Indiana Income Tax Filing Deadlines by Tax Year

The majority of deadlines listed here are for the current tax year. Some apply to upcoming tax years and some are IRS or federal deadlines. Note that the April 15 and October 15 filing deadlines vary by year but are generally on or around the 15th of these months. The links pages will have the latest updates.

Tax Day, April 15
IRS and State Income Tax Return
Prepare and e-File an IRS and Indiana State Income Tax Return by this timely date. - eFileIT
Tax Day, April 15
Income Tax Extension
October 15
Individual income tax return after the April Tax Day deadline
Last day to e-File an Indiana State Income Tax Return for Tax Extension Filers and late eFilers. You can only e-File (to file by paper see below) Indiana Income Tax Return together with an IRS Tax Return. eFileIT
Oct. 15 via mail-in Forms.
Forms incl. Mailing Address are listed below.
Individual Income Tax Return after the Deadline
Deadline for taxpayers who got an IN Tax Extension to file their Indiana Income Tax Return by mail-in Forms - the Forms incl. mailing addresses are listed below. Instructions on how to only - without the IRS return - prepare and file an Indiana State Income Tax Return on
As soon as possible
Tax Amendment for all Tax Years
IRS Due Dates
IRS Tax Return, Extension, Amendment Deadlines
All Deadlines and Years
Other State Tax Return, Extension, Amendment Deadlines
Select respective State Tax Return Deadlines.
All Deadlines and Years
IRS Federal Income Tax Return, Amendment, Extension Deadlines
April 15, Three Years Later
Indiana Income Tax Return Refund;
IRS Tax Return Refund Claim Deadline
The last day to file - you will not face late filing penalties - and claim your Indiana Income Tax Return Refund. This deadline does not apply if you owe income taxes.