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this subparagraph (U) are exempt from the provisions of Section 250. (e) Gross income; adjusted gross income; taxable income. (1) In general. Subject to the provisions of paragraph (2) and subsection (b)(3), for purposes of this Section and Section 803(e), a taxpayer's gross income, adjusted gross income, or taxable income for the taxable year shall mean the amount of gross income, adjusted gross income or taxable income properly reportable for federal income tax purposes for the taxable year under the provisions of the Internal Revenue Code. Taxable income may be less than zero. However, for taxable years ending on or after December 31, 1986, net operating loss carryforwards from taxable years ending prior to December 31, 1986, may not exceed the sum of federal taxable income for the taxable year before net operating loss deduction, plus the excess of addition modifications over subtraction modifications for the taxable year. For taxable years ending prior to December 31, 1986, taxable income may never be an amount in excess of the net operating loss for the taxable year as defined in subsections (c) and (d) of Section 172 of the Internal Revenue Code, provided that when taxable income of a corporation (other than a Subchapter S corporation), trust, or estate is less than zero and addition modifications, other than those provided by subparagraph SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468