When is the Indiana property tax appeal deadline?

Indiana uses a June 15 appeal deadline that keys off when your Form 11 Notice of Assessment was mailed.

The standard rule. If the county mailed your Form 11 before May 1 of the assessment year, you must file your appeal by June 15 of that assessment year. If the Form 11 is mailed on or after May 1, the deadline shifts to June 15 of the year the tax statements are mailed. This framework is set by Ind. Code §6-1.1-15-1.1.

You start an appeal with Form 130. File the Taxpayer's Notice to Initiate an Appeal (Form 130, State Form 53958) with your local assessing official (township or county assessor) or county auditor. You do not need to wait for anything beyond your Form 11 — and you can initiate an appeal under the same June 15 framework even if no Form 11 was issued.

Assessment date. Indiana assesses property as of the January 1 assessment date, so your appeal challenges the value assigned for that year.

Why the deadline matters. Missing it generally means accepting your assessed value for the year. Confirm the exact date on your own Form 11 — the printed notice controls.

Before you file, know this. In Indiana the Property Tax Assessment Board of Appeals (PTABOA) can adjust your value in either direction once you appeal — it can be lowered, left the same, or raised. File only when comparable-sales evidence clearly supports a lower value.