions, acquihires, and IPOs. He has represented clients in hundreds of transactions with aggregate deal value exceeding $60 billion across AI, semiconductors, fintech, and emerging technology. Prior to his career as a corporate lawyer and transaction advisor, he served with the U.S. Department of Justice and as an international and cross-border tax advisor at a Big 4 accounting firm.