You can view your Cook County property tax bill online at the Cook County Treasurer's website using either your 14-digit Property Index Number (PIN) or your property address. Bills are posted online before they are mailed, so you can see what you owe — and confirm your exemptions — two weeks or more before the paper bill arrives. Viewing and downloading your bill is free.
Second Installment 2025 bills: where things stand right now
Current as of August 20, 2026.
- Posted online: August 18, 2026
- Mailed: on or before September 1, 2026
- Due: October 1, 2026
- Bills issued: approximately 1.8 million
You do not have to wait for the envelope. The bill is already viewable, and looking at it early gives you time to confirm your exemptions were applied and to plan the payment — or to decide whether the assessment behind it is worth challenging. See where your second-installment bill is if it has not appeared yet.
How to look up your bill by PIN
- Go to the Cook County Treasurer's website and choose the option to view or pay your bill.
- Enter your 14-digit Property Index Number.
- Select your parcel from the results.
- View the current amount due, both installments, and payment status. A PDF of the bill can be downloaded and printed.
Step-by-step screenshots are in our guide to downloading your Cook County tax bill.
How to look up your bill by address
If you do not know your PIN, you can search by property address instead. Enter the street number, street name, and city or ZIP. Address searches sometimes return several parcels — condominium buildings, properties with an attached garage parcel, and split lots are common cases — so confirm the unit number and the parcel description before assuming the first result is yours.
What a PIN is, and how to find yours
A Property Index Number is the county's unique 14-digit identifier for a parcel of land, usually written in the form xx-xx-xxx-xxx-xxxx. Every one of Cook County's parcels has one, and nearly every county record — assessment, bill, exemption, appeal — is filed against it rather than against your name or address.
Your PIN appears:
- At the top of your property tax bill
- On your assessment notice from the Assessor's Office
- On your deed and on your title insurance policy
- On the closing statement from when you bought the property
- Through an address search on any of the county's property lookup sites
If you own more than one parcel — a home and a separately assessed garage or parking space, for example — each has its own PIN and its own bill.
Which official county site does what
Cook County splits property tax information across several offices, which is the single most common source of confusion for homeowners:
- Cook County Treasurer — what you owe, both installments, payment status, payment history, refunds, and the downloadable PDF bill.
- Cook County Assessor — how your property is valued: assessed value, characteristics on file, exemptions, and assessment notices.
- Cook County Property Tax Portal — a combined view that pulls from the Treasurer, Assessor, Clerk, and Board of Review, including appeal history.
- Cook County Clerk — tax rates by tax code, and the equalization factor applied to assessed values.
If you want the amount due, start at the Treasurer. If you want to understand why the amount is what it is, start at the Assessor. Our guide to Cook County property tax records online covers what each office publishes.
Paying online: free by bank transfer, 2.08% by card
Payment directly from a checking or savings account on the Treasurer's site is free and available around the clock. Paying by credit card carries a convenience fee of 2.08% — on a $6,000 bill that is roughly $125 for the convenience.
Other options include approximately 400 Chase Bank locations in Illinois, more than 100 participating community banks (which generally require the physical bill), payment by mail, and in person at the Treasurer's Office at 118 N. Clark Street, Room 112, in Chicago.
Partial payments are accepted and reduce the interest that accrues on an overdue balance. More detail is in our breakdown of payment options and deadlines.
What to do if your bill is missing or will not come up
A bill that does not appear online usually has one of a handful of explanations:
- The installment has not been posted yet. Second-installment bills in particular are released on a schedule that moves from year to year.
- The PIN was mistyped. All 14 digits are required; a single transposed digit returns nothing or returns someone else's parcel.
- The property recently changed hands or was divided. New PINs take time to appear, and a divided parcel may be billed under numbers that did not exist last year.
- Your mortgage servicer receives the bill. If taxes are escrowed, the paper bill may go to the servicer while the online record stays fully visible to you.
Escrow is worth a specific warning: a servicer pays whatever the county bills, without reviewing whether the assessment behind it is correct. An over-assessment inside an escrow account is invisible until your monthly payment jumps. See what to do about a missing tax bill.
Do I need an account or a login?
No. Viewing, downloading, and paying your Cook County property tax bill does not require registering for an account — the PIN or the address is enough. You may optionally sign up for eBilling to receive future bills by email; our eBilling guide explains how and what it does not change. If a site is asking you to create an account or to pay a fee simply to view a bill, confirm you are on an official county domain.
Your bill went up. Now what?
Looking up the bill is the easy part. The harder question is whether the number is right.
Your bill is the product of three things: the assessed value the Assessor placed on your property, the state equalization factor, and the local tax rate set by the taxing bodies where you live. You cannot negotiate the rate, and the equalizer is set at the state level. The assessed value is the only one of the three you can challenge — and it is the one most likely to be wrong, because it is generated by a mass-appraisal model rather than by anyone visiting your property.
Common reasons an assessment is too high:
- Square footage, room count, or condition recorded incorrectly
- Your assessment out of line with comparable homes on your block — the uniformity argument the county's own process is built around
- A finished basement or an improvement carried on the record that no longer exists, or never did
- A reassessment year that moved your township's values as a group without regard to your particular property
- Exemptions you qualify for that were never applied
Appeals are filed township by township, and each township's window is open for a limited period each year at the Assessor and again at the Board of Review. Check your township's current appeal deadline — if your window is open, the filing itself takes far less time than most people expect, and the process runs largely on paper.
Two things worth knowing before you decide it is not worth the trouble: a successful appeal reduces the assessed value that drives every future bill, not just this one, and a reduction can produce a refund where taxes have already been paid. Our fees are contingency-only — nothing upfront.
To see what a reduction would be worth on your own parcel, run the numbers in our Cook County property tax calculator, or read why Cook County tax bills rise for the mechanics behind the increase.