IRS Publication 537: Installment Method, Recapture, and Form 6252

IRS Publication 537 is the IRS guide to installment sales: sales of property where you receive at least one payment after the tax year of the sale. It explains how to spread the taxable gain across the years you actually collect the money, how to calculate the taxable portion of each payment, and the situations that force you to recognize gain sooner than the payment schedule would suggest. The installment method applies automatically to qualifying sales, so understanding these rules matters even if you never asked for them.¹

What Publication 537 Covers and What It Does Not

An installment sale is any sale of property with at least one payment arriving after the close of the tax year of the sale. Sell rental land in October, take payments over five years, and you have one. The method applies automatically. You do not file an election form to use it.¹

Real property qualifies. So do casual sales of personal property, meaning one-off sales of items you do not sell in the ordinary course of business. A piece of used business equipment, a boat, a patent: all eligible if payments cross the year-end line.

Three categories are excluded outright:

Inventory. Anything held primarily for sale to customers in the ordinary course of business cannot use the installment method.
Publicly traded securities. Stocks and securities traded on an established market are ineligible regardless of payment structure.
Sales at a loss. The method only spreads gains. A loss is reported in full in the year of the sale.¹

How the Installment Method Calculates Your Taxable Gain

Three numbers do all the work: gross profit, contract price, and gross profit percentage.

Gross Profit

Gross profit is the total gain you expect from the sale. Selling price minus adjusted basis. Adjusted basis is your original cost plus capital improvements minus depreciation you claimed. Selling price includes cash, the fair market value of any other property the buyer transfers, and the face amount of the buyer’s note.²

Contract Price

Contract price is the total amount you will actually collect from the buyer. In a clean cash sale with no mortgage, contract price equals selling price. If the buyer assumes an existing mortgage and that mortgage is less than or equal to your basis, the mortgage reduces the contract price. If the mortgage exceeds your basis, the excess is treated as a payment received in the year of sale, and that same excess is added back to the contract price. Sellers with thin equity feel this rule first.²

Gross Profit Percentage

Divide gross profit by contract price. That percentage stays fixed for the life of the note and determines how much of each principal payment is taxable. Gross profit of $50,000 on a $100,000 contract price gives a 50% gross profit percentage. Every $10,000 principal payment produces $5,000 of gain and $5,000 of tax-free basis recovery.²

Interest the buyer pays you on the note is separate. It does not run through the gross profit percentage. It is ordinary income in the year you receive it.¹

Depreciation Recapture Is Taxed Up Front

If you claimed depreciation on the property, the installment method will not defer the gain tied to those deductions. All depreciation recapture is recognized as ordinary income in the year of the sale, reported on Form 4797, even if you receive no principal payments that year.³

This catches sellers of business equipment and rental property off guard. Only the gain above the recapture amount qualifies for installment treatment. Once you have paid tax on the recapture, that amount effectively increases your basis for the remaining calculation, which lowers the gross profit percentage applied to future payments.

Special Situations That Change the Math

Sales to Related Parties

The IRS watches installment sales between related parties because of an obvious move: sell to a family member on installments, family member sells for cash, the family holds the money while your gain sits deferred.

The rule: if the related buyer disposes of the property within two years of the original sale, you must recognize the remaining deferred gain in the year of that second sale. The amount treated as received is capped at the lesser of the total realized on the second sale or the remaining contract price from the first, minus what you have already collected or previously recognized.³

The two-year clock pauses if the related buyer hedges the risk of loss through a put option, short sale, or similar arrangement. Three events do not trigger acceleration: involuntary conversion (destruction by natural disaster, for example), death of either party, and a corporation reacquiring its own stock.³

“Related person” covers family members under the attribution rules, corporations or partnerships you own more than 50% of, and other entities linked to you through constructive ownership.³

Contingent Payment Sales

When the total price cannot be nailed down at closing (a base price plus a percentage of future revenue, an earn-out tied to performance), you cannot calculate a gross profit percentage in the normal way. Pub 537 handles these in three tiers: if the agreement states a maximum price, use it for the percentage and adjust retroactively if actual payments come in lower; if there is no maximum but a fixed payment period, recover basis ratably over that period; if there is neither a maximum nor a fixed period, recover basis in equal annual increments over 15 years, with unrecovered basis carrying forward.⁴

Like-Kind Exchanges Involving a Note

If a Section 1031 exchange brings you both replacement property and a promissory note from the buyer, the note is boot and taxable up to the gain. Publication 537 adjusts the installment calculation three ways: contract price is reduced by the fair market value of the like-kind property received, gross profit is reduced by the gain you can postpone under the exchange rules, and the like-kind property itself is not treated as a payment on the note.²

Traps That Trigger Immediate Gain

Pledging the Note as Collateral

Using an installment note as collateral for a loan is treated by the IRS as receiving a payment on the note. You owe tax as if the buyer had paid you directly. The rationale: pledging gets you cash now while you still technically hold the note, and the economic result matches a payment. The amount treated as received cannot exceed the remaining contract price minus payments already collected. Later actual payments from the buyer are then tax-free until they catch up to the gain you already recognized from the pledge.⁵

Inadequate Stated Interest

An installment note must carry adequate stated interest. If it does not, the IRS will treat part of each principal payment as interest, shifting dollars from capital gain into ordinary income. This shows up most often in family sales where the parties set a below-market rate or charge nothing at all.

The benchmark is the applicable federal rate (AFR), published monthly, with different rates for short-term, mid-term, and long-term notes. If your stated rate falls below the AFR, the IRS recalculates the note’s issue price using the AFR as the discount rate, and the shortfall is treated as unstated interest.⁶

The Interest Charge on Large Deferrals

The installment method defers tax, but very large deferrals come with a cost. Under Section 453A, if you hold installment obligations with a total face amount exceeding $5 million that arose during the same tax year, the IRS imposes an annual interest charge on your deferred tax liability. The rule only applies if the property’s sales price also exceeded $150,000.⁵

The charge equals the deferred tax liability times the IRS underpayment rate in effect for the month your tax year ends. Deferred tax liability is the unrecognized gain multiplied by the maximum applicable tax rate, using the maximum capital gains rate for long-term gain. Only the portion of obligations above $5 million counts, so a seller with $7 million outstanding pays the charge only on the deferred tax attributable to the $2 million excess.⁵

What Happens If the Buyer Defaults or You Die

Repossessing Real Property

When a buyer defaults on an installment obligation secured by real property, Section 1038 governs the tax result. Repossession gain equals the cash and other property you received before the repossession, minus the gain you already reported. You are only taxed on collected payments you had not yet reported.⁷

The gain is also capped. It cannot exceed the original total gain on the sale, reduced by gain already reported and by any money or property you paid to reacquire the property. Section 1038 applies only if you are the original seller, the repossession enforces your security interest, and you paid no additional consideration to get the property back except as the original contract provided or upon buyer default.⁷

Death of the Seller

If you die holding an installment obligation, the remaining gain does not disappear. The obligation passes to your estate or heirs as income in respect of a decedent. Whoever inherits the note reports the same proportion of each payment as gain that you would have reported.⁸

Nothing is reported on the decedent’s final return simply because the note transmitted at death. The catch: an installment obligation does not receive a stepped-up basis at death, unlike most inherited assets.⁹

If the obligation is canceled at death (a common estate-planning move when the buyer is family), the cancellation is a taxable transfer by the estate. Where the decedent and buyer were related, the note’s fair market value is treated as no less than its face amount.⁸

Choosing to Skip the Installment Method

The installment method applies automatically, but you can elect out and report the full gain in the year of sale. You elect by reporting the full gain on that year’s return, using Schedule D and Form 8949 for capital assets or Form 4797 for business property. The election is due by the return’s due date, including extensions.³

Reversing the election requires IRS consent, and the IRS will deny consent if any purpose is tax avoidance or if the tax year of any payment has already closed.²

Why elect out? Usually because you have capital losses in the year of the sale that can absorb the gain, or because you expect tax rates to be higher when future payments arrive.

Reporting on Form 6252

Form 6252, Installment Sale Income, is where every installment sale is reported. File it in the year of the sale and again in every year you receive a payment on the note.¹⁰

The form asks for selling price, adjusted basis, and any debt the buyer assumed, then walks through gross profit, contract price, and gross profit percentage. You enter the total principal payments received during the year, apply the percentage, and arrive at your taxable gain.

Where the gain goes depends on the property. Gain on a capital asset like investment real estate flows from Form 6252 to Schedule D. Gain on a business asset like equipment goes first to Form 4797, which handles the netting of Section 1231 gains and losses. A net Section 1231 gain is treated as long-term capital gain; a net loss is deducted as ordinary. The result then carries to Form 1040.¹

Skipping Form 6252 in a year you received a payment does not make the income vanish. The IRS can assess tax, interest, and penalties on unreported installment income. If you hold notes from more than one sale, file a separate Form 6252 for each.

1
Internal Revenue Service. Topic No. 705 – Installment Sales
2
Internal Revenue Service. Publication 537 – Installment Sales
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Office of the Law Revision Counsel. 26 USC 453 – Installment Method
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eCFR. 26 CFR 15a.453-1 – Installment Method Reporting for Sales of Real Property and Casual Sales of Personal Property
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Office of the Law Revision Counsel. 26 USC 453A – Special Rules for Nondealers
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Office of the Law Revision Counsel. 26 USC 1274 – Determination of Issue Price in the Case of Certain Debt Instruments Issued for Property
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Office of the Law Revision Counsel. 26 USC 1038 – Certain Reacquisitions of Real Property
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Office of the Law Revision Counsel. 26 USC 691 – Recipients of Income in Respect of Decedents
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eCFR. 26 CFR 1.691(a)-5 – Installment Obligations Acquired From Decedent
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Internal Revenue Service. About Form 6252 – Installment Sale Income