Ala. Code § 45-17-90.09: Exemption from Taxation.

The authority, its property, real and personal, any income produced and all conveyances, deeds, leases, mortgages, and deeds of trust, shall be exempt from all taxation by the State of Alabama or any political or administrative subdivision thereof, including, but not limited to, all income, ad valorem, sales, excise, license, and privilege taxes and fees.