look on your W-2 and make useful which state took out taxes. through fact of reciprocity agreements between Illinois and adjoining states mutually with Wisconsin, be attentive to-how which you're an Illinois resident, your organization would desire to have already withheld Illinois taxes. That occurred years interior the previous on an analogous time as i grew to grow to be an Illinois resident working for the summer season in Madison, WI. My company deducted Illinois taxes, so i finished up in simple terms submitting an Illinois tax pass back. however if, in the adventure that your organization withheld WI taxes, then you definately somewhat'd ought to checklist your WI earnings on your Illinois resident IL-1040 (and be taxes for that reason), then checklist a WI-1040 to get an finished refund of your WI withholding.