Section 453B: Gain or Loss on Installment Obligations

When you dispose of an installment obligation, Section 453B forces all the remaining deferred gain into that year, taxed as the difference between what you get for the note and your adjusted basis in it.¹ The gain or loss on disposition of an installment obligation keeps the same character as the original sale, so long-term capital gain stays long-term, and depreciation recapture stays ordinary. A short list of transfers, principally at death, in divorce, and into certain controlled entities, lets the new holder step in and keep deferring.

What Counts as a Disposition

Section 453B reaches almost any event that ends your right to collect on the note. Selling it, exchanging it, distributing it, gifting it, canceling it, or otherwise giving up the right to future payments all qualify.¹

The clearest case is selling the buyer’s note, often to a bank at a discount. You take cash and recognize gain or loss against your adjusted basis in the obligation.

Gifting the note produces the same acceleration without any cash coming in. The IRS treats the gift as a disposition at the obligation’s fair market value, so you owe tax on the FMV minus your adjusted basis.² Donating the note to charity may generate a deduction, but the deferred gain still lands on your return that year.

Moving the obligation into a non-grantor irrevocable trust triggers acceleration too, because the trust is a separate taxpayer and the transfer counts as a disposition at fair market value. A revocable grantor trust is different: because you’re still treated as the owner for income tax purposes, moving the note in is generally not a disposition.

Pledging the note as collateral can also count. Section 453A treats the loan proceeds as a payment on the note to the extent of the net secured borrowing, but only for obligations from sales above $150,000, and it excludes personal-use and farm property.³

How to Calculate the Gain or Loss

The formula is one line: amount realized minus adjusted basis in the obligation. The work is in figuring out each piece.

Your adjusted basis in the note equals the unpaid balance minus the deferred gain still inside it. A shorter way to get there: multiply the unpaid balance by the cost-recovery portion of each payment, which is one minus your gross profit percentage.² Gross profit percentage is the gross profit from the original sale divided by the total contract price. If you sold property for $500,000 with $200,000 of gross profit, your gross profit percentage is 40%, and 60% of any unpaid principal is your basis in the obligation.

How you determine the amount realized depends on how you dispose of the note:

Sale or exchange: whatever you receive, cash or property.
Gift, distribution, or transfer to a non-grantor trust: the fair market value of the obligation at the time of the transfer.¹
Cancellation between unrelated parties: the FMV of the obligation at cancellation.
Cancellation between related parties: the FMV, but not less than the full face amount of the note.¹

A loss is possible. If the buyer’s credit has deteriorated and you sell the note at a steep discount, the loss shows up in the year of the disposition.

A partial settlement, where you accept a reduced payoff and forgive the rest, is also a disposition. Gain or loss equals what you actually receive minus your adjusted basis in the obligation.²

Character of the Accelerated Gain

The gain keeps the character it would have had if payments had come in on schedule. A note from the sale of a long-term capital asset produces long-term capital gain on acceleration. For 2026, long-term capital gains are taxed at 0%, 15%, or 20% depending on taxable income, with the 20% rate applying to single filers above $545,500 and joint filers above $613,700.

If the underlying property was depreciable business property, part of the accelerated gain can be ordinary income. Depreciation recapture under Section 1245 for tangible personal property, or Section 1250 for real property, keeps its ordinary character when the note is disposed of.² For real property, the portion tied to straight-line depreciation is unrecaptured Section 1250 gain, taxed at a maximum 25% rate, and any remaining gain gets the normal long-term capital gains rate.⁴

Because rates differ, trace each dollar of accelerated gain back to its component in the original sale. Miscategorizing recapture as capital gain, or the reverse, produces the wrong tax.

Canceling a Related Party’s Note

Forgiving a family member’s balance on an installment note deserves its own warning. For cancellations between related parties, the fair market value used to measure your gain cannot be less than the full face amount of the obligation.¹ Even if the relative could never realistically pay and the note would trade for pennies in an arm’s-length sale, you recognize gain as though the face amount had been paid. The related-party floor turns what feels like a generous gesture into the largest possible tax bill on the note.

Transfers That Don’t Trigger Tax

A handful of transfers let the new holder step into your position and keep deferring the gain.

Death of the Holder

When the person holding the installment obligation dies, passing the note to the estate or a beneficiary is not a taxable disposition.¹ But there is no basis step-up on death for an installment note. The remaining deferred gain is income in respect of a decedent under Section 691, and the heir or estate reports it as payments come in, using the same gross profit percentage and preserving the same character (capital or ordinary) that the decedent had.⁵ If estate tax was paid on the value of the obligation, the recipient can deduct the estate tax attributable to the deferred income.

If the estate or heir later disposes of the note instead of collecting on it, the FMV at the time of that disposition goes into gross income, along with any excess consideration.⁵

Spouses and Divorce

Transferring the note to a spouse, or to a former spouse if the transfer is incident to divorce, is not a taxable event. Section 1041 treats it as a gift for tax purposes, and the receiving spouse takes over your basis and gross profit percentage, reporting the deferred gain as principal payments arrive.⁶ A transfer counts as incident to divorce if it happens within one year after the marriage ends or is related to the ending of the marriage.

Contributions to Controlled Corporations or Partnerships

Contributing an installment obligation to a corporation you control in exchange for stock, under Section 351, is not a taxable disposition. The corporation takes a carryover basis and recognizes the remaining gain as payments come in.⁷

Contributing the note to a partnership in exchange for a partnership interest works the same way under Section 721. Neither the partner nor the partnership recognizes gain or loss, and the deferred gain carries over.⁸

Subsidiary Liquidations

When a subsidiary distributes an installment obligation to its parent in a complete liquidation under Section 332, the parent recognizes no gain or loss on receipt.⁹ The parent continues reporting the deferred gain using the subsidiary’s original gross profit percentage.

When Modifying the Note Becomes a Disposition

Changing the terms of an installment obligation can itself be a disposition, even without any transfer to a third party. Adding a guarantor or co-obligor while leaving the payment terms alone generally does not count. Substantially altering the terms, however, can be treated as a deemed disposition of the original note and the creation of a new one. The question, as the IRS has framed it, is whether your rights under the original agreement have materially changed or disappeared. If the economic deal is fundamentally different, the original obligation is treated as disposed of, and the deferred gain accelerates.

Administrative changes like correcting a name, updating a mailing address, or swapping in collateral of equivalent value stay on the safe side. Extending the payment term by several years or converting a fixed rate to a variable one sits in the gray zone. Get advice before signing amended terms, because an inadvertent disposition produces a surprise tax bill.

Reporting and Estimated Tax

Report the accelerated gain on Form 6252, Installment Sale Income, for the year of the disposition.¹⁰ You’ll need the amount realized and your adjusted basis in the obligation. Pull the original Form 6252 from the year of sale to confirm the gross profit percentage and contract price you started with.

Where the gain lands depends on its character. Capital gains flow to Schedule D. Ordinary income from Section 1245 or 1250 recapture routes through Form 4797, Sales of Business Property, before reaching your main return.¹¹

A mid-year disposition can drop a large gain into a single quarter and create an estimated tax problem. You generally need to pay at least 90% of your current-year liability through withholding or estimates to avoid an underpayment penalty.¹² If the disposition happens in July, the September 15 estimated payment covering June through August is where you cover it.

If your income is concentrated in one part of the year, Schedule AI of Form 2210 lets you use the annualized income installment method to reduce or eliminate penalties for earlier quarters when the income hadn’t been earned yet.¹³ Use it for one quarter and you use it for all four.

Missing the gain, or reporting it in the wrong year, exposes you to the accuracy-related penalty of 20% of the underpayment attributable to the understatement.¹⁴ An understatement is substantial when it exceeds the greater of 10% of the correct tax or $5,000, and the penalty runs on top of interest on the unpaid amount.

1
Office of the Law Revision Counsel. 26 U.S. Code 453B – Gain or Loss on Disposition of Installment Obligations
2
Internal Revenue Service. Publication 537 – Installment Sales
3
Office of the Law Revision Counsel. 26 U.S. Code 453A – Special Rules for Nondealers
4
Internal Revenue Service. Topic No. 409 Capital Gains and Losses
5
Office of the Law Revision Counsel. 26 USC 691 – Recipients of Income in Respect of Decedents
6
Office of the Law Revision Counsel. 26 U.S. Code 1041 – Transfers of Property Between Spouses or Incident to Divorce
7
Office of the Law Revision Counsel. 26 U.S. Code 351 – Transfer to Corporation Controlled by Transferor
8
Office of the Law Revision Counsel. 26 U.S. Code 721 – Nonrecognition of Gain or Loss on Contribution
9
Office of the Law Revision Counsel. 26 U.S. Code 332 – Complete Liquidations of Subsidiaries
10
Internal Revenue Service. About Form 6252, Installment Sale Income
11
Internal Revenue Service. Instructions for Form 4797
12
Internal Revenue Service. Pay as You Go, So You Won’t Owe: A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty
13
Internal Revenue Service. Instructions for Form 2210
14
Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments