How Chicago property taxes work

Chicago’s property tax system is complex and consists of several key elements: It is important to understand each one:

Key Elements

Assessment by Cook County Assessor

• Properties are reassessed every three years based on market value.

• The county uses a classification system, where different property types are assessed at different percentages of their market value.

Assessment Ratios

• Residential (1-6 units): Assessed at 10% of market value.

• Commercial & Multifamily (7+ units): Assessed at 25% of market value.

Equalization by Illinois Department of Revenue

• Since Cook County assessments are lower than full market value, the state applies an equalization factor (also called a "multiplier") to adjust values closer to full market value.

• The equalization factor varies yearly but is usually between 2.7 and 3.3.

Tax Rate Applied by Local Authorities

• Multiple taxing bodies (city, county, schools, parks, etc.) determine the total property tax rate.

• The combined tax rate in Chicago is typically 6-7% of equalized assessed value (EAV).

Example: Property Tax Calculation for a 10-Unit Apartment Building

Let’s assume:

• Market Value: $2,000,000

• Assessment Ratio for Multifamily (7+ units): 25%

• Equalization Factor: 3.0

• Tax Rate: 6.5%

Step 1: Assessed Value Calculation

Assessed Value=Market Value×Assessment Ratio\text{Assessed Value} = \text{Market Value} \times \text{Assessment Ratio}Assessed Value=Market Value×Assessment Ratio =2,000,000×25%=500,000= 2,000,000 \times 25\% = 500,000=2,000,000×25%=500,000

Step 2: Equalized Assessed Value (EAV)

EAV=Assessed Value×Equalization Factor\text{EAV} = \text{Assessed Value} \times \text{Equalization Factor}EAV=Assessed Value×Equalization Factor =500,000×3.0=1,500,000= 500,000 \times 3.0 = 1,500,000=500,000×3.0=1,500,000

Step 3: Property Tax Calculation

Property Tax=EAV×Tax Rate\text{Property Tax} = \text{EAV} \times \text{Tax Rate}Property Tax=EAV×Tax Rate =1,500,000×6.5%=97,500= 1,500,000 \times 6.5\% = 97,500=1,500,000×6.5%=97,500

Final Property Tax Bill: $97,500 per year

Key Takeaways for Investors

• Multifamily properties (7+ units) have a higher tax burden than smaller residential buildings due to the 25% assessment ratio.

• Appealing property assessments can reduce tax liability.

• Property taxes can significantly impact cash flow, so investors should account for potential reassessments when underwriting deals.

• New developments may qualify for tax incentives (e.g., Class 9, Affordable Housing exemptions).

Understanding how Chicago property taxes work is essential for protecting your investment and accurately forecasting long-term cash flow. From reassessments every three years to higher tax burdens on multifamily properties, taxes are one of the most overlooked costs in Chicago real estate. If you’re unsure whether your assessment is fair or how taxes are impacting your returns, working with an experienced local team can make a real difference. Learn more about how professional Chicago property management can help investors plan smarter, or explore our guide on how to appeal property taxes in Cook County to reduce unnecessary expenses and improve overall performance.