An extension to file is not an extension to pay tax.
Iowa grants an automatic 6-month extension with no application at all, as long as at least 90% of the total tax due is paid (through withholding, estimated payments, or other credits) by the original due date. There is no extension request to file - the Department simply treats a taxpayer who meets the 90% test as having one.
| Item | Detail |
|---|---|
| Form required | None - the extension is automatic if the 90% payment test is met |
| Extension length | Up to 6 months, to October 31, 2026 for calendar-year filers |
| Payment threshold | At least 90% of the tax required to be shown on the return, from withholding, estimated payments, and other credits, paid by the original due date; interest still accrues on any unpaid balance |
| Authority | Iowa Code §422.21; Iowa Admin. Code r. 701-700.5 (extension of time to file) |