Treas. Reg. § 1.501(c)(9)-8

(a) General rule. Except as otherwise provided in this section, the provisions of §§ 1.501(c)(9)-1 through 1.501(c)(9)-7 shall apply with respect to taxable years beginning after December 31, 1954.

(b) Pre-1970 taxable years. For taxable years beginning before January 1, 1970, section 501(c)(9)(B) (relating to the requirement that 85 percent or more of the association's income consist of amounts collected from members and contributed by employers), as in effect for such years, shall apply.

(c) Existing associations. Except as otherwise provided in paragraph (d), the provisions of § 1.501(c)(9)-2(a)(1) and (c)(3) shall apply with respect to taxable years beginning after December 31, 1980.

(d) Collectively-bargained plans. In the case of a voluntary employees' beneficiary association which receives contributions from one or more employers pursuant to one or more collective bargaining agreements in effect on December 31, 1980, the provisions of §§ 1.501(c)(9)-1 through 1.501(c)(9)-5 shall apply with respect to taxable years beginning after the date on which the agreement terminates (determined without regard to any extension thereof agreed to after December 31, 1980).

(e) Election. Notwithstanding paragraphs (c) and (d) of this section, an organization may choose to be subject to all or a portion of one or more of the provisions of these regulations for any taxable year beginning after December 31, 1954.