DuPage County Property Tax Appeal, Illinois

Travis Bunn·Updated July 24, 2026

DuPage County, Illinois, with its county seat in Wheaton, is home to approximately 930,000 residents and is the second-most populous county in Illinois. Major population centers include Naperville (the largest city), Aurora, Downers Grove, Elmhurst, and Wheaton. Property tax appeals are particularly important here because DuPage County has one of the highest property tax burdens in the country, with an effective tax rate significantly above both state and national averages. The median annual tax bill of $7,833 is more than three times the national median of $2,400, making even small assessment reductions financially meaningful for homeowners.

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

Median Home

$374,100

Tax Rate

2.09%

Annual Tax

$7,833

Population

930,000

On the typical DuPage County home, valued near $374,100 at the county’s effective tax rate of 2.09%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

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

Each of DuPage County's 9 townships publishes assessment rolls at different times throughout the year, typically between spring and November. The appeal deadline is strictly 30 days from the publication date in local newspapers. You must check the DuPage County Supervisor of Assessments website for your specific township's publication date and corresponding Board of Review deadline, as missing the deadline by even one day means losing your appeal rights.

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Aerial view of an Illinois residential neighborhood. DuPage County appeal guide.

How DuPage County Assesses Property

33.33%of market value

Assessed by: DuPage County Supervisor of Assessments and Township Assessors

Assessment cycle: annual

Notices typically mailed: Spring (typically mid-May)

In DuPage County, properties are assessed at 33.33% of their fair market value, as required by Illinois law. This assessed value is then used to calculate your property taxes. For example, if your home's market value is $374,100, at Illinois's 33.33% assessment ratio your assessed value would be $124,700, resulting in approximately $7,833 in annual taxes at the county's effective rate of 2.09%. The Illinois Department of Revenue may also apply an equalization factor to ensure consistency across all counties.

The Appeal Process

Appeals are heard by the Board of Review. You will present your case to a three-member panel at an informal hearing. The Board members have real estate experience and are trained in property valuation. Come prepared with organized evidence and be ready to explain why your property's assessed value should be reduced based on market data or assessment uniformity.

Review your assessment notice and contact your Township Assessor to discuss your concerns informally. Many issues can be resolved at this stage without formal appeal.

Gather supporting evidence including 3-5 comparable sales from the prior 3 years (properties similar to yours that sold for less), recent professional appraisal, photographs showing property condition, or documentation of property defects or damage.

Download and complete the Board of Review Assessment Complaint Form from www.dupagecounty.gov/soa. Include your property index number (PIN), requested assessed value, and detailed explanation of why you believe your assessment is too high.

File your completed appeal form with supporting evidence by mail or in-person at the DuPage County Board of Review office at 421 North County Farm Road, Wheaton, IL 60187, within 30 days of your township's assessment roll publication date.

Attend your Board of Review hearing when scheduled. Present your evidence to the three-member panel, explaining why your assessment should be reduced. The Board will review comparable sales and property characteristics.

Receive the Board's written decision, which is typically mailed the following March after all county hearings are completed. The decision will show whether your assessed value was reduced, maintained, or changed.

If unsatisfied with the Board of Review decision, you may appeal to the Illinois Property Tax Appeal Board (PTAB) within 30 days of receiving the decision notice, or to the Circuit Court as a final option.

Required form: Board of Review Assessment Complaint Form (available at www.dupagecounty.gov/soa)

Filing Methods

mail:Mail to: DuPage County Board of Review, 421 North County Farm Road, Jack T. Knuepfer Admin. Bldg., Wheaton, IL 60187

in-person:Deliver to: DuPage County Board of Review, 421 North County Farm Road, Jack T. Knuepfer Admin. Bldg., Wheaton, IL 60187, during business hours (8:00 AM - 4:30 PM, Monday-Friday)

online:Forms can be downloaded from www.dupagecounty.gov/soa, but must be filed by mail or in-person (no electronic filing currently available)

Evidence to Bring

3-5 comparable sales from the prior 3 years showing similar properties sold for lessRecent professional appraisal reportPhotographs documenting property condition or defectsRepair estimates or documentation of structural issuesAssessment data for similar properties in your neighborhood showing lower valuesRecent sale of your property (if applicable)

DuPage County Assessor Contact

DuPage County Supervisor of Assessments

Phone: 630-407-5858

Address: 421 North County Farm Road, Jack T. Knuepfer Admin. Bldg., Wheaton, IL 60187

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

Online Portal: https://propertylookup.dupagecounty.gov/search/commonsearch.aspx?mode=parid

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

Tax Exemptions in DuPage County

General Homestead Exemption (Residential)

$8,000 reduction in assessed value

Reduces the equalized assessed value for owner-occupied principal residences. Automatically granted by Township Assessors in most cases.

Eligibility: Must occupy the property as principal residence and be responsible for paying property taxes. Property must be used exclusively for residential purposes.Deadline: Typically automatic; contact Township Assessor if not receiving

Senior Citizens' Homestead Exemption

$8,000 reduction in assessed value (typical savings about $584 annually)

Provides a reduction in equalized assessed value for homeowners aged 65 or older.

Eligibility: Must be 65 years of age or older during the tax year, own and occupy the property as principal residence. Once enrolled, automatically renewed each year.Deadline: Apply with DuPage County Supervisor of Assessments; no specific annual deadline once enrolled

Senior Citizens Assessment Freeze

Freezes assessed value (can save thousands over time as values increase)

Freezes the assessed value at the level when the senior turned 65, protecting against assessment increases as property values rise.

Eligibility: Age 65 or older, total household income of $65,000 or less, occupy property as principal residence and liable for taxes.Deadline: Must apply annually; applications typically mailed by DuPage County in June

Disabled Veterans' Standard Homestead Exemption

$2,500 for 30-49% disability; $5,000 for 50-69% disability; First $250,000 of EAV exempt for 70%+ disability (typical savings $180-$4,000+)

Provides annual exemption based on service-connected disability percentage certified by U.S. Department of Veterans Affairs.

Eligibility: Illinois resident, served in U.S. Armed Forces, at least 30% service-connected disability certified by VA, own and occupy as primary residence.Deadline: Must reapply annually with DuPage County Supervisor of Assessments

Returning Veterans' Homestead Exemption

$5,000 reduction in assessed value for the tax year of return (typical savings about $375)

One-time exemption for veterans returning from active duty in armed conflict.

Eligibility: Returned from active duty in armed conflict involving U.S. Armed Forces during the tax year, own or lease and occupy as primary residence.Deadline: File completed PTAX-341 form with documentation for the tax year of return

Homestead Exemption for Persons with Disabilities

$2,000 reduction in assessed value

Annual exemption for disabled persons occupying property as principal residence.

Eligibility: Must have Class 2 Illinois Disabled Person ID, or receive Social Security disability benefits, or VA disability benefits. Must own and occupy as principal residence.Deadline: File completed PTAX-343 form with proof of disability

Homestead Improvement Exemption

Up to $25,000 of assessment increase exempted (typical savings about $1,900)

Exempts assessment increases due to home improvements for four years.

Eligibility: Existing primary residence with assessment increase from physical change or improvement. Automatically initiated by Township Assessor.Deadline: Automatic when Township Assessor increases assessment due to improvements

Disabled Veterans' Specially Adapted Housing Exemption

Up to $100,000 reduction on assessed value (typical savings up to $4,000)

For specially adapted housing where federal funds were used for purchase or construction.

Eligibility: Property owned and used exclusively by veteran with disability, federal funds used for specially adapted housing. Automatically renewed by Illinois Department of Veterans Affairs.Deadline: Contact DuPage County Supervisor of Assessments at 630-407-5858

DuPage County Appeal Packet · $49

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Frequently Asked Questions

What is the deadline to appeal my property taxes in DuPage County for 2026?

The deadline to file a property tax appeal in DuPage County is 30 days after your township publishes the assessment roll in local newspapers. Because DuPage County has 9 townships that each publish at different times throughout the year (typically between spring and November), your specific deadline depends on which township your property is located in. For example, York Township's 2026 assessments had a deadline of November 17, 2026. You must check the DuPage County Supervisor of Assessments website or call 630-407-5858 to confirm your township's publication date and corresponding appeal deadline. Missing your deadline by even one day means you lose your appeal rights for that year.

How do I file a property tax appeal with the DuPage County Board of Review?

To file an appeal, first download the Board of Review Assessment Complaint Form from www.dupagecounty.gov/soa. Complete the form with your property index number (PIN), requested assessed value, and detailed explanation. Gather supporting evidence including 3-5 comparable sales from the prior 3 years, photos, or a recent appraisal. Before filing formally, it's recommended to contact your Township Assessor to discuss your concerns, as many issues can be resolved informally. Submit your completed form and evidence by mail or in-person to the DuPage County Board of Review, 421 North County Farm Road, Wheaton, IL 60187, within 30 days of your township's assessment roll publication. While forms can be downloaded online, DuPage County does not currently offer electronic filing.

What is the homestead exemption worth in DuPage County?

The General Homestead Exemption in DuPage County reduces your equalized assessed value by $8,000, which typically saves homeowners about $584 annually depending on local tax rates. This exemption is available on your principal residence and is typically granted automatically by your Township Assessor without requiring a formal application. If you are 65 or older, you qualify for an additional Senior Citizens' Homestead Exemption worth another $8,000 reduction in assessed value. You may also qualify for the Senior Assessment Freeze if your household income is $65,000 or less, which freezes your assessed value at the level when you turned 65 and can save thousands of dollars over time as property values increase.

What evidence do I need to win a property tax appeal in DuPage County?

The strongest evidence for a DuPage County appeal includes 3-5 comparable sales from the prior 3 years showing similar properties in your neighborhood that sold for less than your assessed value. A recent professional appraisal is also powerful evidence, as is a recent sale of your own property. For market value appeals, focus on properties that sold recently and are similar in size, age, condition, and location. You should also bring photographs documenting your property's condition, especially any defects, damage, or outdated features. Assessment values in DuPage County are based on the three prior years of actual sales transactions, so your comparable sales should fall within that timeframe for maximum impact at your Board of Review hearing.

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

The savings from a successful appeal depend on how much your assessed value is reduced and DuPage County's effective tax rate of approximately 2.09%. For example, if you successfully reduce your assessed value by $10,000, you would save about $209 annually in property taxes. On the typical DuPage County home valued near $374,100 with median annual taxes of $7,833, even a 10% over-assessment means you're overpaying about $783 per year. Because the reduced assessment value carries forward to future years, the long-term savings compound significantly. Some DuPage County homeowners have achieved reductions of $20,000 to $50,000 in assessed value, translating to annual savings of $400 to $1,000 or more.

When will I receive a decision on my DuPage County property tax appeal?

Written decisions from the DuPage County Board of Review are mailed after all hearings for the entire county are completed, which typically occurs the following March. For example, appeals filed for the 2025 tax year had decision notices mailed on March 18, 2026. No decisions are released prior to the completion of all county hearings. If you are not satisfied with the Board of Review's decision, you have 30 days from the date you receive the decision notice to file an appeal with the Illinois Property Tax Appeal Board (PTAB) or with the Circuit Court. The PTAB appeal forms are available for download on their website, and this second level of appeal offers another opportunity to reduce your assessment.

What is the assessment ratio for residential properties in DuPage County?

All residential properties in DuPage County are assessed at 33.33% of their fair market value, as required by Illinois state law. This means your assessed value is approximately one-third of what your home would sell for on the open market. For example, if your home has a market value of $374,100, your assessed value would be approximately $124,700 before any exemptions are applied. After applying the $8,000 General Homestead Exemption, your equalized assessed value would be $116,700, which is the figure used to calculate your actual property tax bill. The Illinois Department of Revenue may also apply an equalization factor to ensure assessment levels are consistent across all counties in the state.

Can I appeal my DuPage County property taxes if I just bought my home?

Yes, a recent purchase can be excellent evidence for a property tax appeal in DuPage County if you paid less than the assessed market value. Your actual purchase price is strong evidence of true market value, especially if the sale was an arm's-length transaction and occurred recently. When filing your appeal with the Board of Review, include a copy of your closing statement (HUD-1 or settlement statement) showing the purchase price, along with documentation that the sale was a fair market transaction without unusual circumstances like family sales, foreclosures, or distressed conditions. Recent sales of your property are considered some of the best evidence according to DuPage County guidance. However, you still must file your appeal within 30 days of your township's assessment roll publication date.

Official Resources

DuPage County Supervisor of Assessments Official Website →

Official county website with appeal forms, exemption applications, assessment information, and township deadline calendars.

DuPage County Property Lookup Portal →

Search your property by address or parcel number to view current assessment, tax history, and property characteristics.

DuPage County Board of Review Information →

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

Illinois Property Tax Appeal Board (PTAB) →

State-level appeals board for second-level appeals after Board of Review decisions, with forms and filing instructions.

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

Adams County (Quincy)Champaign County (Champaign)Cook County (Chicago)DeKalb County (DeKalb)Grundy County (Morris)Jefferson County (Mount Vernon)

← All Illinois property tax appeal info

Sources: https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/ | https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/board_of_review/ | https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/appeal_process.php | https://propertytaxrates.org/counties/illinois/dupage-county/ | https://www.dupagecounty.gov/elected_officials/treasurer/tax_information/ | https://www.dupagecounty.gov/government/departments/supervisor_of_assessments/exemptions/ | https://smartasset.com/taxes/illinois-property-tax-calculator

Last verified: 2026-07-24