Listed Option Collars with Margin Loans Are Structurally Inferior to Variable Prepaid Forwards: Character Degradation and Phantom Income

Abstract

Variable prepaid forward contracts and option collars paired with margin loans offer similar economics on concentrated equity: downside protection and day-one liquidity in exchange for capped upside. The key difference is tax treatment. A variable prepaid forward is a single contract whose gain or loss is computed on a net basis, whereas a collar consists of two separate options, each tested independently. We model both structures at close (physical settlement) and at roll (cash settlement) and show that the economic difference between the two solutions can be explained by character degradation (the deferral of an option loss into a stock basis adjustment that, when recovered as reduced long-term gain, yields less after-tax value per dollar than a current offset against short-term income), phantom income (a current tax liability with no corresponding net economic gain), and financing spread. In nearly all circumstances, we conclude that the variable prepaid forward is a structurally more efficient alternative.