Personal Tax Information:  

If you were approved for a federal tax extension the State of Iowa will automatically grant you a six month tax extension, provided you make any state tax payments due by April 30. If you do need to make a state tax payment, you'll need to submit an Iowa state payment voucher IA-1040V (PDF). Filing for an Iowa tax extension will not grant you extra time to pay any tax balance due. Your balance must be paid by April 30 to avoid possible penalties.

If you already received an approval notification from ExpressExtension, and you don't need to make a tax payment, then you're all done.

For more information, visit the State of Iowa Department of Revenue website.
http://www.iowa.gov/tax/forms/individual.html

Business Tax Information:

The State of Iowa will automatically grant you a 6 month business income tax extension. However, if you need to make a state tax payment, you will need to submit Iowa tax payment voucher Form 1120V (PDF).

If you do not need to make a tax payment and have received an approval notification from ExpressExtension, there’s nothing more to do.

Filing an Iowa tax extension will not provide you with additional time to pay any tax balance due, which must be paid by your original filing deadline or interest and other payment penalties may apply.

For additional information, please visit the State of Iowa Department of Revenue website.
http://www.iowa.gov/tax/business/business.html