Indiana Code Title 6. Taxation § 6-1.1-15-12.1

Sec. 12.1. (a) A county auditor shall correct errors in conformity with a determination of an appeal by the county board, the board of tax review, the department of local government finance, or a court, or in conformity with a settlement or a stipulation.

(b) Upon discovery, a county auditor is authorized to correct errors discovered by the county auditor regarding the description of the property or the identity of the taxpayer.

(c) Upon discovery, and subject to subsection (e), a county auditor may correct errors regarding a tax cap, credit, exemption, or deduction.

(d) Upon discovery, a county auditor may correct errors regarding the computation of taxes, penalties, delinquent taxes carried forward, or an overpayment, if approved by the county treasurer.

(e) If the tax cap, credit, exemption, or deduction is based on a determination by the department of local government finance, a county auditor may correct errors regarding the tax cap, credit, exemption, or deduction, if approved by the department of local government finance.

(f) A county auditor shall notify the taxpayer of a correction of error under subsections (b), (c), and (d).  If the correction of error results in a refund, the refund shall be applied under IC 6-1.1-26.

(g) A taxpayer may challenge a county auditor's action under subsection (b) or (c) under section 1.1 of this chapter.  A taxpayer may challenge a county auditor's action under subsection (d) as an overpayment under IC 6-1.1-26.

(h) Except in accordance with subsection (a), an error corrected under this section may not be applied to tax years earlier than the immediate three (3) prior years.