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            A. Notwithstanding the provisions of La. Rev. Stat. 47:287.441, if any item of income has been reported in a return and has borne tax in full for a period in which it was not properly reportable, the taxpayer shall not be required to report the same item of income in a subsequent period in which it would otherwise be properly reportable, unless the secretary shall have, prior to the running of prescription with respect to the first period, redetermined the tax liability for that period so as to eliminate the item of gross income improperly reported and shall have refunded or credited any resulting overpayment for that period.

            B. Period for which deductions and credits shall be taken.

            (1)(a) Taxable year for adjustments to taxpayer’s federal income tax return. Except as otherwise provided in this Paragraph, adjustments affecting federal taxable income which are made to the taxpayer’s income tax return subsequent to filing, whether made because of a deficiency proposed by the government, a court order, an amended return, or other appropriate instrument or act, showing an overpayment or a deficiency shall be taken into account for purposes of this Part in the period for which the return was filed, unless the prescriptive period for the collection of tax or the refund or credit of overpayments, as the case may be, has expired. If the applicable prescriptive period has expired, the additional tax paid by the taxpayer in the case of an underpayment or the refund or credit received by the taxpayer in the case of an overpayment shall be for the taxable year such tax was paid, such refund was received, or such credit was allowed, as the case may be.

            (b) When a federal refund results from transactions or conditions which arise after the close of the taxable year for which the refund is made, such federal refund shall be taken into account, for purposes of this Part, for the taxable year in which arose the transactions or conditions causing the refund.

            (2) Taking federal adjustments into account. A payment of additional federal tax upon income which has borne Louisiana tax shall be taken into account by decreasing taxable income. That portion, if any, of such additional federal tax payment which would be disallowed as a deduction under either La. Rev. Stat. 47:287.81 or 287.83 shall be excluded from such adjustment. Refunds or credits of federal overpayments, including refunds or credits created by the carryback of a federal net operating loss, shall be taken into account by increasing Louisiana net income or decreasing the Louisiana net loss, as the case may be. That portion, if any, of the federal refund or credit of an overpayment which has not previously been charged against or deducted from Louisiana net income shall be excluded from such adjustment.

            (3) Adjustments made to the Louisiana return. Adjustments to a return filed pursuant to this Part, whether initiated by the secretary or the taxpayer, shall be taken into account in the taxable year for which the return was filed in accordance with rules, regulations, or forms prescribed by the secretary.

            (4) If a deduction is claimed and allowed in any period, the same deduction cannot again be claimed in a subsequent period in which it otherwise would be properly deductible, unless the taxpayer, prior to the running of prescription with respect to the first period, shall have amended his return for that period so as to eliminate the deduction and shall have paid any additional tax which may be due as a result thereof, together with any interest and penalties that may be applicable thereto.

            Acts 1986, 1st Ex. Sess., No. 16, §1, eff. Dec. 24, 1986; Acts 2016, 1^st Ex. Sess., No. 30, §1; Acts 2021, No. 396, §1, eff. Jan. 1, 2022.