Earn-outs that don't poison the well

Earn-outs let an acquirer pay a lower upfront price and a higher contingent one, supposedly aligning incentives. In practice, they create incentives for both sides to game the metrics — and the relationship deteriorates over the earn-out period as each side optimizes for the contract, not the partnership.

What goes wrong

• Metrics that depend on the acquirer's actions — they slow them down to reduce payout.
• Founders optimize for the earn-out metric, not the company's actual health.
• Integration delays push key milestones outside the earn-out window.
• By year two, both sides regret the structure, and the founder leaves angry.

When earn-outs do work

When the metrics are entirely under the founders' control, the period is short (under 18 months), and both sides genuinely agree the earn-out reflects a real uncertainty — not a valuation gap being papered over.

An earn-out that solves a valuation argument creates a partnership argument that lasts years.