102 STAT. 3764
PUBLIC LAW 100-647—NOV. 10, 1988 employer under this subsection in the 4 calendar quarters ending on such June 30. "(6) RESERVE BALANCE.—An employer's reserve balance as of any given June 30 shall be determined by subtracting the employer's cumulative benefit balance as of such June 30, computed under paragraph (7), from the employer's net cumulative contribution balance as of such June 30, computed under paragraph (8). An employer's reserve balance may be either positive or negative, depending upon whether or not that employer's net cumulative contribution balance exceeds the employer's cumulative benefit balance. (7) CUMULATIVE BENEFIT BALANCE.—An employer's cumulative benefit balance as of any given June 30 shall be determined by adding— "(A) the net amount of the benefits charged to the employer under paragraph (15) on or after January 1, 1990; ana "(B) the cumulative amount of the employer's unallocated charges for the same period, if any, as computed under paragraph (9). "(8) NET CUMULATIVE CONTRIBUTION BALANCE.—An employer's net cumulative contribution balance as of any given June 30 shall be determined as follows: "(A) STEP i.—Compute the sum of
"(i) all contributions paid by the employer pursuant to this subsection; "(ii) that portion of the tax imposed under section 3321(a) of the Internal Revenue Code of 1986 that is attributable to the surtax rate under section 516(b) of the Railroad Unemployment Insurance and Retirement Improvement Act of 1988; and ' (iii) any taxes paid by the employer pursuant to section 3321(a) of the Internal Revenue Code of 1986 (after the outstanding balance of loans made under section 10(d) before October 1, 1985, plus interest, have been paid); on or after January 1, 1990. "(B) STEP 2.—Subtract an amount equal to the amount of such contributions deposited to the credit of the fund under subsection (i). "(C) STEP 3.—Add an amount equal to the aggregate amount by which such contributions were reduced in prior calendar years as a result of pooled credits, if any, under paragraph (IXCXiii). "(9) UNALLOCATED CHARGE.—An employer's unallocated charge as of any given June 30 is the amount that as of such June 30 bears the same ratio to the system unallocated charge balance, computed under paragraph (10), as the employer's 1-year compensation base, computed under paragraph (5), bears to the system compensation base computed under paragraph (11). "(10) SYSTEM UNALLOCATED CHARGE BALANCE.—The S3rstem
unallocated charge balance as of any given June 30 shall be determined as follows: "(A) STEP i.—Compute the aggregate amount of all interest paid by the account on loans from the Railroad Retirement Account after September 30, 1985, pursuant to
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