It will be listed on your wife's W-2. Look toward the bottom of the form. State taxes begin in Box 15.
For this year, you would enter Wisconsin in TurboTax as a nonresident. Then, enter Michigan.
You would follow the prompts through the program. When you are answering the Michigan interview, expect there to be questions toward the end of the interview about taxes paid to any other states.
Answering these questions should give you a credit in Michigan.
However, since the states have reciprocity and therefore no tax should have gone to Wisconsin, you may run into more questions through the interview. If you do, post on this thread and tag me. I can help more.
Alternatively, you could tell the employer to issue acorrected W-2 and wait to get the corrected W-2 before filing.
