IRS Publication 537: Installment Sale Rules, Form 6252, and Recapture

IRS Publication 537 explains the installment sales rules: when you sell property and receive at least one payment after the tax year of the sale, you generally report the gain as you collect it rather than all at once. A fixed percentage of each principal payment counts as taxable gain, the rest is a tax-free return of your investment, and interest the buyer pays you is handled separately as ordinary income. The method applies automatically to qualifying sales, so there is no election form to file for the deferral itself.

What Qualifies as an Installment Sale

Any sale of property where at least one payment arrives after the end of the tax year of the sale is an installment sale. Sell a rental house in October with payments spread over the next five years, and you have one. The installment method applies automatically; you do not request it.¹

Eligible transactions include sales of real property and casual sales of personal property, meaning one-off sales of things you do not sell as part of your regular business. A piece of business equipment, a patent, or a boat all qualify when payment stretches past the year of sale.

Three categories are excluded:

Inventory held for sale to customers in the ordinary course of business.
Publicly traded stocks and securities, regardless of how payments are structured.
Sales that produce a loss. The installment method only applies to gains; a loss is reported in full in the year of sale.¹

How to Calculate the Taxable Portion of Each Payment

Three numbers run the whole calculation: gross profit, contract price, and the gross profit percentage.

Gross Profit

Gross profit is the total gain you expect to collect over the life of the installment agreement: selling price minus adjusted basis. Adjusted basis is your original cost plus capital improvements minus depreciation claimed. Selling price includes cash, the fair market value of any other property the buyer gives you, and the face amount of the buyer’s note.²

Contract Price

Contract price is the money you will actually collect from the buyer over time. In a straight cash-and-note sale, it equals the selling price. If the buyer assumes an existing mortgage, the calculation shifts. A mortgage balance less than or equal to your adjusted basis simply reduces the contract price. If the mortgage exceeds your basis, the excess is treated as a payment received in the year of sale and is also added to the contract price. Sellers who carry little equity relative to the mortgage can find a chunk of their gain accelerated into the sale year this way.²

Gross Profit Percentage

Divide gross profit by contract price. The result is your gross profit percentage, and it stays fixed for the life of the agreement. Each principal payment is multiplied by that percentage to find the taxable gain for the year. If your gross profit is $50,000 and the contract price is $100,000, the percentage is 50%. A $10,000 principal payment produces $5,000 of taxable gain and $5,000 of tax-free basis recovery.²

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

Depreciation Recapture You Cannot Defer

If you claimed depreciation on the property, the installment method does not let you spread the recapture gain. All depreciation recapture must be recognized as ordinary income in the year of sale, even if you receive no principal payments that year.³

This catches sellers off guard with equipment sales and heavily depreciated rental property. The recapture portion is reported on Form 4797 at ordinary rates in year one. For purposes of the ongoing installment calculation, the recapture amount effectively increases your adjusted basis, which lowers the gross profit percentage applied to future payments. You are not taxed twice; you are simply paying the recapture tax up front and deferring only the remaining gain.

Minimum Interest the Note Must Carry

An installment note must carry adequate stated interest. If it does not, the IRS recharacterizes part of each principal payment as interest, shifting dollars from the capital gain column into ordinary income. This issue surfaces often in family sales where the parties set a below-market rate or no rate at all.

The benchmark is the applicable federal rate (AFR), published monthly. Short-term AFRs apply to notes of three years or less, mid-term to notes between three and nine years, and long-term to notes over nine years. If the note’s stated rate falls below the AFR, the IRS discounts the note using the AFR to recalculate issue price, and the gap between the face amount and that recalculated price is treated as unstated interest.⁴

Check the current month’s AFR before locking in the interest rate on a seller-financed deal.

Events That Accelerate the Deferred Gain

The deferral is not bulletproof. Three situations can pull the remaining gain forward.

Related-Party Resale Within Two Years

Sell to a family member who then flips the property for cash, and the IRS treats the second sale’s proceeds as if you had received them. If the related buyer disposes of the property within two years of the original sale, you 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 sale, reduced by payments you have already received or already recognized.³

The two-year clock pauses if the related buyer hedges the risk of loss during that period through a put option, short sale, or similar arrangement. The clock resumes when the hedge is removed.³

Three events do not trigger acceleration: an involuntary conversion of the property, the death of either the original seller or the related buyer, and the reacquisition of stock by the issuing corporation.³

“Related person” covers family members under the attribution rules (spouses, children, grandchildren, parents, siblings), corporations or partnerships where you own more than 50% of the stock or capital interest, and other entities connected to you through constructive ownership.³

Pledging the Note as Loan Collateral

Using the installment note as collateral for a loan is treated as receiving a payment on the note. You owe tax on the gain as if the buyer had paid you directly. The amount treated as received cannot exceed the remaining contract price minus payments already collected. After the pledge triggers gain, later actual payments from the buyer are tax-free until they catch up to what you already recognized.⁵

Large Installment Obligations Carry an Interest Charge

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 the deferred tax. The property must also have a sales price over $150,000 for the rule to apply.⁵

The charge equals the deferred tax liability times the IRS underpayment rate in effect for the month the tax year ends. The deferred tax liability is the unrecognized gain times the maximum applicable rate (the long-term capital gains rate for capital gain property). Only the portion of obligations above $5 million is subject to the charge. A seller with $7 million outstanding pays interest only on the deferred tax attributable to the $2 million excess.⁵

Electing Out of the Installment Method

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

The decision is close to permanent. Revoking the election requires IRS consent, and the IRS will deny the request if one purpose is tax avoidance or if the tax year any payment was received has already closed.²

The usual reason to elect out is having capital losses available in the year of sale that can offset the gain. Taking the whole gain now and pairing it with existing losses can beat spreading the gain over years when no offsetting losses exist. Expectations of higher future tax rates can also tip the decision.

Reporting on Form 6252

Form 6252 (Installment Sale Income) reports every installment sale. File it in the year of the sale and again in every subsequent year you receive a payment on the note.⁶

On the form, enter selling price, adjusted basis, and any debt the buyer assumed. The form walks through gross profit, contract price, and gross profit percentage. Enter the principal payments received during the year, apply the percentage, and the result is the taxable gain for the year.

Where that gain lands on your return depends on the property. Gain from a capital asset flows from Form 6252 to Schedule D. Gain from a business asset goes first to Form 4797, which nets 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 final figure from Form 4797 carries to Form 1040.¹

Skipping Form 6252 in a year you received a payment does not make the income disappear. The IRS can assess tax, interest, and penalties. If you hold multiple installment obligations from different sales, file a separate Form 6252 for each one.

If the Seller Dies or the Buyer Defaults

Two later events are worth knowing before they happen.

If you die holding an installment obligation, the remaining gain does not disappear. The obligation is income in respect of a decedent. Your estate or whoever inherits the note reports the same proportion of each payment as gain that you would have reported. No gain is triggered on the final return simply because the note transferred at death, and the note does not receive a stepped-up basis the way most inherited assets do.⁷⁸ If the obligation is canceled at death (for example, a parent forgives the balance in a will), the cancellation is treated as a taxable transfer by the estate, and when the decedent and buyer were related, the obligation’s fair market value cannot be treated as less than its face amount.

If the buyer defaults on a note secured by real property and you take the property back, Section 1038 limits your gain to the payments you received before the repossession minus the gain you already reported in prior years. The gain is also capped at the original total gain reduced by amounts already reported and by any money or property you paid to reacquire. Section 1038 requires that you be the original seller, that the repossession enforce your security interest, and that you not pay additional consideration beyond what the original contract allowed or what the default made necessary.⁹

1
Internal Revenue Service. Topic No. 705 – Installment Sales
2
Internal Revenue Service. Publication 537 – Installment Sales
3
Office of the Law Revision Counsel. 26 USC 453 – Installment Method
4
Office of the Law Revision Counsel. 26 USC 1274 – Determination of Issue Price in the Case of Certain Debt Instruments Issued for Property
5
Office of the Law Revision Counsel. 26 USC 453A – Special Rules for Nondealers
6
Internal Revenue Service. About Form 6252 – Installment Sale Income
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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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Office of the Law Revision Counsel. 26 USC 1038 – Certain Reacquisitions of Real Property