Duplicate and Overpayment Refund Search
Taxpayers are able to search Cook County's records online to view their current
tax records by simply entering their 14-digit Property Index Number (PIN). This
information reflects multiple payments or overpayments for which a refund may be
For additional information, please visit the Duplicate and
Overpayment FAQ section.
Instructions to follow when applying for a Duplicate or Overpayment Refund
If you believe you may have a claim on any funds, you must do the following:
- Obtain a copy of the Duplicate and Overpayment Application from the Cook County Treasurer's Office or download the form from this website.
- Complete the Duplicate and Overpayment Application by filling in Property Index Number (PIN), tax year, installment, name, address, city, state, zip code, email, signature and date.
Important Note: All above-mentioned fields must be completed in order for the Cook County Treasurer's Office to process your request.
- Locate proof of payment that shows you are entitled to receive a portion or the entire refund amount.
Proper Proof of Payment Section
- After you have completed the Duplicate and Overpayment Application, attach all proper proof of payment(s) and mail the paperwork to:
Cook County Treasurer
ATTN: Refund Department
118 North Clark Street, Room 112
Chicago, IL 60602
You may only be entitled to a partial refund for a duplicate or overpayment.
The amount posted on a PIN as a duplicate or overpayment is a lump sum amount. It might be several duplicate or overpayments (such as you paid and your mortgage company
paid), or even an amount posted to the PIN in error. You would be entitled to a refund of only those amounts overpaid which you can show, by proof of payment, that you made in excess of the amount due.