Ind. Code § 6-2.5-14-2

Sec. 2. The time in which a voluntary payment of tax liability may be made (or the taxpayer may enter into a payment program acceptable to the department for the payment of the unpaid use taxes in full in the manner and time established in a written payment program agreement between the department and the taxpayer) under the amnesty program is limited to the period ending before January 1, 2014.