Kendall County Property Tax Appeal, Illinois

Travis Bunn·Updated July 22, 2026

Kendall County is located in the Chicago metropolitan area with Yorkville serving as the county seat and a population of approximately 146,000 as of 2025. The county was the fastest-growing county in the United States between 2000 and 2010, and major population centers include Oswego (the most populous municipality with about 40,795 residents), Yorkville, Montgomery, and Plano. Property tax appeals are particularly important in Kendall County due to the significantly higher tax burden compared to state and national averages, the median annual property tax bill is roughly three times the national median of $2,400. With a median home value of approximately $322,400 and an effective tax rate of 2.16%, homeowners face one of the highest property tax burdens in the nation, ranking 29th among all U.S. counties.

Notable cities: Yorkville, Oswego, Montgomery, Plano

Median Home

$322,400

Tax Rate

2.16%

Annual Tax

$8,090

Population

146,113

On the typical Kendall County home, valued near $322,400 at the county’s effective tax rate of 2.16%, 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 from the date your township's assessment notice is published in the newspaper

Assessment notices are typically published in mid-September each year. For the 2026 assessment year (affecting your 2027 tax bill), notices will be published in September 2026, and you will have 30 days from that publication date to file your appeal with the Kendall County Board of Review. After this 30-day window closes, the Board of Review is prohibited by law from accepting assessment complaints.

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

How Kendall County Assesses Property

33.33%of market value

Assessed by: Kendall County Supervisor of Assessments

Assessment cycle: annual

Notices typically mailed: mid-September

In Kendall County, property is assessed at 33.33% of its fair market value as mandated by Illinois law. For example, if your home's market value is $322,400 (the county median), your assessed value would be $107,453 ($322,400 × 0.3333). After applying the $6,000 general homestead exemption, your taxable assessed value would be $101,453. At Kendall County's effective tax rate of 2.16%, this would result in an annual tax bill of approximately $2,191.

The Appeal Process

Appeals are heard by the Board of Review. At a Kendall County Board of Review hearing, you will be formally sworn in as a witness by the Clerk of the Board of Review and given the opportunity to present your case under oath. You'll present your evidence, including comparable sales, photographs, and any other documentation supporting your opinion of fair market value, and the Board will issue a written decision.

Step 1: Contact your township assessor for an informal review. This can often be initiated by email and may resolve your concerns without needing to file a formal appeal with the Board of Review.

Step 2: Gather evidence to support your appeal, including comparable sales from the past 3 years (focusing on sales from 2023, 2024, and 2025 for the 2026 assessment), photographs of your property showing any issues or defects, recent appraisals, and documentation of needed repairs.

Step 3: Download the Board of Review Assessment Appeal Form from https://www.kendallcountyil.gov/offices/assessments/forms and complete it with your property information, current assessed value, and your opinion of fair market value.

Step 4: File your appeal with the Kendall County Board of Review within 30 days of your township's assessment notice publication date. Submit via mail to 111 W Fox Street, Yorkville, IL 60560 or in person during business hours.

Step 5: Attend the Board of Review hearing. After filing, you will be scheduled for a formal hearing where you will be sworn in as a witness and present your evidence under oath. The Board will review your case and issue a written decision.

Step 6: If dissatisfied with the Board of Review decision, you can appeal to the Illinois Property Tax Appeal Board (PTAB) at www.ptab.illinois.gov within 30 days of the Board's written decision.

Step 7: As a final resort, if the PTAB decision is unfavorable, you may appeal to the Circuit Court within 35 days of the PTAB decision.

Required form: Board of Review Assessment Appeal Form (available at https://www.kendallcountyil.gov/offices/assessments/forms)

Filing Methods

online:Download forms at https://www.kendallcountyil.gov/offices/assessments/forms

mail:Mail completed forms to Kendall County Board of Review, 111 W Fox Street, Yorkville, IL 60560

in-person:Submit forms in person at 111 W Fox Street, Yorkville, IL 60560 during business hours (Monday-Friday 8:00am-4:30pm)

Evidence to Bring

Comparable sales data from properties in your neighborhoodRecent property appraisalPhotographs showing property condition or defectsRepair estimates for needed workProperty record card from the assessor's officeDocumentation of property characteristics

Kendall County Assessor Contact

Kendall County Supervisor of Assessments

Website: https://www.kendallcountyil.gov/offices/assessments

Online Portal: https://www.kendallcountyil.gov/offices/assessments/forms

Hours: Monday-Friday 8:00am-4:30pm

Tax Exemptions in Kendall County

General Homestead Exemption

$6,000 reduction in EAV (approximately $170 annual tax savings at 2.83% effective rate)

Reduces the property's equalized assessed value (EAV) for owner-occupied primary residences

Eligibility: Must own and occupy the property as your primary residence as of January 1 of the assessment year. Your driver's license must reflect the property address.Deadline: Apply once; contact Kendall County Supervisor of Assessments at 630-553-4146

Senior Citizens Homestead Exemption

$5,000 reduction in EAV (approximately $141 annual tax savings)

Additional exemption for homeowners age 65 and older

Eligibility: Must be 65 years or older during the assessment year, own and occupy the property as primary residence on January 1Deadline: Contact Kendall County Supervisor of Assessments at 630-553-4146

Senior Citizens Assessment Freeze Homestead Exemption

Freezes the equalized assessed value at the base year amount

Freezes assessed value increases for qualifying senior citizens

Eligibility: Must be 65 or older during the assessment year, have total household income of $65,000 or less, responsible for paying property taxes, and property must be primary residenceDeadline: Annual application required; contact Kendall County Supervisor of Assessments at 630-553-4146

Disabled Veterans' Standard Homestead Exemption

$2,500 for 30-49% disability; $5,000 for 50-69% disability; first $250,000 of assessed value exempt for 70% or higher disability

Exemption for veterans with service-connected disabilities certified by the U.S. Department of Veterans' Affairs

Eligibility: Veteran with service-connected disability; must own and occupy as primary residence. If rated 70% or greater, the first $250,000 of assessed value is exempt.Deadline: Annual application required unless deemed 100% Total and Permanently disabled; contact Kendall County Supervisor of Assessments at 630-553-4146

Disabled Persons' Homestead Exemption

$2,000 reduction in EAV

Provides reduction in property's EAV for qualifying property owned by a disabled person

Eligibility: Property must be owned by a qualifying disabled person and occupied as primary residenceDeadline: Annual application required; contact Kendall County Supervisor of Assessments at 630-553-4146

Returning Veterans' Homestead Exemption

Varies based on circumstances

Exemption for veterans returning from active duty in an armed conflict during the assessment year

Eligibility: Illinois resident who served in U.S. Armed Forces, Illinois National Guard, or U.S. Reserve Forces and is returning from active duty in an armed conflict during the assessment year. Must own or have legal interest in property as principal residence on January 1.Deadline: Contact Kendall County Supervisor of Assessments at 630-553-4146

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Frequently Asked Questions

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

The deadline to file a property tax appeal in Kendall County is 30 days from the date your township's assessment notice is published in the newspaper. Assessment notices are typically published in mid-September each year. For the 2026 assessment year (which affects your 2027 tax bill), notices will be published in September 2026, and you will have exactly 30 days from that publication date to file your appeal with the Kendall County Board of Review. After this 30-day window closes, the Board of Review is prohibited by law from accepting assessment complaints for properties in your township, so it is critical to act quickly once you receive your notice.

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

While Kendall County does not currently offer a fully online appeal filing portal, you can access all necessary forms and instructions online at https://www.kendallcountyil.gov/offices/assessments/forms. Download the Board of Review Assessment Appeal Form, complete it with your property information, current assessed value, and your opinion of fair market value, then submit it either by mail to 111 W Fox Street, Yorkville, IL 60560 or in person during business hours (Monday-Friday 8:00am-4:30pm). Before filing a formal appeal, consider contacting your township assessor for an informal review, which can often be initiated by email and may resolve your concerns without needing to file with the Board of Review.

What is the homestead exemption worth in Kendall County?

The General Homestead Exemption in Kendall County reduces your property's equalized assessed value (EAV) by $6,000, which is the amount used to calculate your tax bill. On a typical property with Kendall County's effective tax rate of approximately 2.16%, this $6,000 exemption saves homeowners around $130-170 per year in property taxes. If you are 65 or older, you can also qualify for an additional Senior Citizens Homestead Exemption worth $5,000 in EAV reduction (approximately $108-141 in annual tax savings). To receive any homestead exemption, your driver's license must reflect the property address, and you must occupy it as your principal residence.

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

At a Kendall County Board of Review hearing, you will be formally sworn in as a witness by the Clerk of the Board of Review and given the opportunity to present your case under oath. You'll present your evidence, including comparable sales from the past three years, photographs of your property showing any issues or defects, recent appraisals, and any other documentation supporting your opinion of fair market value. The Board members will review your evidence and may ask questions about your property or the comparables you've provided. After the hearing, the Board will review your case and issue a written decision, which may reduce, maintain, or in rare cases increase your assessed value.

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

The potential savings from a successful property tax appeal in Kendall County depends on how much your property is over-assessed. With Kendall County's effective tax rate of approximately 2.16% and a median home value of $322,400, even a 10% reduction in assessed value could save you approximately $700 per year in property taxes. For example, if your home is assessed at $350,000 but should be assessed at $315,000 (a 10% reduction), at the county's 33.33% assessment ratio and 2.16% effective rate, you would save around $750 annually. Over several years, these savings can add up to thousands of dollars, making the appeal process well worth the effort.

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

For a successful Kendall County property tax appeal, you need comparable sales data from properties in your neighborhood that sold within the past three years, particularly focusing on sales from 2023, 2024, and 2025 for the 2026 assessment year. Illinois statute mandates the use of sales studies for the three most recent years preceding the assessment year. You should also provide photographs showing your property's condition or any defects, a recent independent appraisal if available, repair estimates for needed work, and your property record card from the assessor's office. The most compelling evidence is typically recent comparable sales from your immediate area that show lower values than your assessment suggests.

Can I appeal my Kendall County property taxes if I disagree with the Board of Review decision?

Yes, if you are dissatisfied with the Kendall County Board of Review decision, you have the right to appeal to the Illinois Property Tax Appeal Board (PTAB), a state-level quasi-judicial body that provides an unbiased forum to contest property assessments. You must file your PTAB appeal within 30 days of receiving the Board of Review's written decision. You can file your PTAB appeal online at www.ptab.illinois.gov. If the PTAB decision is also unfavorable, you may further appeal to the Circuit Court within 35 days of the PTAB decision. Each level of appeal provides an additional opportunity to present evidence and argue for a fair assessment.

Should I contact my township assessor before filing a formal appeal in Kendall County?

Yes, it is highly recommended to contact your township assessor for an informal review before filing a formal appeal with the Kendall County Board of Review. This informal review can often be initiated by email and may resolve your concerns without needing to file a formal appeal. Township assessors can review your property's assessment, explain how they arrived at the value, and sometimes make corrections right at the assessor's office if they agree your assessment is incorrect. If you reach an agreement with the township assessor, you can avoid the formal hearing process entirely. However, if after talking to the township assessor you still feel your assessment is not correct, you have the right to file a formal appeal with the Board of Review within the 30-day deadline.

Official Resources

Kendall County Supervisor of Assessments Website →

Official website with information on assessments, exemptions, and property records for Kendall County.

Kendall County Board of Review Forms and Information →

Download appeal forms, exemption applications, and access instructions for filing property tax appeals.

Illinois Property Tax Appeal Board (PTAB) →

State-level appeal board for contesting Board of Review decisions with online filing portal.

Kendall County Property Tax Inquiry System →

Search and view property assessment information, tax bills, and property characteristics for parcels in Kendall County.

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 →

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← All Illinois property tax appeal info

Sources: https://www.kendallcountyil.gov/offices/assessments | https://www.kendallcountyil.gov/offices/assessments/forms | https://www.tax-rates.org/illinois/kendall_county_property_tax | https://datausa.io/profile/geo/kendall-county-il | https://www.ownwell.com/trends/illinois/kendall-county | https://worldpopulationreview.com/us-counties/illinois/kendall-county

Last verified: 2026-07-22