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Updated 2025 Tax Year

Kendall County
Property Tax Guide

Everything you need to know about property taxes in Kendall County, IL. Rates, due dates, exemptions, and how it affects your monthly payment.

9 Official Sources
8 min read
Quick Facts
Tax Rate
Varies significantly by location due to overlapping taxing districts, typically 2-4% effective rate
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Kendall County, Illinois operates under a property tax system that funds essential local services including schools, townships, municipalities, fire protection districts, and county operations. Property taxes are the primary revenue source for these local governments, with school districts typically representing the largest portion of your tax bill. The county follows Illinois state law, including the Property Tax Extension Limitation Law (PTELL), which limits annual tax levy increases.

Effective property tax rates in Kendall County vary significantly by location within the county due to the overlapping special taxing districts that serve different areas. Your specific tax rate depends on which school district, township, municipality, fire district, and other special districts serve your property. The statewide average effective rate is approximately 2.27%, but your actual rate may be higher or lower depending on your specific district combination and any tax credits you qualify for and apply to receive.

Property taxes are assessed annually and collected in two installments. The assessment process involves determining your property's market value, applying the appropriate assessment level, and then applying any qualifying tax credits to reduce your final tax bill. It's important to note that most tax credits require annual application and are not automatically applied to your property.

Section 2

What Makes Up Your Tax Bill

Property tax rates in Kendall County are composed of multiple levies from overlapping taxing districts. The following represents typical components, though exact rates vary by location:

ComponentTypical Rate RangeDescription
School Districts6.000% - 8.000%Elementary and high school district levies
County0.400% - 0.600%General county operations and services
Township0.200% - 0.400%Township road maintenance and general assistance
Municipality0.300% - 0.800%City or village services (where applicable)
Fire Protection0.300% - 0.600%Fire district or municipal fire services
Library District0.200% - 0.400%Public library services
Park District0.200% - 0.500%Parks and recreation services
Special Districts0.100% - 0.300%Drainage, conservation, or other special services

Note: These rates apply to the assessed value (not market value) and represent the levy year 2024-2025. Final 2025-2026 rates are determined after October 20, 2025, when final assessments are completed. Your specific rate combination depends entirely on which districts serve your property location.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Kendall County, property taxes are due in two installments:

First Installment
Jun 1
Delinquent after Dec 10
Second Installment
Sep 1
Delinquent after Apr 10
Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental property taxes in Kendall County are additional tax bills issued when there are significant changes to a property during the tax year. The most common triggers include new construction completion, major improvements or additions, and changes in property ownership that reveal previously unreported improvements or changes in use classification.

When supplemental taxes are issued, they represent the difference between what was originally assessed and billed versus what should have been assessed based on the property's actual condition. For example, if you complete a home addition worth $50,000 in market value during the tax year, a supplemental bill would be calculated on the additional assessed value (typically $50,000 × 33.33% assessment ratio = $16,665 additional assessed value) multiplied by your local tax rate.

The supplemental tax covers the portion of the tax year from when the change occurred until the end of the tax year. If your addition was completed in March and your total tax rate is 8.000%, you would owe approximately ($16,665 × 0.08000) × (10 months ÷ 12 months) = $1,111 in supplemental taxes. These bills are typically issued within 30-60 days of the change being identified and processed.

Example Calculation

The following examples show estimated annual property taxes for Kendall County properties, assuming typical district combinations. Actual taxes vary by specific location and applied tax credits:

$300,000 Home Example:

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less: General Homestead Exemption: -$10,000
  • Net Taxable Assessed Value: $90,000
  • Tax Rate (estimated): 7.500%
  • Annual Tax: $6,750
  • Monthly (if escrowed): $562.50

$600,000 Home Example:

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less: General Homestead Exemption: -$10,000
  • Net Taxable Assessed Value: $190,000
  • Tax Rate (estimated): 7.500%
  • Annual Tax: $14,250
  • Monthly (if escrowed): $1,187.50

$1,000,000 Home Example:

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,333
  • Less: General Homestead Exemption: -$10,000
  • Net Taxable Assessed Value: $323,333
  • Tax Rate (estimated): 7.500%
  • Annual Tax: $24,250
  • Monthly (if escrowed): $2,020.83

Important Notes: The General Homestead Exemption requires annual application and reduces your equalized assessed value by up to $10,000. Additional tax credits may be available for seniors, veterans, or disabled persons, but all require separate applications with specific deadlines.

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Section 5

Escrow & Property Taxes

Most mortgage lenders require property tax escrow accounts for borrowers with less than 20% down payment, though some borrowers choose escrow for convenience even when not required. Your lender estimates annual property taxes and divides this amount into monthly payments added to your mortgage payment. The lender then pays your property taxes directly to Kendall County when due.

Kendall County property taxes are due in two installments: the first installment due June 4, 2025, and the second installment due September 4, 2025, for the 2025 tax year. Lenders typically pay each installment shortly before the due date. If your property taxes increase significantly from year to year, your lender may require an escrow shortage payment or increase your monthly escrow amount.

You should receive an annual escrow analysis from your lender showing escrow account activity and any required adjustments. It's important to review your actual tax bills even when using escrow to ensure accuracy and to apply for any tax credits you may qualify for. If you pay taxes directly without escrow, you're responsible for making timely payments to avoid penalties and interest charges.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Kendall County for 2025? A: Property taxes for the 2025 tax year are due in two installments: first installment due June 4, 2025, and second installment due September 4, 2025. These dates are set annually and may vary slightly from year to year.

Q: What tax credits are available and do they require application? A: The primary tax credit is the General Homestead Exemption, which reduces your assessed value by up to $10,000 and requires annual application. Additional credits include the Senior Citizens Assessment Freeze Homestead Exemption, Senior Citizens Tax Deferral, Veterans with Disabilities Exemption, and Disabled Persons Homestead Exemption. All tax credits require separate applications with specific deadlines.

Q: How does the Homestead Exemption work? A: The General Homestead Exemption reduces your equalized assessed value by up to $10,000, which decreases your tax bill. This is different from a homestead credit that caps assessment increases. You must own and occupy the property as your primary residence and file an annual application. The exemption is not automatic and must be applied for each year.

Q: What are the penalties for late property tax payments? A: Illinois law imposes penalties and interest on late property tax payments. Penalties typically include a 1.5% monthly interest charge on unpaid amounts, with additional penalties for significantly delinquent payments. Properties with multiple years of unpaid taxes may be subject to tax sale proceedings.

Q: How often are properties reassessed in Kendall County? A: Properties in Kendall County are reassessed every three years as part of the Illinois assessment cycle. However, the county may conduct interim assessments for new construction, major improvements, or other significant changes to property conditions between general reassessment years.

Q: How do I appeal my property assessment? A: Property assessment appeals in Kendall County must be filed with the Board of Review during the specified appeal period, typically in summer months. You can appeal based on overvaluation, lack of uniformity, or incorrect property information. Appeals require supporting documentation such as recent appraisals, comparable sales, or evidence of property condition issues.

Q: Can I pay my property taxes online? A: Yes, Kendall County offers online property tax payments through their official website. You can pay using MasterCard or other accepted payment methods. Online payments may include convenience fees, and you should verify the exact payment amount from your official tax bill.

Q: Why do property tax rates vary within Kendall County? A: Property tax rates vary significantly within Kendall County because different areas are served by different combinations of school districts, municipalities, townships, fire districts, library districts, and other special taxing districts. Each district sets its own levy, creating unique tax rate combinations for different geographic areas.

Q: What happens if my mortgage company doesn't pay my taxes on time? A: If your mortgage servicer fails to pay your property taxes from escrow by the due date, contact them immediately to resolve the issue. You may need to pay the taxes directly and seek reimbursement from your servicer. Document all communications and consider filing complaints with your state banking regulator if the servicer doesn't respond appropriately.

Q: How do I apply for the Senior Citizens Assessment Freeze? A: The Senior Citizens Assessment Freeze Homestead Exemption requires annual application and has specific income and age requirements. Contact the Kendall County Supervisor of Assessments office for application forms and current income limits. This exemption freezes your assessed value at a prior year level, subject to qualification requirements and renewal procedures.

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