Cook County Property Tax Bills Are Out: What Chicago Homeowners Should Check Before October 1
Cook County property tax bills for 2026 are now available online, and homeowners may want to do more than simply look at the amount due.
The bills are officially the Tax Year 2025 Second Installment, even though they are being paid in 2026. Cook County Treasurer Maria Pappas made the bills available online on August 18, with roughly 1.8 million bills scheduled to be mailed by September 1. The payment deadline is Thursday, October 1, 2026.
This year's bills deserve a particularly close look. Property owners countywide are being asked to pay $743.8 million more than last year, bringing the total property-tax burden above $19.9 billion. Homeowners are absorbing most of that increase.
Before paying, here are the things Chicago homeowners should actually check.
1. Compare Your 2026 Bill With Last Year's Total
Start with the simplest question:
How much did your total property tax bill change?
Across Cook County, total taxes rose approximately 3.9%, while homeowners collectively are paying 5.3% more, an additional $593.4 million compared with the previous tax year.
Chicago's numbers are somewhat lower than the countywide increase.
For properties within the City of Chicago:
Overall property taxes increased about 2.2%
Homeowner taxes increased 2.7%
The median Chicago homeowner bill increased 3.2%
The median homeowner bill reached approximately $4,597
Nearly 660,000 residential properties received higher bills, while fewer than 66,000 saw decreases
That does not mean every Chicago homeowner's bill should have risen 3.2%. Some properties will see considerably larger changes, while others may see little movement or even a reduction.
If your increase is much larger than expected, keep reading before assuming it is simply a countywide tax hike.
2. Make Sure You're Comparing the Right Numbers
Cook County's billing system can be confusing because taxes are paid one year after the tax year they represent.
The bill due October 1, 2026 is:
Tax Year 2025, Second Installment
The first installment, which was due April 1, 2026, was calculated as 55% of the previous year's total property-tax bill. The second installment is where the actual tax calculation catches up with changes in:
Your property's assessment
The state equalization factor
Local tax rates and levies
Applicable property-tax exemptions
That is one reason the second installment can look dramatically different from the first.
For homeowners reviewing how much their taxes increased, it is more useful to compare the full 2025 tax-year total with the previous year's total, rather than simply comparing the first and second installment amounts.
3. Confirm Your Homeowner Exemption Is Actually on the Bill
This may be the most important thing to check before paying.
Most owner-occupants qualify for the Cook County Homeowner Exemption, which lowers the Equalized Assessed Value used to calculate the tax bill. Once established, the Homeowner Exemption normally renews automatically.
But homeowners should still verify it.
The Assessor's Office notes that exemptions appear on the second installment bill, making this the time of year when a missing exemption becomes visible.
Homeowners can also check their property's Exemption History and Status through the Cook County Assessor.
Depending on eligibility, other exemptions may apply as well, including the Senior Exemption, Persons with Disabilities Exemption, Veterans with Disabilities Exemption and other programs.
If an exemption that should be there is missing, do not simply assume the opportunity has passed.
Applications submitted after May 15, 2026 are being handled through the Certificate of Error process. If approved, the savings can appear on the second installment bill or on an adjusted bill issued afterward.
4. Check the Property Address and PIN
Before submitting a payment, make sure the bill is actually tied to the correct property.
Every Cook County property has a 14-digit Property Index Number, or PIN.
The Treasurer's online Property Tax Overview allows owners to search using either a property address or PIN, download the bill and review information associated with the property.
This sounds basic, but it matters especially if you:
Recently purchased the property
Own multiple properties
Have multiple PINs associated with one property
Recently completed a parcel division or consolidation
Have an escrow company handling the payment
Confirming the PIN before money changes hands is far easier than fixing a payment applied to the wrong parcel later.
5. If Your Mortgage Company Pays the Taxes, Verify That It Actually Does
Homeowners with an escrow account may not need to personally submit the October payment.
Their mortgage servicer may already be collecting a portion of the annual property taxes every month and holding the money in escrow.
But that does not mean homeowners should ignore the bill.
The Cook County Treasurer specifically warned homeowners in August to verify escrow payments because mortgage companies sometimes pay late, pay the wrong PIN or fail to make the payment altogether. The Treasurer continues sending bills directly to property owners even when a lender is expected to pay.
And if a servicer makes a mistake, the property owner can ultimately be responsible for the resulting late charges.
A good approach is:
Do not automatically pay the bill yourself if you have escrow. Instead, confirm with the servicer that the payment is scheduled, then verify the payment status with Cook County.
That avoids both a missed payment and an unnecessary duplicate payment.
6. Look at Where the Increase Came From
If your Chicago property tax bill jumped, an assessment increase is only one possible explanation.
Cook County property taxes are affected by several moving pieces.
The Assessor determines property values, while taxing bodies such as school districts, municipalities, park districts and other local governments determine how much revenue they need to collect. Those levies, along with assessments, exemptions and tax rates, ultimately determine what individual owners pay.
For the 2025 tax year, Chicago homeowners collectively are paying $120.9 million more in property taxes, while the median homeowner bill increased 3.2%.
So if your bill increased substantially more than that, check for:
A change in assessed value
A missing exemption
A change in ownership or occupancy
Changes in local tax rates
Differences in the taxing districts associated with the property
One common misconception is that a higher assessment automatically produces an identical percentage increase in property taxes. It does not. Assessments are only one piece of the calculation.
7. Check the “Where Your Money Goes” Section
Do not stop at the amount due.
Cook County tax bills identify the taxing districts receiving your property-tax dollars and allow owners to see how their tax obligations have changed.
The Treasurer's online Property Tax Overview also provides access to tax history, taxing-district debt information, potential refunds and exemption information.
For homeowners trying to understand a larger bill, this section can provide more useful context than simply seeing one higher number at the top of the page.
8. Know How to Pay Before October 1
The easiest option for many owners is to pay through the Cook County Treasurer's official website.
Property owners can search by address or PIN and make an electronic payment directly from a checking or savings account.
There is no fee for an ACH payment from a bank account.
Credit and debit card payments are also accepted, but a third-party processing fee applies.
Payments can also be made by mail, at the Treasurer's downtown office and through participating financial institutions.
The official deadline remains:
Thursday, October 1, 2026
What Happens If You Miss the October 1 Deadline?
Do not ignore a late bill.
Illinois law imposes late interest of 0.75% per month on unpaid Cook County property taxes.
Cook County also accepts partial payments, although interest continues to apply to unpaid balances after the deadline.
If paying the entire amount presents a problem, addressing it quickly is considerably better than allowing the bill to remain unattended.
Quick Checklist for Chicago Homeowners
Before October 1, make sure you have checked:
Bill: Is this the 2025 Second Installment payable in 2026?
Amount: How does your full annual tax bill compare with last year's?
Exemptions: Is your Homeowner Exemption showing? Are any other exemptions missing?
PIN: Does the bill match the correct property?
Escrow: If your mortgage servicer pays your taxes, has payment actually been scheduled or posted?
Assessment: Did your assessed value change?
Payment: If you pay directly, have you used the official Cook County payment system?
Deadline: Is the payment completed by October 1, 2026?
Homeownership Doesn't End at the Closing Table
Property taxes are one of the recurring costs that can materially change the true cost of owning a Chicago home, condo or investment property.
For current homeowners, reviewing the second-installment bill each year can help catch missing exemptions, escrow mistakes and unexpected tax changes before they become more expensive problems.
For buyers, property taxes also deserve careful attention before making an offer. The amount currently shown on a listing may reflect a previous owner's exemptions, assessment history or circumstances that will not necessarily carry over after closing.
If you're buying, selling or planning your next move in Chicago or Cook County, connect with The Cory Tanzer Group at Option Premier for guidance that looks beyond the purchase price and considers the costs that continue after you own the property.
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