The regulations aren't entirely clear whether, in the case of gain recognized by a married couple, just one spouse can invest the gain in a Qualified Opportunity Fund (QOF). The regulations do provide that a transfer of a QOF interest from a person to his spouse is an inclusion event, which indicates that gains might not be interchangeable among spouses. We have advised that, to be on the safe side, if a particular spouse or a married couple jointly recognizes gain, then that spouse or the couple, respectively, should make the investment in the QOF.