Content reviewed October 17, 2026 · Educational reference
The obligor-substitution line — binding on the IRS, citable by taxpayers.
3.1 · Rev. Rul. 75-457 — The Cornerstone
A seller sold real property on the installment method; the buyer later resold the property; the seller released the original buyer and substituted the new buyer as obligor under the same terms. The IRS held: "The mere substitution and release of the original obligor on an installment obligation, and the assumption of the installment obligation by a new obligor, without any other changes, will not in itself constitute a satisfaction or disposition under section 453(d)" [now §453B]. The test: a disposition occurs only when the seller's rights "disappear or are materially … altered so that the need for postponing recognition of gain … ceases."
Rev. Rul. 75-457 supplies a central proposition: the substitution and release described in the ruling did not itself dispose of the installment obligation when the terms otherwise remained unchanged. An SIS advisor compares the proposed assumption with that fact pattern. The ruling does not itself analyze every funding arrangement, simultaneous closing, third-party-note question, or buyer-fallback clause found in a modern SIS.
3.2 · Rev. Rul. 82-122 — Amplifying 75-457
Same scenario as 75-457, but the interest rate (and resulting monthly payment) also changed. The IRS held that obligor substitution combined with an interest-rate change still did not constitute a §453B disposition — "the changes in the obligor, and the interest rate neither eliminate nor materially alter the rights of the taxpayer." It amplifies 75-457.
Rev. Rul. 82-122 shows that an obligor substitution accompanied by an interest-rate change can preserve installment treatment on the ruling’s facts. It supports analysis of the actual modifications; it does not authorize free changes to any schedule or permit a funding instrument’s economics to replace the seller-rights inquiry.
3.3 · Rev. Rul. 74-157 — Multiple Notes Substituted for One
Substituting two notes for one original installment note is not a disposition of the installment obligation.
A building block 75-457 relied upon. It supports the broader principle that mechanical changes to the form of the obligation, without altering the seller's economic rights, do not trigger gain — relevant whenever an SIS restructures the payment documentation.
3.4 · Rev. Rul. 68-419 — Modification Without Disposition
Rev. Rul. 68-419 considered deferring scheduled principal payments for five years and increasing the interest rate from 6% to 7%. The modification did not constitute satisfaction or disposition of the installment obligation. The IRS describes this holding in PLR 201144005.
Cited by the IRS in later PLRs (e.g., 201248008) as part of the chain confirming that deferring maturity, substituting obligors, and adjusting rates do not, individually or together, constitute a §453B disposition. It reinforces the obligor-substitution pillar.
3.5 · Earlier Installment-Sale Rulings (context)
| Cite | Subject | Relevance to SIS |
|---|---|---|
| Rev. Rul. 79-220 | Exclusion of qualifying periodic injury damages under §104 | Structured-settlement background; it does not establish installment-sale gain recognition for an SIS seller |
Use the older context citations only for propositions established by their actual text. They are not substitutes for the central obligor-modification rulings or for analyzing §453 payment and receipt issues. The application of injury-settlement authority to a taxable property sale must expressly acknowledge the different tax regimes.
Practical use
Record the precise proposition supported, facts that match, facts that differ, and any later law. Published authority may support an issue without blessing the entire funded transaction. See the substitute-obligor and goodwill chapters for the required analysis.
Sources: IRC §104 — injury and sickness payments; IRC §130 — qualified assignments; T.D. 8675 — debt modifications, IRS Bulletin 1996-29; IRC §1060 — allocation of business purchase price; IRC §453 — installment method.
↑ Back to top