Ind. Code § 6-8.1-9-1
(a) If a person has paid more tax than the person determines is legally due for a particular taxable period, the person may file a claim for a refund with the department. Except as provided in subsections (j) and (k), in order to obtain the refund, the person must file the claim with the department within three (3) years after the latter of the following:
(2) The date of payment.
For purposes of this section, the due date for a return filed for the state gross retail or use tax, the gasoline tax, the special fuel tax, the motor carrier fuel tax, the oil inspection fee, or the petroleum severance tax is the end of the calendar year which contains the taxable period for which the return is filed. The claim must set forth the amount of the refund to which the person is entitled and the reasons that the person is entitled to the refund.
(h) If the person disagrees with any part of the department's decision, the person may appeal the decision, regardless of whether or not the person protested the tax payment or whether or not the person has accepted a refund. The person must file the appeal with the tax court. The tax court does not have jurisdiction to hear a refund appeal if:
(1) the appeal is filed more than ninety (90) days after the later of the dates on which:
(2) the appeal is filed both before the decision is issued and before the one hundred eighty-first day after the date the person files the claim for a refund with the department.
The ninety (90) day period may be extended according to the terms of a written agreement signed by both the department and the person. The agreement must specify a date upon which the extension will terminate and include a statement that the person agrees to preserve the person's records until that specified termination date. The specified termination date agreed upon under this subsection may not be more than ninety
(j) If a taxpayer's federal taxable income, federal adjusted gross income, or federal income tax liability for a taxable year is modified by the Internal Revenue Service, and the modification would result in a reduction of the tax legally due, the due date by which the taxpayer must file a claim for refund with the department is the later of:
(2) the date that is one hundred eighty (180) days after the date of the modification by the Internal Revenue Service as provided under:
(k) If an agreement to extend the assessment time period is entered into under IC 6-8.1-5-2 (h), the period during which a person may file a claim for a refund under subsection (a) is extended to the same date to which the assessment time period is extended.
As added by Acts 1980, P.L.61, SEC.1. Amended by P.L.291-1985, SEC.12; P.L.335-1989(ss), SEC.22; P.L.71-1993, SEC.25; P.L.119-1998, SEC.19; P.L.98-2004, SEC.74; P.L.2-2005, SEC.22; P.L.211-2007, SEC.42; P.L.131-2008, SEC.30; P.L.182-2009(ss), SEC.256; P.L.172-2011, SEC.89; P.L.137-2012, SEC.109; P.L.242-2015, SEC.39; P.L.256-2017, SEC.88.