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Directory Results for Illinois Department of Revenue IL-990-T Instructions What s new for 1998 Effective for tax years ending on or after December 31, 1998, the three-factor apportionment ula (property, payroll, and sales) changes - tax illinois to Illinois Department of Revenue IL-b2220b b2013b Computation of

Illinois Department of Revenue IL-990-T Instructions What s new for 1998 Effective for tax years ending on or after December 31, 1998, the three-factor apportionment ula (property, payroll, and sales) changes - tax illinois
Illinois Department of Revenue IL-b2220b b2013b Computation of