Ala. Code § 40-21-85 — Administration of Article and Collection of Tax

(a) The provisions of this article shall be administered and the tax herein levied shall be collected in accordance with the uniform procedures set forth in this title, along with the procedures set forth in Division 1 of Article 1 of Chapter 23 of this title, for administering and collecting the tax therein levied, and for such purposes there are hereby incorporated into this article by reference the provisions of Sections 40-23-8 through 40-23-12, 40-23-25 and 40-23-27 through 40-23-31, together with the definitions applicable to said sections contained in Section 40-23-1; provided, that in the event of the repeal of such division, such repeal shall not operate to eliminate the tax collection procedures contained therein to the extent they are incorporated in this article by reference, unless the legislation providing for such repeal shall clearly indicate such a result.
The taxes herein levied shall be due and payable as follows:
(1) Any taxpayer liable for taxes under the provisions of this subdivision whose average monthly tax liability was less than $10,000 during the preceding calendar year shall remit such taxes in accordance with Section 40-23-7.
(2) Any taxpayer liable for taxes under the provisions of this subdivision whose average monthly tax liability was $10,000 or greater during the preceding calendar year shall make estimated payments to the Revenue Department on or before the twentieth day of the month in which the liability occurred.
(b) The amounts of the payment shall be at least equal to the taxpayer’s actual tax liability for the same calendar month of the preceding year.
(c) Any outstanding credit or deficit arising from the taxpayer’s overpayment or underpayment of its final liability shall be applied to either increase or reduce, as the case may be, that month’s final tax liability which shall be reported and paid not later than the twentieth of the month next succeeding the month in which the tax accrues. The provisions of Section 40-23-7 shall apply to the filing of the monthly tax liability report.
(d) In those instances where a taxpayer due to divestiture compliance with a lawful order of a court of competent jurisdiction, or the sale of a portion of the business on which said tax is applicable, where such divestiture compliance or sale reduces the gross revenues of the taxpayer, the Commissioner of Revenue shall determine for a period of 12 months following such divestiture compliance or sale the monthly estimated tax liability and shall consider among others, the financial historical data and the percentage of divestiture or sale of said business of the taxpayer. Following the 12-month period, taxes shall be remitted in accordance with subsection (c) of this section.
(e) In those instances where there is no preceding calendar year for purposes of determining the tax liability of any taxpayer, the Commissioner of Revenue shall determine for a period of 12 months the monthly estimated tax liability for the taxpayer. Following the 12-month period, taxes shall be remitted in accordance with subsection (c) of this section.