Rules relating to average benefit
For purposes of subparagraph (E)—
(i)#
the average benefit provided to participants under the plan will be treated as having remained the same between the 2 dates described in subparagraph (E)(ii) if the benefit formula applicable to such participants has not changed between such dates, and
(ii)#
if the benefit formula applicable to 1 or more participants under the plan has changed between such 2 dates, then the average benefit under the plan shall be considered to have increased by more than 50 percent only if—
(I) the total amount determined under section 430(b)(1)(A)(i) for all participants benefitting under the plan for the plan year in which the 5-year period described in subparagraph (E) ends, exceeds
(II) the total amount determined under section 430(b)(1)(A)(i) for all such participants for such plan year, by using the benefit formula in effect for each such participant for the first plan year in such 5-year period,
(ii)(I)#
the total amount determined under section 430(b)(1)(A)(i) for all participants benefitting under the plan for the plan year in which the 5-year period described in subparagraph (E) ends, exceeds
(ii)(II)#
the total amount determined under section 430(b)(1)(A)(i) for all such participants for such plan year, by using the benefit formula in effect for each such participant for the first plan year in such 5-year period,
by more than 50 percent. In the case of a CSEC plan (as defined in section 414(y)), the normal cost of the plan (as determined under section 433(j)(1)(B)) shall be used in lieu of the amount determined under section 430(b)(1)(A)(i).