To amend your return you must file an IA 1040 and include an IA 102 Iowa Amended Return Schedule.
Amended returns may be submitted electronically. Check with your software vendor regarding whether filing an amended return electronically is supported. Amended returns should not be submitted on the same day as the original return. To correct errors or misstatements on your original filing, you must submit an IA 1040 with an IA 102. Include an explanation of the changes. If you file an amended federal return, include the federal 1040X with your submission.
If you owe additional tax:
Calculate the tax, and any penalty and interest due. You may make your payment online for the current year or pay with a credit card. To pay by check or money order, print an IA 1040XV payment voucher to send in with your check. order, print an IA 1040XV payment voucher to send in with your check. Visit EasyPay Iowa for more information about your payment options.