The Michigan website says:
How do I file a Home Heating Credit MI-1040CR-7?
If you are required to file a Michigan Individual Income Tax MI-1040 submit the Home Heating Credit Claim MI-1040CR-7 with your MI-1040. If you are not required to file an MI-1040, you may file your Home Heating Credit Claim by submitting form MI-1040CR-7 only. The due date for filing a Home Heating Credit Claim is September 30.
You should include a paper copy of your Michigan MI-1040 return when you send it, so they can refer to the household income numbers.
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