Updated July 29, 2026. Quick answer: Not under any of the four enumerated triggers — a collar is not a short sale, an offsetting notional principal contract, a forward contract to deliver, or the mirror of one. The only provision that could reach it is the §1259(c)(1)(E) catch-all, which operates “to the extent prescribed by the Secretary in regulations.” Treasury has never issued a regulation under §1259. So the honest answer is that the question is open, and any page that gives you a confident percentage band is making it up.
The gap, and how it got there
The fact the marketing leaves out: there is no Treasury regulation under §1259. Section 1259(c)(1) lists four transactions that trigger a constructive sale — a short sale, an offsetting notional principal contract, a futures or forward contract to deliver, and the mirror case of acquiring the property when you are already short. A collar is none of them. The only way to reach one is subparagraph (E), and (E) applies by its own terms only “to the extent prescribed by the Secretary in regulations.” Walking the current eCFR structural index for Title 26 for any node containing “1259” returns nothing: 26 CFR part 1 runs from §1.1258-1 directly into the §1260 rules. Congress in 1997 expressly asked Treasury to set collar standards and said it expected them to apply prospectively. Nearly three decades later they do not exist.
This is not an oversight anyone hid. The 1997 conference report says plainly that both chambers described collar transactions and “recommend that Treasury regulations provide standards for determining which collar transactions result in constructive sales,” and that the conferees expected those regulations to apply prospectively except to prevent abuse. Congress identified the exact question, assigned it, and it was never answered.
Why the popular rules of thumb are not law. Practitioner shorthand about “safe” collar widths circulates widely. None of it traces to anything locatable: there is no regulation under §1259 in the current Code of Federal Regulations, and a search for a revenue ruling addressing collars under §1259 returned none. No case-law search on collars was run for this page, so it does not claim there is no case — only that no published guidance supplies a band. The one band that appears in primary text belongs to a different instrument on different facts: Rev. Rul. 2003-7 involved a prepaid variable forward whose deliverable share count ranged from 80 to 100 shares, and the ruling used that variation to conclude the contract was not one for a substantially fixed amount. That is a finding about that contract, not a bandwidth anyone may borrow. No safe band is published here because there is none to publish.
What can be said with confidence
- A collar is not within §1259(c)(1)(A), (B), (C) or (D) on the plain text.
- Subparagraph (E) is the only route to it and is inoperative without regulations.
- No regulation under §1259 exists in the current Code of Federal Regulations.
- Congress anticipated collar regulations and expected them to be prospective.
- Section 1259 reaches only constructive sales occurring after June 8, 1997.
What this means for a decision
An answer that rests on an absence is still an answer, but it carries a different kind of risk from one that rests on a ruling. Regulations can be written. The conference report’s prospectivity expectation is an expectation, not a statutory bar, and it carries an abuse exception on its face. A holder relying on collar treatment is relying on Treasury continuing not to act — which is a reasonable bet after nearly three decades and is not the same thing as compliance.
By contrast, the prepaid variable forward has a published ruling, which is why the more complicated instrument sits on the firmer ground. The two side by side.
Sources
IRC §1259(c)(1)(A)–(E), §1259(c)(3)(A) and (B), §1259(d)(1) and §1259(f); Pub. L. 105-34 §1001(d) (effective-date note); H.R. Conf. Rep. No. 105-220, at 512 (1997); Rev. Rul. 2003-7, 2003-1 C.B. 363. Absence of any regulation under §1259 verified against the eCFR structural index for Title 26, 2026-07-01 edition. All read July 2026.
This states what the cited authority says. It is not tax or legal advice. Constructive-sale analysis, partnership nonrecognition and insider-trading defences all turn on transaction documents and facts that no page can see, and the instruments described here are executed under contracts whose terms vary by provider.