Cook County Property Tax Payment: Pay Online, Fees & Deadlines
Cook County property taxes are collected by the Cook County Treasurer. Before you pay, search the property by its 14-digit Property Index Number (PIN) or address, confirm the tax year and installment, check for an escrow payment, and review the live amount due.
Current 2026 status: Tax Year 2025 Second Installment bills are now available online and are due Thursday, October 1, 2026. The Treasurer says those bills are being mailed on or before September 1.
Quick Answer: How to Pay Cook County Property Tax
Open the Cook County Treasurer’s Your Property Tax Overview or the Cook County Property Tax Portal, search by 14-digit PIN or property address, verify the current bill and payment status, then choose an official payment method.
For many individual taxpayers, the lowest-cost online option is the Treasurer’s bank-account route because ACH payment from a checking or savings account currently has no fee. Card payment is available, but the current processor fee is 2.08%.
Do not begin by entering bank or card information. Search the live tax record first so you do not pay the wrong PIN, wrong installment or a bill already paid through escrow.
Cook County 2025 Second Installment: What Changed
The earlier uncertainty around the 2025 Second Installment has ended. On August 18, 2026, the Treasurer announced that Second Installment bills were available online before the paper mailing.
Property owners can view, download and pay the Tax Year 2025 Second Installment bill online now.
The Treasurer announced that roughly 1.8 million bills would be mailed on or before September 1, 2026.
The official Treasurer due-date page lists Thursday, October 1, 2026.
- Open Your Property Tax Overview.
- Enter the 14-digit PIN or search by property address.
- Open the Tax Year 2025 Second Installment.
- Review the total due and any exemptions shown.
- Check whether a payment has already posted.
- Pay only after the live record matches your property.
Before You Pay: 8 Checks That Prevent Most Mistakes
Match every segment of the Property Index Number.
Confirm the house number, street, unit and municipality.
Tax Year 2025 property taxes are payable in 2026.
Make sure you are paying First or Second Installment intentionally.
Use the live account instead of an old PDF or screenshot.
Check whether a lender or mortgage servicer already paid.
Second Installment bills are where current exemptions affect the calculation.
Know what receipt, confirmation or canceled check you will keep.
Do not pay from an old saved bill without checking the live record. A mortgage company may have paid after the PDF was downloaded, an exemption may have changed, or statutory interest may have changed a delinquent balance.
Cook County Property Tax Payment Portal: Search Before Paying
The Cook County Property Tax Portal is maintained by the Treasurer’s Office and combines information from several offices involved in the county property-tax system.
You can search using the 14-digit PIN or property address. The portal can show billed amounts, tax history, property information, exemptions, refund information, appeals information and tax-rate data.
- Open the Cook County Property Tax Portal.
- Use the 14-digit PIN when you have it.
- If you do not know the PIN, choose property-address search.
- Confirm property location, township, tax code and mailing information.
- Review billed amounts and payment status.
- Continue to payment only after the parcel is confirmed.
Address-search tip: The official portal advises users not to include street directions such as N or S and not to use abbreviations such as St. or Ave. when completing its property-address search.
How to Pay Cook County Property Tax Online
Use a checking or savings account through the Treasurer’s ACH payment route. The Treasurer currently states that there is no fee for this method.
Pay Online with Bank AccountCard payment is available through the Treasurer’s authorized system. Review the processor fee before final submission.
Pay Online with CardIf you can pay directly from a checking or savings account, compare the no-fee ACH route before choosing a card transaction with a percentage-based processor fee.
Cook County Property Tax Payment Fees
The Treasurer currently states there is no fee to pay from a checking or savings account using ACH debit.
The current card-payment terms list a 2.08% convenience fee. It is imposed and retained by the third-party processor and is nonrefundable.
A check returned by the taxpayer’s bank for any reason is subject to a $25 Treasurer processing fee plus any statutory interest that has accrued.
Online payers tendering payments on 10 or more PINs may be subject to an enhanced $2 processing fee per PIN and installment under the county ordinance.
Card fee update: the older screenshot retained below shows a 2.10% card fee. The Treasurer’s current Ways to Pay and card terms now list 2.08%. Always rely on the fee shown on the live payment screen before submitting.
Cook County Property Tax Payment Deadlines
Due: Wednesday, April 1, 2026.
This deadline has passed. Check payment status before making any late or duplicate payment.
Due: Thursday, October 1, 2026.
The bill is online now and paper bills are being mailed before the deadline.
Was due: Monday, December 15, 2025.
Use prior-year or delinquent-tax tools if an unpaid balance remains.
- Open the Treasurer’s Important Dates page.
- Find the exact tax year.
- Confirm First or Second Installment.
- Compare the official date with your tax bill.
- If the date has passed, search the current balance before paying.
First Installment vs Second Installment
Cook County’s two installments are not calculated the same way. This matters when a Second Installment looks much higher or lower than the first.
The Treasurer explains that the First Installment is an estimated bill equal to 55% of the previous year’s total property tax.
That is why it does not represent the final tax calculation for the current tax year.
The later bill reflects the current year’s final tax calculation after the First Installment and can reflect current exemptions, tax rates, assessments and other adjustments.
Current exemptions are applied to the Second Installment calculation.
Check exemption history and assessment information before assuming the payment portal made an error. Value and exemption issues generally belong with the Cook County Assessor, not the Treasurer’s payment processor.
How to Mail a Cook County Property Tax Payment
Cook County has unusually specific mailing rules. If you rely on a mailed payment near the deadline, the type of postmark and the contents of the envelope matter.
USPS vs private carrier: Illinois law allows qualifying USPS-postmarked mail to be recorded based on the mailing date. Payments sent by private carriers such as FedEx or UPS are recorded based on when the Treasurer receives the payment, not when you shipped it.
Before mailing, recheck the live bill amount because a delinquent payment must match the amount associated with the applicable postmark date.
Read Official Mail InstructionsPay at Chase Bank, a Community Bank or the Treasurer’s Office
Current Cook County property tax payments can be made at Chase locations in Illinois, including locations outside Cook County.
- Bring the tax bill payment coupon.
- Partial payments are accepted.
- Keep the dated receipt.
- Check branch hours before visiting.
You must have an account at the participating community bank. Bring the entire original tax bill and pay by direct debit from checking or savings.
The bank provides a receipt.
Find Participating Banks118 North Clark Street
Room 112
Chicago, IL 60602
Phone: 312-443-5100
Regular office hours are Monday-Friday, 9:00 a.m.-5:00 p.m., excluding designated holidays.
Check Office HoursBring the current bill or required coupon, PIN, payment method and any documents connected with the problem you are trying to solve.
Mortgage Escrow: Check Before You Pay Yourself
The Cook County Treasurer warns homeowners not to assume mortgage companies always pay correctly. A lender may pay late, use the wrong PIN or fail to make the payment.
At the same time, paying personally without checking can create a duplicate payment.
The property owner remains responsible for timely payment. Keep the tax bill even when a mortgage company is expected to pay from escrow.
If Your Second Installment Looks Too High, Check Exemptions
Payment is handled by the Treasurer, but property-tax exemptions are administered by the Cook County Assessor. This office-role distinction matters when the bill amount looks wrong.
Use the Assessor’s Property Details and review the Exemption History and Status section to see what was applied.
The Assessor states that applications received after May 15, 2026 are processed through the Certificate of Error process. If approved, savings may appear on the Second Installment or on an adjusted bill.
- Search the Assessor property record.
- Review Exemption History and Status.
- Confirm the benefit and tax year.
- Check eligibility for the missing exemption.
- Use the current application or Certificate of Error route.
- Keep the filing confirmation.
Late or Delinquent Cook County Property Tax
Illinois law currently imposes late-payment interest of 0.75% per month, equivalent to 9% per year, on unpaid Cook County property tax after the applicable due date.
The Treasurer allows partial payments, including through its online services and Chase Bank.
Partial payment does not erase interest on the remaining unpaid balance.
The Treasurer advises taxpayers paying delinquent taxes online to make only one online payment per day so late fees can post correctly.
The Treasurer offers a free planning tool for taxpayers with a delinquent balance of $100 or more. It can build monthly or twice-monthly partial-payment schedules.
Important: using the calculator or making partial payments does not by itself exempt a property from the Annual Tax Sale.
Open Payment Plan Calculator InformationIf the official account says taxes were sold, are in forfeiture, require redemption or cannot be paid through the normal current-year portal, stop using general payment instructions and follow the Treasurer/Clerk instructions for that exact delinquency stage.
If You Paid Twice or Overpaid
Duplicate payments often happen when both a homeowner and mortgage company pay the same installment. Cook County provides an online refund search and application process.
If You Recently Bought a Cook County Property
Use the deed, closing statement or prior tax record.
Do not rely only on the tax proration shown at closing.
Check both tax year and installment.
Confirm whether your new mortgage servicer will pay the bill.
Seller exemptions do not automatically prove your own eligibility.
Make sure future bills reach the correct address.
Property taxes are paid one tax year later in Cook County. A Tax Year 2025 bill is being paid in 2026, which is why closing credits and current bills can be confusing for new owners.
Cook County Payment Troubleshooting
Likely cause: wrong PIN, address formatting or wrong jurisdiction.
Next: try address search and compare the returned parcel carefully.
Likely cause: servicer delay or wrong PIN.
Next: compare Treasurer payment status with the escrow statement.
Likely cause: processing time, wrong account or rejected payment.
Next: keep the confirmation and verify payment status before paying again.
Likely cause: NSF, stop payment or banking issue.
Next: review the Treasurer returned-check instructions and current balance.
Likely cause: assessment, tax rate or missing exemption.
Next: check Assessor records instead of contacting the card processor.
Likely cause: payment timing overlap.
Next: use the Treasurer overpayment/refund search and keep both payment records.
Cook County Payment Terms to Know
- Property Index Number (PIN)
- The 14-digit Cook County parcel identifier used throughout the property-tax system.
- First Installment
- The first annual installment, generally equal to 55% of the previous year’s total tax.
- Second Installment
- The later annual bill that completes the current tax-year calculation after the first installment.
- ACH Debit
- An electronic transfer from checking or savings used for the Treasurer’s no-fee online bank-account payment route.
- Statutory Interest
- Late interest required by Illinois law after a property-tax installment becomes delinquent.
- Escrow
- Funds collected by a mortgage servicer to pay costs such as property taxes and homeowners insurance.
Official Cook County Property Tax Payment Links
Cook County Property Tax Payment FAQs
What is the Cook County 2025 Second Installment property tax due date in 2026?
The Cook County Treasurer lists Thursday, October 1, 2026 as the due date for the Tax Year 2025 Second Installment. The bill is already available online.
Can I pay Cook County property taxes online without a fee?
Yes. The Treasurer currently states that online ACH payment from a checking or savings account has no fee. Search your property first and verify the current installment before entering bank information.
What is the Cook County property tax card fee?
The Treasurer currently lists a 2.08% third-party processing fee for online credit or debit card payment. The fee is retained by the processor, is nonrefundable and can change, so confirm the live amount before submitting.
How do I mail a Cook County property tax payment so the postmark counts?
Follow the Treasurer’s current mail instructions, use the correct payment coupon, submit one check and coupon per PIN per envelope, write the PIN on the envelope and use USPS if you are relying on the mailing-date postmark. Private-carrier payments are recorded based on the date received.
What should I do if my mortgage company is supposed to pay my Cook County property taxes?
Search the official Treasurer payment status before paying yourself. Compare the county record with the mortgage servicer’s escrow activity. If the deadline is approaching and no payment appears, contact the servicer promptly rather than assuming the payment will post automatically.
Bottom Line
For Cook County property tax payment, search by PIN or address first, verify Tax Year 2025 Second Installment, check escrow and payment status, compare the no-fee ACH route with the 2.08% card option, and complete payment by the October 1, 2026 deadline. Save proof and confirm the payment posted afterward.
Search Property Pay Online Compare Fees Check Deadline Mail Instructions Official LinksMaterially reviewed and updated: August 28, 2026.