From michigan.gov: "What should I do if I did not include my Schedule W or W-2s when I filed my paper return?
There is no action you need to take at this time. If additional information is needed, you will be contacted by mail. In the future, when preparing your return, enter your W-2, 1099 and/or MI-4919 information on the Schedule W . A Schedule W is required with each return."
