Ala. Code § 22-51-13

The corporations authorized in this chapter and their property, including bonds, conveyances, mortgages, leases, and deeds, and all income from such property and the operation of programs shall be exempt from all taxation, and no excise tax may be imposed on any corporation for the privilege of engaging in any of the activities authorized by this chapter; provided, that the corporation must adhere to minimum standards for licensure as provided by Chapter 50 of this title.