Indiana Code Title 36. Local Government § 36-2-10-23

Sec. 23. (a) Notwithstanding any other law, payments to the treasurer for any purpose, including property tax payments, may be made by any of the following financial instruments that the treasurer authorizes for use:

(b) If there is a charge to the treasurer for the use of a financial instrument other than a bank card or credit card, the treasurer shall collect a sum equal to the amount of the charge from the person who uses the financial instrument.

(c) A treasurer may contract with a bank card or credit card vendor for acceptance of bank or credit cards. However, if there is a vendor transaction charge or discount fee, whether billed to the treasurer or charged directly to the treasurer's account, the treasurer shall collect from the person using the card an official fee that may not exceed the highest transaction charge or discount fee charged to the treasurer by bank or credit card vendors during the most recent collection period. This fee may be collected regardless of retail merchant agreements between the bank and credit card vendors that may prohibit such a fee. The fee is a permitted additional charge under IC 24-4.5-3-202.

(d) Notwithstanding subsection (a), the authorization of the treasurer is not required for the bureau of motor vehicles or the bureau of motor vehicles commission to use electronic funds transfer or other financial instruments to transfer funds to the county treasurer.