Illinois property tax appeal guide
AppealTax can help review your assessment, identify errors, organize comparable sales, and prepare a clearer challenge before the local appeal window closes.
Start by checking your Notice of Valuation and gathering your county property record.
Illinois County Guides
Select your county or county-equivalent below for local property tax appeal guidance, basic deadline context, assessment-review steps, and residential tax-bill benchmarks.
Alexander County
Bond County
Boone County
Brown County
Bureau County
Calhoun County
Carroll County
Cass County
Champaign County
Christian County
Clark County
Clay County
Clinton County
Coles County
Cook County
Crawford County
Cumberland County
DeKalb County
De Witt County
Douglas County
DuPage County
Edgar County
Edwards County
Effingham County
Fayette County
Ford County
Franklin County
Fulton County
Gallatin County
Greene County
Grundy County
Hamilton County
Hancock County
Hardin County
Henderson County
Henry County
Iroquois County
Jackson County
Jasper County
Jefferson County
Jersey County
Jo Daviess County
Johnson County
Kane County
Kankakee County
Kendall County
Knox County
Lake County
LaSalle County
Lawrence County
Lee County
Livingston County
Logan County
McDonough County
McHenry County
McLean County
Macon County
Macoupin County
Madison County
Marion County
Marshall County
Mason County
Massac County
Menard County
Mercer County
Monroe County
Montgomery County
Morgan County
Moultrie County
Ogle County
Peoria County
Perry County
Piatt County
Pike County
Pope County
Pulaski County
Putnam County
Randolph County
Richland County
Rock Island County
St. Clair County
Saline County
Sangamon County
Schuyler County
Scott County
Shelby County
Stark County
Stephenson County
Tazewell County
Union County
Vermilion County
Wabash County
Warren County
Washington County
Wayne County
White County
Whiteside County
Will County
Williamson County
Winnebago County
Woodford County
Statewide Residential Benchmark
A broad statewide benchmark for Illinois is an effective property tax rate of about 1.73% of home value. On a $400,000 residential property, that equals about $6,920 per year. This is a statewide comparison point, not a guarantee of what any parcel will owe.
Basic statewide deadlines
Illinois appeal windows move fast
Illinois assessment complaint deadlines vary by county and township; many are due about 30 days after assessment publication.
Start by checking your Notice of Valuation and gathering your county property record.
Then confirm the current year’s instructions with your county assessor, local board, municipality, or state tax authority, especially if a deadline falls on a weekend or legal holiday.
Common questions
When is the Illinois property tax appeal deadline?
Illinois assessment complaint deadlines vary by county and township; many are due about 30 days after assessment publication. Confirm the exact current-year deadline with your local assessing office.
What should I gather first?
Gather your assessment notice, property record card, tax bill, exemption information, photos, repair estimates, and comparable sales.
Can AppealTax help with a Illinois assessment review?
AppealTax can help review your assessment, identify errors, organize comparable sales, and prepare a clearer challenge before the appeal window closes.