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depreciation deduction of a percentage other than 30%, 50% or 100% of the adjusted basis was taken in a taxable year ending on or after December 31, 2021, "x" equals "y" multiplied by 100 times the percentage bonus depreciation on the property (that is, 100(bonus%)) and then divided by 100 times 1 minus the percentage bonus depreciation on the property (that is, 100(1-bonus%)). The aggregate amount deducted under this subparagraph in all taxable years for any one piece of property may not exceed the amount of the bonus depreciation deduction taken on that property on the taxpayer's federal income tax return under subsection (k) or (n) of Section 168 of the Internal Revenue Code. This subparagraph (Z) is exempt from the provisions of Section 250; (AA) If the taxpayer sells, transfers, abandons, or otherwise disposes of property for which the taxpayer was required in any taxable year to make an addition modification under subparagraph (D-15), then an amount equal to that addition modification. If the taxpayer continues to own property through the last day of the last tax year for which a subtraction is allowed with respect to that property under subparagraph (Z) and for which the taxpayer was SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468