the case of an individual who elects to receive disability insurance benefits during such individual’s waiting period pursuant to paragraph (1), the individual may revoke such election during the periods described in this subparagraph, except that in no event shall such elections or revocations occur in the first month of an established period of eligibility. (B) In the case of an individual electing to receive a disability insurance benefit during the individual’s waiting period pursuant to paragraph (1), such individual's disability insurance benefit for any month during or after such waiting period shall— (i) be equal to the product of— (I) the disability insurance benefit amount determined under paragraph (2) (as determined before application of this paragraph), multiplied by (II) the percentage determined under subparagraph (C) for the month during which such individual first becomes entitled to such disability insurance benefit, (ii) continue unchanged for the entire period of eligibility for such disability insurance benefit, and without the effect of recalculations described under subparagraph (C), and (iii) if applicable, be paid as part of a claim of entitlement to past-due benefits under this title and included in the total dollar amount of such past-due benefits. (C) The percentage determined under this subparagraph shall be— (i) for any month in the 36-month period beginning with the first month that begins after the date that is 180 days after the date of enactment of this paragraph, 96 percent, and (ii) for any subsequent month, the percentage most recently certified by the Commissioner under paragraph (D)(ii). (D) (i) Not later than the end of the 36-month period described under subparagraph (C)(i), and not later than the end of every 5-year period thereafter, the Chief Actuary of the Social Security Administration shall calculate a percentage such that the fiscal impact over a 75-year period upon the Federal Disability Insurance Trust Fund if all individuals who applied pursuant to paragraph (1)