Indiana Code Title 36. Local Government § 36-9-37-38

Sec. 38. (a) If excess payments have been made and collected on special assessments for public improvements, the municipal fiscal officer shall, not later than thirty (30) days after the discovery of the overpayment, give notice of the amount of the overpayment by mail to the owner of record of the property on which the payment was made.

(b) When the municipal fiscal officer determines the amount of the overpayment and the person or persons to whom the reimbursement should be made, the fiscal officer shall issue a refund of the overpayment to the proper person or persons.