If you'd like to appeal your Madison County, Illinois home's assessment -- that includes homes in Edwardsville, Glen Carbon, Maryville, Troy, Collinsville, Granite City, etc. -- you only have until September 12, 2011 to get the paperwork and supporting materials to the Madison County Board of Review.
The Madison County Board of Review requires that homeowners who want to file a complaint must fill out a form listing a wide variety of information about the property in question and also submit supporting documents such as comparable sales, or construction cost, or an appraisal or an operating statement for the last two years for income property.
If you've just recently purchased your home, you can include copies of your closing statement showing a value lower than your home's current assessment.
Here's a link to the Madison County, Illinois website from which you can download the Residential Complaint for Assessment Year 2011 form. The form also includes an instruction sheet that will answer many of the questions you might have about the process.
What are grounds for a residential assessment appeal?
According to Madison County, they include: over valuation, unequal treatment in the assessment process, contention of law, property that has been assessed twice in the year or condemnation. There also is a blank for "other" in case your situation is not listed.
If you so desire, you also can tell the county that your assessment is not high enough versus similar properties on the same form. I bet most people aren't rushing to do that.
Good luck with your appeal!