Iowa tax deadlines in 2027: filing dates and estimated payments
Deadlines that fall in calendar 2027: the 2026 return and the 2027 estimated payments. Different year? See Iowa 2025 →
Iowa deadlines in 2027
| 2026 individual return due | April 30, 2027 |
|---|---|
| Extended filing deadline | October 31, 2027 |
| Payment due | April 30, 2027, extension or not |
| Final 2026 estimated payment | January 31, 2027 |
| 2027 estimated payments | April 30, 2027 · June 30, 2027 · September 30, 2027 · January 31, 2028 |
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.
Iowa estimated tax payments in 2027
Iowa estimated payments for the 2027 tax year follow the standard schedule: April 30, 2027, June 30, 2027, September 30, 2027, January 31, 2028. Confirm the current-year voucher and any state-specific threshold with the Iowa tax agency.
Source: revenue.iowa.gov.
Iowa extensions
An extension moves the Iowa filing deadline to October 31, 2027. It does not move the payment date: pay what you expect to owe by April 30, 2027. Confirm with the Iowa tax agency whether the federal extension is honored automatically or a state form is required.
Federal deadlines in 2027
| 2026 Form 1040 | April 15, 2027 · extension October 15, 2027 |
|---|---|
| 2026 S-corp (1120-S) & partnership (1065) | March 15, 2027 |
| 2026 C-corp (Form 1120) | April 15, 2027 |
| 2027 federal estimated payments (1040-ES) | April 15, 2027 · June 15, 2027 · September 15, 2027 · January 18, 2028 |
Source: IRS Publication 509 and Form 1040-ES instructions, irs.gov.
Frequently asked questions
When are Iowa state taxes due in 2027?
Your 2026 Iowa individual income tax return is 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, 2027, but any tax owed is still due on the original date.
When are Iowa estimated tax payments due in 2027?
Iowa estimated payments for the 2027 tax year are due April 30, 2027, June 30, 2027, September 30, 2027, January 31, 2028. The final installment for 2026 was due January 31, 2027.
Does Iowa accept the federal extension?
An extension moves the Iowa filing deadline to October 31, 2027. It does not extend the time to pay: pay what you expect to owe by April 30, 2027 to avoid penalties and interest.
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.
Dates are the statutory deadlines that fall in 2027 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 Iowa tax agency or the IRS before relying on a date. This is general information, not tax advice.