Kendall County, IL: Property Taxes, Farmland and CPA Help

Kendall County, with Yorkville as its seat, sits at the southwest edge of the Chicago suburbs. It is a smaller county than its neighbors, with a mix of new subdivisions and working farmland, and a few quirks in its tax picture that set it apart from DuPage, Kane and Will. This page covers how Kendall County property taxes work, what is different here, and where a CPA can help.

What sets Kendall apart

• Lower exemption tier. The state allows a larger general homestead reduction in Cook and the counties that touch it. Kendall falls in the standard tier: up to $6,000 off assessed value for the general homestead exemption and up to $5,000 for the senior homestead exemption.
• Earlier assessment calendar. State law gives township assessors in counties under 600,000 residents until June 15 to return their assessment books, months earlier than DuPage's November 15. Assessment notices there generally come earlier in the year.
• No regional transit tax. The six counties covered by the transit sales tax are Cook, DuPage, Kane, Lake, McHenry and Will. Kendall is not on that list, so its combined sales tax rate is lower than a Will or Kane address with the same local rates.
• Local grocery tax option. Since January 1, 2026 the state's 1% grocery tax is gone, and counties and municipalities may adopt a local 1% grocery tax by ordinance. Whether it applies depends on the address, so use the state's tax rate finder.

Bills and due dates

Kendall mails one bill for the full year, payable in two equal installments. The county notice for 2025 taxes (billed in 2026) showed a bill mailing on May 5 and installments due June 9 and September 9, 2026. Illinois makes you responsible for the tax even if a bill does not arrive, so call the Collector in Yorkville if yours is missing. Late installments accrue a monthly penalty, and personal checks stop being accepted late in the season. Look at your own bill for the exact cutoffs.

Exemptions and the senior freeze

Beyond the general and senior homestead exemptions, Illinois offers a $2,000 reduction for owners with disabilities, tiered exemptions for veterans with service-connected disabilities and a returning veterans exemption. The low-income senior assessment freeze has a household income limit that rises to $75,000 for the 2026 assessment year. Each program has its own application and renewal rules, so ask your township assessor or the Supervisor of Assessments.

Farmland and country homes

Farm acreage is assessed on its income-producing ability, called agricultural economic value, rather than on what a developer might pay. Farm buildings are assessed at one-third of the value they add to the farm, while farm dwellings and home sites are assessed at one-third of market value. If you inherited a farm or are splitting off a lot, how the land is classified matters.

Appeals

Start with the township assessor, then file a complaint with the Board of Review in the window printed on your assessment notice. A Board of Review decision can be appealed to the Property Tax Appeal Board within 30 days of the postmark. Appeals address the assessment, not the rate.

Towns in Kendall County

Kendall County includes Yorkville, Oswego, Montgomery (shared with Kane County) and part of Plainfield.

How we can help

We help new homeowners confirm their exemptions, help builders and trades with business tax preparation and payroll, and review farmland and rental situations. For decisions about your own property, talk with a qualified professional.

Frequently asked questions

General information only, not tax, legal or accounting advice for your situation. Rules, limits and deadlines change; confirm the current rules with the official source or a qualified professional before you act. Reading this page does not create a professional relationship with CPA Tax Payroll and Accounting Corp.