How to Read a Cook County Property Tax Bill

What is on a Cook County property tax bill, line by line

A Cook County property tax bill is put together by three separate offices, which is the single fact that makes it hard to read. The Assessor decides what the property is. The taxing bodies decide what they need. The Treasurer sends the bill and collects the money. When a line looks wrong, knowing which of those three set it is the difference between a five-minute call and a month of being transferred.

This article is part of our guide to what happens when you are behind on property taxes in Illinois. Here we are only reading the document. No amounts are quoted anywhere below, because rates and figures change and a stale number in an article is worse than none.

The two installments

Cook County bills in two installments. The first is an estimate based on the prior year, and it arrives early in the year. The second is the reconciled bill, and it arrives later, once the assessment and the rates for the year are settled.

The consequence catches people out. The second installment is where a change shows up. An assessment increase, a lost exemption, a new taxing body: none of it appears on the first installment, because the first installment was computed before any of it was known. An owner who budgeted from the first installment can be surprised by the second one.

The identifying block

At the top of the bill:

The PIN, the property index number. This is the property's identity in every county system, and it is the first thing any office will ask for. Our guide on how to check your Cook County property tax status covers finding it and what the lookup shows.
The property address and the mailing address. These are frequently different, and the mailing address is the one every notice goes to. If it is wrong, fix it; an owner who does not receive the bill still owes it.
The tax year. Illinois bills in arrears, so the year on the bill is not the year you are living in.
The township and the classification. Classification is the Assessor's description of what kind of property it is, and it affects the arithmetic.

The valuation block

This is the Assessor's work, not the Treasurer's.

Assessed value, derived from the Assessor's estimate of market value and the property's classification.
The equalization factor, applied at the state level so that counties are comparable.
Exemptions, listed as lines that reduce the taxable amount. Each one attaches to a person and their use of the property, and each has its own qualifying conditions. The Cook County Assessor's exemptions page sets out which ones exist and who is eligible.

If a valuation line looks wrong, the Assessor is the office, and the Assessor's site publishes the property characteristics it holds for the parcel. Checking those characteristics is worth doing even when the total looks fine: square footage, room counts and building class are all recorded, and a record that describes a building that is not there produces a bill for a building that is not there.

The taxing bodies block

A list of every body that levies against the parcel, each with its own line. Schools, the municipality or township, the county, the park district, the library, the water reclamation district, and often several more.

Two things to understand about it:

The Treasurer does not set any of these. The Treasurer collects. A line that looks high belongs to the body that levied it.
Two houses on the same block can have different lists. Taxing districts are drawn independently, and a boundary can run down a street.

The payment and arrears block

At the bottom, what is owed now and what was owed before.

The amount due and the due date for this installment.
Prior year amounts, if any are outstanding. This is the line that matters most, because it is where a bill stops being a bill and becomes a different problem. The Treasurer's page on prior year and delinquent taxes explains the distinction between taxes that are merely late, taxes that have been sold, and taxes that have been forfeited.
How to pay, and the fact that a payment posted to the wrong PIN is a real and recoverable problem, but only if somebody notices.

If the bill shows prior year amounts you did not know about, treat that as the urgent item on the page. Our guide on how the Cook County tax sale works explains what happens to unpaid amounts and who ends up holding them.

Owners outside the city limits deal with the same three county offices plus their own municipality, and our page on selling a house in Cook County covers where those local questions sit.

Frequently asked questions

Why is my second installment so much bigger than my first?

Because the first installment is an estimate computed from the prior year and the second one reconciles the whole year against the actual assessment, the actual rates and the exemptions actually applied. Any change to the property's assessed value or to its exemptions lands entirely on the second installment.

An exemption I used to have is missing. Who fixes that?

The Assessor's office, not the Treasurer. Exemptions attach to a person and their use of the property, and they can come off when circumstances change. The Assessor publishes what each exemption requires and how to ask about one that has dropped off.

The bill describes a building that is not on my property. What do I do?

Contact the Assessor and ask them to look at the property characteristics they hold for the PIN. Those records drive the valuation, and a record that no longer matches the building is a correctable error rather than something an owner has to live with.

If selling is one of the paths you are weighing

Selling a house as it stands to a private buyer is one option among several. Appealing an assessment, setting the arrears straight and holding the property, or listing with an agent are all still real, and which fits depends on numbers only you have.

Fair Value Investments is a private buyer. We buy houses in Cook County as-is, for our own account, and what is owed against a property is paid from the sale proceeds at closing by the title company. If you want to see what that looks like as a figure, our page on selling a house with taxes owed on it explains how we look at a property in this position. Take whatever number you get to an agent or an attorney and compare it.

Important notice: Fair Value Investments (a d/b/a of Probate Professionals of America, LLC) is not associated with the government, and our service is not approved by the government or your lender. You may stop doing business with us at any time and may reject any offer. If you stop paying your mortgage, you could lose your home and damage your credit rating. We do not provide foreclosure-rescue, loan-modification, or credit-repair services and cannot promise to save your home or stop a foreclosure. For free help, contact a HUD-approved housing counselor at 1-800-569-4287 or consumerfinance.gov/find-a-housing-counselor.

About this article: it is general information written by a home buyer, not by a lawyer or a housing counselor. Fair Value Investments (a d/b/a of Probate Professionals of America, LLC) is a private real-estate investor and home buyer purchasing property for our own account. We are not a licensed real estate broker, not a law firm, not a lender, and not a government agency, and nothing here is legal, tax, or financial advice. Any offer is made at our discretion after we evaluate the property; a cash offer, if made, may be below market value. You are free to consult your own attorney, tax advisor, or a licensed real-estate professional before deciding. There is no fee to receive an offer and no obligation to accept.