The Department does not have an extension form to obtain additional time to file. A federal extension does not apply for Iowa purposes.
If at least 90% of your total tax liability is paid by April 30, 2019, you will automatically have an additional six months to file your return. You have until October 31, 2019, to file your return timely. You will not be charged a late file penalty. However, you may owe an IA 2210 penalty for failure to make estimated payments. You will owe interest on any tax still due after April 30.
How to determine if 90% of the tax you owe has already been paid:
Multiply the amount on line 56 of the IA 1040 by 90% (0.90).
If the result is equal to or less than the amount on line 66 of the IA 1040, an extension is automatic.
Line 56 = $5,000
$5,000 x 90% = $4,500
Line 66 = $4,000
90% of the tax has not been paid. No extension is available to this taxpayer. This taxpayer will owe penalty and interest on the unpaid tax.
Line 56 = $3,000
$3,000 x 90% = $2,700
Line 66 = $2,850
This taxpayer receives an automatic extension until October 31, 2019 and will pay only interest on the unpaid tax.
If you need to make a tax payment to meet the 90% requirement, you may: