The least expensive way to complete and file prior tax year returns for the state of Michigan is go to the state website to get the forms, schedules and instructions for each tax year. Complete each tax year manually, sign, date and mail the returns to the state using a separate envelope for each tax year.
Michigan website for tax forms - https://www.michigan.gov/taxes/0,1607,7-238-44143---,00.html
Otherwise -
If you used TurboTax to file the federal tax return and used the Free online editions then you would need to purchase, download and install on a personal computer one of the desktop editions for each tax year needed, 2015 thru 2017, from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
Download the TurboTax online tax data file from the online tax return using this procedure -
To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download .tax file
Start the TurboTax program for the tax year needed and then click on the File menu at the top left of the program screen. Click on Open Tax Return. Browse to the location for the tax data file that was downloaded.
Download the state program by clicking on Online at the top of the program screen. Click on Download State. Complete the state return. The state return can only be printed and mailed, it cannot be e-filed. Print, sign, date and mail the state return to the state to include all forms W-2 and 1099 for each tax year that has taxes withheld.
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See this TurboTax support FAQ for when access to prior year online tax returns expire - https://ttlc.intuit.com/community/prior-year-return/help/when-does-access-to-my-prior-year-turbotax-...
In TurboTax Free Edition, you can purchase PLUS to unlock your prior-year .tax file.
The exact instructions will vary depending on the status of your 2018 TurboTax Online return (select one):
