Price or paycheck? How the IRS taxes earnout payments when the seller stays on
The installment rules can spread the gain on a contingent price over several years, but in our reading they reach only money paid for the business, and how the contract is drafted can affect how much of each check qualifies.
A founder who sells a company and keeps working for the buyer can receive earnout payments that, as we read the rules, fall into three tax buckets. The first is gain on the sale, which Publication 537 lets a seller report as payments arrive. The second is interest, which the IRS treats as ordinary income. The third is our own reading rather than a category the sources define: money that depends on the founder still showing up for work, which the installment rules, written for sales of property, do not clearly cover. Our view is this: the federal rules for contingent sale prices are detailed, and within their scope they treat the seller fairly well. They only apply to payment for property, though, and the purchase agreement is where a seller decides how much of each check stays inside that scope.
How a contingent price is reported
The IRS treats a deal as an installment sale when at least one payment comes in a tax year after the year of sale. The seller can then report part of the gain as each payment arrives. An earnout falls into what Publication 537 calls a contingent payment sale, meaning the total price can't be fixed by the end of the year of sale. The publication's own example is a business sold for a price that includes a share of its future profits.
Under the Treasury regulation, these sales go on the installment method automatically unless the seller elects out. The regulation then sorts them into three tracks, and each one recovers the seller's basis on a different schedule.
If the agreement caps the payout, the seller has a stated maximum selling price. Under the regulation, that maximum is calculated as if every contingency goes the seller's way and every dollar is paid on the earliest date the contract allows. If there is no cap but the payment window is fixed, basis is spread across the payment years in equal annual increments. A weak year produces no deductible loss unless it is the final payment year or the obligation has become worthless. The unused basis carries forward instead.
If the deal has neither a cap nor an end date, the regulation recovers basis evenly over 15 years. It also warns that these arrangements will be closely scrutinized to see whether the payments are really rent or royalty income rather than proceeds of a sale.
In our reading, the cap and the earnout period are tax terms as well as commercial ones. They set the schedule on which the seller gets basis back, and that decides how much of each early check is taxable gain. A capped deal measures the seller's basis against the most optimistic possible price. By our arithmetic, that leaves less basis to set against each early dollar, so more of it is gain. If targets are missed and the maximum drops, the regulation requires the gross profit ratio to be recalculated for payments made in or after the year of the reduction. Sellers hoping to sidestep all of this by calling the deal an open transaction should know that the regulation allows that only in "rare and extraordinary cases" where the obligation's value cannot reasonably be ascertained.
The interest inside every check
Publication 537 says plainly that interest is ordinary income. It adds that part of a later payment may have to be treated as interest even if the agreement never calls it that.
For contingent deals, the regulation draws a clear line. If interest is stated at or above the prescribed test rate and paid on top of the price, it is kept out of the selling price. If the earnout states no interest, or too little, the regulation applies what it calls the "price-interest recomputation rule." The underlying statute, Section 483, treats as interest the share of total unstated interest "properly allocable to such payment." That wording came from a 1984 amendment that also tied the test to the applicable federal rate under section 1274(d).
The regulation's own worked example shows what this costs. In that example, a seller gets a $10 million profit-linked payment and must report $1,773,000 of it as interest. Of the $8,227,000 of principal left over, $4,704,343 is gain and $3,522,657 is a return of basis. An earlier $6 million payment in the same example included no Section 483 interest at all.
In our reading, a seller with a deferred earnout will face interest either way. The real questions are whether it is visible, whether it was negotiated and how it is priced. An agreement that states adequate interest separately puts the ordinary-income portion in the open. An agreement that says nothing lets the formula take that portion out of what the seller thought was purchase price.
Where the paycheck question begins
Here our sources run out, and we would rather say so than guess. Both Publication 537 and the regulation define the installment method in terms of a sale or disposition of property. None of the material we reviewed gives a test for when an earnout that depends on continued employment stops being purchase price and becomes pay for services.
In our reading, the sources show a willingness to look past labels in at least two places. As noted above, the regulation asks whether open-ended payments are really rent or royalties. It also says a claimed open transaction "will be carefully scrutinized to determine whether a sale in fact has taken place," according to the regulation's text.
In the material we reviewed, Publication 537 addresses compensation directly only in its discussion of partnership interests. There, gain tied to unrealized receivables, a term that includes income from compensation for services, is treated as ordinary income and can't be reported on the installment method.
In our reading, that is a narrow rule for one kind of transaction, not a general ruling on earnouts. Still, it suggests that when income looks like a return for work, the rules may not give it the deferral that comes with selling property. Take an earnout the seller loses by resigning, however well the business does. To us, that looks more like a retention bonus than a price for the company. In our view, a seller should be prepared for the IRS to question that characterization.
Drafting choices that move the number
Several clauses decide how much of an earnout stays inside the installment rules. The first is the shape of the contingency: a cap, a fixed term or neither. Each produces the different basis schedule the regulation sets out.
The second is security. If the buyer funds an irrevocable escrow to pay the remaining installments, the sale can't use the installment method, and the full price counts as received in the year of sale. The exception is an escrow that substantially restricts the seller's right to the money and serves a genuine purpose of the buyer.
The third is borrowing against the earnout. Under the pledge rule, when the selling price is above $150,000, using an installment obligation as collateral for a loan can turn the loan proceeds into a payment for tax purposes.
The fourth is allocation. When the assets sold make up a trade or business, buyer and seller must divide the price using the residual method and report the split on Form 8594. A written allocation agreed by both sides binds them unless the IRS decides the amounts are not appropriate. Gain on inventory and depreciation recapture are taxed in the year of sale, whenever the cash actually arrives.
The fifth is how the deal documents relate to the job. In our reading, a seller who wants the earnout taxed as purchase price should tie it to business results rather than continued employment. The work itself should be paid for under a separate employment agreement at a market rate. The sources do not say this settles the question. But the scrutiny language quoted above suggests the tax treatment depends on what a payment is for, not what the contract calls it.
Last comes timing. A seller who would rather recognize all the gain up front can elect out by the return's due date, including extensions. A seller who filed on time without electing can still elect out by amending the return within 6 months of the original due date. Revoking the election later requires IRS approval. For a cash-method seller with a contingent earnout, the regulation says electing out means reporting the obligation's fair market value in the year of sale. That value can be no lower than the value of the property sold, minus any other payment received.
What to do with this
Before you sign, ask your tax adviser to model the earnout under the track it actually falls into: capped, fixed-term or open-ended. Have them show, year by year, how much of each expected payment is gain, basis and interest. Insist that interest be stated in the contract, so you negotiate the ordinary-income portion instead of having it imputed. Read the forfeiture clause next to your employment agreement. If leaving the company cancels the earnout even when targets are met, assume that money could be taxed as pay and price the deal with that in mind. Agree the asset allocation in writing before closing. And if the escrow, a pledge or the earnout definition changes in late drafts, run the numbers again. In our view, a single sentence of contract language can change the tax on a seven-figure payment.