If your state tax returns have already been Accepted, you will need print and mail MI-1040CR-7.
Per the 2017 MI-1040 Individual Income Tax Forms and Instructions:
"Schedules received alone. Only the MI-1040, MI-1040CR, MI-104CR-2 and MI-1040CR-7 forms may be filed alone. All other forms must be filed with a completed MI-1040."
If your state tax returns have already been Accepted, you will need print and mail MI-1040CR-7.
Per the 2017 MI-1040 Individual Income Tax Forms and Instructions:
"Schedules received alone. Only the MI-1040, MI-1040CR, MI-104CR-2 and MI-1040CR-7 forms may be filed alone. All other forms must be filed with a completed MI-1040."
What if my states were started but never declined or accepted. Where would you attach the form Mi-1040cr-7 to?
TurboTax will include a Home Heating Credit for you when you file your Michigan state return;
HOWEVER, the Form will not be updated and ready to be filed with your return until Feb. 6th.
What do I do if i received a letter after my state was accepted that I didn't qualify for home heat credit? Paper has since been disappeared
Please see this Turbo Tax FAQ on when to amend. https://ttlc.intuit.com/community/amending/help/do-i-need-to-amend/00/27607