Ala. Code § 40-13-3
Every producer shall, within 20 days after the end of each calendar month, whether or not he shall have actually severed any coal during the preceding month, file with the commissioner a report. The report shall set forth, in a form to be prescribed by the commissioner, the amount of coal in tons, if any, severed by such producer during the next preceding calendar month, the point of severance thereof, the amount of tax due and such other information as the commissioner may reasonably require for the proper enforcement of the provisions of this article. The producer shall accompany such report with payment of the full amount of the tax shown to be due. The said report shall be signed by the producer himself in the instance of any individual producer, and by a member or officer or the manager of the producer in all other instances.
Ala. Code § 40-13-3 (1975)