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Updated 2025 Tax Year

Will County
Property Tax Guide

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

10 Official Sources
8 min read
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Quick Facts
Tax Rate
6% to 10%+ (varies by district, e.g., New Lenox 8.78%)
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Will County property taxes fund essential local services including public schools, municipalities, townships, fire protection districts, and other special districts. The property tax system in Will County operates under Illinois state law, including the Property Tax Extension Limitation Law (PTELL), which limits annual tax increases for most taxing bodies to the lesser of 5% or the Consumer Price Index increase.

Property tax rates in Will County vary significantly by location due to different combinations of taxing districts. For example, New Lenox shows a tax rate of 8.7797% for 2024, while rates across the county typically range from approximately 6% to over 10% depending on the specific taxing districts that serve each property. These rates are applied to the Equalized Assessed Value (EAV) of properties, which is determined by the Will County Supervisor of Assessments and equalized by the Illinois Department of Revenue.

Section 2

What Makes Up Your Tax Bill

ComponentTypical Rate RangeDescription
School Districts4.0% - 6.5%Elementary and high school districts, community colleges
Municipalities0.5% - 1.5%City or village services, infrastructure, police
Township0.1% - 0.3%Township government services and road maintenance
County0.3% - 0.6%Will County government operations
Fire Protection0.3% - 0.8%Fire and emergency services districts
Park Districts0.1% - 0.4%Local parks and recreation services
Library Districts0.2% - 0.5%Public library services
Special Districts0.1% - 0.3%Sanitary, forest preserve, and other special services

Note: Actual rates vary by location within Will County based on which taxing districts serve each property.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Will 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 taxes in Will County are triggered by changes in property ownership, new construction, or significant property improvements that increase assessed value during the tax year. When these events occur, the county assessor determines the additional assessed value and applies the current tax rate to calculate supplemental taxes owed for the remaining portion of the tax year.

For example, if a homeowner completes a $100,000 addition in July, increasing their assessed value by $33,333 (at Illinois' one-third assessment ratio), and their tax rate is 8.78%, they would owe approximately $1,464 in supplemental taxes for the remaining six months of the tax year ($33,333 × 8.78% × 0.5 years). Supplemental tax bills are issued separately from regular tax bills and have their own payment due dates, typically 30 days from the bill date.

Example Calculation

$300,000 Home

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less Homeowner Exemption: -$8,000
  • Net Taxable EAV: $92,000
  • Tax Rate (example): 8.78%
  • Annual Tax: $8,078
  • Monthly Escrow: $673

$600,000 Home

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less Homeowner Exemption: -$8,000
  • Net Taxable EAV: $192,000
  • Tax Rate (example): 8.78%
  • Annual Tax: $16,858
  • Monthly Escrow: $1,405

$1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,333
  • Less Homeowner Exemption: -$8,000
  • Net Taxable EAV: $325,333
  • Tax Rate (example): 8.78%
  • Annual Tax: $28,564
  • Monthly Escrow: $2,380

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Will County require borrowers to maintain an escrow account for property tax payments. Lenders collect monthly escrow payments as part of your mortgage payment and hold these funds to pay property taxes when due. The lender typically collects one-twelfth of your annual property tax bill each month, plus a cushion amount (usually 1-2 months) to ensure adequate funds.

Property tax bills in Will County are mailed starting May 1st each year, with payment due dates typically falling on June 3rd for the first installment and September 2nd for the second installment. Lenders receive tax bills directly and make payments on behalf of homeowners. Property owners should verify that their lender has the correct mailing address with the Will County Treasurer's office and review their annual escrow analysis to ensure proper funding levels throughout the year.

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 Will County property taxes due? A: Property taxes are paid in two installments. For 2025, the first installment is due June 3rd and the second installment is due September 2nd. Tax bills are mailed starting May 1st.

Q: What is the homeowner exemption and how do I apply? A: Will County offers a homeowner exemption that reduces your property's Equalized Assessed Value by $8,000, following the Illinois Property Tax Code. You must apply with the Will County Supervisor of Assessments.

Q: How often are properties reassessed in Will County? A: Illinois law requires properties to be reassessed every four years, though the county may conduct interim reassessments for properties that have changed significantly.

Q: Can I pay my property taxes online? A: Yes, but the online payment system is seasonal. It typically opens on May 1st when tax bills are mailed and closes after the September payment deadline. The system reopens the following May.

Q: What happens if I pay my property taxes late? A: Late payments incur penalties and interest charges. The exact penalty structure is set by Illinois state law and begins accruing immediately after the due date.

Q: How do I appeal my property assessment? A: Assessment appeals in Will County must be filed with the Will County Board of Review within 30 days of receiving your assessment notice, typically by July 31st each year.

Q: What if I disagree with my tax bill amount? A: If you believe there's an error in your tax bill calculation, contact the Will County Treasurer's office immediately. For assessment disputes, you must file during the designated appeal period.

Q: Are senior citizens eligible for additional exemptions? A: Yes, Will County offers various exemptions for seniors, veterans, and disabled persons. Contact the Will County Supervisor of Assessments office for a complete listing of available exemptions and qualification requirements.

Q: How are tax rates determined each year? A: Tax rates are calculated by dividing each taxing body's approved levy by the total Equalized Assessed Value in their district. The 2025 tax rates will not be available until after May 1, 2026.

Q: What is C-PACE financing mentioned on tax bills? A: C-PACE (Commercial Property Assessed Clean Energy) is a financing mechanism for energy efficiency improvements that allows repayment through property tax bills on a semi-annual basis.

Verified Sources

Backed by 10 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
Multi-Year Inquirywilltax.willcounty.gov
02
State
INQUIRE REAL ESTATE TAX INFOwilltax.willcounty.gov
03
Tax Doc
Tax Rates, Values & Extensionswillcountyclerk.gov
04
County
Will County Illinois > County Offices > Finance and ...willcounty.gov
05
Tax Doc
Finance and Revenue - Treasurer Office - Tax Levy Calendarwillcounty.gov
06
Tax Doc
tax sale redemptionwillcountyclerk.gov
07
General Homestead Exemptionlakecountyil.gov
08
County
Will County Illinois > County Offices > Finance and ...willcounty.gov
09
Tax Doc
Property Tax - Exemption Information (PIO-74)tax.illinois.gov
10
WC Finance Departmentwillcounty.gov
All sources verified as of 2025 Tax Year

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