What Is a 453 Exchange? Installment Sale Rules and Exclusions

A 453 installment sale lets you spread the taxable gain from a property sale across the years you actually receive payments, rather than owing tax on the full profit in the year of closing. The rule sits in Section 453 of the Internal Revenue Code, and it applies automatically to any sale where at least one payment arrives after the close of the tax year in which the sale takes place.¹ You don’t have to ask for it. You have to opt out if you don’t want it.

The tradeoff is that several kinds of property and several kinds of gain are carved out of the deferral, and a handful of later actions, like using the note as loan collateral, can pull the deferred gain back into income all at once. The rules below are what shapes the size of the benefit in practice.

What Qualifies as an Installment Sale

The threshold test is short: a sale of property in which you receive at least one payment after the end of the tax year of the sale. Even a lump-sum payment that lands the following January qualifies, because it was received after the close of the sale year.¹

Installment treatment is automatic. To opt out, you report the entire gain in the year of sale on Form 4797 (business property) or Schedule D and Form 8949 (capital assets) instead of filing Form 6252.² The election out is essentially permanent; the IRS rarely grants consent to revoke it.¹

One boundary worth stating up front: Section 453 is a gain deferral tool only. If you sell at a loss, the loss is recognized in the year of sale. You cannot spread it out over the payment period.³

What Counts as a Payment

A payment is cash, the fair market value of other property, or any evidence of indebtedness from the buyer that is payable on demand or readily tradable. A standard installment note from the buyer is not itself a payment; you’re taxed on its principal only as the buyer pays it down.¹

The buyer’s assumption of your existing mortgage is handled separately. If the assumed mortgage is equal to or less than your adjusted basis, it isn’t treated as a payment. If the mortgage exceeds your basis, the excess counts as a payment received in the year of sale, which pulls a portion of your gain forward.⁴

How You Calculate the Taxable Portion Each Year

The mechanic is a single ratio, applied to every principal payment for the life of the note. Three numbers set it: gross profit, contract price, and the payments actually received.

Gross profit is the total gain you’ll ultimately report: selling price minus your adjusted basis (original cost plus improvements, less depreciation taken) minus selling expenses.³

Contract price is the total the buyer will actually pay you, not counting interest. In a clean sale with no mortgage assumption, contract price equals selling price. If the buyer assumes your mortgage, you reduce the selling price by the assumed mortgage, but only to the extent that mortgage doesn’t exceed your basis.⁴

Gross profit percentage is gross profit divided by contract price. It stays constant. Each year, multiply the principal you actually received by that percentage; the result is your installment sale income for the year. The rest of each payment is a tax-free return of basis.³

A worked example from the Treasury regulations makes it concrete. You sell land for $160,000. The buyer assumes your $60,000 mortgage and pays the remaining $100,000 in ten annual installments. Your basis is $90,000. Because the $60,000 mortgage doesn’t exceed your $90,000 basis, contract price is $100,000 ($160,000 minus the assumed mortgage). Gross profit is $70,000 ($160,000 minus $90,000). The gross profit percentage is 70%, so each $10,000 annual payment produces $7,000 of taxable gain.⁴

The gain keeps its original character. If you held the property more than one year, it’s long-term capital gain, taxed at 0%, 15%, or 20% depending on your total taxable income. Property held one year or less produces short-term gain taxed at ordinary rates.⁵

You report the income on Form 6252 in the year of sale and in every subsequent year that payments come in. If the buyer is a related party, Part III of the form is required for the year of sale and the two years after it.³

Interest You Must Charge on the Note

Every installment sale has to carry a minimum rate of interest on the deferred balance. If your contract charges less than the applicable federal rate (AFR), the IRS recharacterizes part of each principal payment as interest. The effect: stated selling price drops, ordinary interest income rises. Your capital gain shrinks, but the shortfall becomes interest taxed at ordinary rates.³

The AFR changes monthly and varies by term (short, mid, long). If your contract’s stated rate meets or exceeds the AFR at closing, no recharacterization applies. Interest you receive, whether stated or imputed, goes on Schedule B, not on Form 6252.²

What You Cannot Defer

Several categories are excluded from installment treatment outright, and one common category of gain gets pulled forward even when the rest qualifies.

Dealer Property and Inventory

Property you hold primarily for sale to customers in the ordinary course of business can’t use the installment method. A real estate developer selling subdivision lots, for instance, reports the full gain in the year of each sale as ordinary income.¹

Publicly Traded Securities

Stock or securities traded on an established securities market are excluded. All payments to be received are treated as received in the year of sale. Revolving credit plans are covered by the same rule.¹

Depreciation Recapture

This is the trap for sellers of business property and rental real estate. Any gain attributable to prior depreciation, the recapture amount, must be recognized as ordinary income in the year of sale, even if you receive no principal that year. The installment method applies only to the gain above the recapture.¹

Recapture is calculated as if you’d received the entire sales price in year one. For equipment and personal property under Section 1245, that usually means all accumulated depreciation comes back as ordinary income at closing. Section 1250 real property produces a smaller recapture figure, but it still hits in year one. Your adjusted basis is then increased by the recapture amount when you compute the gross profit percentage on what remains.¹

Selling to a Related Party

Selling on installment terms to a family member or controlled entity brings a second-disposition rule. If the related buyer resells the property within two years of the first sale, the amount they receive on the resale is treated as a payment to you, and your deferred gain accelerates into the year of the resale.¹

“Related person” tracks the constructive ownership rules and includes family members, entities you control, and other relationships listed in the code. For marketable securities sold to a related party, there is no two-year window; the acceleration applies whenever the second sale happens.¹

Related-party sales require Part III of Form 6252 for the year of sale and the two following years, so the IRS can track whether a second disposition happens.³

The Interest Charge on Large Installment Sales

Section 453A layers an interest charge onto the deferred tax when your installment portfolio is large. Two conditions have to be met together: the sales price of the property must exceed $150,000, and the total face amount of your installment obligations arising during the tax year and still outstanding at year-end must exceed $5 million.⁶

A single $4 million sale, standing alone, doesn’t trigger the charge. Two $3 million sales in the same year, both outstanding at year-end, do. The interest is computed on the tax that would have been due on the deferred gain, at the IRS’s quarterly underpayment rate. For high-value real estate and business sales, this charge can eat into the cash-flow benefit of the deferral.⁶

Pledging or Transferring the Note

Two moves after closing can collapse the deferral.

Pledging the Note as Loan Collateral

If you borrow against the installment obligation, the net loan proceeds are treated as a payment received on the note. The deemed payment lands as of the later of the date the note becomes collateral or the date you receive the loan proceeds, and it produces taxable gain at your gross profit percentage. This rule sits in Section 453A and is aimed at sellers who otherwise would get immediate cash while keeping the deferral intact.⁶

Selling, Gifting, or Otherwise Disposing of the Note

If you sell the note, your gain or loss is the difference between the amount you receive and the note’s basis. The note’s basis is its face value minus the income you would have reported had it been paid in full. On a note with a $100,000 face value and a 70% gross profit ratio, the basis is $30,000.⁷

A gift or other non-sale transfer uses the same calculation but substitutes the note’s fair market value for the amount realized. Either way, the full deferred gain comes into income at once. Transfers between spouses, or to a former spouse incident to divorce, are the exception: no gain is recognized, and the receiving spouse continues reporting installment income on the same terms.⁷

If the Seller Dies Before the Note Is Paid

Death does not trigger the disposition rules. The transfer of the note at death is excepted from Section 453B, so no gain is recognized on the decedent’s final return simply because the obligation changes hands.⁷

What doesn’t happen at death is a basis step-up. The installment obligation is income in respect of a decedent. Whoever inherits the note, whether the estate or a named beneficiary, keeps reporting the same taxable proportion of each payment the decedent would have reported. That’s a meaningful contrast with inherited stock or real estate, where built-in gain typically disappears at death.

Combining an Installment Sale With a Section 1031 Exchange

When the buyer pays partly in cash and partly with a note, sellers sometimes pair Section 453 with a Section 1031 like-kind exchange. In a common structure, cash proceeds are rolled through a qualified intermediary into replacement property and deferred under Section 1031, while the seller takes the note directly and treats it as boot, taxed under the installment method as payments come in. The reinvested cash gets 1031 deferral; the note gets 453 deferral.

An alternative has the note made payable to the qualified intermediary at closing. If the intermediary collects the payments and uses them to acquire replacement property inside the 180-day exchange window, the whole gain can potentially fall under Section 1031, with no installment sale income at all. The mechanics are exacting. Who holds the note during the exchange window, and in what order things happen, drive whether the exchange holds up, and a misstep can defeat the 1031 treatment entirely.

1
Office of the Law Revision Counsel. 26 US Code 453 – Installment Method
2
Internal Revenue Service. Topic No. 705, Installment Sales
3
Internal Revenue Service. Publication 537, Installment Sales
4
eCFR. 26 CFR 15a.453-1
5
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
6
Office of the Law Revision Counsel. 26 US Code 453A – Special Rules for Nondealers
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Office of the Law Revision Counsel. 26 US Code 453B – Gain or Loss on Disposition of Installment Obligations