Iowa Filing Due Date: Corporation income tax returns are due by April 30 — or by the last day of the 4th month following the close of the taxable year (for fiscal year filers).
Extended Deadline with Iowa Tax Extension: Iowa offers a 6-month extension, which moves the filing deadline to October 30 (for calendar year taxpayers).
Iowa Tax Extension Form: The Iowa business extension is automatic, meaning that there’s no application or written request to submit.
Iowa Extension Payment Requirement: An extension of time to file is not an extension of time to pay. If you owe Iowa tax, your balance must be paid by the original due date to avoid penalties and interest. In order to obtain an Iowa extension, at least 90% of your state tax liability must be paid on time. You can make an Iowa extension payment with Form IA 1120V, or pay online using the Iowa eFile & Pay system: efilepay.idr.iowa.gov/iao/welcome
Iowa Tax Extension Tip: If your Iowa tax liability is zero, you will automatically be granted a state tax extension. In this case, you don’t need to do anything to receive an Iowa tax extension.