Contingent Consideration Tax Treatment: Asset and Stock Deals

Contingent consideration in a merger or acquisition, most often an earnout tied to post-closing performance, is taxed according to how the underlying deal is structured. The tax treatment of contingent consideration turns on three things: whether the deal is an asset purchase, a stock purchase, or a tax-free reorganization; whether the seller can defer gain under the installment method or must recognize it up front; and how much of each deferred payment the IRS recharacterizes as ordinary interest income. Get any of those wrong and long-term capital gain can turn into ordinary income, or a multi-year deferral can collapse into a single year’s tax bill.

Open Transactions Are Almost Never Available

Before the structure-specific rules kick in, the IRS asks a threshold question: is the sale “open” or “closed”? Under the open transaction doctrine from Burnet v. Logan, a seller can defer gain until cumulative payments exceed basis, but only when the contingent right has no ascertainable fair market value.¹ The regulations state that “only in rare and extraordinary cases will property be considered to have no fair market value.”²

In practice, almost every earnout deal is treated as closed. The seller must include the present value of the expected earnout in the amount realized on the closing date, even though nothing has been paid yet. That default drives the asset-deal rules below. The stock-deal rules give the seller a way around it through the installment method.

Asset Deals: Both Sides Allocate Under Section 1060

The Seller

Under closed-transaction treatment, the seller’s amount realized is cash at closing, the face amount of any notes, and the fair market value of the contingent payment right. Gain or loss equals that amount minus the adjusted basis of the assets sold.

Character is not uniform across the sale. Both parties allocate the total consideration across seven asset classes using the residual method under Section 1060, filling lower classes before anything flows to goodwill.³⁴ Dollars allocated to inventory or receivables generate ordinary income; dollars allocated to goodwill or other capital assets generate capital gain.

When an earnout later pays more than the value the seller initially reported, the excess is additional sale proceeds, generally capital gain if the underlying assets were capital assets. If it pays less, the seller recognizes a capital loss when the contingent right expires or the final amount is fixed.

The Buyer

The buyer’s basis in the acquired assets equals the total consideration paid. Each earnout payment increases total consideration and forces a reallocation across the seven classes. Because the lower classes are usually filled at closing, incremental earnout dollars flow mostly into intangibles and goodwill.

Goodwill is amortized ratably over 15 years from the date the underlying intangible was originally acquired.⁵ There is no fresh 15-year clock when the earnout is paid; the incremental basis slots into whatever remains of the original schedule. That lag is a real cost of earnout structures for buyers.

The imputed interest slice of each earnout payment (see below) is not added to asset basis. The buyer deducts it as ordinary interest expense.⁶

Stock Deals: The Installment Method Changes Everything for Sellers

Selling Shareholders

Selling shareholders treat contingent payments as additional stock sale proceeds. Held more than a year, the gain is long-term capital gain. The timing question is the important one.

For sales of private company stock with at least one payment after the close of the tax year, the installment method under Section 453 is generally available.⁷ Publicly traded stock is excluded; the full amount is treated as received in the year of sale. In private deals, the installment method lets shareholders defer gain until cash actually arrives, which is a meaningful improvement over the closed-transaction treatment forced on asset sellers.

Mechanics matter. The seller computes a gross profit ratio and applies it to each payment. If the agreement sets a maximum earnout, that cap is the total selling price for the ratio. If there is no stated maximum and no fixed payment period, the regulations require basis recovery in equal annual installments over 15 years from the sale date.⁸ Payments ending before year 15 leave unrecovered basis that is generally deductible as a loss; payments continuing past year 15 are 100% gain.

Buyer Corporation

In a plain stock purchase without a Section 338 election, the buyer has no immediate tax consequence from the earnout. The target’s assets keep their historical basis, its NOLs and other attributes carry forward, and each earnout payment simply increases the buyer’s stock basis in the target.

A Section 338(g) or 338(h)(10) election recharacterizes the stock purchase as an asset purchase for tax purposes, with the target deemed to have sold and repurchased its assets.⁹ Once the election is in place, the contingent consideration follows the asset rules above, including residual allocation and the 15-year goodwill schedule.

Imputed Interest Applies Even If the Contract Is Silent

Whatever the deal documents say, the IRS will carve part of each deferred earnout payment out of “purchase price” and treat it as interest. This is where planning most often breaks down, because the recharacterized portion becomes ordinary income to the seller regardless of how the underlying sale was structured.

Two overlapping provisions do the work. Section 1274 covers debt instruments issued for property when total consideration exceeds $250,000.¹⁰ Section 483 covers deferred payment arrangements that fall outside 1274, including smaller deals.¹¹ Both do the same thing: if the deal does not provide interest at or above the Applicable Federal Rate, the IRS imputes it at the AFR.

The AFR depends on the term. Short-term applies to instruments of three years or less, mid-term to over three but not over nine years, and long-term to over nine years. For March 2026, the annual-compounding AFRs are 3.59% short-term, 3.93% mid-term, and 4.72% long-term.¹²

The imputed portion is ordinary interest income to the seller. The buyer generally deducts the same amount as interest expense. That produces an asymmetry the seller often does not see coming: a payment the parties negotiated as sale proceeds partly converts into ordinary income at the seller’s marginal rate.

Contingent Payment Debt Instruments

When the contingent right qualifies as a contingent payment debt instrument, Treasury Regulation 1.1275-4 layers on the noncontingent bond method.¹³ The buyer sets a comparable yield (no lower than the AFR for the instrument’s maturity), builds a projected payment schedule discounted to the issue price at that yield, and both parties accrue OID annually against the projections even before cash changes hands. When actual payments differ from projections, the year-of-payment adjustment is ordinary: excess is more interest income to the seller, shortfall is an ordinary deduction.

The 3.8% Net Investment Income Tax

Individual sellers over the Section 1411 thresholds pay an additional 3.8% on net investment income, which captures both the capital gain and the imputed interest components of an earnout payment.¹⁴ The thresholds are $250,000 for joint filers, $200,000 for single filers, and $125,000 for married filing separately, and they are not indexed for inflation.

When the Earnout Is Really Compensation

Not every earnout counts as purchase price. If the IRS treats it as compensation for post-closing services, the seller has ordinary income, the buyer has a deduction rather than a basis increase, and employment taxes can attach.

The classic red flag is conditioning the earnout on the seller staying employed. Other factors: whether the payments track equity stake (disproportionate payments look like compensation), whether the seller is already drawing reasonable compensation for the same services, and how both sides report the arrangement. When the earnout traces to a genuine valuation dispute during negotiations, that history supports purchase price treatment.

Section 83 Timing

If the earnout is compensation and subject to a substantial risk of forfeiture, the seller recognizes ordinary income when the risk lapses or the right becomes transferable, whichever comes first, based on the fair market value of the right at that point.¹⁵ A Section 83(b) election pulls income recognition to the grant date at then-current value. If the earnout pays more later, the excess is capital gain; if it pays less, there is no refund for the overpayment.

Section 409A

A compensation-classified earnout is also likely a nonqualified deferred compensation arrangement under Section 409A. Noncompliance triggers immediate income inclusion of all deferred amounts, a 20% additional tax, and an interest charge. Two exits are common. The short-term deferral rule requires payment by March 15 of the year after the risk of forfeiture lapses. A separate safe harbor under Treasury Regulation 1.409A-3(i)(5)(iv)(A) covers earnouts paid on the same schedule and conditions as other shareholders when the earnout period is no more than five years. Outside those exits, the arrangement has to be built around 409A’s specified payment dates and permitted distribution triggers.

Tax-Free Reorganizations: Continuity of Interest Is the Trap

Contingent consideration in a Section 368 reorganization can, if structured wrong, blow up the entire deal’s tax-free status.¹⁶ The continuity of interest doctrine requires target shareholders to receive a substantial portion of consideration in acquirer stock. The IRS has historically treated 40% as the floor; the regulations illustrate 50% as sufficient and 20% as insufficient. If the contingent piece is cash, or if a large contingent stock component leaves too little stock issued at closing, COI can fail and the whole transaction becomes taxable.

The Revenue Procedure 84-42 Safe Harbor

Revenue Procedure 84-42 offers a safe harbor for contingent stock in a tax-free reorganization. To qualify:

All contingent stock must be issued within five years of the reorganization.
At least 50% of the maximum shares of each class that could be issued must go out at closing.
The right to receive additional shares must be nonassignable and not evidenced by a negotiable instrument.
The arrangement can call for additional acquirer stock only, not cash or other property.
The issuance trigger must be objective and outside the shareholders’ control.
There must be a valid business reason for the delay, such as difficulty valuing one of the companies.

When the contingent stock is later issued within the safe harbor, it is treated as additional consideration in the original reorganization, and the seller recognizes no gain or loss on the stock’s principal value. The delay still triggers Section 483 imputed interest, which the seller must report as ordinary income.¹¹ The acquirer generally cannot deduct that imputed interest because it relates to issuing its own stock rather than paying cash.

Reporting Forms

Asset deals require both sides to file Form 8594 to report the purchase price allocation. When a later earnout payment shifts the allocation, the affected party files a supplemental Form 8594 for the year the change is taken into account.¹⁷ A written allocation agreement in the purchase agreement binds both parties for tax purposes under Section 1060 unless it is clearly unreasonable, so what the deal lawyers negotiate on the allocation schedule drives the tax outcome directly.³

Buyers paying $10 or more in imputed interest in a year must issue Form 1099-INT to the seller.¹⁸ Sellers using the installment method file Form 6252 annually to report each payment and the gain recognized, with capital gain flowing to Schedule D.

1
Justia Law. Burnet v. Logan, 283 U.S. 404 (1931)
2
eCFR. 26 CFR 1.1001-1 – Computation of Gain or Loss
3
Office of the Law Revision Counsel. 26 USC 1060 – Special Allocation Rules for Certain Asset Acquisitions
4
eCFR. 26 CFR 1.1060-1 – Special Allocation Rules for Certain Asset Acquisitions
5
Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles
6
Office of the Law Revision Counsel. 26 USC 163 – Interest
7
Office of the Law Revision Counsel. 26 USC 453 – Installment Method
8
eCFR. 26 CFR 15a.453-1 – Installment Method Reporting for Sales of Real Property and Casual Sales of Personal Property
9
Office of the Law Revision Counsel. 26 USC 338 – Certain Stock Purchases Treated as Asset Acquisitions
10
Office of the Law Revision Counsel. 26 USC 1274 – Determination of Issue Price in the Case of Certain Debt Instruments Issued for Property
11
Office of the Law Revision Counsel. 26 USC 483 – Interest on Certain Deferred Payments
12
Internal Revenue Service. Revenue Ruling 2026-6
13
eCFR. 26 CFR 1.1275-4 – Contingent Payment Debt Instruments
14
Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax
15
Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection with Performance of Services
16
Office of the Law Revision Counsel. 26 USC 368 – Definitions Relating to Corporate Reorganizations
17
Internal Revenue Service. Instructions for Form 8594
18
Internal Revenue Service. About Form 1099-INT, Interest Income