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.

Deadline

Type

Description

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

Indiana Income Tax Extension Details

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 eFile.com.

As soon as possible

Tax Amendment for all Tax Years

Detailed Instructions on how to prepare and mail in an Indiana State Income Tax Return Amendment.

IRS Due Dates

IRS Tax Return, Extension, Amendment Deadlines

Detailed current and future Federal or IRS Income Tax 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

Current year income tax return 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.

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