Iowa Code § 626.42: Statement of indebtedness.

For the purpose of enabling the attaching or execution creditor to determine the amount to be tendered or deposited to hold the levy under the writ of attachment or execution, the person entitled to receive payment of the secured debt shall deliver to any such person, upon written demand therefor, a statement in writing under oath, showing the nature and amount of the original debt, the date and the amount of each payment, if any, which has been made thereon, and an itemized statement of the amount then due and unpaid.