How Do I Appeal a Property Assessment in Cook County, Illinois?

by Eli McCormack ; Updated July 27, 2017
Property taxes are the key source of funding for most public schools in Illinois.

Items you will need

  • Internet access or printed appeal form(s) for your property type
  • Property Identification Number

No one likes paying property taxes, but it's even worse to pay too much property tax. In Cook County, Illinois, the assessor's office determines the assessed value of your property. This value is then used to determine how much you owe to the taxing bodies to which you are responsible. Though the assessor's office does not control the tax rates imposed by the county, city, township or schools, the assessment of your property is key in determining the amount of taxes owed. An accurate assessment is important, and property owners should be aware of how to file a property assessment appeal.

Step 1

Determine the type of property you own. Cook County classifies property in five categories for property tax assessment: vacant land, residential, apartment buildings with more than six units, not-for-profit and industrial/commercial. To appeal to the property tax assessment, you must first determine which category applies to your property. Each category of land has a different appeal form. Residential is the broadest category. All single-family homes and multifamily homes with six or fewer units are in the residential category.

Step 2

Determine which type of appeal applies to your property assessment. People commonly apppeal a property assessment for one of three reasons. The first is a "uniformity appeal," in which your property is not valued similarly to comparable properties in your area. The second is an "overvaluation appeal," in which you feel that your property assessment reflects an inflated valuation of your property. The third is a "property description error appeal." In this type of appeal, a part of the description used to calculate the property's assessed value is incorrect. For example, the square footage is different from what is recorded in the assessor's office. This difference, if significant, could affect property values.

Step 3

Complete and submit the required forms. The exact form(s) required will depend on the type of property. The Cook County Assessor's Office offers several options for filing an appeal. Its website (see Resources) has the required forms for download. Each assessor's office provides experienced personnel to assist you in filing your appeal and obtaining the proper forms. Appeal forms are also available by mail. To request the forms by mail, call or write to the Cook County Assessor at 118 N. Clark St., Chicago, IL 60602.

Property owners will receive a revaluation notice of their property every three years. Any owner wishing to file an appeal must do so within 30 calendar days of his assessed valuation notice. The notice indicates the last acceptable date to file an appeal. Any required documentation must be filed by the documentation deadline, which is about two weeks after the appeal deadline. Property owners may appeal their property tax assessment in between the years in which they receive an assessment. This is especially important if property or home prices for comparable properties have changed dramatically since the last assessment.

Step 4

Decide to accept the outcome of your appeal or take it to the Cook County Board of Review. Once your appeal has been filed and any required documentation have been received, the assessor's office will review your information and mail you the result of your appeal.

If you have questions about the results of the appeal, you can call and speak to the taxpayer advocate, who can explain the results and answer questions. If you are unsatisfied with the outcome of your appeal, you can take your appeal to the next level through the Cook County Board of Review. The Board of Review can be contacted by calling .


About the Author

Eli McCormack has been writing professionally since 2005. McCormack began her writing career working for her local newspaper, "The Examiner," by covering local government stories. McCormack holds a Bachelor of Science in political science and Latin American studies from DePaul University and a Master of Arts in public administration from Northern Illinois University.

Photo Credits

  • tax defined image by Christopher Walker from
Cite this Article | A tool to create a citation to reference this article Cite this Article

Related pages

ebt mnfers pension formuladebt forgiveness definitionquicken checkbook registerbalanced federal budget pros and consdebt to income ratio for auto loanw4 allowance worksheetlegal ways to break apartment leasecook county quit claim deed form201-601-4100lift chair medicare reimbursementhow to buy abandoned propertycan you buy western union with a credit carddoes medicaid cover braces for adultswells fargo custom cards401k cash out tax formwho is the grantor on a deedssi benefits in californiaboa prepaid debit cardfederal form 1040xquit claim deed illinoisminors filing taxesbond funds vs stock fundsmass dor webfile for incomebonds payable balance sheetcalculate lottery payoutwhat is the difference between injured spouse and innocent spousefeea scholarshipfreddie mac modificationdental assistant scholarshipswww compass ga gov mycompass accountsingle mother housing loanstypical condo association feesquit claim deed illinoislaundry tax deductionhow to cash in a savings bondvertical analysis of financial statements examplehow to sell shares on etradeis certified check same as cashiers checkis a lump sum pension taxabledefine cash flow hedgeupcoming dividend stockscalculate prorated rentoutstanding transaction definitioncar insurance for elderly driverscar insurance for elderly driversgetting a car loan after repossessionis it against the law to add gratuitybank account pending transactionshow often do credit bureaus update scoresinitial outlaypreferred stock accretionhow to calculate average common stockholders equitypowerball payout annuityfannie mae homepath mortgage financingtermination of tenancywhat does cosign meanmerge credit cardsgoing public advantages and disadvantagesdoes auto insurance cover vandalismcar loan defermentkeogh plan contributionlife insurance taxed to beneficiariescashing us postal money ordercredit limit loweredfha builder certificationcalculate ytm of bondinsurable interest life insurance beneficiarywhat does georgia medicaid coverfers minimum retirement agewells fargo dollar to euro exchange ratemd state income tax refundagi vs magifed withholding percentagehow to qualify for ahcccshow long does eviction stay on recordnorth dakota sales tax returnexpected return using capmkohls most valued customerkmart share pricedividend rate vs apy