AssessmentKit

Cook County, Illinois homeowners

Find out in 30 seconds if you're overpaying property tax.

We compare your home's assessment with similar homes in your neighborhood using the Assessor's own public data. The check is free. If you have a case, get a ready-to-upload evidence packet and file it yourself — free — with the county.

Or enter your 14-digit PIN from your tax bill.

How it works

  1. 01

    Free check

    Enter your address. We pull your assessment and up to 30 similar homes in your assessment neighborhood.

  2. 02

    Get your evidence packet

    If similar homes are assessed lower than yours, $49 gets you a comparables report, a suggested assessed value to request, and step-by-step filing instructions.

  3. 03

    File it yourself, free

    Upload the PDF on the Assessor's or Board of Review's website. Filing costs nothing and takes about 15 minutes.

One price. Refund if it doesn't work.

Appeal firms typically keep 25–50% of your first year's savings. You keep all of it.

$49 per property, one-timeComing soon

  • Free check — always
  • Comparables evidence report (PDF) ready to upload
  • Suggested assessed value to request
  • Step-by-step filing guide
  • Full refund if your assessment isn't reduced

Questions

›Is this legal advice or an appraisal?

No. We are a data and software company. We are not a law firm, a licensed appraiser, or a tax consultant, and we don't represent you. We organize the county's public data so you can file your own appeal.

›Why would my home be over-assessed?

Mass appraisal assigns values to hundreds of thousands of homes at once. Some homes end up assessed higher per square foot than nearly identical neighbors. That gap is a recognized basis for appeal ("lack of uniformity").

›Can my assessment go up if I appeal?

It is uncommon for a residential appeal to raise an assessment, but the reviewing office does have the authority to change values in either direction. Read the official rules before filing — your packet links to them.

›What if the appeal window for my township is closed?

The free check will tell you which office is next. Cook County has two appeal rounds a year (Assessor, then Board of Review), and you can appeal again next year.

›Do you support condos?

Not yet. We support single-family homes, townhomes and 2–6 unit buildings.