Kane Property Tax: Rates, Deadlines & Appeal (2026)

As of July 30, 2026, Kane’s appeal deadlines are township-by-township. The next official 2026 Board of Review deadlines are August 17, 2026 for Big Rock and Geneva townships and August 24, 2026 for Sugar Grove; Aurora, Batavia, Burlington, Campton, Elgin, Hampshire, Kaneville, Plato, Rutland and Virgil were still listed as TBD on the county deadline page. File the paper complaint with the Kane County Board of Review, 719 Batavia Avenue, Building C, Geneva, IL 60134-3000—not by email and not through the evidence portal.

How assessments work in Kane

Kane County is in the fourth and final year of the 2023–2026 quadrennial assessment cycle. For the 2026 assessment year, the valuation date is January 1, 2026, and Kane’s Board of Review rules say assessments should reflect one-third of fair cash value, generally using sales from 2023, 2024 and 2025. The township assessor sets the local assessment, the Kane County Supervisor of Assessments applies oversight/equalization, and the County Clerk later applies tax rates after values are certified.

That matters because an assessment appeal is not a complaint that your tax bill is too high, that school levies are too high, or that your assessment increased too much. Kane’s rules specifically say the Board looks at assessment issues: overvaluation, unequal assessment compared with similar properties, incorrect physical data, or whether the property qualifies for preferential assessment.

Appeal timing starts when your township’s assessment changes are published in a local newspaper. The rule is 30 calendar days after the publication date. The county’s official 2026 deadline page currently shows: Dundee—July 9, Saint Charles—July 20, Blackberry—July 27, Big Rock—August 17, Geneva—August 17, Sugar Grove—August 24, and the remaining townships as TBD.

Whether you should appeal

Start with your assessment notice or the county property search. Convert the assessment back to market value by multiplying the assessed value by about 3. If the county says your home’s fair cash value is materially higher than what similar nearby homes sold for around 2023–2025, you may have an overvaluation case.

The strongest Kane evidence is local and specific: recent sales of similar homes in the same neighborhood, same school/tax area if possible, and similar size, age, lot, condition and style. Kane’s complaint form asks you to put your best comparables on the grid; the Board’s FAQ warns that failing to complete the comparable grid can significantly reduce the chance of a reduction unless you attach a complete appraisal.

Also check physical data. If the property record card says you have 2,600 square feet but you have 2,250, or lists a finished basement, extra bath, outbuilding or condition that is wrong, contact the township assessor quickly. Kane’s rules strongly encourage talking with the township assessor before filing—but they also warn that talking to the assessor does not extend the filing deadline.

Do not rely on county-published “success rates” unless you can find one for the current year. In the official county sources reviewed for this guide, Kane publishes deadlines, rules, reports and hearing procedures, but I did not find a current official median reduction or homeowner win-rate table.

Step-by-step how to file

1. Find your township deadline. Use the Kane County Assessment Office deadline page. If your township is still TBD, subscribe to county updates and check the page frequently; the appeal window can be short.

2. Get the right form. Most homeowners use the Residential/Farm Assessment Complaint form from the Kane County Assessment Complaints page. Condo or HOA-wide filings may use the Association Assessment Complaint Form. If one property has multiple parcel numbers, include the Multi-Parcel Addendum. Individual condo owners should use the Residential/Farm form, not the association form.

3. Pick your hearing option. The form lets you choose a Standard Hearing or Streamlined Hearing. Standard means you appear by telephone or video conference. Streamlined means the Board decides from written evidence only. If you do not select an option, Kane’s rules say the complaint will be scheduled as streamlined if it qualifies. Streamlined is limited to complaints seeking an equalized assessed value reduction of less than $100,000.

4. Prepare evidence. Include your best comparable sales, closing statement if you recently bought the home, appraisal if you have one, photos for condition issues, and documentation for wrong property characteristics. For a recent sale, Kane requires disclosure of purchase price and sale date if the purchase occurred on or after the rules’ stated cutoff date.

5. File the complaint on paper. Kane’s evidence portal says it cannot be used for the initial complaint. Initial assessment complaints must be filed on paper by U.S. Mail, private courier, or in person at the Board of Review office in Geneva. The mailing/in-person address is:

Kane County Board of Review
719 Batavia Avenue, Building C
Geneva, IL 60134-3000

U.S. Mail filings count by postmark. Private courier filings count by the shipper tracking date. Faxed and emailed complaint forms are not accepted. Kane’s official complaint materials reviewed here do not list a filing fee.

6. Use the evidence portal only after filing. Kane’s Electronic Evidence Submission portal is only for evidence after an assessment complaint has already been filed. It opens after that township’s 30-day filing window ends and remains available for 14 days after the final filing deadline.

What happens after

The appeal authority is the Kane County Board of Review. Regular meetings and hearings are at the Kane County Government Center, Building C, 719 Batavia Avenue, Geneva, although standard complaint hearings are conducted by teleconference or video conference using Zoom.

For a standard hearing, the taxpayer or attorney presents testimony and answers Board questions; the township assessor or representative may also present testimony; each side may make closing or rebuttal remarks. Most standard hearings are scheduled in 15-minute intervals, so your evidence must be organized. Kane’s rules say the Board usually gives an oral decision after the hearing closes, but the official final decision is issued later in writing.

For a streamlined hearing, nobody appears. The Board reviews the written evidence from the taxpayer and assessor. After all standard and streamlined hearings are completed, official findings are mailed to complainants and respondents. Kane’s prior rules FAQ described final notices as typically arriving in late winter or early spring after the hearing season; for 2026, expect written findings after the Board finishes the 2026 complaint docket.

If you disagree with the Board of Review’s final valuation decision, the next level is the Illinois Property Tax Appeal Board, but that is a separate appeal.

Local tips

Check exemptions before you appeal. A valuation appeal lowers the assessed value; exemptions lower taxable EAV. Kane’s 2026 assessor instructions list a General Homestead Exemption up to $8,000 off EAV, a Senior Citizens Homestead Exemption up to $8,000, a Senior Freeze with a $75,000 household income limit for tax year 2026, a Persons with Disabilities Homestead Exemption of $2,000, disabled veterans exemptions from $2,500 to full EAV depending on rating, and a $5,000 Returning Veterans exemption. Kane also announced an online exemption portal for several homestead exemptions.

Worked savings example using Kane’s tax bill rate format. Kane’s 2025-payable-2026 tax bill explainer shows a sample total tax rate of 7.376208. Illinois tax rates are applied per $100 of EAV. Suppose your home is assessed at $150,000 AV, receives the $8,000 General Homestead Exemption, and has taxable EAV of $142,000. You prove a lower fair cash value that reduces AV to $140,000, making taxable EAV $132,000. The EAV reduction is $10,000. Estimated tax savings: $10,000 × 7.376208 ÷ 100 = $737.62 for that tax year. Your actual savings will use your parcel’s own tax-code rate, which may be higher or lower.

Do not wait for the tax bill. Kane’s bills are payable the year after assessment. By the time you see the 2026 assessment reflected on a 2027 bill, the Board of Review filing window for the 2026 assessment year will already be over.

Kane Property Tax Rate

There is no single countywide homeowner property-tax rate in Kane County; rates are specific to the property’s tax code/local taxing districts. The Kane County Assessment Office states that Kane County tax rates generally range from about 6.50% to 11.25%, with a median rate of 9.00%, and may be higher in special-service areas. Using the county’s example of a $225,000 home and a 9.00% estimated tax rate: tax dollars due are shown as $6,749 without exemptions and $3,659 with General, Senior Citizen, and Senior Freeze exemptions, for estimated exemption savings of $3,090.

Source: https://assessments.kanecountyil.gov/Pages/Exemptions.aspx

When Are Property Taxes Due in Kane?

For 2025 taxes payable in 2026, Kane County real estate tax bills are paid in two installments: first installment due June 1, 2026; second installment due September 1, 2026. Two installments; the Kane County Treasurer’s 2025-payable-2026 penalty schedule shows 0% penalty for payments on or before June 1 for the first installment and through September 1 for the second installment, with penalties beginning after those dates.

This is not the same as the assessment appeal deadline above. The appeal deadline is your window to contest your assessed value; the payment due date is when the resulting tax bill must be paid. Missing one does not affect the other, but missing either has real consequences — one forfeits your right to appeal for the year, the other can trigger penalties and interest.

Source: https://treasurer.kanecountyil.gov/Pages/press.aspx

Property Tax Exemptions in Kane

• General Homestead Exemption — Owner-occupied principal residence; exemptions may also be available for cooperatives and qualified life-care facilities.. Reduces Equalized Assessed Value (EAV) by $8,000 for the current tax assessment year. Yes, initial application with the County Assessment Office; online exemption portal available. After initial approval, generally renews automatically if eligibility continues. Apply by November 30 of the year for which the exemption is requested, unless otherwise set by statute or ordinance.. (Source: https://assessments.kanecountyil.gov/Pages/General-Homestead.aspx)
• Senior Citizen Homestead Exemption — Principal residence of an owner who is 65 or older by December 31 of the tax assessment year; exemptions may also be available for cooperatives and qualified life-care facilities.. Reduces EAV by $8,000 for the current tax assessment year. Yes, initial application with the County Assessment Office; after initial approval, this exemption automatically renews. Apply by November 30 of the year for which the exemption is requested, unless otherwise set by statute or ordinance.. (Source: https://assessments.kanecountyil.gov/Pages/Senior-Homestead.aspx)
• Low-Income Senior Citizen Assessment Freeze Homestead Exemption — Principal residence of an owner who is 65 or older by December 31 of the assessment year, has used the property as principal residence for the beginning of two consecutive years, and meets household income limits.. Freezes the assessment at a base year, preventing the net assessment from increasing; it freezes assessment, not taxes. Income limit is $65,000 for 2025 payable 2026; beginning 2026 payable 2027, the limit is $75,000. Yes, apply with the County Assessment Office; after initial approval, renewal form is mailed each subsequent year. Apply by November 30 of the year for which the exemption is requested, unless otherwise set by statute or ordinance.. (Source: https://assessments.kanecountyil.gov/Pages/Senior-Assessment-Freeze.aspx)
• Persons with Disabilities Homestead Exemption — Taxpayer unable to engage in substantial gainful activity because of a medically determinable physical or mental impairment expected to result in death or last at least 12 months; property must be primary residence as of January 1, taxpayer must be liable for taxes, and must have ownership/legal interest. Cannot also claim the Disabled Veterans Homestead Exemption.. Reduces EAV by $2,000 for the current tax year. Yes, apply through the County Assessment Office/online exemption portal; first-time applicants must provide qualifying proof of disability. Apply by November 30 of the year for which the exemption is requested, unless otherwise set by statute or ordinance.. (Source: https://assessments.kanecountyil.gov/Pages/Persons-with-Disabilities.aspx)
• Veterans with Disabilities Homestead Exemption — Illinois resident veteran who served in qualifying U.S. Armed Forces/National Guard/Reserve service, was not dishonorably discharged, has at least a 30% service-connected disability certified by the U.S. Department of Veterans Affairs, and owns and occupies the home as of January 1 of the assessment year.. Reduces EAV by $2,500 for 30%-49% service-connected disability; $5,000 for 50%-69%; and all EAV up to $250,000 for at least 70% service-connected disability. Yes, apply through the online exemption portal or County Assessment Office; after initial approval, annual renewal form is mailed. Apply by November 30 of the year for which the exemption is requested, unless otherwise set by statute or ordinance.. (Source: https://assessments.kanecountyil.gov/Pages/Veterans-with-Disabilities.aspx)
• Returning Veterans' Homestead Exemption — Illinois resident veteran returning from active duty in an armed conflict during the assessment year, with ownership/legal/equitable interest in the principal residence as of January 1 and liability for property taxes; a veteran who dies during active duty service is also eligible.. One-time $5,000 EAV reduction for a qualifying returning veteran for the current tax assessment year. Yes, apply with the County Assessment Office; after initial approval, renewal form is mailed each subsequent year. Apply by November 30 of the year for which the exemption is requested, unless otherwise set by statute or ordinance.. (Source: https://assessments.kanecountyil.gov/Pages/Returning-Veterans.aspx{)

How to Look Up Your Property Record in Kane

You can look up your property's official record at https://kaneil.devnetwedge.com/Search/ExecuteParcelSearch. Kane County Property Tax Inquiry lets users search by parcel number, owner name, address, sale criteria, tax year, township/tax district/property class and related criteria; the Treasurer’s official site links to it as Property Tax Lookup/Print a Property Tax Bill.