How to Lower Property Taxes in Illinois: Assessment Appeals and Exemptions
TL;DR
Illinois has some of the highest property taxes in the country, with an average effective rate around 2.07%. But homeowners can fight back with assessment appeals, the general homestead exemption ($10,000 reduction in Cook County, $6,000 elsewhere), senior exemptions, senior freeze, and other targeted programs. Between exemptions and a successful appeal, many Illinois homeowners can save $1,000-$3,000 per year.
Illinois property taxes are notoriously high. The state consistently ranks in the top five nationally, and Cook County (Chicago) has some of the highest rates in the entire country. School districts consume the biggest share, often 60-70% of the total bill.
The system is complicated: county assessors set values, township assessors may also be involved, equalization factors are applied, and multiple taxing districts layer their rates on top. But that complexity also creates opportunities. Here's how to lower your bill.
Method 1: File for the General Homestead Exemption
Every owner-occupied home in Illinois qualifies for the general homestead exemption. The reduction amount depends on where you live:
| Location | Exemption Amount (EAV Reduction) |
|---|---|
| Cook County | $10,000 |
| All other counties | $6,000 |
This reduces your Equalized Assessed Value (EAV), which directly lowers your tax bill. Apply through your county assessor's office. In Cook County, you can apply online. The exemption auto-renews in some counties; check with yours.
For a full list of Illinois exemptions, see our Illinois property tax exemptions guide.
Method 2: Claim Senior Exemptions
Illinois offers two powerful programs for seniors:
Senior Citizens Homestead Exemption
Available to homeowners age 65 or older. Provides an additional EAV reduction:
- Cook County: $8,000
- Other counties: $5,000
Senior Citizens Assessment Freeze (SCAF)
This program freezes the EAV of your home at the level it was when you first qualified. Your market value can keep climbing, but your taxable value stays the same. Requirements:
- Age 65 or older
- Total household income under $65,000 (2026)
- Must own and occupy as primary residence
- Must reapply annually by July 1
The freeze can save seniors thousands per year, especially in rapidly appreciating neighborhoods. Many qualifying seniors don't know about this program.
Method 3: Appeal Your Assessment
Illinois assessment appeals are handled differently depending on your county:
Cook County
Cook County has a unique two-step process. You can appeal first to the Cook County Assessor's Office, then to the Cook County Board of Review. The Assessor's Office opens appeals by township in a rolling schedule throughout the year. For a detailed guide, see our Cook County appeal guide.
All Other Counties
In the other 101 Illinois counties, appeals go to the county Board of Review. The deadline to file is typically 30 days after your assessment notice is published or mailed. Check with your county for the exact deadline.
Building Your Case
Illinois appeals are based on either market value or uniformity (unequal assessment). Gather:
- 3-5 comparable sales showing your market value is lower than the assessed value
- Evidence of property condition issues (photos, repair estimates)
- For uniformity appeals: assessments of comparable properties that are lower than yours
See our comparable sales guide for instructions on finding and presenting comps.
Method 4: Understand the Equalization Factor
Illinois applies an "equalization factor" (also called the multiplier) to assessed values to bring them to 33.33% of market value across the county. In Cook County, the equalization factor is set by the Illinois Department of Revenue and can be higher than 3.0, which dramatically increases taxable values.
You can't appeal the equalization factor itself, but understanding how it works helps you know whether your assessment is really too high. If the assessor's value times the equalization factor puts your EAV above 33.33% of your market value, you have grounds to appeal.
Method 5: Other Exemptions
| Exemption | EAV Reduction | Who Qualifies |
|---|---|---|
| Disabled Persons | $2,000 | Homeowners with disabilities |
| Disabled Veterans | $2,500 - $5,000 (standard); full exemption for 70%+ rating | Veterans with VA disability rating |
| Returning Veterans | $5,000 | Veterans returning from active duty (two years) |
| Home Improvement | Up to $75,000 for 4 years | Homeowners who make qualifying improvements |
| Natural Disaster | Varies | Properties damaged by natural disaster |
Method 6: Check for Errors
Assessment errors are common in Illinois. Review your property record for:
- Incorrect square footage or lot size
- Wrong number of rooms, bathrooms, or stories
- Features you don't have (garage, basement finish, fireplace)
- Wrong age or condition rating
- Incorrect property classification
In Cook County, you can view your property record on the Assessor's website. Errors in the physical description can add thousands to your assessment.
Effective Tax Rates by Illinois County
| County | Effective Tax Rate | Median Home Value |
|---|---|---|
| Cook (Chicago) | 1.95% | $275,000 |
| Lake | 2.65% | $310,000 |
| DuPage | 2.10% | $340,000 |
| Will | 2.50% | $270,000 |
| Kane | 2.55% | $265,000 |
| McHenry | 2.60% | $260,000 |
| Winnebago (Rockford) | 2.85% | $140,000 |
| St. Clair | 2.45% | $140,000 |
Method 7: Tax Payment Options
While not a reduction strategy, Illinois homeowners should know about these payment options:
- Senior Tax Deferral: Seniors 65+ with income under $55,000 can defer property taxes (the state places a lien on the property, with taxes paid when the home is sold)
- Payment plans: Many counties offer installment plans for past-due taxes
- Circuit Breaker: Illinois provides a property tax credit on the state income tax return for qualifying taxpayers
Frequently Asked Questions
Why are Illinois property taxes so high?
Illinois has nearly 7,000 local taxing districts, more than any other state. Each one levies its own property tax. School districts account for the largest share, but you also pay for parks, libraries, fire protection, mosquito abatement, and other special districts. The layering of these levies pushes total rates well above national averages.
Can I appeal the equalization factor?
Individual homeowners cannot appeal the equalization factor. It's set by the state. But you can appeal the assessor's underlying value, which the factor is applied to.
How much can I save by appealing?
Successful Illinois appeals typically reduce assessed value by 10-20%. On a home paying $8,000 per year in property taxes, that's $800-$1,600 in annual savings. Combined with exemptions, total savings can reach $2,000-$3,000 per year.
Is the senior freeze an actual tax freeze?
It's an assessment freeze, not a tax freeze. Your EAV stays the same, but if tax rates increase, your bill can still go up slightly. In practice, the freeze prevents the large increases that come from rising assessed values, which is the bigger factor in most years.
Lower Your Illinois Property Taxes
Our Evidence Packet gives you comparable sales, assessment analysis, and everything you need for your Board of Review appeal. Works for Cook County and all 101 other counties.
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