How Do Capital Gains Work on Owner Financed Property?

Capital gains on owner-financed property are spread across the years you collect payments rather than taxed all at once. You calculate a gross profit percentage in the year of sale, and that same percentage applies to every principal dollar the buyer pays you, for as long as the note runs. Interest is taxed separately as ordinary income. Depreciation recapture and any gain treated as ordinary income still hit in the sale year, but the rest of the capital gain rides with the payments.

When the Installment Method Applies

A sale qualifies for installment reporting when you receive at least one payment after the close of the tax year of the sale.¹ Close in October, take payments starting in November, and the January payment alone is enough to trigger installment treatment.

The method applies automatically. You do not elect in. You can elect out by reporting the full gain on the return for the year of sale, but the election has to be made by the due date of that return (including extensions), and revoking it later requires IRS consent.¹

Two situations are off the table regardless of how payments are structured. A sale at a loss must be reported entirely in the year of sale. And property held primarily for resale to customers, along with inventory, cannot use the installment method.²

The Three Numbers You Need

Every annual calculation traces back to three figures set in the year of sale.

Selling price is the full amount the buyer is paying: the down payment, the face value of the note, and any existing mortgage the buyer assumes.

Adjusted basis is what the property is worth to you for tax purposes. Start with what you paid, add capital improvements like a new roof or an addition, and subtract any depreciation you claimed.

Selling expenses are transaction costs such as commissions, attorney fees, and title insurance.

Gross profit is the selling price minus your adjusted basis minus your selling expenses. That is the total capital gain you will eventually recognize across the life of the note.

Calculating the Gross Profit Percentage

Divide gross profit by the contract price. That ratio is the fraction of each principal payment that counts as taxable gain, and it stays fixed for the life of the note.

When no existing mortgage passes to the buyer, the contract price equals the selling price. If the buyer assumes a mortgage that is less than your adjusted basis, subtract the mortgage from the selling price to get the contract price. The assumed debt is treated as basis recovery rather than a payment to you.³

A Worked Example

You sell land you bought for $180,000. The buyer pays $50,000 down, and you carry a $250,000 note at 6% over 15 years. Selling price is $300,000. Selling expenses are $10,000. No existing mortgage and no depreciation.

Adjusted basis: $180,000
Gross profit: $300,000 − $180,000 − $10,000 = $110,000
Contract price: $300,000
Gross profit percentage: $110,000 ÷ $300,000 = 36.67%

In the sale year, the $50,000 down payment produces $50,000 × 36.67% = $18,335 in capital gain. The remaining $31,665 is tax-free return of basis. In year two, if the buyer pays $20,000 in principal (interest is separate), you report $20,000 × 36.67% = $7,334 in capital gain. Same formula every year. When the note is paid off, you will have recognized exactly $110,000 in gain.

Interest received is reported separately as ordinary income and has nothing to do with the gross profit percentage.

Depreciation Recapture Comes Out First

If you claimed depreciation on the property, some of your gain is reclassified as ordinary income and taxed entirely in the sale year. It cannot be deferred through installment reporting.

For personal property and certain real property improvements, prior depreciation is recaptured in full as ordinary income at sale.⁴ For depreciable real estate like buildings, the parallel rule recaptures “additional” depreciation (amounts above straight-line) as ordinary income.⁵ The recapture amount goes on Form 4797 in the year of sale. Only the remaining gain rides with the installments.

If the Property Was Your Home

Sell your principal residence and meet the ownership and use tests, and you can exclude up to $250,000 of gain, or $500,000 filing jointly, before applying the installment method.⁶ The excluded gain is subtracted from gross profit before you calculate the percentage.³

Take the earlier example, but assume the property was your home. Gross profit before exclusion is $110,000. A single filer excludes the full $110,000 (it’s below the $250,000 cap), the gross profit percentage drops to zero, and no principal payment is taxable.

Where the exclusion earns its keep is on larger gains. If gross profit is $350,000 and you exclude $250,000, only $100,000 feeds the percentage. On a $400,000 contract price, that’s a 25% rate on each principal payment instead of 87.5%. Report the sale on Form 6252 with the reduced gross profit.⁷

Charge Enough Interest

The IRS requires an owner-financed note to carry at least the Applicable Federal Rate for the month of sale. If the stated rate falls short and payments are due more than a year after the sale, a portion of each principal payment is recharacterized as interest.⁸⁹ Dollars you counted on as capital gain become ordinary interest income. Setting the note at or above the AFR for the month of sale avoids the problem.

Reporting the Gain Each Year

Form 6252, Installment Sale Income, is the form you file every year you receive a payment. You attach it to Form 1040. The first year, it walks you through selling price, adjusted basis, contract price, and gross profit percentage. In later years, you plug in the principal received and multiply by the percentage you already set.¹⁰

The gain from Form 6252 flows to Schedule D for capital assets like a personal residence or investment land, or to Form 4797 for trade or business property held more than a year. For capital assets, the amount from line 26 of Form 6252 becomes a short-term or long-term gain on Schedule D.³ Form 8949 is not used unless you elect out of the installment method.

Interest is reported separately on Schedule B as ordinary income.

The 3.8% Net Investment Income Tax

Both the capital gain and the interest from an installment sale count as net investment income for the 3.8% surtax. It applies to the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds $200,000 single, $250,000 married filing jointly, or $125,000 married filing separately.¹¹

Those thresholds are not indexed for inflation. Spreading a big gain across installment years can keep some years below the threshold, though the interest you collect annually still counts toward MAGI. If you owe the tax, report it on Form 8960.

Medicare Premium Surcharges

Sellers at or near 65 should factor in IRMAA, the Income-Related Monthly Adjustment Amount that raises Medicare Part B and Part D premiums at higher incomes. Surcharges are based on MAGI from two years back, so 2026 income affects 2028 premiums.

For 2026, surcharges for single filers begin when MAGI exceeds $109,000, or $218,000 for joint filers. At the top bracket, MAGI of $500,000 or more ($750,000 joint) adds $487 per month to Part B and another $91 per month for Part D.¹² A $400,000 gain taken in one year could push a retiree into the top bracket, adding roughly $6,900 in annual surcharges. Spread the same gain over ten years and each year may stay below the first surcharge threshold entirely.

Sales to Related Parties

Selling to a family member, a controlled entity, or another related person on installment terms brings extra rules. If the related buyer resells the property within two years and before you have been fully paid, the amount they realize on the resale is treated as if you received it at that moment, and your deferred gain accelerates.¹

A stricter rule covers depreciable property sold to a related party: the installment method is disallowed and the full gain is recognized in the year of sale, unless you can show the IRS that tax avoidance was not a principal purpose of the sale.¹

What Ends the Deferral Early

Selling the Note

If you sell the installment obligation, you calculate the note’s adjusted basis (face value of the remaining obligation minus the deferred gain still embedded in it), and the difference between what you receive and that basis is your recognized gain or loss.¹³ Secondary-market buyers typically pay a discount, so you may collect less than face value while still owing tax on the deferred gain.

Buyer Default and Repossession

When the buyer stops paying and you take the property back, the gain on repossession equals the cash and other property you received from the buyer before the default, minus the gain already reported. A ceiling applies: recognized gain on repossession cannot exceed the original gross profit, reduced by prior recognized gain and by repossession costs like legal and filing fees.¹⁴ You never pay tax on more profit than you actually pocketed.

Death of the Seller

An installment note does not receive a stepped-up basis at the seller’s death. The remaining gain is treated as income in respect of a decedent. The heir (or the estate) reports each payment using the same gross profit percentage the original seller established, and the character of the income carries over: capital gain stays capital gain, interest stays ordinary.¹⁵ The transfer at death itself does not trigger gain.¹³ Heirs pick up a stream of partially taxable payments rather than cash with no embedded tax, so estate planning around an owner-financed note should account for the built-in income tax on future collections.

1
Office of the Law Revision Counsel. 26 USC 453 – Installment Method
2
LII / Legal Information Institute. Installment Sale
3
Internal Revenue Service. Publication 537 (2025), Installment Sales
4
Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property
5
Office of the Law Revision Counsel. 26 USC 1250 – Gain From Dispositions of Certain Depreciable Realty
6
Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
7
Internal Revenue Service. Selling Your Home
8
Office of the Law Revision Counsel. 26 USC 483 – Interest on Certain Deferred Payments
9
eCFR. 26 CFR 1.483-1 – Interest on Certain Deferred Payments
10
Internal Revenue Service. About Form 6252, Installment Sale Income
11
Internal Revenue Service. Net Investment Income Tax
12
CMS. 2026 Medicare Parts A and B Premiums and Deductibles
13
GovInfo. 26 USC 453B – Gain or Loss on Disposition of Installment Obligations
14
Office of the Law Revision Counsel. 26 USC 1038 – Certain Reacquisitions of Real Property
15
Office of the Law Revision Counsel. 26 USC 691 – Recipients of Income in Respect of Decedents