Cook County, Illinois · checked 25 October 2026
Cook County property tax refunds: check if the Treasurer owes you money
The Cook County Treasurer holds refunds for people who paid too much: paying the same bill twice, an appeal or exemption that lowered the bill after it was paid, or a mortgage company and owner both paying. You can check on cookcountytreasurer.com in a couple of minutes.
Want the answer for your own case? Use the tool, then read on for the details.
Check if my home is over-assessedHow to check
- Go to cookcountytreasurer.com.
- Use Your Property Tax Overview, or the Overpayment Refund Search under Refunds, and enter your address or 14-digit Property Index Number (PIN). The PIN is on your tax bill.
- If a refund shows, follow the Treasurer's How to Apply for a Property Tax Refund instructions. There's also an Uncashed Check Search for refund checks that were sent but never cashed.
Common reasons you're owed money
- Paid twice: you and your mortgage servicer, or a buyer and seller around a sale, both paid the same installment.
- An appeal won after you paid: a lower value from the Board of Review or the state appeal board can mean a refund for that year.
- An exemption added late: a homestead, senior or other exemption granted later, often through a certificate of error.
- Exemptions bigger than the bill: the Treasurer sends some of these refunds automatically, by direct deposit or check, with no application.
How long you have
Illinois law gives most counties 5 years to claim a refund. Cook County has a much longer window, so older overpayments can still be worth checking. Search anyway even if the payment was years ago.
Paid on time, but the bill itself is too high?
That's not a refund, it's an appeal. Check whether your home is over-assessed and which deadline applies to your township.
Check if my home is over-assessed
Related: Cook County appeal deadlines · exemptions you may be missing · paid late? · state appeal board.
Sources: Cook County Treasurer, due dates and refunds pages (Tax Year 2025 second installment due 1 October 2026; Overpayment Refund Search, Refund Status Search, Uncashed Check Search); 35 ILCS 200/20-175 (5-year refund claim limit, longer for Cook County); Treasurer's automatic refund programme as reported July 2024. Read 25 October 2026. Phone: (312) 443-5100. General guidance, not legal advice.