Iowa Code § 421B.10
The director of revenue, or any person or persons injured by any violation, or who would suffer injury from any threatened violation of this chapter, may maintain an action in any equity court to enjoin such actual or threatened violation. If a violation or threatened violation of this chapter shall be established, the court shall enjoin such violation or threatened violation, and, in addition thereto, the court shall assess in favor of the plaintiff and against the defendant the costs of suit including reasonable attorney fees. Where alleged and proved, the plaintiff, in addition to such injunctive relief and costs of suit, including reasonable attorney fees, shall be entitled to recover from the defendant the actual damages sustained by the plaintiff.
Iowa Code § 421B.10