In this case you will have to file a Illinois state income tax return to collect any taxes that were taken by Illinois.
In the return it will ask how much money was earned in each state. The personal information section in TurboTax will ask if you made money in another state and you will answer Yes and select Illinois.
Iowa and Illinois have a reciprocal agreement for individual income tax purposes. At this time, Iowa's only income tax reciprocal agreement is with Illinois. Any wages or salary made by an Iowa resident working in Illinois is taxable only to Iowa and not to Illinois.
