What Is Cook County Property Tax and Who Pays It?

Cook County property tax is a tax on real estate (land and buildings) located in Cook County, Illinois. It is paid by property owners, including homeowners, landlords, and businesses that own property. This tax isn’t charged by the federal or state government – it’s collected locally to fund public schools, police and fire departments, parks, libraries, roads, and other services in your community. Every property owner contributes, and how much you pay depends on the value of your property.

Call (708) 888-8880 or visit Cook County Tax Appeals to get started.

How Property Tax Is Calculated in Cook County

The amount of property tax you owe is determined by a formula:

Assessed Value × State Equalization Factor × Local Tax Rate = Property Tax (before exemptions)

Exemptions then reduce the taxable value, lowering the final tax. Here’s a breakdown:

• Assessed Value: The value of your property for tax purposes. In Cook County, residential homes are usually assessed at 10% of their market value. For example, if your house could sell for $300,000, the assessed value is about $30,000. Properties are reassessed every three years.

• Equalization Factor (State Multiplier): A number applied to ensure assessments are uniform across Illinois. For example, if the factor is about 3, your $30,000 assessed value becomes $90,000 equalized assessed value (EAV).

• Local Tax Rate: Each town, school district, and local government sets budgets. The rate (often 6–10%) is applied to the EAV.

• Exemptions: Discounts for qualifying owners. The most common are:

• Homeowner Exemption: Reduces the EAV by $10,000.

• Senior Exemption: Reduces the EAV by $8,000.

• Senior Freeze, Disability, and Veterans Exemptions: Provide additional relief depending on eligibility.

Example: Calculating a Property Tax Bill

Suppose you own a home worth $300,000:

1. Market value: $300,000

2. Assessed value (10%): $30,000

3. Equalized assessed value (factor ≈ 3): $90,000

4. Subtract homeowner exemption: $90,000 – $10,000 = $80,000

5. Apply local tax rate (say 7%): $80,000 × 0.07 = $5,600 annual property tax

Without exemptions, the bill would have been about $6,300, so exemptions can save hundreds of dollars.

Cook County Tax Appeals

Paying Your Property Tax

Property taxes in Cook County are paid in two installments:

• First Installment (March 1): Always 55% of last year’s total bill.

• Second Installment (summer/fall): The balance due after the current year’s assessments, exemptions, and rates are finalized.

If you have a mortgage, your lender often pays the taxes from an escrow account. If not, you pay directly to the Cook County Treasurer.

Common Exemptions

• Homeowner Exemption: $10,000 off EAV for your primary residence.

• Senior Exemption: $8,000 off EAV for those 65+.

• Senior Freeze: Freezes EAV for seniors with limited income.

• Others: For people with disabilities, disabled veterans, long-time homeowners, or those making certain improvements.

Appeals and Reassessment

Cook County reassesses properties every three years. If you believe your home is assessed too high compared to similar properties, you can file an appeal. Successful appeals lower your assessed value and reduce your tax. Appeals can be filed with the Cook County Assessor or the Board of Review during open filing periods.

Check your township deadlines

Key Takeaways

• Property tax funds, schools, safety, and local services.

• It’s based on assessed value (10% of market value for homes), adjusted by the state multiplier and local tax rates.

• Exemptions can save you hundreds of dollars.

• Paid in two installments: 55% in March, the rest in summer/fall.

• You can appeal your assessment if it seems too high.

Hani Khatib: Attorney at Law, CPA, and LL.M. in Taxation