Understanding Your Assessment

Illinois law requires that the estimated property value and assessed valuation of your property be periodically updated for real estate tax purposes. In Cook County, this general reassessment is done every three years.

Property Value and Assessed Valuation

The estimated value of your property is determined by analyzing sales information of similar homes in your area.

Your Assessed Valuation and Property Taxes

The overall amount of real estate taxes to be collected in your community is determined, not by the Assessor nor any single government official, but by all local governments providing services in your community, such as your municipality, school, park and library districts. That is why it is important to be aware of any proposed increases in spending by your local governments. On the other hand, the assessed valuation of your property does determine your share of those taxes. It is important, therefore, to you and to our office, that your assessed valuation be accurate and fair.

Appealing Your Assessment

You should consider filing an appeal  with the Assessor's Office if you think your new proposed assessed valuation is too high compared to similar properties in your area. You may also file an appeal if you believe that there is an error in the description of your property. However, a minor error does not necessarily indicate an incorrect assessment.

You can find the reassessments of other homes in your neighborhood in the newspaper publication indicated on your reassessment notice. In addition, our office will provide computer printouts of data for similar homes in your area for you to review as comparison properties. Data on sales of comparable homes is also available.

You do not need an attorney or a tax representative to file an appeal. Personal assistance and information, including forms and specific guidelines for filing appeals, are available from our Taxpayer Services Department.In the suburbs, assistance is also available from the local township assessor.

If you do wish to file an appeal with the Assessor's Office, you must do so by the date noted on your reassessment notice. After the Assessor's filing period for appeals  has passed, you will have an additional opportunity to file an appeal with the Cook County Board of Review.