Revenue Rulings
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."
This is the single most important authority for the obligor-substitution pillar. The SIS does exactly what the ruling blesses — it releases the buyer and substitutes a new obligor (the assignment company) while keeping the seller's payment rights identical. Under 75-457, that substitution is not a §453B disposition and does not accelerate gain. Every SIS legal opinion traces back here.
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.
Provides margin. It confirms that even a combination of changes — new obligor plus a different rate — stays on the safe side of §453B, so long as the seller's fundamental right to the payment stream is intact. This insulates SIS structures where the assignment and annuity introduce rate-equivalent differences.
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
Part of the line of authority that certain modifications to an installment obligation do not amount to a satisfaction or disposition.
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. 65-29 | Installment-obligation treatment | Part of the historical ruling backdrop establishing that not every change in an installment obligation is a disposition |
| Rev. Rul. 76-133 | Installment method application | Background authority on installment-method mechanics |
| Rev. Rul. 79-220 | Installment sale / annuity-type payment timing | Cited in installment-sale literature on the timing of income recognition where payments are spread — conceptually adjacent to the SIS payment-stream analysis |
These older rulings are corroborating background rather than load-bearing; the SIS rests primarily on 75-457 and 82-122.
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