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.

IN Tax Deadlines

Tax Day, April 15
IRS and State Income Tax Return
Prepare and e-file IRS your Indiana income tax returns by this timely date - eFileIT.
Tax Day, April 15
Income Tax Extension
October 15
Individual Income Tax Return After the April Tax Day deadline
This is the last day to e-file an Indiana state income tax return for extension filers and late filers. You can only e-file your Indiana return together with your IRS returneFileIT. To file by paper, see below.
Oct. 15 via Nail-In Forms.
Individual Income Tax Return after the Deadline
This is the deadline for taxpayers who got an IN tax extension to file their Indiana return by mail. See instructions on how to only - without the IRS return - prepare and file an Indiana 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
This is the last day to file - you will not face late filing penalties - and claim your Indiana tax refund. This deadline does not apply if you owe income taxes.