1.846-4—Effective/applicability date.
(a) In general.
Sections 1.846-1 through 1.846-3 apply to taxable years beginning after December 31, 1986.
(b) election.
Section 1.846-2(d) applies to section 846(e) elections made with regard to a qualified stock purchase made on or after April 10, 2006.