Earnouts in M&A: How They Work and How They Are Valued

An earnout is a contractual arrangement in which a portion of the purchase price in a business acquisition is paid contingently, based on the target company hitting defined performance milestones after closing. Earnouts bridge the valuation gap when a buyer and seller cannot agree on the current value of the business, letting the seller earn additional consideration if the company performs as expected. The earnout is recorded at fair value on the acquisition date under ASC 805, and its tax treatment depends heavily on how the arrangement is structured.

Why Earnouts Are Used

When a buyer and seller cannot agree on price, a deal often dies rather than closes. Earnouts solve that problem by sharing future risk. The seller gets paid more if the business delivers on its promises; the buyer pays only when that performance materializes.

Common reasons deal teams turn to earnouts include:

• Valuation gaps. A founder may believe post-close synergies or a pipeline of contracts justify a higher multiple. A buyer wants proof before paying for projections.
• Transition risk. If a key customer relationship or patent pipeline is uncertain, a contingent payment shifts that risk back to the seller.
• Seller financing substitute. Some earnout structures effectively give the seller a deferred payment that functions like seller financing without a formal note.
• Industry volatility. Healthcare, technology, and early-stage businesses are frequent earnout candidates because their revenue trajectories are harder to underwrite at closing.

According to the SRS Acquiom 2026 Deal Terms Study, roughly 24% of private-target M&A deals completed in 2025 (excluding life sciences) included an earnout, up from 22% in 2024. Frequency varies with deal size and sector, and this figure reflects a deal-study estimate rather than a codified rule.

How Earnouts Are Structured

The basic architecture of an earnout involves five components: the metric, the measurement period, the payout formula, any caps or floors, and the dispute mechanism.

Choosing the Right Metric

The choice of metric drives every downstream decision, from valuation to accounting classification to litigation risk. Common metrics include:

• Revenue. Easy to measure and hard to manipulate, but it rewards top-line growth even when margins deteriorate. Buyers should watch for sellers pulling forward revenue to hit targets.
• EBITDA. Better aligned with business value but susceptible to accounting policy choices. Parties should specify whether EBITDA is computed pre- or post-management fees, unusual charges, and buyer-imposed overhead allocations.
• Gross profit. A middle ground that avoids SG&A disputes while capturing margin.
• Milestone-based triggers. Drug approvals, contract executions, or product launches work well for companies whose value is binary rather than continuous.

Measurement Period and Payout Formula

Most earnouts run 1 to 3 years post-close. Longer periods increase uncertainty and make fair-value measurement harder. The payout formula should define exactly what is included and excluded from the metric. Ambiguity is the single largest source of earnout litigation.

Caps, Floors, and Ratchets

A hard cap limits the buyer’s maximum exposure. A floor may guarantee a minimum payment if the metric clears a base threshold. Ratchet structures pay a percentage of each dollar of performance above target, creating option-like payoffs rather than all-or-nothing outcomes.

Earnout Accounting Under ASC 805

Under ASC 805, Business Combinations, the acquirer must recognize contingent consideration at fair value as of the acquisition date and include it in the total consideration transferred. See the AICPA overview of contingent consideration accounting rules for practitioner guidance. This acquisition-date recognition is a key feature of current GAAP, in contrast with older practice that deferred recognition until the contingency was resolved.

Classification: Liability or Equity?

After initial measurement, the acquirer must classify the earnout as either a liability or equity. This classification has significant consequences for income-statement volatility.

• Liability classification applies when the earnout is settled in cash or in a variable number of shares. Liability-classified earnouts are remeasured at fair value every reporting period, and any change in fair value runs through earnings (typically as a gain or loss in operating or other income). A company that acquires a business and later learns the earnout target will be missed will record a gain when it reduces the liability to its new fair value.
• Equity classification applies when the earnout is settled in a fixed number of the acquirer’s own shares and meets the conditions in ASC 815-40. Equity-classified earnouts are not remeasured after the acquisition date. Changes in probability of payout do not affect reported earnings.

Most earnouts are cash-settled and therefore classified as liabilities, which means most acquirers face ongoing fair-value remeasurement risk.

Consideration vs. Compensation

A critical judgment under ASC 805 is whether the earnout represents additional purchase price or post-close compensation for services. Payments that are conditioned on the seller’s continued employment and that would be forfeited upon termination are generally characterized as compensation, not consideration. The distinction matters enormously: compensation is expensed immediately, while purchase-price consideration is capitalized into goodwill and amortized over time (or not amortized at all under purchase accounting for indefinite-lived intangibles). If market-rate employment agreements for post-close services already exist separately, the earnout is more likely to be treated as consideration.

How Earnouts Are Valued

Fair-value measurement of an earnout is not straightforward, because the payout depends on future uncertain events. The goal is to estimate the expected present value of the payments, accounting for both business risk and time value.

Scenario-Based Models

For simple, single-period earnouts with a fixed cap, a probability-weighted scenario analysis may be sufficient. The analyst assigns probabilities to discrete outcomes (for example, “hits target,” “misses target,” “exceeds target by more than 20%”) and calculates the probability-weighted payout, discounted at an appropriate rate.

Option Pricing and Monte Carlo Simulation

For more complex structures, such as multi-year earnouts, catch-up provisions, or interdependent metrics, the profession has moved toward option-pricing frameworks, often implemented via Monte Carlo simulation. According to guidance from the AICPA’s accounting and valuation community, the preferred approach for earnouts based on non-diversifiable financial metrics (such as revenue or EBITDA) is the option pricing method, using risk-neutral simulation in which the metric’s drift is replaced with the risk-free rate and the volatility is estimated from comparable public companies or implied volatility data.

The Monte Carlo process works by running thousands of simulated paths for the earnout metric, computing the payout under each path, discounting each payout to present value at the risk-free rate, and averaging across all trials. This approach captures path dependency, multiple hurdles, and ratchet features that scenario analysis cannot handle cleanly.

Discount rates for earnouts differ by risk profile. An earnout tied to revenue generally carries a higher discount rate than one tied to a milestone (which may be modeled as an option on an asset that pays off at a single date). Selecting the wrong discount rate is one of the most common valuation errors in purchase price allocation.

For further technical guidance, the AICPA published a 2019 practice aid, Valuation of Contingent Consideration, that sets out these methods in detail. The AICPA resource library on contingent consideration is a useful entry point.

Tax Treatment of Earnouts

Tax rules for earnouts are distinct from the accounting rules and apply separately to buyers and sellers. The core question is whether the earnout is deferred purchase price or compensation for services, and the answer is not always the same for accounting and tax purposes.

Seller Tax Treatment

Capital gains vs. ordinary income. If the earnout is deferred purchase price (not conditioned on continued employment and not tied to services), a seller generally reports earnout receipts as capital gain, subject to long-term rates if the underlying asset was held more than 12 months. If the earnout is tied to continued services, the IRS is likely to treat it as ordinary income subject to employment taxes, regardless of how the parties label it.

Installment sale method under IRC 453. When a seller accepts a contingent payment obligation, IRC Section 453 generally requires installment sale reporting. Under the installment method, the seller recognizes gain as payments are received, using a gross profit ratio. For example, if the total gain on a $20 million sale is $16 million, the gross profit ratio is 80%, and the seller recognizes 80 cents of gain for every dollar of earnout received.

Contingent payment regulations. Treasury Regulation Section 15a.453-1(c) addresses contingent payment sales under three frameworks: (1) if there is a stated maximum selling price, the seller uses the cap to compute the gross profit ratio; (2) if there is no cap but a fixed measurement period, the seller recovers basis ratably over the period; (3) if neither a cap nor a fixed period exists, the seller recovers basis pro rata over 15 years. The practical implication: most earnouts should be structured with either a cap or a defined measurement period to avoid the 15-year default, which can result in gain recognition before basis recovery.

Depreciation recapture. One trap that surprises sellers: depreciation recapture under IRC 1245 and 1250 is recognized in full in the year of sale, regardless of the installment method. A seller cannot defer recapture income across earnout years.

Imputed interest. When an earnout will be paid in future years, the tax law may treat a portion of each payment as imputed interest under IRC 483 or the original issue discount rules, taxed at ordinary income rates. Parties should consider stating a market interest rate in the purchase agreement to control how interest is characterized.

Buyer Tax Treatment

A buyer’s tax treatment turns on the same classification question. If the earnout is purchase price, the buyer capitalizes it as additional basis in the acquired assets (or goodwill) and amortizes it over 15 years under Section 197. If the earnout is compensation, the buyer deducts it immediately when paid. Buyers often prefer compensation treatment for the current deduction; sellers prefer capital-gain treatment. This tension should be resolved explicitly in the purchase agreement.

Section 409A Considerations

If the earnout has characteristics of nonqualified deferred compensation, Section 409A can apply and impose additional taxes and penalties. Earnouts that are conditioned on employment and payable on a schedule that is not tied to a fixed date or permissible trigger event risk Section 409A treatment. Structuring earnouts to avoid Section 409A exposure is an important pre-close planning step. Modus’s transaction tax advisory team works through these issues during due diligence.

Common Earnout Disputes and How to Prevent Them

Earnout disputes are among the most common post-closing M&A controversies. SRS Acquiom deal data indicate that earnouts are contested at least 28% of the time, and disagreements typically center on how the performance metric was calculated.

The most frequent friction points are:

• Accounting policy changes. A buyer that changes revenue recognition policies, cost allocation methods, or depreciation schedules post-close can depress the earnout metric without breaching the agreement.
• Seller access to information. Without audit rights and periodic reporting requirements, sellers may have no way to verify whether the metric was computed correctly.
• Integration decisions. A buyer that absorbs the acquired business into a larger division may eliminate stand-alone financial reporting, making earnout measurement impossible.

Deal teams should address each of these in the purchase agreement’s earnout provisions. Specifying that the earnout metric will be computed on a standalone basis, using the same GAAP policies in effect at closing, and subject to independent review if disputed, goes a long way toward preventing post-closing conflict.

Modus’s transaction advisory practice supports both buyers and sellers through earnout design, fair-value measurement, and post-close monitoring.

Related reading: Private Equity Audit: Fund Requirements and Prep

Frequently Asked Questions

How does an earnout work in a business acquisition?

An earnout is a deferred portion of the purchase price that the seller receives only if the acquired business meets agreed performance targets, such as revenue or EBITDA thresholds, over a defined period after closing. The seller receives the contingent payment when the metric is met; if targets are missed, the payment is reduced or eliminated.

How is contingent consideration recorded under GAAP?

Under ASC 805, contingent consideration is recognized at fair value on the acquisition date and included in total purchase price. If classified as a liability (which is most common for cash-settled earnouts), it is remeasured at fair value each reporting period, with changes in fair value recognized in earnings. Equity-classified earnouts are not remeasured.

Are earnout payments taxed as capital gains or ordinary income?

It depends on structure. Earnout payments that represent deferred purchase price, not conditioned on the seller’s continued employment, are generally taxable as capital gain under the installment sale rules of IRC 453. Payments conditioned on continued services are typically treated as ordinary income subject to employment taxes. Imputed interest rules may also convert a portion of future payments to ordinary income.

What is the installment sale method and how does it apply to earnouts?

Under IRC 453, sellers who receive contingent payments recognize gain as each payment is received, proportional to the gross profit ratio (total gain divided by total selling price). This allows sellers to spread gain recognition over the earnout period rather than paying all taxes in the year of sale. Depreciation recapture must still be recognized in full in the year of sale.

How are earnouts valued for purchase price allocation purposes?

Earnouts are valued using fair-value methodologies that account for the probability and timing of reaching performance targets. Simple earnouts may use probability-weighted scenario analysis. Complex, multi-year, or path-dependent earnouts are typically valued using an option pricing model, often implemented through Monte Carlo simulation, using risk-neutral assumptions and a risk-free discount rate.

What happens if a buyer misses the earnout target?

If the earnout metric is not met, the contingent payment is reduced or eliminated per the agreement’s formula. For accounting purposes, a liability-classified earnout would be marked down to its new fair value, and the reduction is recognized as a gain in the acquirer’s income statement. For the seller, no additional tax is owed on payments not received, but any basis recovery that was deferred under the installment method must be recalculated.