Inside the Earnout Dispute: Who Controls the Post-Closing Math?

Why earnouts can turn a completed business sale into a new commercial dispute.

The closing dinner happened. The announcement went out. The founder handed over the keys and finally used the word “exit.”

Months later, the first earnout statement arrived.

The revenue was lower than the seller expected. New corporate charges had appeared. A major customer had been reassigned. Products were bundled differently. The buyer said the formula was applied exactly as written. The seller said the buyer had changed the business—and then changed the math.

That is how a celebrated sale can become a post-closing commercial dispute.

THE SHORT ANSWER An earnout is contingent purchase price, not a guaranteed bonus. The agreement must define the target, calculation, operating rules, information rights, objection process, and dispute forum. A disappointing result is not automatically a breach, but control or discretion may create litigation risk when it is exercised contrary to the agreement or, under applicable law, to defeat the bargain.

What Is an Earnout?

An earnout makes part of the purchase price payable only if the acquired business reaches specified post-closing results. It is often used when the buyer and seller disagree about value today but believe future performance can answer the question later.

A typical structure includes an upfront payment at closing and one or more later payments tied to a defined metric, such as:

Revenue during a stated measurement period.

EBITDA or another profit-based calculation.

Customer retention, recurring revenue, or units sold.

Regulatory approval, product launch, financing, or another milestone.

A blended formula using financial and operational targets.

The concept sounds simple. The drafting rarely is. Each metric creates a different set of incentives and possible disputes.

Why the Conflict Is Built Into the Structure

Before closing, the seller often controls the company and the buyer evaluates it. After closing, those positions reverse. The buyer typically controls operations, personnel, budgets, pricing, integration, and accounting. The seller may retain an economic interest in the result without retaining authority over how the business reaches it.

That separation between control and economic exposure creates the central earnout tension: the party calculating the future payment may also be making the decisions that affect whether the target is reached.

The agreement can reduce that tension by defining operating covenants, calculation rules, and information rights. It cannot eliminate business risk. Markets change. Customers leave. Integration costs money. A buyer is not automatically liable because performance disappoints or because it runs the acquired company differently.

“Revenue” Is Not One Number

A revenue earnout may avoid some of the expense-allocation arguments found in EBITDA, but it still depends on definitions. The agreement may need to address returns, rebates, discounts, deferred revenue, bundled sales, intercompany transactions, acquired customers, currency conversion, channel changes, and when revenue is recognized.

A buyer may shift sales into another affiliate, combine products, discontinue a channel, or change billing practices for legitimate business reasons. The litigation question becomes whether the resulting calculation follows the contract and any operating promises—not whether the seller would have made different decisions.

EBITDA Creates More Places to Disagree

EBITDA-based earnouts move the dispute below the revenue line. Which expenses count? Can the buyer allocate corporate overhead? What happens to integration costs, new hires, management fees, restructuring charges, stock compensation, reserves, related-party expenses, or investments intended to produce growth after the earnout period?

A reference to GAAP may not answer every question. GAAP can permit judgment and alternative treatments, and the historical accounting practices of the target may differ from the buyer’s policies. Stronger drafting identifies the hierarchy: the express earnout definitions, a schedule of specific principles, consistent past practices, and then broader accounting standards where the agreement directs.

Milestones Can Fail Without Any Accounting Dispute

Not every earnout is financial. A milestone may depend on approval, launch, certification, a new contract, or a specified event. The dispute may center on who controlled the steps, whether efforts were required, whether the milestone was objectively achieved, and whether a deadline was extended or excused.

Phrases such as “commercially reasonable efforts,” “reasonable best efforts,” “sole discretion,” or “no obligation to maximize the earnout” can materially change the analysis. Their effect depends on the full agreement and governing law. A slogan about fairness cannot replace the negotiated language.

Can the Buyer Run the Business However It Wants?

The answer usually begins with the acquisition agreement. Some agreements require operation in the ordinary course, restrict specified actions, preserve a business line, or require efforts directed toward the earnout. Others expressly allow integration, restructuring, pricing changes, or decisions made in the buyer’s own interest, and disclaim any duty to maximize the payment.

The implied covenant of good faith and fair dealing can matter, but it is not a repair kit for every missing protection. Florida recognizes an implied covenant tied to the performance of express contract terms; it generally cannot contradict the agreement or create a free-standing duty the parties did not negotiate.

New York’s Court of Appeals addressed contractual discretion in 2026 in 111 W. 57th Investment LLC v. 111 W57 Mezz Investor LLC. The court held at the pleading stage that “sole discretion” did not automatically eliminate a properly alleged implied-covenant claim when discretion was allegedly used to destroy the benefit of the bargain. The court also emphasized that the implied-covenant burden remains heavy and must be grounded in the contract viewed as a whole.

That decision was not an earnout case and does not guarantee a seller a claim. It does reinforce why the exact grant of discretion, the purpose of the agreement, and the alleged conduct must be analyzed together.

The Earnout Statement Is Only the Beginning

A well-drafted agreement usually requires the buyer to deliver a calculation statement and supporting information. The seller may have a short period to object, identify disputed items, and provide reasons. Unresolved accounting issues may then go to an independent accountant, while legal or bad-faith disputes may go to court or arbitration.

The procedure can be outcome-determinative. Missing an objection deadline, failing to state an issue with enough specificity, sending notice to the wrong address, or submitting a legal dispute to an accountant with limited authority can create a second fight before the merits are ever reached.

Information Rights Decide Whether the Math Can Be Tested

A seller cannot evaluate a calculation it cannot see. The agreement should address access to financial statements, general ledgers, workpapers, customer data, allocation schedules, personnel with relevant knowledge, and records held by affiliates.

The buyer may have legitimate confidentiality, privilege, cybersecurity, or burden concerns. Those interests can be balanced through defined access, confidentiality protections, expert-only review, scope limits, and a process for disputed requests.

When litigation is possible, preserve the original calculation model, drafts, assumptions, board materials, integration plans, accounting policies, customer transfers, internal communications, and the data used to prepare each statement. A summary spreadsheet without source records may not answer how the result was produced.

Setoff Is Not the Same as an Earnout Calculation

A buyer may claim that the seller breached a representation, owes indemnity, or caused a separate loss. Whether the buyer can reduce the earnout by that amount depends on the agreement. The indemnity article, escrow terms, setoff rights, claim procedures, caps, baskets, survival periods, and earnout provision must be read together.

A buyer should not assume every asserted claim can be netted against the payment. A seller should not assume the earnout is insulated from contractual offsets. The document may authorize, limit, condition, or prohibit the deduction.

Governing Law and Forum Are Part of the Economics

Acquisition agreements often select a governing law, court, arbitration forum, or accounting-expert process that differs from where the company operates. That choice can affect contract interpretation, implied-covenant arguments, discovery, available remedies, cost, and timing.

Florida Statutes section 685.101 and New York General Obligations Law section 5-1401 each provide frameworks for selecting their law in certain substantial commercial transactions. Related forum provisions have their own requirements. The thresholds and statutory details do not replace a full choice-of-law analysis, but they show why the governing-law clause is not boilerplate.

What to Preserve When the Number Looks Wrong

The signed acquisition agreement, disclosure schedules, amendments, side letters, and closing statement.

The earnout model, target definitions, illustrative calculations, forecasts, and negotiation drafts.

Historical accounting policies and the target’s pre-closing financial statements.

Each buyer calculation, workpaper, data export, allocation schedule, and objection notice.

Records of pricing, customer transfers, staffing, product changes, integration, and related-party charges.

Board materials, management presentations, and communications discussing the earnout or post-closing strategy.

Proof of delivery for notices and a calendar of every objection, access, arbitration, and limitations deadline.

A Better Earnout Dispute Strategy

Map the formula before accusing anyone of manipulation. Identify each defined term, input, hierarchy, and permitted adjustment.

Separate accounting disagreements from legal disputes, operational-covenant claims, indemnity issues, and access disputes.

Preserve the source data and calculation trail before systems, personnel, or policies change again.

Comply precisely with notice and objection procedures while reserving rights that the agreement permits.

Use accounting, valuation, industry, and damages professionals only after defining the question each expert must answer.

Evaluate the likely recovery, remaining earnout periods, business relationship, confidentiality, and cost before choosing negotiation, expert determination, arbitration, or litigation.

Frequently Asked Questions

Is an earnout guaranteed after a business sale?

No. An earnout is typically contingent purchase price payable only if the contract’s specified financial or operational conditions are satisfied. The calculation, timing, caps, exclusions, and conditions depend on the agreement.

Can a buyer change how the acquired company operates?

Often yes, but the extent of that authority depends on the agreement. Operating covenants, efforts clauses, integration rights, discretion provisions, and any express disclaimer of a duty to maximize the earnout are important.

Does a zero earnout prove the buyer acted in bad faith?

No. A zero result may reflect actual performance, the agreed formula, changed conditions, or legitimate operations. A claim requires analysis of the contract, calculation, conduct, evidence, and governing law.

What is the difference between a revenue and EBITDA earnout?

Revenue focuses on top-line sales but still requires recognition and inclusion rules. EBITDA subtracts expenses and therefore often creates additional disputes over allocations, overhead, integration costs, reserves, and accounting policies.

Can GAAP decide an earnout dispute?

Sometimes it informs the calculation, but a general GAAP reference may not resolve every issue. The agreement may establish specific definitions, examples, consistency rules, or a hierarchy that controls before broader accounting standards apply.

Can the buyer subtract an indemnity claim from the earnout?

Only if the agreement permits or otherwise supports the setoff. Review the earnout, indemnity, escrow, setoff, notice, cap, basket, and survival provisions together.

Who decides an earnout dispute?

The agreement may assign accounting disputes to an independent accountant, legal disputes to a court or arbitrator, and other issues to a different process. The scope of each decision-maker’s authority can itself become disputed.

What happens if the seller misses the objection deadline?

The buyer may argue that the calculation became final and binding. Whether that argument succeeds depends on the language, governing law, notice, compliance, waiver, and other facts. Treat every contractual deadline as potentially consequential.

What records matter most in earnout litigation?

The agreement, calculation model, accounting policies, source data, workpapers, customer and product records, allocation schedules, operational decisions, internal communications, board materials, and timely objection notices often matter.

Final Word

An earnout postpones part of the price. It also postpones part of the valuation disagreement.

The strongest agreements do more than state a target. They define the metric, allocate control, constrain or preserve discretion, provide access to records, separate accounting from legal disputes, and create a workable path for objections. When the number arrives, the strongest litigation strategy begins with the formula and the evidence—not the accusation.

MB Law Group represents businesses, owners, investors, and individuals in Florida and New York in commercial litigation, contract disputes, and high-stakes business conflicts. If an earnout or post-closing payment has become disputed, contact MB Law Group to discuss the agreement, record, and available options.

Attorney Advertising. This article is for informational purposes only and is not legal advice. It does not create an attorney-client relationship. Laws and their application depend on specific facts. Prior results do not guarantee a similar outcome.