What Are Property Taxes in Illinois — and How Are They Calculated?
Posted by Jenny Maraccini on February 2, 2026
Property taxes are one of the most common questions we hear from homeowners and buyers in Chicago and the surrounding suburbs. While they may not be the most exciting part of owning real estate, property taxes play an important role in supporting the communities we live in.
Here’s a clear, straightforward breakdown of what property taxes are, how they’re calculated in Illinois, and what homeowners should understand — whether you own a condo, single-family home, or multi-unit property.
What Are Property Taxes?
Property taxes are annual taxes paid to local governments. These funds help support essential public services, including:
- Public schools
- Police and fire departments
- Parks and libraries
- Street maintenance and neighborhood services
In Illinois, property taxes are primarily administered at the county level, which means tax rates and amounts can vary significantly depending on where your property is located.
How Are Property Taxes Calculated in Illinois?
In Illinois, property taxes are not based solely on square footage. Instead, they are calculated using a combination of:
- Assessed Value of the Property
Your county assessor determines an assessed value based on factors such as:
- Location and neighborhood
- Property type (condo, single-family, multi-unit)
- Size, condition, and recent sales of similar properties
- Equalization Factor (State Multiplier)
This is applied by the state to ensure assessments are consistent across counties.
- Local Tax Rates
Your final tax bill depends heavily on the tax rates set by local taxing bodies such as school districts, municipalities, and special service areas.
Because of this structure, two homes with similar sizes can have very different tax bills depending on location.
How Property Taxes Work for Condos
For condominium owners, property taxes are based on the assessed value of your individual unit, not the entire building.
Factors that influence condo property taxes include:
- The size of your unit
- Your unit’s location within the building
- The neighborhood and municipality
- Recent sales of comparable condos
Your association fees and property taxes are separate — HOA dues do not replace or reduce property taxes.
Why Property Taxes Vary So Much Across Chicagoland
Property taxes can vary widely between city neighborhoods and suburban communities. This is often due to:
- Differences in school funding structures
- Local municipal budgets
- Varying tax rates across townships and counties
This is why understanding property taxes is especially important when comparing homes in different neighborhoods or deciding whether to stay in the city or move to the suburbs.
Why Property Taxes Matter When Buying or Selling
Property taxes affect:
- Monthly housing costs
- Buyer affordability
- Long-term ownership expenses
For sellers, higher or lower property taxes can influence buyer interest. For buyers, knowing what to expect helps avoid surprises after closing.
Understanding taxes upfront allows for better planning — and better decisions.
We’re Here to Help You Navigate the Details
Property taxes can feel confusing, but you don’t have to figure them out alone. Whether you’re buying, selling, or simply curious about your current tax bill, having local insight matters.
We help our clients:
- Understand how property taxes factor into affordability
- Compare neighborhoods and property types
- Plan confidently for long-term ownership
If you have questions about property taxes — or how they affect your real estate goals — we’re always happy to talk.
👉 Contact us to set up a consultation or send us a message anytime.
