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property ending July 31, 1969 bears to the number of full calendar months in the taxpayer's entire holding period for the property. (C) The Department shall prescribe such regulations as may be necessary to carry out the purposes of this paragraph. (g) Double deductions. Unless specifically provided otherwise, nothing in this Section shall permit the same item to be deducted more than once. (h) Legislative intention. Except as expressly provided by this Section there shall be no modifications or limitations on the amounts of income, gain, loss or deduction taken into account in determining gross income, adjusted gross income or taxable income for federal income tax purposes for the taxable year, or in the amount of such items entering into the computation of base income and net income under this Act for such taxable year, whether in respect of property values as of August 1, 1969 or otherwise. (Source: P.A. 103-8, eff. 6-7-23; 103-478, eff. 1-1-24; 103-592, Article 10, Section 10-900, eff. 6-7-24; 103-592, Article 170, Section 170-90, eff. 6-7-24; 103-605, eff. 7-1-24; 103-647, eff. 7-1-24; 104-6, eff. 6-16-25; 104-417, eff. 8-15-25; 104-453, eff. 12-12-25.) SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468