DuPage County Property Tax Appeal — Illinois

Rob Hartley·Updated February 15, 2026

DuPage County, Illinois, with its county seat in Wheaton, is home to major population centers including Naperville, Aurora (partially), and Downers Grove. With a median home value of $409,100 and an effective tax rate of 1.91%, DuPage County's property taxes are significantly higher than the national median of $2,400 annually. The county's median annual tax bill of $7,812 reflects the high property values in this affluent Chicago suburb, making property tax appeals particularly important for homeowners seeking to reduce their tax burden.

Notable cities: Naperville, Aurora, Wheaton, Downers Grove, Elmhurst

Median Home

$409,100

Tax Rate

1.91%

Annual Tax

$7,812

Population

904,161

2026 Appeal Deadline: 30 days after publication of township assessment roll

Each township publishes assessments at different times throughout the year. The appeal deadline is 30 days from the publication date in local newspapers. York Township's 2026 deadline was November 17, 2026.

Property in DuPage County, Illinois — local tax assessment and appeal guide

How DuPage County Assesses Property

33.33%of market value

Assessed by: Township Assessors (9 townships) and DuPage County Supervisor of Assessments

Assessment cycle: annual

Notices typically mailed: Spring (typically by mid-April)

In DuPage County, properties are assessed at 33.33% of their market value, as required by Illinois law. For example, if your home's market value is $409,100, at Illinois's 33.33% assessment ratio your assessed value would be $136,355, resulting in approximately $7,812 in annual taxes at the county's effective rate of 1.91%.

The Appeal Process

Appeals are heard by the Board of Review. You will present your case to a three-member panel at the Board of Review hearing. Written decisions are typically mailed the following March after all county hearings are complete.

Step 1: Contact your Township Assessor first for an informal review of your assessment

Step 2: Gather evidence including comparable sales, property record card errors, or recent appraisal

Step 3: File appeal with DuPage County Board of Review within 30 days of assessment publication

Step 4: Attend Board of Review hearing to present evidence to the three-member panel

Step 5: If unsuccessful, appeal to Illinois Property Tax Appeal Board (PTAB) within 30 days of Board of Review decision

Required form: Board of Review Assessment Appeal Forms (available at Township Assessor offices and online)

Filing Methods

mail:DuPage County Board of Review, 421 North County Farm Road, Wheaton, IL 60187

in-person:Jack T. Knuepfer Administration Building, 421 North County Farm Road, Wheaton, IL 60187

online:Forms available at https://www.dupagecounty.gov/soa

Evidence to Bring

Comparable sales from the last 3 yearsRecent appraisalPhotos showing property conditionEvidence of property record card errors

DuPage County Assessor Contact

DuPage County Supervisor of Assessments

Phone: (630) 407-5858

Address: 421 North County Farm Road, Wheaton, IL 60187

Website: https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/

Online Portal: https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/forms_and_documents.php

Hours: Monday to Friday, 8:00 AM - 4:30 PM

Tax Exemptions in DuPage County

General Homestead Exemption

$8,000 reduction in assessed value

Reduces assessed value for principal residences

Eligibility: Owner-occupied principal residenceDeadline: Typically automatic through Township Assessor

Senior Citizens Homestead Exemption

$8,000 reduction in assessed value

Additional reduction for homeowners 65 and older

Eligibility: Age 65+ during tax year, owner-occupiedDeadline: Apply with Supervisor of Assessments Office

Senior Assessment Freeze

Freezes assessment at base year level

Freezes assessed value for qualifying seniors

Eligibility: Age 65+, household income under $65,000Deadline: Annual renewal required

Homestead Improvement Exemption

Up to $25,000 in assessed value ($75,000 market value)

Exempts value added by home improvements for 4 years

Eligibility: Owner-occupied homes with improvementsDeadline: Automatically applied by Township Assessor

Disabled Veterans Exemption

Up to $100,000 for specially adapted housing

Exemption for veterans with service-connected disabilities

Eligibility: Veterans with service-connected disabilitiesDeadline: Contact Supervisor of Assessments Office

Official Resources

DuPage County Supervisor of Assessments →

Official county office for property assessments, exemptions, and appeal information

DuPage County Board of Review →

Information about the appeal process, hearing procedures, and Board of Review rules

Illinois Property Tax Appeal Board →

State-level appeal option if unsuccessful at the county Board of Review

DuPage County Property Lookup Portal →

Search for property information, tax bills, and assessment data

Check Your DuPage County Assessment

Enter your address to see if your DuPage County property is overassessed.

✓ All 50 states✓ Instant results✓ $49 flat fee

Frequently Asked Questions

What is the deadline to appeal my property taxes in DuPage County?

The deadline to appeal your property tax assessment in DuPage County is 30 days after your township publishes the assessment roll in local newspapers. Each of the nine townships publishes at different times throughout the year, typically between spring and November. For example, York Township's 2026 assessments were published on October 16, 2024, with appeals due by November 17, 2026. Contact your Township Assessor or check the DuPage County website for your specific township's publication date.

How do I file a property tax appeal in DuPage County online?

While DuPage County provides appeal forms online at https://www.dupagecounty.gov/soa, the actual filing must be done by mail or in-person at the Board of Review office at 421 North County Farm Road, Wheaton, IL 60187. You can download the Board of Review Assessment Appeal Forms from the website, complete them with your evidence of overassessment such as comparable sales or appraisal data, and mail them within 30 days of your township's assessment publication date. The forms cannot be submitted electronically.

What is the homestead exemption worth in DuPage County?

The general homestead exemption in DuPage County provides an $8,000 reduction in assessed value for owner-occupied principal residences. At the county's average tax rate of approximately 7.297%, this translates to about $584 in annual tax savings. The exemption is typically applied automatically by your Township Assessor, but you should verify with their office if you recently purchased your home. Senior citizens can receive an additional $8,000 exemption, potentially doubling their savings to about $1,168 annually.

What happens at a Board of Review hearing in DuPage County?

At a DuPage County Board of Review hearing, you'll present your case to a three-member panel in person at the Jack T. Knuepfer Administration Building in Wheaton. You should bring evidence supporting your claim that your property is overassessed, such as recent comparable sales from the past three years, a professional appraisal, photos showing property condition issues, or documentation of errors in your property record card. The Township Assessor will also present their position. The Board typically makes decisions after all hearings are complete, with written notices mailed the following March.

How much can I save by appealing my property taxes in DuPage County?

The amount you can save depends on how much your assessment can be reduced based on your evidence. For example, if you successfully prove your home is overassessed by $30,000 in market value, this would reduce your assessed value by $10,000 (at the 33.33% ratio), saving you approximately $730 annually at DuPage County's average effective tax rate of 7.297%. Many homeowners who discover errors in their property record cards or present strong comparable sales evidence achieve reductions ranging from a few hundred to several thousand dollars annually.

What evidence do I need for a DuPage County property tax appeal?

For a successful appeal in DuPage County, you'll need evidence showing your property is overassessed compared to its actual market value. The most effective evidence includes recent sales of comparable properties from the past three years (similar size, age, location, and condition), a current professional appraisal (not a realtor's market analysis), documentation of any errors in your property record card such as incorrect square footage or room count, and photos showing any structural issues, damage, or outdated features that reduce value. The Board of Review provides comparison grids on their forms to help organize your comparable sales data.

Can I appeal if I missed the DuPage County Board of Review deadline?

If you miss the 30-day Board of Review deadline after your township's assessment publication, you cannot appeal that year's assessment locally. However, you have several options: contact your Township Assessor to correct any factual errors on your property record card for future years, prepare evidence for next year's appeal cycle, or if you previously appealed to the Board of Review and received a decision, you may have 30 days from that decision date to appeal to the Illinois Property Tax Appeal Board. Some townships like Naperville publish assessments as early as September, so mark your calendar for next year.

What is the Senior Assessment Freeze and how do I qualify in DuPage County?

The Senior Assessment Freeze in DuPage County freezes your property's assessed value at the base year level, protecting you from increases due to rising property values. To qualify, you must be 65 or older, have a total household income under $65,000, own and occupy the property as your principal residence, and be liable for the property taxes. The freeze can save thousands of dollars over time as property values increase. Applications are processed by the DuPage County Supervisor of Assessments Office at(630) 407-5858, and you must renew annually with proof of continued eligibility.

For state-wide appeal information including Illinois's assessment ratio and deadlines, see our Illinois Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More Illinois Counties

Cook County (Chicago)Kane County (Aurora)Lake County (Waukegan)McHenry County (Woodstock)Will County (Joliet)

← All Illinois property tax appeal info

Sources: https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/ | https://smartasset.com/taxes/illinois-property-tax-calculator | https://www.ownwell.com/trends/illinois/dupage-county | https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/board_of_review/

Last verified: 2026-02-15