Indiana Code Title 31. Family Law and Juvenile Law § 31-16-12-2

Sec. 2. The court may, upon a request by the person or agency entitled to receive child support payments, order interest charges of not more than one and one-half percent (1 1/2 %) per month to be paid on any delinquent child support payment.  The person or agency may apply for interest if support payments are not made in accordance with the support order.  Accrued interest charges may be collected in the same manner as support payments under IC 31-16-9.