If you need to make a correction to your return, file an Amended Michigan Individual Income Tax Return (MI-1040X-12). If you are due a refund on your amended return, you must file it within four years of the due date of the original return.
If a change on your federal return affects Michigan taxable income, you must file MI-1040X-12 within 120 days of the change. Include payment of any tax and interest due.
To amend only a homestead property tax or home heating tax credit, file a revised claim form clearly marked "Amended". Do not file MI-1040X-12.
You must paper file any amended returns.