You'll need to revisit the Michigan state tax interview. Follow the steps below to change your overpayment option for 2016. (Click the screenshot below for reference.)
Open (continue) your return in TurboTax Online. (If your return isn't open, you'll need to sign in and click Take me to my return.)
Click the State Taxes tab (top center of your screen).
Let's get your state taxes done right. Click Continue.
Status of your state returns. Click Edit next to Michigan.
Your 2016 Michigan taxes are ready for us to check. Scroll down and click Edit next to Other Situations.
A few things before we wrap up your state taxes. Scroll down and click Revisit next to Overpayment Options.
Select Overpayment Option for 2016. Select an option and click Continue.
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.