Indiana tax deadlines in 2026: filing dates and estimated payments
Deadlines that fall in calendar 2026: the 2025 return and the 2026 estimated payments. Different year? See Indiana 2025 →
Indiana deadlines in 2026
| 2025 individual return due | April 15, 2026 |
|---|---|
| Extended filing deadline | November 16, 2026 |
| Payment due | April 15, 2026, extension or not |
| Final 2025 estimated payment | January 15, 2026 |
| 2026 estimated payments | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Individual returns are due April 15. With a valid federal extension, Indiana grants an automatic extension of about a month past the federal October 15 deadline; for the 2025 tax year the Indiana extended filing deadline is November 16, 2026. Payment is still due April 15; pay at least 90% to avoid penalty.
Indiana estimated tax payments in 2026
You owe $1,000 or more in state and county tax for the year that is not covered by withholding.
| Q1 (2026 tax year) | April 15, 2026 |
|---|---|
| Q2 (2026 tax year) | June 15, 2026 |
| Q3 (2026 tax year) | September 15, 2026 |
| Q4 (2026 tax year) | January 15, 2027 |
| Voucher | Form ES-40 |
| Underpayment safe harbor | Credits including estimated payments must be at least 90% of this year's tax or 100% of last year's tax (110% of last year's tax if federal AGI exceeds $150,000 single or joint, $75,000 married filing separately). |
| Pay online | intime.dor.in.gov |
Four installments; if the due date falls on a national or state holiday, Saturday or Sunday, pay online or postmark by the next business day. Penalty is 10% of the underpayment for each installment period, computed on Schedule IT-2210 (or IT-2210A annualized). Farmers/fishermen (2/3 of gross income) see Information Bulletin #3. DOR page is undated (generic schedule, not year-specific).
Source: in.gov, read September 3, 2026. “Estimated tax installment payments are due on or before: April 15 June 15 Sept. 15 Jan. 15 of the following year”
All 51 jurisdictions in one table: state estimated tax payment dates for 2026.
Indiana extensions
Every state's rule in one table: which states accept the federal extension in 2026.
| Does Indiana accept the federal extension? | Yes. A federal extension is honored; no state form. |
|---|---|
| State extension form | Form IT-9 |
| Original due date | April 15, 2026 |
| Extended due date | November 16, 2026 |
| Payment | Still due April 15, 2026. The extension is to file, not to pay. Interest is added to any amount owed after April 15, 2026; penalty is waived if at least 90% is paid by April 15 and the balance is paid by November 16, 2026. |
| How to get it | If you have a federal extension you automatically have an Indiana extension; otherwise request one online via INTIME or mail Form IT-9 by April 15. |
Indiana's extension runs one month past the federal extended date; the Department publishes November 16, 2026 as the extended deadline for returns filed in 2026.
Source: in.gov, read September 3, 2026. “If you have a federal extension of time to file, you automatically have an extension with Indiana.”
Federal deadlines in 2026
| 2025 Form 1040 | April 15, 2026 · extension October 15, 2026 |
|---|---|
| 2025 S-corp (1120-S) & partnership (1065) | March 16, 2026 |
| 2025 C-corp (Form 1120) | April 15, 2026 |
| 2026 federal estimated payments (1040-ES) | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Source: IRS Publication 509 and Form 1040-ES instructions, irs.gov.
Frequently asked questions
When are Indiana state taxes due in 2026?
Your 2025 Indiana individual income tax return is due April 15, 2026. If that date falls on a weekend or legal holiday, the deadline moves to the next business day. An extension moves the filing deadline to November 16, 2026, but any tax owed is still due on the original date.
When are Indiana estimated tax payments due in 2026?
Indiana estimated payments for the 2026 tax year are due April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027. Use Form ES-40 or pay online. The final installment for 2025 was due January 15, 2026.
Does Indiana accept the federal extension?
Yes. A federal extension is honored; no state form. The state form is Form IT-9. The extended filing deadline is November 16, 2026, and tax is still due by April 15, 2026.
Does a Indiana extension give me more time to pay?
No. An extension extends the time to file, not to pay. To avoid penalties and interest, pay what you expect to owe by April 15, 2026.
Dates are the statutory deadlines that fall in 2026 and move to the next business day when they land on a weekend or holiday. Each section links to the source it was checked against. Always confirm with the Indiana tax agency or the IRS before relying on a date. This is general information, not tax advice.