A. This section applies if:

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1. An item of income was included in gross income for a prior taxable year or years because it appeared that the taxpayer had an unrestricted right to the item.

2. A deduction would be allowable under the internal revenue code or this title for the taxable year, without application of section 1341(b)(3) of the internal revenue code or section 43-1021, paragraph 9, because after the close of the prior taxable year or years it was established that the taxpayer did not have an unrestricted right to all or part of the item.

3. The amount of the deduction exceeds $3,000.

B. If all of the conditions in subsection A of this section apply, the tax imposed by this chapter for the taxable year is an amount equal to the tax for the taxable year computed without the deduction, minus the decrease in tax under this chapter for the prior taxable year or years that would result solely from excluding the item or portion of the item from gross income for the prior taxable year or years.

C. If the decrease in tax exceeds the tax imposed by this chapter for the taxable year, computed without the deduction, the excess is considered to be a payment of tax on the last day prescribed by law for the payment of tax for the taxable year and shall be refunded or credited in the same manner as if it were an overpayment for the taxable year.

D. Subsection B of this section does not apply to any deduction that is allowable with respect to an item that was included in gross income by reason of the sale or other disposition of stock in trade of the taxpayer, or other property of a kind that would properly have been included in the inventory of the taxpayer on hand at the close of the prior taxable year, or property that is held by the taxpayer primarily for sale to customers in the ordinary course of the taxpayer’s trade or business. This subsection does not apply if the deduction arises out of refunds or repayments with respect to rates made by a regulated public utility that is listed in section 7701(a)(33)(A) through (H) of the internal revenue code, if the refunds or repayments are:

1. Required to be made by the government, political subdivision, agency or instrumentality referred to in that section.

2. Required to be made by an order of a court.

3. Made in settlement of litigation or under threat or imminence of litigation.

E. If the exclusion under subsection B of this section results in:

1. A net operating loss for the prior taxable year or years for purposes of computing the decrease in tax for the prior year or years under subsection B of this section:

(a) The loss shall be:

(i) Carried over under this chapter to the same extent and in the same manner as was provided under prior law for taxable years beginning on or before December 31, 1989.

(ii) Carried back and carried over to the same extent and in the same manner as provided under section 172 of the internal revenue code for taxable years beginning from and after December 31, 1989.

(b) No carryover beyond the taxable year may be taken into account.

2. A capital loss for the prior taxable year or years, for purposes of computing the decrease in tax for the prior taxable year or years under subsection B of this section:

(a) The loss shall be carried back and carried over to the same extent and in the same manner as is provided under section 1212 of the internal revenue code.

(b) No carryover beyond the taxable year may be taken into account.

F. In computing Arizona taxable income for taxable years subsequent to the current taxable year, the net operating loss or capital loss determined in subsection E of this section shall be taken into account to the same extent and in the same manner as a net operating loss or capital loss sustained for prior taxable years.