What Is an Earnout? Deferred M&A Payments Explained

An earnout is a deal structure in a merger or acquisition where part of the purchase price isn’t paid upfront — it’s paid later, contingent on the acquired company hitting agreed-upon performance targets, typically revenue, profit, or user growth measured over one to three years after the deal closes. Instead of the buyer paying one lump sum at close, the price splits into a guaranteed upfront portion and a variable future portion that depends on how the business actually performs once it’s owned by someone else.

Why buyers and sellers reach for one

An earnout exists to bridge a valuation gap. If a buyer and seller can’t agree on what a company is worth — often because the seller is projecting fast growth the buyer isn’t willing to pay for upfront, or because the buyer is uncertain the business will retain its customers or key employees post-acquisition — an earnout lets both sides get what they want conditionally. The seller can point to the higher headline price that includes the earnout; the buyer only pays that higher price if the growth the seller promised actually materializes.

It’s especially common in acquisitions of smaller or early-stage companies, where public financial history is thin and a DCF valuation or comparable-company analysis leaves a wide range of defensible prices. A well-structured earnout narrows the risk each side is taking on: the seller shares in the upside they’re promising, and the buyer isn’t fully exposed if that upside doesn’t show up.

How the structure typically works

A basic earnout has three components:

• Upfront payment — cash, stock, or a mix, paid at closing, unconditional.
• Contingent payment(s) — additional cash or stock paid out over a defined earnout period if specific metrics are met, often measured annually.
• Metrics and thresholds — the specific numbers being tracked (revenue, EBITDA, gross bookings, retained customer count) and the payout schedule tied to hitting, exceeding, or missing them.

A simplified example: a buyer acquires a startup for $50 million upfront, plus up to $20 million more if the acquired business hits $30 million in revenue within two years, scaled linearly below that threshold. If the business hits exactly $30 million, the seller collects the full $70 million. If it falls short, the seller gets a prorated fraction of the $20 million; if it clears the target, the earnout is usually capped rather than paid out uncapped.

What tends to go wrong

Earnouts generate more post-deal disputes than almost any other M&A mechanism, for a structural reason: once the deal closes, the buyer controls the business, and the seller’s payout depends on decisions the seller no longer makes. A buyer can — intentionally or not — change pricing, cut a marketing budget, reassign a sales team, or integrate the acquired product into a larger platform in ways that depress the exact metrics the earnout is measured against.

Well-drafted earnout agreements try to address this with operating covenants — contractual commitments about how the buyer will run the business during the earnout period, how disputes over the metrics get resolved, and sometimes an outside auditor to certify the numbers. Even with those protections, earnout disputes are common enough that they’re a frequent source of post-acquisition litigation, and many M&A advisors treat a large, long-dated earnout as a sign the parties never actually agreed on price — they just deferred the disagreement.

Earnouts vs. other deferred consideration

Earnouts are sometimes confused with related but distinct deal mechanics:

	Earnout	Escrow holdback	Vesting
Purpose	Bridge a valuation gap tied to future performance	Protect the buyer against breach-of-contract claims	Retain key employees post-acquisition
Paid when	Metrics are met over the earnout period	No claims arise during the escrow period	Employee stays employed over the vesting period
Typical size	Can be a large fraction of total price	Usually 10-15% of deal value	Set per employment agreement, separate from deal price

An earnout is about the business’s performance; a retention package with vesting is about whether specific people stay. The two are often combined in the same deal — a startup founder might have earnout payments tied to company metrics and separately vesting equity tied to their own continued employment — but they’re solving different problems.

Where this fits in the deal lifecycle

Earnout terms are negotiated as part of the broader acquisition agreement, alongside things like the term sheet structure and any liquidation preference stack that determines how the upfront proceeds get split among a startup’s investors and founders. For companies that raised money through instruments like a SAFE or convertible note, the earnout portion typically gets allocated the same way the upfront payment does — but only once it’s actually earned, which is exactly the timing mismatch that makes earnouts contentious when a company’s cap table has multiple stakeholders with different risk tolerances for waiting on a contingent payment. For general background on how these deal terms get negotiated in the first place, see how startup funding rounds work.

The takeaway

An earnout defers part of an acquisition’s price to a future date, contingent on the acquired business hitting agreed performance targets — a way to bridge a valuation disagreement without either side capitulating on price. It shifts risk onto the seller, who only collects the full amount if the business performs, and it works best when the metrics are clearly defined, independently verifiable, and paired with covenants that stop the buyer’s own decisions from quietly sinking the number the payout depends on.