Iowa Code § 537.2508: Conversion to open-end credit.

The parties may agree at or within ten days prior to the time of conversion to add the unpaid balance of a consumer credit transaction, other than a consumer lease or a consumer rental purchase agreement, not made pursuant to open-end credit to the consumer’s open-end credit account with the creditor. The unpaid balance so added is an amount equal to the amount financed determined according to the provisions on finance charge on refinancing under section 537.2504.