Iowa tax deadlines (2026 tax year)
For returns filed in 2027. Different year? See Iowa 2025 deadlines →
Iowa state deadlines (2026 tax year)
| Individual return (filing) | April 30, 2027 |
|---|---|
| Extended filing deadline | October 31, 2027 |
| Estimated payments | April 30 · June 30 · September 30 · January 31 |
Individual returns are due April 30 (not April 15). Automatic extension to October 31 if at least 90% of tax is paid by April 30. Estimated installments fall at quarter-end: April 30, June 30, September 30, January 31.
Federal deadlines that still apply (2026 tax year)
| Individual (Form 1040) | April 15, 2027 · extension October 15, 2027 |
|---|---|
| S-corp (1120-S) & partnership (1065) | March 15, 2027 |
| C-corp (Form 1120) | April 15, 2027 |
| Estimated payments | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Frequently asked questions
When are Iowa state taxes due for the 2026 tax year?
Iowa individual income tax returns for 2026 are due April 30, 2027. 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 October 31, but any tax owed is still due on the original date.
Does a Iowa 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 30, 2027.
When are Iowa estimated tax payments due?
Quarterly estimated payments are generally due April 30, June 30, September 30, January 31. Confirm the current-year dates with the Iowa Department of Revenue.
Dates are the standard statutory deadlines for the 2026 tax year and move to the next business day when they fall on a weekend or holiday. Always confirm the current dates with the Iowa Department of Revenue or the IRS. This is general information, not tax advice.