Iowa Code § 626.82: Overplus.

When the property sells for more than the amount required to be collected, the overplus must be paid to the debtor, unless the officer has another execution in the officer’s hands on which said overplus may be rightfully applied, or unless there are liens upon the property which ought to be paid therefrom, and the holders thereof make claim to such surplus and demand application thereon, in which case the officer shall pay the same into the hands of the clerk of the district court, and it shall be applied as ordered by the court.