The income tax amount of a State for a payment period is 15 percent of the net amount collected during the calendar year ending before the beginning of the payment period from the tax imposed on the income of individuals by the State and described as a State income tax under section 164(a)(3) of the Internal Revenue Code of 1986 (
26 U.S.C. 164(a)(3)). The income tax amount for a payment period shall be at least 1 percent but not more than 6 percent of the United States Government individual income tax liability attributed to the State for the taxable year ending during the last calendar year ending before the beginning of the payment period. The Secretary shall determine the Government income tax liability attributed to the State by using the data published by the Secretary for 1991 in the publication Statistics of Income Bulletin (Winter 1993–1994).