Michigan property tax appeal deadlines
In Michigan, you typically must file your appeal by July 31 of the tax year (or within 35 days of denial by assessor). Miss this window and you generally lose your appeal rights for the year — you'll have to wait until the next assessment cycle.
The appeal is filed with the Michigan Tax Tribunal. The exact filing procedure varies by county within Michigan, but most allow online or mail-in filing with a small fee or no fee.