Iowa Code Title XIII. Commerce [Chs. 505-554D] § 537.2502. Delinquency charges

1. With respect to a consumer credit transaction not pursuant to an open-end credit arrangement and other than a consumer lease or consumer rental purchase agreement, the parties may contract for a delinquency charge on any installment not paid in full within ten days after its due date, as originally scheduled or as deferred, in an amount as follows:

2. A delinquency charge under subsection 1 may be collected only once on an installment however long it remains in default. No delinquency charge may be collected with respect to a deferred installment unless the installment is not paid in full within ten days after its deferred due date. A delinquency charge may be collected at the time it accrues or at any time afterward.

3. A delinquency charge shall not be collected under subsection 1, paragraph “a”, on an installment that is paid in full within ten days after its scheduled or deferred installment due date even though an earlier maturing installment or a delinquency or deferral charge on an earlier installment may not have been paid in full. For purposes of this subsection, payments associated with a precomputed transaction are applied first to current installments and then to delinquent installments.

4. With respect to open-end credit, the parties may contract for a delinquency charge on any payment not paid in full when due, as originally scheduled or as deferred, in an amount up to thirty dollars.

5. A delinquency charge under subsection 4 may be collected only once on a payment however long it remains in default. A delinquency charge shall not be collected with respect to a deferred payment unless the payment is not paid in full on or before its deferred due date. A delinquency charge may be collected at the time it accrues or at any time afterward.

6. A delinquency charge shall not be collected under subsection 4 on a payment associated with a precomputed transaction that is paid in full on or before its scheduled or deferred due date even though an earlier maturing payment or a delinquency or deferred charge on an earlier payment has not been paid in full. For purposes of this subsection, payments are applied first to amounts due for the current billing cycle and then to delinquent payments.