Ind. R. App. P. 45

As amended through April 3, 2024
Rule 45 - Time for Filing Briefs
(A) Applicability. This Rule applies to appeals from Final Judgments and interlocutory orders. Filing deadlines relating to Petitions for Rehearing, to Transfer, and for Review are governed by Rules 54, 57 and 63 respectively.
(B) Filing Deadlines.
(1) Appellant's Brief. The appellant's brief shall be filed no later than thirty (30) days after:
(a) the date the trial court clerk or Administrative Agency serves its Notice of Completion of Clerk's Record on the parties pursuant to Appellate Rule 10(C) if the notice reports that the Transcript is complete or that no Transcript has been requested; or
(b) in all other cases, the date the trial court clerk or Administrative Agency serves its Notice of Completion of the Transcript on the parties pursuant to Appellate Rule 10(D). Rule 25(C), which grants a three-day extension of time for service by mail or third-party commercial carrier, does not extend the due date for filing the appellant's brief.
(2) Appellee's Brief. The appellee's brief shall be filed no later than thirty (30) days after service of the appellant's brief.
(3) Appellant's Reply Brief; Cross-Appellee's Brief. Any appellant's reply brief shall be filed no later than fifteen (15) days after service of the appellee's brief. If the reply brief also serves as the cross-appellee's brief, it shall be filed no later than thirty (30) days after service of the appellee's brief.
(4) Cross-Appellant's Reply Brief. Any cross-appellant's reply brief shall be filed no later than fifteen (15) days after service of the appellant's reply brief.
(C) Extensions of Time. Motions for extensions of time to file any briefs are governed by Rule 35.
(D) Failure to File Timely. The appellant's failure to file timely the appellant's brief may subject the appeal to summary dismissal. The appellee's failure to file timely the appellee's brief may result in reversal of the trial court or Administrative Agency on the appellant's showing of prima facie error.

Ind. R. App. P. 45