Calculate your property tax for IL. Enter your home value, apply exemptions, and see your estimated annual tax.
Illinois has some of the highest effective property tax rates in the nation, commonly 2.0% to 2.5% of market value, driven by heavy reliance on local property taxes to fund schools. The system is unusually layered: property is assessed at a fraction of market value, a state equalization factor (the "multiplier") is applied, exemptions are subtracted in Equalized Assessed Value (EAV) terms, and then the local tax rate is applied. Cook County follows its own assessment rules that differ from the other 101 counties. Understanding the General Homestead Exemption, the senior programs, and the appeal process is the key to managing an Illinois bill. This guide walks through all of it, and the calculator below estimates your taxes.
Outside Cook County, property is assessed at 33⅓% of market value. Cook County uses lower statutory levels, assessing residential property at 10% of market value. The county assessment is then multiplied by a state equalization factor to bring the county's overall level to the statutory target, producing the Equalized Assessed Value (EAV). Exemptions are subtracted from EAV, and the local tax rate (the sum of all overlapping districts) is applied to the remainder. Because the math runs through EAV rather than raw market value, the same exemption can translate into very different dollar savings depending on your county's assessment level and multiplier.
The General Homestead Exemption (GHE) reduces the EAV of an owner-occupied primary residence — by up to $10,000 in Cook County and $6,000 in other counties. The Senior Citizens Homestead Exemption adds a further reduction (up to $8,000 EAV in Cook, $5,000 elsewhere) for owners 65 and older. The most valuable senior benefit is the Low-Income Senior Citizens Assessment Freeze, which freezes the EAV of qualifying seniors (household income under roughly $65,000) so rising values do not increase their taxable base. Additional homestead programs cover home improvements (temporary exemption for added value), persons with disabilities ($2,000 EAV), and returning veterans.
Illinois provides a tiered Disabled Veterans' Standard Homestead Exemption based on service-connected disability rating: roughly $2,500 EAV at 30–49%, $5,000 EAV at 50–69%, and a full exemption (the residence is entirely exempt) at 70% or higher. Surviving spouses may continue to receive the benefit. Given Illinois's high rates, the full exemption for 70%+ disabled veterans is among the most significant in the country.
Effective rates below are drawn from our county datasets. Select any county for its dedicated calculator and local detail.
Estimates apply each county's effective rate to a $280,000 market value for comparison only; your actual bill depends on your own assessed value, exemptions, and local levies.
Illinois property taxes are paid one year in arrears, and Cook County bills in two installments: the first (due around March 1) is automatically set at 55% of the prior year's total, and the second (due later in the year) covers the balance once rates are finalized. Downstate counties set their own due dates, typically in two installments during summer and fall. Late payments accrue statutory interest (commonly 1.5% per month in Cook), and prolonged delinquency can lead to a tax sale of the delinquent taxes.
Assessment appeals begin at the county level. In Cook County you can appeal first to the Assessor's Office during your township's open period and then to the Board of Review; downstate you appeal to the county Board of Review. If unsatisfied, you can escalate to the state Property Tax Appeal Board (PTAB) or to circuit court. The strongest arguments are lack of uniformity (comparable homes assessed at lower EAV) and overvaluation (recent sales or an appraisal below your implied market value). Because Illinois assessments run through EAV, uniformity appeals comparing your assessment to similar neighboring properties are especially common and effective.
Consider a $280,000 home in Cook County. At the 10% residential level the assessed value is $28,000; after the state multiplier and the $10,000 General Homestead Exemption, the taxable EAV is reduced further, and the local rate is applied. A senior who also qualifies for the Senior Homestead Exemption and, especially, the Assessment Freeze can hold that taxable EAV steady for years. Because the effective rate is high, each $1,000 of EAV reduction is worth real money. Estimate your own figure with the calculator below.
Why are Illinois property taxes so high? Heavy reliance on local property taxes to fund schools, combined with many overlapping taxing districts, pushes effective rates commonly between 2.0% and 2.5%.
What is Equalized Assessed Value (EAV)? The county's assessed value multiplied by the state equalization factor. Exemptions are subtracted from EAV, and the local tax rate is applied to the result.
How much is the General Homestead Exemption? Up to $10,000 of EAV in Cook County and $6,000 in other counties, for an owner-occupied primary residence.
What is the Senior Assessment Freeze? A program that freezes the EAV of qualifying low-income seniors (income under roughly $65,000) so rising values do not increase their taxable base.
Do disabled veterans pay property tax in Illinois? Veterans rated 70% or higher receive a full homestead exemption; those rated 30–69% receive tiered EAV reductions.
Illinois adds a step most states do not: after local assessors set values (residential property in Cook County is assessed at 10% of market value, while most other counties assess at one-third), the state applies an equalization factor, or "multiplier," so that assessments across counties reach the legally required level. This is why your equalized assessed value (EAV) can differ from the raw assessed value on your notice. Many jurisdictions are also covered by the Property Tax Extension Limitation Law (PTELL), which caps the annual growth of a taxing district's overall levy to the lesser of 5% or the rate of inflation, unless voters approve more. PTELL limits the total levy, not your individual bill, so your taxes can still rise if your assessment climbs faster than your neighbors'.
Illinois homeowners should confirm they receive the General Homestead Exemption, which reduces EAV for an owner-occupied primary residence. Seniors can add the Senior Citizens Homestead Exemption and, if income qualifies, the Senior Citizens Assessment Freeze, which locks the EAV so future reassessments do not raise the taxable base. There are additional exemptions for disabled persons, disabled veterans, and returning veterans. Because Illinois carries one of the highest effective property-tax rates in the nation, missing an exemption is costly. Cook County reassesses on a rolling triennial schedule, so a reassessment year is the most important time to review your notice and, if warranted, file an appeal with the county Board of Review.
Two local mechanisms can quietly shape an Illinois tax bill. In a Tax Increment Financing (TIF) district, the property taxes generated above a frozen base value are diverted to fund redevelopment within that district for up to 23 years; this does not add a separate line to your bill, but it affects how much of your existing tax reaches your schools versus the TIF fund. A Special Service Area (SSA), by contrast, is an add-on levy on a defined neighborhood that pays for extra services or improvements and appears as an additional charge. When you review your bill, note every taxing district listed, because Illinois property owners are typically funding a dozen or more separate districts, from the county and township to the school, park, library, fire-protection, and community-college districts. Understanding which districts drive your bill tells you where a levy referendum, or an appeal, will have the most impact.
Enter your home value, select your state, and see your estimated annual property tax.