Updated July 29, 2026. Quick answer: Both instruments bracket the price of a concentrated position. Only one of them monetizes it. A prepaid variable forward pays you cash at inception against a future delivery of a variable number of shares; a collar pays you nothing and simply sets a floor and a ceiling. If you need liquidity now, the collar cannot give it to you.
The structural difference
| Collar | Prepaid variable forward | |
|---|---|---|
| Cash at inception | None | Yes — a fixed amount, prepaid |
| What you owe later | Nothing; options settle | Delivery of a share count that varies with the price |
| Why it escapes §1259 | Not an enumerated trigger; the catch-all needs regulations that do not exist | Rev. Rul. 2003-7 — the variable share count defeats the “substantially fixed amount” element of §1259(d)(1) |
| Strength of that authority | An absence of guidance | A published revenue ruling squarely on point |
This is the one place where the more exotic instrument rests on the stronger authority. The prepaid variable forward has a published IRS ruling holding that it is neither a current sale nor a constructive sale. The collar has nothing — not a ruling, not a regulation, not a case. Practitioners treat collars as the conservative choice because they are simpler, but simplicity and authority are different things.
What the ruling requires, and what breaks it
Rev. Rul. 2003-7 is not a blessing of the instrument in the abstract. It is a holding on stated facts, and it names the facts that would change the answer — in particular restrictions on owning the pledged shares after the exchange date, and any expectation that the shareholder will lack the resources to settle in cash or other shares. Those are conditions on the deal documents, not on the label.
The share count has to vary, and vary a lot. The entire ruling turns on the delivery obligation not being “substantially fixed.” A structure whose variable band is narrow enough to be economically equivalent to a fixed delivery is not the structure the IRS ruled on, and the ruling does not reach it. There is no published band that is safe and none is offered here.
Choosing between them
If the reason for the transaction is risk, a collar answers it and is the simpler document. If the reason is cash — a house, a tax bill, a capital call — the collar does not answer it at all, and the prepaid forward is the instrument built for it. The third route is to sell shares and pay the tax, which produces cash immediately and ends the position rather than financing around it.
Both instruments live inside the same statute. The four triggers in §1259(c)(1) are worth reading before either conversation.
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.