Ala. Code § 40-21-32: Procuring Information from Other Sources When Taxpayer Fails to Comply.

If any person, association, company or corporation embraced within the provisions of this chapter shall fail to make the returns and statements, or any of them, required by the provisions of this chapter, or to furnish any other information lawfully required of it within the time limited, the Department of Revenue must procure the necessary information from some other sources upon which to base an ascertainment of the values of the tangible and intangible property or franchise of such person, association of persons, company, or corporation, and shall proceed to ascertain the value of such property.