Ala. Code § 11-51-28

Unless otherwise provided by law or its charter, when a special tax is levied by a town or city for any purpose, the levy, collection, and disbursement thereof shall be kept separate in all respects from the levy, collection, and disbursement of general municipal taxes, and all moneys, books, receipts, vouchers, and warrants relating thereto shall be kept separate and shall express on their face that they relate to the special tax and state the object of the tax, but the same officers may act in the levy, assessment, collection, and disbursement of the general and special taxes, unless otherwise provided. If, after the purpose of the special tax is accomplished, there remains a balance over, it shall be transferred to the general fund of the municipality.