Indiana State Tax Guide
Click your state on the map to see filing deadlines, extension rules, refund tracking, and payment options for that state. States shown in gray are coming soon.
Hover or tab a state to see its name.
Indiana State Tax Guide
Extension rules
Extension type: Automatic with Federal · Form IT-9
If you have been granted a federal extension of time to file with the IRS, you will automatically be granted an extension with Indiana. DOR may also grant extensions for filing and paying certain income tax for those affected by disaster relief. If you have not filed a federal extension, you will need to file Form IT-9 before the tax deadline to receive an extension on your Indiana taxes. You cannot file for an extension after the tax deadline has passed.
If you owe tax: If you owe an income tax liability you must also pay estimated taxes owed and submit Form IT-9. If you owe Indiana state income taxes, you must pay by your filing deadline of April 15th to avoid penalties and interest. To avoid penalties when you owe, you must pay at least 90% of your expected tax liability by the original due date.
If you owe $0: If you have been granted a federal extension of time to file with the IRS, you will automatically be granted an extension with Indiana.
How to request
- Online: If you have been granted a federal extension of time to file with the IRS, you will automatically be granted an extension with Indiana. INTIME
- Mail: If you have not filed a federal extension, you will need to file Form IT-9 before the tax deadline to receive an extension on your Indiana taxes. Form IT-9
File an approved federal extension or submit Form IT-9 by the tax deadline to get a filing extension to November 16, 2026. To avoid penalties when you owe, you must pay at least 90% of your expected tax liability by the original due date. If you owe Indiana state income taxes, you must pay by your filing deadline of April 15th to avoid penalties and interest.
Indiana DOR — File an extension
Relevant Links
Indiana Key deadlines (tax year 2025, return filed in 2026)
- Filing deadline: Apr 15, 2026
- Extension request deadline: Apr 15, 2026 — Original Filing Deadline: April 15, 2026. Extension Request Deadline: April 15, 2026.
- Extended return deadline: Oct 15, 2026 (6-month extension)
- Payment deadline: Apr 15, 2026
- Differs from federal: No
File an approved federal extension or submit Form IT-9 by the tax deadline to get a filing extension to November 16, 2026. To avoid penalties when you owe, you must pay at least 90% of your expected tax liability by the original due date.
If the due date for filing your return falls on a Saturday, Sunday, or legal holiday, your return is due by the next regular working day.
October 15, 2026 (6-month extension)
Relevant Links
Payment rules
If you owe Indiana state income taxes, you must pay by your filing deadline of April 15th to avoid penalties and interest.
Official payment portal
Payment options
Payment plan availability
Available: Yes
The Indiana Department of Revenue (DOR) offers several payment plan options for both individuals and businesses. Generally, the amount of tax due must be more than $100 for individuals or $500 for businesses to establish a payment plan.
Filing forms
Extension
- Form IT-9 - Application for Extension of Time to File · Download form
Indiana Refund Tracking
Processing time: Check Indiana refund status
Relevant Links
Do I need to file?
You need to file a state tax extension if you cannot complete and file your tax return by the April 15th deadline. If you owe an income tax liability you must also pay estimated taxes owed and submit Form IT-9
- Residents: You need to file a state tax extension if you cannot complete and file your tax return by the April 15th deadline. If you owe an income tax liability you must also pay estimated taxes owed and submit Form IT-9
- Part-year residents: You need to file a state tax extension if you cannot complete and file your tax return by the April 15th deadline. If you owe an income tax liability you must also pay estimated taxes owed and submit Form IT-9
- Nonresidents: You need to file a state tax extension if you cannot complete and file your tax return by the April 15th deadline. If you owe an income tax liability you must also pay estimated taxes owed and submit Form IT-9
Indiana DOR — File an extension
Relevant Links
Filing methods
Online filing
If you have been granted a federal extension of time to file with the IRS, you will automatically be granted an extension with Indiana. INTIME
DOR may also grant extensions for filing and paying certain income tax for those affected by disaster relief: Indiana disaster relief notices
Mail filing
If you have not filed a federal extension, you will need to file Form IT-9 before the tax deadline to receive an extension on your Indiana taxes. You cannot file for an extension after the tax deadline has passed.
