The date of the enactment of the Tax Cuts and Jobs Act, referred to in subsec. (a), probably means the date of enactment of title I of Pub. L. 115–97, which was approved Dec. 22, 2017. Prior versions of the bill that was enacted into law as Pub. L. 115–97 included such Short Title, but it was not enacted as part of title I of Pub. L. 115–97.

Pub. L. 115–97, title I, § 14102(d)(3), Dec. 22, 2017, 131 Stat. 2194, provided that: “The amendments made by this subsection [enacting this section] shall apply to transfers after December 31, 2017.”

Pub. L. 115–97, title I, § 14102(d)(4), Dec. 22, 2017, 131 Stat. 2194, provided that: “The amount of gain taken into account under section 91(c) of the Internal Revenue Code of 1986, as added by this subsection, shall be reduced by the amount of gain which would be recognized under section 367(a)(3)(C) (determined without regard to the amendments made by subsection (e) [amending section 367 of this title]) with respect to losses incurred before January 1, 2018.”