How To File A Property Tax Appeal In Cook County

Feb. 16, 2021 Property Taxes
Table of Contents


Every year, the Cook County assessor's office releases new property assessments that are used to determine the property tax bill of every home in Cook County. Every year, you have the opportunity to contest those values by filing a property tax appeal, which can lower your property tax assessment, and therefore your property tax bill.

Triennial Reassessment Period

The Cook County Assessor only releases new assessments for 1/3rd of the city each year. The properties that will be reassessed for the next three years are:

  • 2021: Chicago City
  • 2022: North Suburbs
  • 2023: South Suburbs
You can check when your home will be next reassessed by searching your address here.

If my home isn't getting reassessed should I still file a property tax appeal?

Yes! Just because your home isn't getting a new assessment, doesn't mean that you can't file an appeal. Filing an appeal is risk-free, and we often see homes get reductions in their second and third year of the reassessment cycle.

Should I still file an appeal even if my appeal won last year?

Yes! Your home might be completely reassessed next year depending upon where you live. And even if it isn't, we often see home's with successful appeals multiple years in a row.

Appealing to the Assessor's Office

You can file your own appeal to the assessor's office, or hire a firm like TaxProper to do this for you.

Step 1: Identifying your PIN

The first step to filing an appeal is figuring out which property you want to file an appeal for.
In Cook County, properties are identified by their PIN's (Property Index Number). Every property in Cook County has a PIN, which is a 14 digit number. You can find your pin on your tax bill, or by searching here.

Step 2: Is it time to file your appeal?

The assessor's office accepts appeals on a rolling basis. Every Township has a 6-week rolling window, where appeals can be filed.
You can check the specific dates for when each Township starts and stops accepting appeals here.

Step 3: Compile your evidence

By filing a property tax appeal, you are arguing that your property is overassessed. That means you need to provide proof to the Assessor's office that your home's assessment is higher than the fair market value of your home, or higher than other assessments in your area. You can argue this in multiple ways:

  • Uniformity assessment argument: identify similar homes in your neighborhood that are assessed for a lower amount than yours
  • Comparable sales argument: identify recent sales homes in your neighborhood that sold for less than your home, implying the market value is less than your assessment
Remember, good comparables should be the same property classification as your home, similar in size, construction type, and quality, and close by.

Once you have your comparable properties selected, you'll want to generate a PDF explaining why they are similar to your home, and how they show that your home is overassessed.

Step 4: Submit your appeal

You can file your property tax appeal through the Cook County Assessor's online filing tool.
The first step is to either create an account or log in if you already have one. After that, the filing tool will ask you to enter the PIN of the property that you are appealing. Then, it will ask you a series of questions about your home (that you shouldn't have any problems answering!). Finally, you'll have a chance to upload any documents that you think support your appeal case; this is where you'll upload a PDF of evidence that argues your

Step 5: Wait for results

The County Assessor's releases the results of all appeals for a Township at the same time. Once they release their results, they'll send you a notice in the mail letting you know whether they reduced your assessment or not. You can also check the status of your appeal on their website, by searching your property here.

Want to improve your chances of a successful appeal?

TaxProper will file an appeal on your behalf. We'll find the best evidence for your appeal, making sure that you don't overpay on your property tax bill.