Filing an appeal of a property tax assessment in Michigan is a lengthy process that can take several years to resolve. There are large backlogs of cases pending before the few judges on the Michigan Tax Tribunal. To appeal, property owners must meet filing deadlines of either May 31 or July 31 depending on the property type. A successful appeal will only lower taxes if the property's assessed value is reduced below the taxable value. Preparing a thorough valuation disclosure for a hearing can be an expensive part of the appeal process.