PUBLIC LAW 100-647—NOV. 10, 1988	102 STAT. 3763
"(II) 'Al' is the contribution rate determined
under clause (i) for such employer's first full cal-
endar year;
"(III) 'A2' is the contribution rate which would
have been determined under clause (i) if the
employer's second calendar year had been its first
full calendar year;
"(IV) 'A3* is the contribution rate which would
have been determined under clause (i) if the
employer's third calendar year had been such
employer's first full calendar year;
(V)	'B' is the contribution rate for the employer
as determined under subparagraph (C) for the
employer's second full calendar year; and
(VI)	*C' is the contribution rate for the employer
as determined under subparagraph (C) for the
employer's third full calendar year.
"(vi) special rule for certain computations.—For
purposes of computing B and C in such formulas—
"(I)   the   percentage   rate   computed   under
subparagraph  (C), shall  not be reduced under
clause (viii) of that subparagraph; and
"(II) any computations which under subpara-
graph (C) are to be made on the basis of a 4-quarter
or 12-quarter period ending on a given June 30
shall be made on the basis of a period commencing
with the first day of the first calendar quarter that
begins after the date on which the employer first
commenced paying compensation subject to this
Act and ending on that June 30, and the amount so
computed shall be increased to an amount that
bears the same ratio to the amount so computed as
4 or 12, as appropriate, bears to the number of
calendar quarters in the period on which the com-
putation was based.
"(2) benefit ratio.—An employer's benefit ratio as of any
given June 30 shall be determined by dividing all benefits
charged to the employer under paragraph (15) during the 12
calendar quarters ending on such June 30 by the employer's
3-year compensation base as of such June 30 as computed under
paragraph (3).
"(3) 3-YEAR compensation base.—An employer's 3-year com-
pensation base as of any given June 30 is the aggregate com-
pensation with respect to which contributions were paid by the
employer under this subsection in the 12 calendar quarters
ending on such June 30.
"(4) reserve ratio.—An employer's reserve ratio as of an^y
given June 30 shall be computed by dividing the employers
reserve balance as of such June 30, as computed under para-
graph (6), by that employer's 1-year compensation base as of
such June 30, as computed under paragraph (5). The employer's
reserve ratio may be either a positive or a negative figure,
depending upon whether the employer's reserve balance is a
positive or negative figure.
"(5) i-year compensation base.—An employer's 1-year com-
pensation base as of any given June 30 is the aggregate com-
pensation with respect to which contributions were paid by the