Ala. Code § 39-2-14

(a) Every nonresident contractor, as defined in Section 39-2-12 shall register with the Department of Revenue prior to engaging in the performance of a contract in this state. At the time of registration the contractor shall deposit with the Department of Revenue five per centum of the amount such contractor is to receive for the performance of the contract which shall be held within a “contractors use tax fund” pending the completion of the contract, the determination of the taxes due this state and other governmental bodies, and the payment of same. In lieu of such deposit the contractor may provide a corporate surety bond to be approved by the Commissioner of Revenue as to form, sufficiency, value, amount, stability, and other features necessary to provide a guarantee of payment of the taxes due this state and other governmental bodies.

(b) In addition, within 30 days after registration, the contractor shall file a statement with the Department of Revenue itemizing the machinery, materials, supplies, and equipment that he has or will have on hand at the time he begins the fulfillment of the contract where such tangible personal property has been brought, shipped, or transported from outside the State of Alabama upon which neither the use taxes or ad valorem taxes have been paid and shall pay the tax due thereon at the time of filing and thereafter shall report and pay the tax as required by the Commissioner of Revenue.

(c) Upon payment of the said taxes due, as required hereby, the deposit or the surety bond required herein shall be returned forthwith to the out-of-state contractor posting same.

(d) The Commissioner of Revenue shall have authority to promulgate rules and regulations to carry out the provisions of this section.