(a) This section applies when:

1. (1) an assessment is made or increased after the date or dates on which the taxes for the year for which the assessment is made were originally due;
2. (2) the assessment upon which a taxpayer has been paying taxes under IC 6-1.1-15-10 (a)(1) or IC 6-1.1-15-10 (a)(2) while a petition for review or a judicial proceeding has been pending is less than the assessment that results from the final determination of the petition for review or judicial proceeding; or
3. (3) the collection of certain ad valorem property taxes has been enjoined under IC 33-26-6-2 , and under the final determination of the petition for judicial review the taxpayer is liable for at least part of those taxes.

(b) Except as provided in subsections (c) and (g), a taxpayer shall pay interest on the taxes the taxpayer is required to pay as a result of an action or a determination described in subsection (a) at the rate established by the commissioner of the department of state revenue under IC 6-8.1-10-1 from the original due date or dates for those taxes to:

1. (1) the date of payment; or

2. (2) the date on which penalties for the late payment of a tax installment may be charged under subsection (e) or (f);

   whichever occurs first. The interest shall be computed using the rate in effect for each particular year in which the interest accrued.

(c) Except as provided in subsection (g), a taxpayer shall pay interest on the taxes the taxpayer is ultimately required to pay in excess of the amount that the taxpayer is required to pay under IC 6-1.1-15-10 (a)(1) while a petition for review or a judicial proceeding has been pending at the overpayment rate established under Section 6621(c)(1) of the Internal Revenue Code in effect on the original due date or dates for those taxes from the original due date or dates for those taxes to:

1. (1) the date of payment; or

2. (2) the date on which penalties for the late payment of a tax installment may be charged under subsection (e) or (f);

   whichever occurs first.

(d) With respect to an action or determination described in subsection (a), the taxpayer shall pay the taxes resulting from that action or determination and the interest prescribed under subsection (b) or (c) on or before:

1. (1) the next May 10; or

2. (2) the next November 10;

   whichever occurs first.

(e) A taxpayer shall begin paying the penalty prescribed in section 10 of this chapter on the day after the date for payment prescribed in subsection (d) if:

1. (1) the taxpayer has not paid the amount of taxes resulting from the action or determination; and

2. (2) the taxpayer either:

   1. (A) received notice of the taxes the taxpayer is required to pay as a result of the action or determination at least thirty (30) days before the date for payment; or
   2. (B) voluntarily signed and filed an assessment return for the taxes.

(f) If subsection (e) does not apply, a taxpayer who has not paid the amount of taxes resulting from the action or determination shall begin paying the penalty prescribed in section 10 of this chapter on:

1. (1) the next May 10 which follows the date for payment prescribed in subsection (d); or

2. (2) the next November 10 which follows the date for payment prescribed in subsection (d);

   whichever occurs first.

(g) A taxpayer is not subject to the payment of interest on real property assessments under subsection (b) or (c) if:

1. (1) an assessment is made or increased after the date or dates on which the taxes for the year for which the assessment is made were due;
2. (2) the assessment or the assessment increase is made as the result of error or neglect by the assessor or by any other official involved with the assessment of property or the collection of property taxes; and

3. (3) the assessment:

   1. (A) would have been made on the normal assessment date if the error or neglect had not occurred; or

   2. (B) increase would have been included in the assessment on the normal annual assessment date if the error or neglect had not occurred.

      [Pre-1975 Property Tax Recodification Citation: 6-1-32-7 part.]

      Formerly: Acts 1975, P.L.47, SEC.1. As amended by Acts 1981, P.L.76, SEC.1; P.L.63-1986, SEC.2; P.L.90-1987, SEC.1; P.L.198-2001, SEC.92; P.L.1-2004, SEC.45 and P.L.23-2004, SEC.48; P.L.67-2006, SEC.10; P.L.219-2007, SEC.81; P.L.1-2010, SEC.33; P.L.56-2012, SEC.16; P.L.120-2012, SEC.5; P.L.235-2013, SEC.3; P.L.288-2013, SEC.24; P.L.251-2015, SEC.31; P.L.232-2017, SEC.38.