The general rule is: your report all your income on your home state return, even the income earned out of state. You file a non-resident state return for the state you worked in and pay tax to that state. Your home state will give you a credit, or partial credit, for what you paid the non-resident state.
If IA is the non resident state:
Nonresidents must file an Iowa income tax return (IA 1040) if their net income from Iowa sources is $1,000 or more.
Reference: https://tax.iowa.gov/im-not-iowa-resident
