An earn-out is a deal structure where part of the purchase price is paid later, only if the business hits agreed targets after the sale. A typical example: the buyer pays $200,000 at closing and another $100,000 over two years if revenue stays above a set level. Earn-outs exist for one reason — the seller and the buyer disagree about what the business is worth, and neither side will move. Instead of walking away, they let future performance settle the argument.

Earn-outs are most useful in three situations. First, when revenue is growing fast but unproven, so the buyer will not pay for growth that has not happened yet. Second, when the business depends heavily on the seller's personal brand or relationships, and the buyer wants the seller motivated to hand those over properly. Third, when the buyer is stretching financially and needs to spread the price over time. In all three cases the earn-out turns a disagreement about value into a shared bet on the future.

The structure matters more than the headline number. Define the target precisely: revenue, profit, or a specific metric like subscriber count, measured over a clear period, usually 12 to 24 months. Decide who controls the business during the earn-out — if the buyer slashes marketing spend to cut costs, revenue may fall and the seller loses through no fault of their own. Good agreements protect the seller with covenants on how the business is run, and protect the buyer with caps and clear definitions of what counts toward the target.

Earn-outs fail more often than they succeed, and the reasons are predictable. Targets are set on metrics the buyer can manipulate, disputes erupt over accounting, or the seller loses motivation once the business is no longer theirs. The best defence is simplicity: one or two metrics, measured from data both sides can see, with a written process for resolving disputes before they reach lawyers. Avoid earn-outs that depend on the buyer's overall company performance rather than the acquired business alone.

Use an earn-out when it solves a real valuation gap and both sides genuinely want the deal. Do not use one to paper over a bad deal — if you would not buy the business at the upfront price alone, an earn-out will not fix it. And sellers should remember that earn-out money is never guaranteed: price it in your head at a discount, because a dollar promised in two years is worth far less than a dollar paid at closing.

A well-negotiated earn-out protects both sides, and the details decide whether it works. Sellers should ask for a floor — a minimum payment regardless of performance — and for acceleration, so the full earn-out pays out immediately if the buyer sells the business during the earn-out period. Buyers should ask for a cap, so the earn-out cannot exceed a fixed amount, and for the right to offset the earn-out against any breaches of the seller's warranties. Both sides should agree on how the target is measured: which accounting system, which revenue definition, and who audits the numbers. Put a dispute process in writing — mediation first, then arbitration — because earn-out disputes that reach court cost more than the earn-out is worth. And get tax advice: in many jurisdictions the earn-out is taxed differently from the upfront price, and the structure can be worth thousands either way. An earn-out agreed in a hurry is worse than no deal at all, so take the time to write the metrics, the measurement, and the dispute process down properly.