Earnouts in Acquisitions: How I Structure Them, Size Them, and Protect Them

An earnout is a portion of the acquisition price paid to the seller after close, contingent on the business hitting agreed performance targets over a defined period. It bridges a valuation gap between what the seller wants and what the buyer will fund on day one, shifts execution risk onto the person best able to influence the outcome, and turns a disputed number into a shared bet on future performance. Structured properly, an earnout de-risks the deal for the buyer, gets the seller paid for the upside they’re promising, and closes deals that would otherwise die at the negotiating table.

Look, I use earnouts on more deals than I don’t. Sellers overprice their business because they’re emotionally attached and they see the future through rose-tinted glasses. Buyers underprice because they’re the ones holding the risk. An earnout is how the two sides meet in the middle without either one caving.

I’ve closed 300+ deals in 30 years. Roughly half of them had an earnout attached in some form. Done right, it’s the most powerful tool in the dealmaker’s negotiating toolkit. Done wrong, it becomes a two-year lawsuit that eats the profit you were trying to protect.

Here’s how we structure earnouts inside Dealmaker Academy — the framework, the numbers, and the protection language that keeps you out of court.

What an Earnout Is (and What It Isn’t)

An earnout is contingent purchase-price consideration paid to the seller after close, tied to specific, measurable performance thresholds the business must hit within a set earnout period. It is not a seller note, it is not a bonus, and it is not deferred cash guaranteed to be paid regardless of results. It only pays if the business performs.

Three things define every earnout:

• The metric. Revenue, EBITDA, gross profit, customer retention, or a specific milestone. Pick one that’s clean, verifiable, and hard to manipulate.
• The period. Typically 1 to 3 years post-close. Longer than that and the seller loses influence over the result.
• The payout formula. Fixed dollar amount at threshold, sliding scale above threshold, or all-or-nothing at a target. Each has a different behavioral effect on the seller.

Get one of those three wrong and the earnout either fails to close the gap at signing or blows up in year two.

When to Use an Earnout in a Deal

Use an earnout any time there’s a real gap between what the seller believes the business is worth and what the numbers currently justify. That’s the primary use case, and it covers most of the deals I do. But there are five specific situations where I reach for an earnout before I reach for anything else.

• The seller is pricing off projections, not history. Trailing twelve months of EBITDA supports one number, the seller’s forward pitch supports a higher one. Put the delta in an earnout tied to hitting those projections.
• Customer or contract concentration risk. One customer at 40% of revenue. A key contract up for renewal. Tie a slice of the price to that customer or contract still being there in year two.
• A new product, market, or expansion in-flight. The seller says the new launch will double revenue. Great. Pay for it when it happens.
• Seller staying on to transition. If the seller is running the business for 12 to 24 months post-close anyway, an earnout keeps their compensation aligned with the outcome.
• Owner-dependent goodwill. Business runs on the seller’s relationships. Retention of those relationships becomes an earnout metric — because if they walk with the customer list, the deal was never real to begin with.

If none of those apply and the seller still wants an earnout, ask why. Sometimes the answer tells you the deal you’re being pitched isn’t the deal that actually exists.

Common Earnout Structures

The three earnout structures used in almost every private-company acquisition are revenue-based, EBITDA-based, and milestone-based. Each one solves a different problem, and each one creates a different dispute pattern. Pick the structure that matches the risk you’re actually trying to close.

Revenue-Based Earnout

Payout tied to top-line revenue crossing a threshold. Clean, easy to measure, hard for either side to dispute — revenue is revenue.

Use when: The dispute is about future growth, not future margin. The buyer intends to run the business roughly as-is. The industry has stable pricing so revenue and profit move together.

Watch out for: The seller pushing volume at any cost, discounting margins to hit the topline number. This is the number-one failure mode of a revenue earnout. If the buyer controls pricing decisions post-close, protect against margin destruction with a floor.

EBITDA-Based Earnout

Payout tied to earnings before interest, taxes, depreciation, and amortization crossing a threshold. Closer to enterprise value, punishes revenue growth that destroys margin.

Use when: Both sides need to be aligned on profitability, not just sales. The buyer plans to integrate the business and will spend on that integration. The seller stays involved and can influence cost decisions.

Watch out for: Every accounting adjustment becomes a fight. Buyer-driven overhead allocations, integration costs, one-time expenses — all of it reduces reported EBITDA and all of it becomes a dispute. Define adjusted EBITDA in the purchase agreement line by line. Not “generally accepted.” Line by line.

Milestone-Based Earnout

Payout tied to specific binary events: FDA approval, patent grant, a named contract renewed, an integration completed, a customer retained. All-or-nothing on each milestone.

Use when: The risk you’re pricing is one specific event, not a general trend. Startups with pending regulatory approval. Businesses with a make-or-break contract. Deals where the seller has a specific deliverable they promised.

Watch out for: Milestones defined loosely become negotiations. Write each one so it’s binary and evidenced by a document — the signed contract, the regulatory letter, the client confirmation email.

How to Size the Earnout

Size the earnout at 20% to 40% of total purchase consideration for most private-business acquisitions, with the exact percentage set by how much of the deal’s future performance is genuinely uncertain versus historically supported. Go smaller and the earnout doesn’t move the seller’s behavior. Go larger and the seller loses faith the payout will ever land, which kills their motivation and often kills the deal itself.

A working framework for sizing:

• Stable, historically-verified cash flow, no growth ask. Earnout 0% to 15%. Just use cash and a seller note.
• Solid history, seller pricing on modest projected growth. Earnout 15% to 25% of total consideration.
• Aggressive projections, concentration risk, or transition dependent on seller. Earnout 25% to 40%.
• Seller pricing on a bet — new product, new market, turnaround story. Earnout 40%+, sometimes structured with a floor and ceiling.

Above 40%, sellers stop treating the earnout as real money. They anchor on cash at close and start looking for a different buyer. Below 15%, it doesn’t do enough work to justify the paperwork.

Protection Clauses Every Earnout Needs

Protection clauses are the contract language that stops the earnout from becoming a two-year fight over what the numbers actually mean. Every earnout I sign has these seven provisions locked in, non-negotiable, before I fund a single dollar at close.

1. Defined metric with defined calculation. If it’s EBITDA, define exactly how it’s calculated. Which expenses are added back, which aren’t, how corporate overhead gets allocated. Ambiguity here is where lawsuits start.
2. Ordinary-course-of-business covenant. The buyer agrees to run the business normally during the earnout period. No shifting revenue to a sister company. No loading it with buyer-side overhead. No starving it of working capital.
3. Seller information rights. Monthly or quarterly financials delivered to the seller during the earnout period. If they can’t see the numbers, they can’t trust the numbers.
4. Audit right. Seller has the right, once per earnout period, to have an independent accountant review the calculation at their cost — unless the audit finds a material discrepancy, in which case the buyer pays.
5. Dispute resolution mechanism. Neutral third-party accounting firm named in advance. Not “we’ll agree at the time.” Named in the purchase agreement.
6. Acceleration on change of control. If the buyer sells or restructures the business during the earnout period, the earnout accelerates and pays out based on projected performance. Otherwise the buyer has an incentive to flip the business and stiff the seller.
7. Working capital protection. Buyer commits to a minimum working capital level. Without this, the buyer can strip cash out of the business and blame the earnout miss on operations.

Miss any of these seven and you’re building a dispute into the deal at signing.

The Disputes That Kill Earnouts (and How to Prevent Them)

Almost every earnout dispute traces back to one of four root causes, and every one of them is preventable at the purchase-agreement stage. Once the deal closes, your leverage to fix these problems drops to near zero. Fix them in the paper.

• Ambiguous performance metric. “EBITDA” without a definition. “Revenue” without specifying gross or net. “Customer retention” without defining what counts as a retained customer. Every ambiguous term becomes a negotiation the seller loses because the buyer controls the books.
• Buyer changes the business. New product lines, integration with a sister company, cost allocations from corporate, capital starvation. Any of these tanks the metric and gives the buyer plausible deniability. The ordinary-course covenant and working capital floor block this.
• Seller games the metric. Revenue earnout, seller sells at cost to hit the number. EBITDA earnout, seller cuts marketing and maintenance spend to inflate short-term earnings. Protect with margin floors, capex minimums, and a clawback provision.
• Personality conflict during earnout period. Seller stays on, buyer changes direction, they clash. Suddenly the earnout metric becomes a proxy for a personal fight. Write a clean separation clause — seller’s employment is not tied to earnout payment. Keep the two decisions independent.

An earnout is a contract, not a handshake. Every clause is written for the day the two sides stop being friends.

Earnouts vs Seller Notes: When to Use Which

Both defer part of the purchase price. That’s where the similarity ends.

A seller note is debt. Fixed payments, fixed timeline, paid regardless of performance. The seller is a lender. Personal guarantees and collateral apply.

An earnout is contingent equity-adjacent consideration. Paid only if the business performs. No fixed obligation, no guaranteed payment.

Use a seller note when the gap is about financing structure — the seller wants a payment stream, the buyer wants to conserve capital, neither disputes the underlying value. Use an earnout when the gap is about the actual value of the business — one side thinks it’s worth more than the numbers currently prove.

Most of my deals use both. Cash at close, a seller note for structured deferred payments, and an earnout for the gap between the buyer’s number and the seller’s number. Three tools, three different jobs.

Frequently Asked Questions

What is an earnout in a business acquisition?

An earnout is a portion of the purchase price paid to the seller after close, contingent on the business hitting agreed performance targets — typically revenue, EBITDA, or specific milestones — over a defined period, usually 1 to 3 years. It bridges the gap between what the seller wants and what the buyer will fund on day one, shifting execution risk onto the party best positioned to influence the outcome.

What percentage of a deal should be an earnout?

Most private-business earnouts land between 20% and 40% of total purchase consideration. Below 15% the earnout doesn’t move the seller’s behavior. Above 40% and the seller stops believing they’ll ever see the money and starts negotiating for more cash at close. The exact percentage depends on how much of the deal price is supported by trailing performance versus forward projections.

Is an earnout the same as a seller note?

No. A seller note is debt with fixed payments paid regardless of performance. An earnout is contingent consideration paid only if the business hits agreed targets. Seller notes solve a financing gap. Earnouts solve a valuation gap. Many deals use both.

What is the most common earnout structure?

EBITDA-based earnouts are the most common structure for profitable operating businesses, because EBITDA is closest to what actually drives enterprise value. Revenue-based earnouts are cleaner to measure but risk incentivizing volume at the expense of margin. Milestone-based earnouts are used for specific events like contract renewals, regulatory approvals, or product launches.

How long should an earnout period be?

One to three years is standard. Under one year, there’s not enough time for the seller to influence the outcome. Beyond three years, the seller loses control over enough variables that they can’t be held accountable for the result. Most of my deals run 2-year earnouts because that captures a full operating cycle without dragging on.

What are the biggest risks of an earnout for a buyer?

The two biggest buyer risks are seller behavior that games the metric — pushing revenue at low margin, cutting maintenance to inflate short-term earnings — and disputes over how the metric was calculated after the fact. Both are controlled at the contract stage with a defined metric calculation, margin floors, capex minimums, and a named dispute-resolution mechanism.

What are the biggest risks of an earnout for a seller?

The seller’s biggest risks are the buyer changing how the business operates in ways that tank the metric — new cost allocations, integration expenses, capital starvation, revenue shifted to sister entities. Protect with an ordinary-course-of-business covenant, working capital minimums, information rights, and acceleration on change of control.

Can an earnout be structured to protect against buyer manipulation?

Yes. Seven protections should be in every earnout: defined metric calculation, ordinary-course-of-business covenant, seller information rights, audit right, named dispute resolution firm, acceleration on change of control, and a working capital floor. Without those, the buyer controls the numbers and the seller has no recourse when the earnout misses.

Where can dealmakers learn to structure earnouts on live deals?

Dealmaker Academy walks earnout structures on real acquisition targets with Carl Allen and the coaching team, including the actual language used in successful deals. The Protégé Community is where active dealmakers workshop earnout structures with each other on deals in-flight.

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Next move: on the next deal you evaluate where the seller’s asking price is above what the trailing numbers support, put the delta in an earnout instead of walking away. See the other deal-structuring tools we use, or book a coaching call to structure a specific earnout with the team.