The IA 126 is to target and tax only your IA income.
You have to prepare the nonresident return first to create a tax liability. Then the resident state can give you a credit. Prepared in the wrong order, you would be missing a credit and will want to file an amended return to get full credit.
If IA taxed more than just your IA income, or none at all, you need to amend IA.
If AR did not give you proper credit for tax paid to IA, you need to amend AR.
Don't amend until the original are settled. Make a copy of the originals before amending.
When you go through IA as a nonresident, it shows you each income and you select if it is IA source. Your rental income would show up on the screen after the wages. It says Rents, Royalties, Partnerships, etc. Enter your IA rental profit/ loss from sch E.
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