such plan previously elected the application of this paragraph). The preceding sentence shall not apply to a plan with respect to which a partition order is in effect under section 4233A of the Employee Retirement Income Security Act of 1974. . (b) Effective dates (1) In general The amendments made by this section shall take effect as of the first day of the first plan year ending on or after February 29, 2020, except that any election a plan makes pursuant to this section that affects the plan’s funding standard account for the first plan year beginning after February 29, 2020, shall be disregarded for purposes of applying the provisions of section 305 of the Employee Retirement Income Security Act of 1974 and section 432 of the Internal Revenue Code of 1986 to such plan year. (2) Restrictions on benefit increases Notwithstanding paragraph (1), the restrictions on plan amendments increasing benefits in sections 304(b)(8)(D) of such Act and 431(b)(8)(D) of such Code, as applied by the amendments made by this section, shall take effect on the date of enactment of this Act. 106. PBGC guarantee for participants in multiemployer plans Section 4022A(c)(1) of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1322a(c)(1) ) is amended by striking subparagraphs (A) and (B) and inserting the following: (A) 100 percent of the accrual rate up to $15, plus 75 percent of the lesser of— (i) $70