Ala. Code § 45-3A-51.04: Returns; Computation, Deduction, and Transmission of Tax.

On or before 30 days after the end of the tax year, each person, firm, or corporation liable for the payment of a privilege tax as levied by this part shall make a return showing the gross proceeds of business done and compute the amount of tax chargeable against him or her, or it in accordance with this part and deduct the amount of monthly payments as hereinbefore provided, if any have been made, and transmit with this report a remittance in the form required by this part covering the residue of the tax chargeable against him or her, to the city, and such report shall be verified by oath.