How does an earnout work when buying a small business?

Use an earnout for a measurable uncertainty

Begin with one sentence: “The buyer will pay additional value if ____ proves true by ____.” If the blank cannot be stated without “overall performance” or “the business does well,” the mechanism is not ready.

Good candidates are bounded and observable: a named customer renews; a defined customer cohort produces specified collected revenue; a pending license is issued; a new contract begins and generates agreed gross profit; or normalized EBITDA reaches a threshold using a detailed accounting schedule. The earnout should address the same uncertainty that caused the fixed-price gap.

Do not use an earnout to avoid completing the earnings proof, define working capital, or negotiate the current purchase price. Unknown historical facts belong in diligence, representations, indemnities, escrows, or price—not automatically in future performance.

If the deal is SBA-financed, a seller earnout is prohibited

The asymmetry follows the credit logic rather than any view about fairness. An earnout adds a contingent obligation to a borrower the SBA has just underwritten and guaranteed; a rebate reduces one. So on a 7(a)-financed acquisition the contingent-consideration idea survives only if you invert it.

Structure	Direction of the money	SBA change-of-ownership treatment
Seller earnout	Buyer pays seller more if the business performs	Prohibited
Buyer rebate	Seller returns money to buyer if the business underperforms	Permitted — but proceeds must be applied to pay down the principal balance of the 7(a) loan that funded the change of ownership

That last condition is easy to miss and changes the economics. A rebate is not cash in the buyer’s pocket; it deleverages the business. The SOP notes that under 13 CFR § 120.223, applying seller rebate payments to principal does not trigger a subsidy recoupment fee — so the buyer is not penalised for the prepayment, but neither do they get to spend it.

Two practical consequences. First, if you want performance-contingent pricing on an SBA deal, negotiate the price at the optimistic case and build a downward rebate, rather than the pessimistic case with an upward earnout. Second, an escrow or holdback tied to specific identified risks — a disputed tax exposure, a customer consent, a lease assignment — is a different instrument from an earnout tied to future performance, and is generally the cleaner route to the same protection. The rest of this guide covers structures that work in both financed and unfinanced deals; if yours is SBA-financed, read it with the inversion above in mind, and confirm the position with your lender before the LOI. See the equity injection guide for the other change-of-ownership rules that constrain deal structure.

Define nine parts before negotiating the headline amount

Part	Question the agreement must answer
Metric	Revenue, collected revenue, gross profit, EBITDA, units, customers, or event?
Population	Which entity, location, products, customers, and period count?
Accounting	Recognition policy, reserves, credits, allocations, owner pay, related parties, and consistency?
Threshold and formula	Cliff, straight-line, tiered, percentage, cap, floor, and catch-up?
Measurement date	Monthly, annual, milestone date, and post-period adjustments?
Operations	What control stays with the buyer, and what conduct is prohibited?
Information	Reports, source records, access, review period, and confidentiality?
Dispute process	Notice, objection, independent accountant, authority, fees, and finality?
Payment	Timing, interest, withholding, setoff, lender restrictions, security, and acceleration?

Choose the metric from the failure mode

Revenue is visible but can reward discounting, extended credit, low-margin work, or channel stuffing. “Collected revenue” adds cash proof but can shift results across the period through billing and collection timing. Gross profit captures pricing and direct cost, but the agreement must define direct cost, labor burden, freight, returns, and inventory. EBITDA includes more economics but creates more disputes over allocation, owner compensation, integration, extraordinary items, and accounting policy.

A customer-specific earnout may fit concentration risk better than company-wide EBITDA. A regulatory event may need a fixed milestone payment. Select the narrowest reliable metric that answers the original question.

Illustrative tiered gross-profit earnout

Assume the seller seeks $1.4 million and the buyer supports $1.1 million of fixed value because a new contract has not yet demonstrated margin. The parties place up to $300,000 in an earnout based on collected gross profit from that named contract during the first 12 full months after closing.

• Below $300,000 of collected gross profit: no payout.
• From $300,000 through $500,000: payout equals 75% of gross profit above $300,000.
• Above $500,000: the first tier pays $150,000, plus 50% of gross profit above $500,000.
• Total payout is capped at $300,000.

If measured gross profit is $440,000, payout is 75% × $140,000 = $105,000. At $650,000, payout is $150,000 + 50% × $150,000 = $225,000. At $900,000, the formula reaches $350,000 but the cap limits payment to $300,000.

The math is the easy part. The agreement must define invoices and cash receipts, credits after the period, contract modifications, direct labor and burden, materials, freight, rework, refunds, bad debt, allocation of shared employees, and what happens if the customer buys through a related entity.

Balance buyer control and seller protection

The buyer must operate the acquired business, allocate capital, hire and fire, set pricing, manage risk, and respond to markets. The seller reasonably fears the buyer can suppress the metric by diverting customers, charging new costs, delaying invoices, or underinvesting.

A workable agreement usually preserves ordinary buyer control while prohibiting actions taken primarily to avoid the earnout, requiring consistent accounting, defining treatment of diverted business and acquisitions, and addressing sale or shutdown. Avoid a vague duty to maximize the earnout; it can conflict with the buyer's responsibility to the business.

If the seller remains involved, document:

• Role
• Authority
• Compensation
• Schedule
• Access
• Termination
• Customer communications
• Conflict resolution separately

An earnout does not make an undefined transition arrangement functional.

Design the calculation packet before closing

Attach a sample calculation using historical data. Specify the exact ledger accounts and reports, a monthly visibility package if needed, the final statement deadline, seller review period, permitted questions, source-record access, objection detail, negotiation window, and expert process. Decide whether the independent accountant resolves only disputed calculations or can interpret contract language.

Test the packet by having someone outside the negotiation reproduce the payout. If they cannot, the future parties will not either.

Model the maximum payout as a real obligation

An earnout can reduce fixed cash at close, but a successful business may owe the maximum when it also needs growth working capital, equipment, taxes, and debt service. Include the payout in a liquidity forecast. Ask the senior lender whether payment is permitted, subordinated, blocked after default, or included in leverage or debt definitions.

Compare it with a fixed seller note, escrow, holdback, or lower price. Each instrument solves a different problem: credit, recourse, unknown liability, or contingent value.

Contingent price has tax and allocation consequences

IRS Publication 537 describes a contingent-payment sale as one where the total selling price cannot be determined by the end of the sale year and provides special installment-sale rules ^[2] . A whole-business sale is allocated among separate assets; inventory is not eligible for installment reporting in the same way, and interest or original-issue-discount rules may apply ^[2] .

Buyer and seller tax consequences can differ depending on structure, allocation, payment character, employment/consulting arrangements, and timing. Obtain tax advice before finalizing the formula; do not let a business term acquire an unintended tax label after closing.

Earnout points that belong in the LOI

The LOI should state the business purpose, maximum amount, metric, measurement period, basic formula, buyer-control principle, reporting, lender contingency, and tax/adviser review. Leave drafting detail to the definitive documents but do not sign an LOI that says only “$300,000 earnout based on performance.”

A good earnout does not make both sides certain. It makes the remaining uncertainty measurable, allocates control honestly, and tells an independent reader exactly how a dollar becomes payable.