Earnout Agreements: Tax Treatment, Risks, and How to Negotiate

An earnout lets a buyer pay you more if the business performs — but it also lets them pay you less than you think you agreed to. The tax trap is even worse: a poorly structured earnout can convert capital gains into ordinary income. Here's how to approach this deal structure with clear eyes.

What an earnout is and why buyers use them

An earnout is a contingent payment clause in an acquisition agreement. You close the sale today at a lower certain price, and receive additional payments over 2–5 years if the business hits agreed milestones — typically revenue, EBITDA, gross profit, or specific operational targets.

Buyers propose earnouts in three main situations:

• Valuation gap. You think the business is worth $15M. The buyer thinks it's worth $11M. An earnout bridges the gap: $11M at close, up to $4M over three years if EBITDA targets are met.
• Revenue concentration risk. If 40% of revenue runs through two customers, the buyer discounts for that uncertainty. An earnout shifts some of that risk back to you — you get full price if those customers stay.
• Transition dependency. When the business is deeply tied to you personally, a buyer may want you financially incentivized to stick around during the handover. (This is where the tax trap lives — see below.)

The tax trap: capital gains vs. ordinary income

This is the most important issue in earnout structuring — and the one most sellers miss until it's too late to fix.

If your earnout is treated as part of the purchase price, payments are capital gains (long-term, if the underlying stock or assets were held more than a year). In 2026, long-term capital gains rates are 0%, 15%, or 20% depending on income — plus the 3.8% Net Investment Income Tax (NIIT) for high earners, for a federal top rate of 23.8%.¹

If your earnout is treated as compensation for services — because it's contingent on your continued employment or tied to your personal contributions — it's ordinary income. Ordinary income is taxed at up to 37% federal in 2026, plus applicable payroll taxes.²

On a $4M earnout, the difference is roughly $530,000 in federal taxes. That's not a rounding error.

What the IRS looks at

The IRS evaluates several factors when determining whether earnout payments are purchase price or compensation:³

• Is the earnout conditioned on continued employment? If you must remain employed to receive it, the IRS will scrutinize whether it's really deferred compensation.
• Is your post-closing employment comp at market rate? If you're paid below-market salary, the IRS may recharacterize earnout payments as the missing compensation. Conversely, separate market-rate employment compensation makes earnout payments look more like purchase price.
• Is the earnout proportional to your equity ownership? An earnout that distributes in proportion to equity ownership (all shareholders share it based on their percentage) looks like purchase price. An earnout that pays only the selling founder looks like personal compensation.
• Is the earnout payable to heirs if you die? If it survives your death and pays your estate, that strongly supports purchase price treatment — compensation ceases at death.
• Are the metrics tied to the whole company or to you personally? Company EBITDA is a company performance metric. "Revenue attributable to accounts you personally manage" is compensation-flavored.

How the IRS taxes contingent payments: IRC §453 and three scenarios

Once you've established that your earnout is purchase price, the next question is when you pay tax. Contingent payment sales are governed by IRC § 453 and Treasury Regulation § 15a.453-1(c).⁴ How your gain is recognized depends on the structure of the contingency:

Scenario 1: Stated maximum price (most common)

If the acquisition agreement caps the total earnout at a stated maximum amount, you know the highest possible purchase price as of the closing date. The IRS treats this as a single sale at the maximum price. Your basis is allocated proportionally, and each payment is taxed at the gross profit ratio (gain ÷ maximum contract price) as you receive it.⁴

Example: $11M at close + up to $4M earnout = $15M maximum. Your basis is $1M. Gross profit ratio = $14M ÷ $15M = 93.3%. Each dollar received — whether at close or in year 3 — is 93.3% taxable gain.

This is the cleanest structure for tax purposes. Push for a stated maximum even if the buyer resists — a cap that's generous enough to not actually limit upside still locks in favorable installment treatment.

Scenario 2: Fixed payment period, no stated maximum

If there's no dollar cap but the earnout has a defined payment period (say, 3 years), the IRS allocates your total basis equally over that period. Each year, you recover the period's allocated basis first; the rest is gain. If a year's payment is less than the allocated basis, you get a loss in that year; if more, you recognize gain.⁴

Scenario 3: No maximum, no fixed period (open transaction)

If neither a maximum price nor a fixed period can be determined, the IRS allows a "ratable basis recovery" approach: basis is spread evenly over 15 years. In very rare cases where there is no reasonable basis for any valuation, the open transaction doctrine may apply — gain deferred until all basis is recovered. The IRS scrutinizes open transaction treatment closely; it's available only when the fair market value of the right to receive payments "cannot reasonably be ascertained."⁴

Electing out of installment treatment

You can elect out of § 453 and report the full gain in the year of sale — paying tax on the fair market value of your right to future earnout payments at closing. This rarely makes economic sense unless you expect to be in a higher bracket in future years. If the right has no determinable FMV, you can defer until payments are received. Consult your advisor before electing out — the tradeoffs depend entirely on your specific tax situation.

Asset sale vs. stock sale: earnout character follows the underlying

In a stock sale, your gain — including earnout payments — is almost always long-term capital gain if you've held the stock more than one year. QSBS holders note: § 1202 exclusions apply to amounts realized, including contingent payments received in later tax years under installment reporting.⁵

In an asset sale, different asset classes have different tax treatment. Earnout payments must be allocated across the § 1060 / Form 8594 asset classes from the original sale. Amounts allocated to goodwill produce capital gains; amounts allocated to inventory, receivables, or § 1245 property (recaptured depreciation) produce ordinary income. Make sure the purchase price allocation in your acquisition agreement is explicit and allocates earnout payments to capital-gain classes wherever legally defensible.⁶

What earnout metrics to agree to — and which to avoid

The metric determines not just whether you're paid, but how much control you have over the outcome after you've sold.

Protect your EBITDA definition

If you agree to an EBITDA earnout, negotiate explicit exclusions:

• Corporate overhead or management fee allocations from parent entity
• Integration costs and transaction-related expenses
• New hires added by the buyer that weren't in your budget
• Accounting methodology changes from your historical GAAP
• Impairment charges triggered by the acquisition

Anti-manipulation and dispute resolution provisions

The earnout period is the most litigated phase of any M&A deal. You've sold the business and no longer control decisions, but your payout depends on those decisions. Protect yourself before you sign:

Accounting method covenants

Require that the business maintain consistent accounting methods throughout the earnout period. Specify that the buyer cannot change revenue recognition policies, depreciation elections, or consolidation approaches without your written consent. Tie the earnout calculation to the same GAAP basis as the trailing-12-month financials used in due diligence.

Operational covenants

Negotiate restrictions on buyer actions that could undermine performance: budget minimums for the acquired business unit, prohibitions on redirecting customers to affiliates, and requirements that the acquired business be operated as a going concern during the earnout period.

Earnout statement and audit rights

The acquisition agreement should require the buyer to deliver a detailed earnout calculation within 30–60 days of each measurement period, with supporting financial statements. You should have 30–60 days to dispute the calculation, with the dispute resolved by an independent accounting firm if you can't agree. This is standard in well-drafted M&A agreements and buyers should not resist it.

Acceleration on change of control or breach

If the buyer sells the business during the earnout period, your remaining earnout should be accelerated — otherwise the next buyer has no obligation to you at all. Similarly, if the buyer materially breaches operating covenants, you should have the right to demand immediate payment.

Earnout vs. seller note: comparing the risk profiles

Both structures mean you've sold the business without being fully paid. The risks differ fundamentally:

• Seller note: fixed obligation, buyer owes you regardless of performance. Default is clear and legally enforceable. No upside beyond the interest rate. See our Seller Financing Guide for full analysis.
• Earnout: contingent on future performance. Upside if the business thrives; zero if it misses targets. Dispute risk is endemic. Harder to enforce than a debt instrument.

Most sellers prefer seller notes when they have the choice. A missed debt payment is an unambiguous default; a missed earnout target may be legitimate, manufactured, or litigable — and the legal costs to find out are high. The premium an earnout offers must be large enough to compensate for that ambiguity.

When to push back on an earnout

Refuse or significantly limit an earnout when:

• You'll have no operational control post-close. If the buyer is integrating your business into a larger entity and you won't be running it, you have no ability to protect the metrics your earnout depends on.
• The earnout period is long. Beyond 3 years, a lot can go wrong that has nothing to do with the business you sold. Push for shorter periods and higher certain payments.
• The metrics aren't clearly defined. If revenue recognition, EBITDA definition, or milestone criteria aren't specified with accounting-level precision in the LOI, they'll be worse in the final agreement. Walk away from ambiguity.
• The buyer has a track record of earnout disputes. Ask your M&A attorney to research the buyer's prior acquisitions. Repeat earnout disputes are a pattern, not a coincidence.
• You need the certainty. Earnouts are deferred and contingent. If your post-sale financial plan is built around a specific dollar amount by a specific date, earnouts introduce risk you may not be able to absorb.