Key Takeaways
- →Earnouts appear in 20-30% of middle-market deals and represent 10-30% of the purchase price - but they generate more post-closing disputes than any other deal provision
- →Revenue-based earnouts are harder to manipulate; EBITDA-based earnouts are easier to game through expense allocation and accounting changes
- →Delaware courts have awarded $1B+ in damages to sellers where buyers breached "commercially reasonable efforts" covenants (2024-2025 rulings)
- →The 7 essential clauses - metric definition, operating covenants, reporting rights, dispute resolution, acceleration, anti-offset, and security - prevent the vast majority of earnout disputes
- →Tax treatment varies by deal structure - capital gains in stock sales, potentially ordinary income in asset sales depending on Section 1060 allocation
An earnout sounds simple: sell your business, get some money now, get the rest later if the business hits certain targets. In theory, earnouts align buyer and seller interests. In practice, they are the single most litigated provision in M&A purchase agreements.
The problem isn't the concept - it's the execution. Vague performance metrics, missing operating covenants, no dispute resolution mechanism, and ambiguous accounting definitions turn a reasonable deal structure into a post-closing lawsuit waiting to happen.
This guide covers how earnout agreements actually work, what goes wrong, and the specific contract provisions that prevent disputes - written from the perspective of an M&A attorney who has negotiated earnouts on both sides of transactions across industries.
What Is an Earnout Agreement?
An earnout is a contingent purchase price mechanism where a portion of the total consideration is paid after closing, contingent on the acquired business achieving defined performance targets over a specified period.
Earnout Anatomy: How the Numbers Work
$5M
Total deal value
$3.75M
Paid at closing (75%)
$1.25M
Earnout (25%, over 3 yrs)
When Earnouts Make Sense
Good Use Cases
- Buyer and seller disagree on valuation by 15-30%
- Business has strong growth trajectory but unproven sustainability
- Seller is staying on to manage post-closing
- Key customer relationships are seller-dependent
- Regulatory milestones are pending
Poor Use Cases
- Seller wants a clean exit with no post-closing involvement
- Buyer plans to significantly restructure the business
- Performance metrics can't be measured independently
- Buyer and seller have fundamentally different business philosophies
- The earnout substitutes for proper due diligence
Earnout Structures: Revenue vs. EBITDA vs. Milestones
The metric you choose determines who bears the risk, how easy it is to game the system, and how likely you are to end up in court. Here's how the three primary structures compare:
| Factor | Revenue-Based | EBITDA-Based | Milestone-Based |
|---|---|---|---|
| Manipulation risk | Low | High | Medium |
| Measurement simplicity | Simple - top-line, fewer adjustments | Complex - expense definitions are negotiable | Binary - hit or miss, but "hit" must be defined |
| Seller preference | Strongly preferred | Acceptable with protections | Depends on milestone type |
| Buyer preference | Acceptable - revenue doesn't equal profit | Strongly preferred | Preferred for binary outcomes |
| Dispute frequency | Lower - fewer accounting arguments | Higher - EBITDA adjustments are subjective | Moderate - "was the milestone met?" is the question |
| Best for | Growth-stage businesses, SaaS, services | Mature businesses with stable margins | Pharma/biotech, tech (product launches) |
Buyer's EBITDA Manipulation Playbook (And How Sellers Prevent It)
With EBITDA-based earnouts, buyers have multiple levers to suppress the metric:
- Expense loading: Allocating corporate overhead, management fees, or shared service costs to the acquired business
- Revenue diversion: Steering new customers or contracts to other subsidiaries
- Accounting changes: Switching from cash to accrual, changing revenue recognition policies, or reclassifying expenses
- Underinvestment: Cutting marketing, sales, or R&D budgets to suppress short-term revenue
- Key employee disruption: Reassigning the seller's team or creating hostile working conditions
Prevention: Require "consistent with past practices" operating covenants, lock GAAP accounting methods, exclude buyer-allocated overhead from the EBITDA calculation, and include seller audit rights.
Earnout Economics: Typical Sizes, Timelines, and Structures
| Parameter | Typical Range | Notes |
|---|---|---|
| Earnout as % of total price | 10-30% | Can reach 50% in high-uncertainty deals |
| Earnout period | 1-3 years (up to 5) | Annual measurement most common |
| Payment timing | 60-120 days after measurement period | Allows time for calculation and audit |
| Threshold vs. linear | Both common | Threshold: all-or-nothing. Linear: proportional payment above a floor |
| Cap (maximum payout) | Usually equals earnout amount | Some deals include uncapped upside - rare but powerful for sellers |
| Carry-forward / netting | Negotiable | Carry-forward: shortfalls in Year 1 must be made up. Netting: excesses offset shortfalls |
Payment Structure: Threshold vs. Linear vs. Tiered
Threshold (All-or-Nothing)
Hit the target = full payment. Miss by $1 = $0.
Example: $500K if EBITDA exceeds $2M. At $1.99M = $0. At $2.01M = $500K.
Risk: High - creates "cliff" incentives
Linear (Proportional)
Payment scales proportionally between a floor and ceiling.
Example: $0 at $1.5M EBITDA, $500K at $2.5M, proportional between. At $2M = $250K.
Risk: Low - most equitable for both sides
Tiered (Step Function)
Payment increases at defined performance tiers.
Example: $150K at $1.8M, $300K at $2.2M, $500K at $2.5M+.
Risk: Medium - creates negotiation around tier thresholds
Real-World Earnout Disputes: What Goes Wrong
Earnout disputes have surged in Delaware Chancery Court, with several billion-dollar rulings in 2024-2025 that reshaped how buyers and sellers negotiate these provisions.
J&J / Auris Health: Buyer Prioritized Own Product Over Acquired Platform
Johnson & Johnson acquired Auris Health for up to $5.75B ($3.4B upfront + $2.35B earnout tied to regulatory milestones). Post-closing, J&J redirected development resources from Auris's iPlatform to its own Velys robotic system, effectively starving the earnout milestones.
Ruling: Court held J&J breached its "commercially reasonable efforts" covenant and the implied covenant of good faith. Sellers awarded damages exceeding $1 billion.
Lesson: Define "commercially reasonable efforts" with objective benchmarks. Include anti-resource-diversion clauses that prevent buyers from favoring competing internal products.
Alexion / AstraZeneca: Buyer Killed Drug Program Despite "Efforts" Covenant
After AstraZeneca acquired Alexion, it terminated the ALXN1830 drug program - the key milestone for the earnout - citing safety concerns. Sellers argued the termination fell short of the efforts a "similarly situated company" would have devoted.
Ruling: Court found buyer liable - the "commercially reasonable efforts" standard was measured against what a hypothetical peer company would do, not what the buyer subjectively decided.
Lesson: "Commercially reasonable efforts" is an objective standard. Buyers cannot unilaterally terminate earnout-critical programs without meeting the benchmark of what a similarly situated company would do.
Medtronic: "Sole and Absolute Discretion" Language Shielded Buyer
Sellers alleged Medtronic imposed unfavorable terms, caused salesperson exodus, deferred marketing, and avoided regulatory clearances to dodge a $100M milestone payment. The purchase agreement, however, granted Medtronic "sole and absolute discretion" over operations.
Ruling: Case dismissed. Court upheld buyer's broad discretion language, finding no breach absent explicit operational covenants.
Lesson for sellers: Never accept "sole and absolute discretion" language without operating covenants. The Medtronic outcome is what happens when sellers don't negotiate earnout protections.
Don't Leave Your Earnout to Chance
Whether you're buying or selling, the earnout language in your purchase agreement determines whether you collect or litigate.
The 7 Essential Earnout Clauses
Every earnout agreement should include these seven provisions. Miss any one and you're creating a future dispute.
Precise Metric Definition
Define exactly how the earnout metric is calculated - which GAAP standards apply, what adjustments are permitted, which expenses are included/excluded. Attach a sample calculation as an exhibit to the purchase agreement.
Bad: Vague
"EBITDA as generally determined"
Good: Specific
"EBITDA calculated per GAAP applied consistently with the Target's pre-closing practices, excluding Buyer-allocated overhead, inter-company charges, and purchase accounting adjustments"
Operating Covenants
Require the buyer to operate the business "in material accordance with past practices" during the earnout period. Specify what the buyer cannot do without seller consent: change accounting methods, reallocate key employees, materially reduce marketing or R&D spend, or divert customers.
Key insight: The J&J/Auris and Alexion cases both turned on whether the buyer met its "commercially reasonable efforts" standard. Without operating covenants, the Medtronic case shows buyers can act with impunity.
Reporting and Audit Rights
Seller must receive quarterly financial reports for the earnout business, access to books and records, and the right to audit the earnout calculation with an independent accountant at the seller's expense (buyer pays if the audit reveals a variance exceeding a specified threshold, typically 5-10%).
Dispute Resolution Waterfall
Establish a structured process for resolving disagreements before they become lawsuits:
Buyer delivers earnout calculation with supporting documentation within 90 days of period end
Seller has 30-60 days to review, object, and identify specific disputed items
Parties negotiate disputed items for 15-30 days
Unresolved items submitted to independent accountant - determination is binding, loser pays fees
Acceleration Triggers
The maximum remaining earnout becomes immediately payable if:
- Change of control: Buyer sells the acquired business or its parent company
- Termination without cause: Seller is terminated during the earnout period (if seller employment is part of the deal)
- Material breach: Buyer materially breaches operating covenants
- Business dissolution: Buyer shuts down or materially winds down the earnout business
Anti-Offset Provision
Prevent the buyer from offsetting indemnification claims against earnout payments. Without this clause, buyers can manufacture or inflate indemnification claims to reduce or eliminate earnout obligations. At minimum, require that any offset be supported by a final, non-appealable judgment or mutual written agreement.
Payment Security
Ensure the buyer can actually pay the earnout when due. Options include: a letter of credit, escrow deposit, parent company guaranty, or a security interest in the acquired business assets. Without payment security, the seller bears the risk that the buyer becomes insolvent during the earnout period - or simply refuses to pay and forces the seller into litigation.
Tax Treatment of Earnout Payments
How earnout payments are taxed depends on the deal structure and how the payments are characterized in the purchase agreement:
| Structure | Tax Treatment | Key Consideration |
|---|---|---|
| Stock/equity sale | Capital gains (installment method, IRC §453) | Earnout treated as additional purchase price - most favorable for sellers |
| Asset sale - goodwill allocation | Capital gains | Portion allocated to goodwill under Section 1060 receives capital gains treatment |
| Asset sale - compensation allocation | Ordinary income | If earnout is tied to seller's continued employment, IRS may recharacterize as compensation |
| Hybrid / consulting arrangement | Ordinary income | Earnout payments conditioned on consulting services are taxed as income |
Tax Planning Tip
Clearly separate the earnout from any employment or consulting arrangement in the purchase agreement. If the earnout is tied to the seller "remaining employed," the IRS will argue the payments are compensation (ordinary income rates up to 37%) rather than purchase price adjustments (capital gains at 20%). The purchase agreement should state that the earnout is consideration for the sale of the business and not conditioned on continued employment.
How We Structured a $650K Earnout That Both Sides Accepted
A buyer offered $3.2M for a professional services firm. The seller valued it at $3.85M based on a pipeline of new contracts that hadn't yet materialized. The gap: $650K.
Here's the earnout structure we negotiated:
- Metric: Revenue (not EBITDA) - simpler, harder to manipulate in a services business
- Structure: Linear between $2.8M and $3.5M annual revenue, with $650K maximum payout
- Period: 2 years (annual measurement), payments due 90 days after each year-end
- Operating covenants: Buyer required to maintain marketing spend at 85%+ of trailing 12-month average
- Audit rights: Seller receives monthly revenue reports and annual audit right
- Acceleration: Full earnout payable on change of control or termination of seller without cause
- Security: Seller retained a second-lien security interest in the business assets
Result: Year 1 revenue hit $3.1M - seller received $279K. Year 2 revenue hit $3.4M - seller received $371K. Total earnout paid: $650K (full amount). Zero disputes. The buyer paid $3.85M total - the seller's asking price - but spread the risk over two years with protection on both sides.
Selling Your Business? Protect Your Earnout.
The earnout language in your purchase agreement determines whether you collect or litigate. Get it right the first time.
We engage selectively. Nationwide practice. Managing partner on every deal.
Frequently Asked Questions
What is an earnout in an M&A deal?
An earnout is a contingent payment in a business acquisition where a portion of the purchase price is paid after closing, contingent on the business achieving specified performance targets. Typical earnout metrics include revenue, EBITDA, or specific milestones. Earnouts bridge valuation gaps between what the buyer is willing to pay upfront and what the seller believes the business is worth, shifting some acquisition risk from the buyer to the seller.
What percentage of the purchase price is typically an earnout?
Earnouts typically represent 10-30% of the total purchase price, though they can range from as low as 5% to as high as 50% depending on the risk profile. For a $5M deal, a typical earnout might be $750K-$1.5M paid over 2-3 years. The earnout percentage tends to increase when there is greater uncertainty about the business's future performance, when the seller is staying on to manage, or when there's a significant valuation gap between buyer and seller expectations.
How long do earnout periods typically last?
Most earnout periods run 1-3 years for middle-market deals, though they can extend to 5 years in complex transactions. The measurement period is usually annual (calculated each year-end), with payments due 60-120 days after the close of each measurement period. Shorter earnout periods favor sellers (less time for buyers to manipulate results), while longer periods favor buyers (more time to validate performance assumptions).
Are earnouts taxed as capital gains or ordinary income?
The tax treatment depends on the deal structure and how the earnout is classified. In stock or equity sales, earnout payments are generally treated as additional purchase price and taxed at capital gains rates under the installment method (IRC Section 453). In asset sales, the tax treatment depends on the Section 1060 allocation - portions allocated to goodwill receive capital gains treatment, while portions allocated to consulting or employment agreements are taxed as ordinary income. Tax structuring should be addressed in the purchase agreement.
Should I use revenue or EBITDA as the earnout metric?
Revenue is simpler to measure, harder for buyers to manipulate, and better for high-growth businesses where profitability hasn't stabilized. EBITDA captures profitability and is preferred by buyers because it accounts for cost management, but it's easier to manipulate through expense allocation, overhead loading, or accounting changes. For sellers, revenue-based earnouts with clearly defined recognition rules are generally safer. For buyers, EBITDA-based earnouts tied to consistent accounting policies are preferred.
What happens if the buyer deliberately sabotages the earnout?
Most earnout provisions include an implied covenant of good faith and fair dealing, and many include explicit 'commercially reasonable efforts' covenants requiring the buyer to operate the business in a manner consistent with past practices. If the buyer deliberately sabotages performance - by diverting customers, cutting marketing, reallocating resources, or changing accounting methods - the seller can bring a breach of covenant claim. Recent Delaware Chancery decisions (2024-2025) have awarded sellers over $1 billion in damages for buyer manipulation of earnout targets.
Can earnout disputes be resolved without litigation?
Yes, and they should be. Well-drafted earnout agreements include a dispute resolution waterfall: (1) the buyer delivers the earnout calculation with supporting documentation, (2) the seller has 30-60 days to review and object, (3) disputed items are submitted to an independent accountant whose determination is binding, and (4) the losing party pays the accountant's fees. This process resolves most calculation disputes without litigation. However, covenant breaches (buyer sabotage, operational changes) typically require court intervention.
Should the seller stay involved in the business during the earnout period?
It depends on who controls the earnout metrics. If the earnout is tied to performance the seller can influence (sales, client relationships, specific projects), seller involvement increases the probability of earnout achievement. But the employment arrangement creates complications: the seller becomes an employee with reduced control, and earnout payments may be reclassified as compensation (taxed at ordinary income rates). The purchase agreement should clearly separate the earnout from any employment or consulting arrangement.
What is an earnout acceleration clause?
An earnout acceleration clause requires the buyer to pay the maximum remaining earnout immediately if certain triggering events occur - most commonly a change of control (the buyer resells the business), termination of the seller without cause during the earnout period, or a material breach of the operating covenants. Acceleration clauses protect sellers from buyers who acquire, flip the business, and leave the earnout unpaid. They are increasingly standard in middle-market deals.
How common are earnouts in M&A deals?
Approximately 20-30% of middle-market M&A transactions include some form of earnout, with the percentage increasing in uncertain economic environments, high-growth industries, and deals where there is a significant valuation gap. Earnouts are most common in technology, healthcare, and professional services acquisitions where future performance is heavily dependent on key personnel or uncertain revenue streams. The frequency has increased over the past decade as deal multiples have risen.
Related Resources
How to Sell a Small Business: Owner's Guide
The complete seller's guide from preparation to closing day.
Purchase AgreementsRepresentations and Warranties in M&A
How reps and warranties create the legal basis for post-closing indemnification claims.
M&A AttorneyWhat Does an M&A Attorney Do?
Learn how an experienced M&A attorney protects your interests from LOI to closing.