Ala. Code § 40-13-57 — Time for Making Return; Delinquent Taxes; Penalties

(a) The tax levied by this article shall become delinquent on the twenty-first day of the month next succeeding the month in which the tax is due. Provided, however, that the department, for good cause shown, may extend the time for making a return required under this article pursuant to rules adopted by the department.
(b) The department shall impose interest and penalties on unpaid taxes which become delinquent. One-half of all interest and penalties collected with respect to the tax imposed by this article shall be retained by the department to help defray the expenses of administration and collection of the tax.
(c) No penalties shall be imposed by the department against a producer or purchaser for any severance tax due under Act 2012-318 based upon an interpretation of the provisions of that act until and unless such time as the department has adopted rules related to such provision of that act and the rules have been effective for 60 days thereafter. Thereafter, any penalties assessed under this tax may be abated by a showing of reasonable cause.