Not tax advice. This site gives general information and rough estimates only. It is not tax, legal or accounting advice and does not create a preparer relationship. Rules and your situation vary. Check the linked official sources or ask a licensed tax professional before you pay or file.
Iowa estimated tax due dates (2026 tax year)
| Payment | Due |
|---|---|
| 1 | Apr 30, 2026 |
| 2 | Jun 30, 2026 |
| 3 | Sep 30, 2026 |
| 4 | Jan 31, 2027 |
Form/payment: Form IA 1040ES
Iowa uses month-end dates. Threshold is $1,000 of tax on non-withheld income for tax years beginning on/after Jan 1, 2026 (was $200). Jan 31, 2027 is a Sunday, so the next business day applies.
Source: Iowa tax agency page · last verified 2026-10-17
Federal dates are separate: Apr 15, Jun 15, Sep 15, 2026 and Jan 15, 2027 (federal page). Weekend or holiday dates generally move to the next business day.