Quick Answer
An earnout makes part of the purchase price conditional on the business hitting agreed targets after closing. It bridges a valuation gap when the buyer and seller disagree about future performance, and it is the single most litigated provision in owner-operated business sales.
An earnout is a disagreement about value, postponed. Whether it resolves or explodes depends entirely on the drafting.
When a buyer and a seller cannot agree what a business is worth, an earnout offers a way forward: pay some now, pay the rest if the business performs. It is genuinely useful and routinely misused. The provision converts a valuation argument into a measurement argument, and measurement arguments are only as clean as the definitions behind them. Structuring earnout milestones well is what separates the two outcomes.
We handle these matters for growth-stage companies in Idaho and California. This is general information — not legal or tax advice on a specific situation.
A bridge with no engineering
Parties agree an earnout in principle, then discover after closing that they defined the metric differently.
Define the metric, the control, and the remedy
Name the accounting basis, say who runs the business during the period, and set how disputes get resolved.
A payment that arrives or doesn’t, for reasons both sides predicted
No litigation, because the answer was calculable from day one.
Earnouts fail on definitions, not on performance.
Why earnouts exist
A seller who has just delivered a record year prices the business on that year. A buyer looking at the same numbers sees an outlier. Both positions can be held in good faith, and neither party can prove the other wrong in advance.
The earnout resolves this by deferring part of the price and conditioning it on results. The seller keeps the upside if the performance was real. The buyer avoids paying for performance that does not repeat. Where the gap is genuinely about the future rather than about negotiating posture, it is often the only structure that closes the deal.
The earnout does not settle the argument. It defers it to a date when facts exist.
Structuring earnout milestones
The metric matters more than the amount. Revenue is simple to measure and easy for a buyer to influence through pricing or channel decisions. Earnings-based metrics track value more faithfully but depend on cost allocations the buyer controls after closing. Non-financial milestones — a contract renewal, a regulatory approval, a customer retained — are often cleaner than either, because they are binary and observable.
Measuring earnout performance requires the accounting basis to be fixed in the agreement. State which standards apply, which costs may be allocated to the business, whether corporate overhead can be charged, and how acquisitions or disposals during the period are treated.
Binary and observable beats sophisticated and arguable.
Earnout period length and control
Earnout period length is a trade-off. Short periods reduce the chance the business changes beyond recognition but may not capture the performance in dispute. Long periods capture more but expose the seller to a business increasingly shaped by decisions they do not make. One to three years covers most owner-operated transactions.
Control is the harder question. After closing the buyer owns the business and will run it for its own purposes, which may not maximize the earnout. Sellers commonly negotiate operating covenants — maintaining the sales force, not reallocating the customer base, running the acquired business as a separate unit for measurement. Buyers resist because these constrain integration.
The seller carries the risk of decisions the buyer makes.
Earnout dispute prevention
Most earnout litigation is about interpretation rather than bad faith. Earnout dispute prevention starts with worked examples: attach a schedule calculating the earnout against hypothetical results so both sides can see the mechanism operate before they sign.
Where the buyer is financing part of the price, the SBA’s guidance on buying a business is worth reading alongside the earnout, since lender terms often constrain how contingent payments can be structured. Add reporting obligations so the seller sees performance during the period rather than at the end, an independent accountant as the first-line dispute resolver, and an earnout vs seller note comparison before committing — a seller note carries credit risk but no measurement risk, and for many sellers that trade is the better one. The SEC’s small business resources are a useful primer on the disclosure discipline these arrangements demand.
Attach the worked example. It is the cheapest clause in the agreement.
The underlying rules on this are published directly by Internal Revenue Service, and both are worth reading before you rely on a summary of them — including this one.
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