What it means
Earnouts exist because sellers are usually more optimistic about the future than buyers. Rather than argue over a forecast neither side can prove, the parties agree that the disputed portion of the price will be paid only if the forecast actually comes true.
The structure also keeps the seller engaged. When a founder is staying on for two years, tying a meaningful slice of their proceeds to performance is a strong incentive to protect customer relationships through the handover.
The mechanics vary widely. Some earnouts pay a fixed lump sum if a single threshold is cleared, others pay a percentage of everything above a threshold, and many use tiers with a cap on the total that can be earned.
The choice of metric is where most disputes begin. Revenue-based earnouts are simple to measure but tempt the seller to chase unprofitable sales, whereas profit-based earnouts are fairer in principle but expose the seller to cost decisions the buyer now controls.
Well-drafted agreements therefore include protective clauses. These typically commit the buyer to run the acquired business separately, to maintain certain spending levels, and not to reallocate revenue or overheads in ways that quietly reduce the payout.
In practice
Real-world examples
Example 1
A dental practice group buys a three-site chain for $2,400,000 upfront plus $600,000 payable if patient numbers hold above 9,000 for two years. The retiring owner stays part-time specifically to protect those relationships.
Example 2
A software business is acquired with 40% of the price structured as an earnout on annual recurring revenue. The founders push hard for a clause preventing the buyer from bundling their product into a cheaper suite, which would cut measured revenue without cutting real value.
Example 3
An engineering consultancy sells for $5,000,000 plus an earnout tied to gross profit. Twelve months later the buyer has moved shared services costs into the acquired entity, gross profit falls short, and the two sides end up in arbitration over the allocation.
Think of it
Buying a house with a clause that the seller gets an extra bonus payment if the garden landscaping stays pristine and green through the entire first summer.
Formula
Calculation
Earnout Payment = Earnout Rate x (Actual Metric - Threshold), subject to any cap
A marketing agency is acquired for $6,000,000 payable at completion, plus an earnout of 30% of year-one revenue above a $4,000,000 threshold, capped at $1,500,000.
In year one the agency records revenue of $8,000,000. Revenue above the threshold is $8,000,000 - $4,000,000 = $4,000,000. The earnout is $4,000,000 x 0.30 = $1,200,000, which is below the $1,500,000 cap and therefore paid in full. Total consideration to the sellers is $6,000,000 + $1,200,000 = $7,200,000. Had revenue reached $10,000,000, the calculated amount would have been $6,000,000 x 0.30 = $1,800,000, so the cap would bite and only $1,500,000 would be paid.Case study
Seen in the real world
Brightmoor Logistics is a fictional, illustrative regional freight broker that agreed to sell to a larger carrier. The parties were $2,000,000 apart on price, because the seller expected two large contracts to renew and the buyer would not pay for renewals that had not yet happened.
They settled on $8,000,000 at completion plus an earnout of 25% of gross profit above $3,200,000 across the following year, capped at $2,000,000. The agreement also required the buyer to keep Brightmoor as a separate reporting unit and to leave its sales commission scheme untouched for the earnout period.
Gross profit came in at $10,000,000, so the calculated earnout was ($10,000,000 - $3,200,000) x 0.25 = $1,700,000, paid in full because it fell under the cap. In this illustrative outcome both sides were satisfied: the seller captured most of the value it had argued for, and the buyer paid the extra amount only once the cash had genuinely arrived.
Watch out
Common mistakes
- Agreeing the earnout metric without agreeing exactly how it will be calculated. Terms such as gross profit and recurring revenue mean different things to different accountants, and the definition must be written into the contract.
- Sellers assuming they will keep enough control to hit the targets. Once the deal closes the buyer decides on pricing, staffing and systems, all of which can move the measured result.
- Treating the earnout as money already earned. It is contingent by design, and a meaningful share of earnouts pay out less than the seller expected, so personal financial plans should not depend on it.
Questions
People also ask
How long do earnout periods usually run?
Most run for one to three years, since anything longer makes it hard to attribute results to the acquired business rather than to the buyer's own actions.
Is an earnout taxed differently from the upfront payment?
Treatment varies by jurisdiction and by how the earnout is structured, so both sides should take specific tax advice before signing rather than after.
What protects a seller if the buyer mismanages the business?
Contractual covenants requiring separate accounts, minimum investment levels and no diversion of customers, plus an agreed dispute process such as independent expert determination.