Indiana LLC Tax Deadlines 2026
Complete guide to LLC filing dates, extensions, estimated payment schedules, and required forms in Indiana for the 2026 tax year. Indiana imposes a state income tax, so LLC entities must file both federal and state returns.
Indiana LLC filing deadline
Calendar-year due date follows federal timing for pass-through entities.
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: State business income tax return
Estimated payments
No state estimated payment schedule listed.
Due: N/A
Indiana LLC Tax Calendar at a Glance
| Event | Date |
|---|---|
| Filing deadline | Mar 16, 2026 |
| Extension deadline | Sep 15, 2026 |
FAQ
When is the LLC tax filing deadline in Indiana for 2026?
The Indiana LLC tax return is due Mar 16, 2026 for the 2026 tax year. An extension is available until Sep 15, 2026.
Does Indiana require LLC estimated tax payments?
Estimated payments are not typically required at the entity level for LLC in Indiana, but confirm with Indiana Department of Revenue.
What form do I file for a LLC in Indiana?
LLC entities in Indiana file using Form State business income tax return. You can download the form from Indiana Department of Revenue at https://www.in.gov/dor.
Can I get an extension for my Indiana LLC tax return?
Yes. Indiana allows an extension for LLC returns until Sep 15, 2026. Note that an extension gives you more time to file, not more time to pay — any tax owed is still due by the original deadline of Mar 16, 2026.
What are the penalties for filing late in Indiana?
Indiana typically charges a failure-to-file penalty (usually 5% of unpaid tax per month, up to 25%) and a failure-to-pay penalty (usually 0.5-1% per month). Interest also accrues on unpaid balances. Filing for an extension by the original deadline avoids the failure-to-file penalty but not the failure-to-pay penalty.
Where can I file Indiana LLC taxes?
File through Indiana Department of Revenue. Visit https://www.in.gov/dor for e-filing options, downloadable forms, and payment portals.
Indiana Estimated Tax Payments
View the full quarterly estimated payment schedule for Indiana, including all entity types and payment methods.
View Indiana estimated payments →