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Updated 2025 Tax Year

Lee County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Approximately 2.9% effective rate, varies significantly by taxing districts and location within county
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Lee 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 government entities, with the county serving as the collection agent for all taxing districts within its boundaries.

The effective property tax rate in Lee County for the 2025 levy year is approximately 2.9%, though actual rates vary significantly by location within the county due to overlapping special taxing districts such as school districts, fire protection districts, and municipalities. Property owners should note that their specific tax rate depends on which combination of taxing districts their property falls within. The county operates under Illinois' Property Tax Extension Limitation Law (PTELL), which caps annual tax extension increases for most taxing bodies.

Section 2

What Makes Up Your Tax Bill

ComponentRate RangeDescription
County General0.3-0.5%County operations, health department, sheriff
School Districts1.5-2.2%Elementary and high school districts (varies by district)
Township0.1-0.3%Road maintenance, general assistance, assessor
Fire Protection0.2-0.4%Fire and emergency services (where applicable)
Municipal0.3-0.8%City/village services (incorporated areas only)
Library0.1-0.2%Public library services (where applicable)
Total Composite Rate~2.9%Average for FY 2025-2026 levy year

Note: These rates apply to the 2025 property tax levy (FY 2025-2026). Actual rates vary by specific taxing district combinations. The PTELL limiting rate for Lee County is 2.9% for the 2025 extensions.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Lee 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 Lee County are triggered by changes in property ownership, new construction, or significant 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 the supplemental tax owed.

Supplemental taxes are calculated based on the difference between the new assessed value and the previous assessed value, prorated for the portion of the tax year remaining after the change occurred. For example, if a $100,000 home improvement is completed in January and increases the assessed value by $33,333 (at 33.33% assessment ratio), the supplemental tax would be approximately $967 ($33,333 × 2.9% rate) for that tax year. Property owners typically receive supplemental tax bills within 60-90 days of the triggering event.

Example Calculation

Example 1: $300,000 Property

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less: Homeowner Exemption: -$10,000 (if applied for)
  • Net Taxable Value: $90,000
  • Annual Tax (2.9%): $2,610
  • Monthly Escrow: $218

Example 2: $600,000 Property

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less: Homeowner Exemption: -$10,000 (if applied for)
  • Net Taxable Value: $190,000
  • Annual Tax (2.9%): $5,510
  • Monthly Escrow: $459

Example 3: $1,000,000 Property

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,333
  • Less: Homeowner Exemption: -$10,000 (if applied for)
  • Net Taxable Value: $323,333
  • Annual Tax (2.9%): $9,377
  • Monthly Escrow: $781

Note: Homeowner exemption requires annual application and is not automatic. Rates shown are county average; actual rates vary by taxing district location.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Lee County require property tax escrow accounts, collecting monthly payments equal to 1/12 of the annual property tax bill plus insurance premiums. Lenders typically collect an additional 2-month cushion as allowed by federal law. Your lender will analyze your escrow account annually and adjust monthly payments based on actual tax bills received.

Lee County property taxes are due in two installments: the first installment is due June 13, 2026, and the second installment is due September 12, 2026 for the current tax year. Lenders usually pay the first installment from escrow in June and the second in September. Property owners should verify that their lender has received and paid their tax bills on time, as the property owner remains ultimately responsible for timely payment regardless of escrow arrangements.

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 Lee County for FY 2025-2026? A: First installment is due June 13, 2026, and second installment is due September 12, 2026. If bills are mailed after May 1, the first installment is due 30 days after the bill date.

Q: What tax credits are available and do they require application? A: The primary credit is the Homeowner Exemption (reduces assessed value by up to $10,000), which requires annual application. Senior Citizens Assessment Freeze, Disabled Persons exemption, and Veterans exemptions are also available but all require separate applications and eligibility verification.

Q: How does the Homestead exemption work? A: The Homeowner Exemption reduces your property's equalized assessed value by up to $10,000, not the market value. This exemption requires annual application and is not automatically applied. It must be filed with the Chief County Assessment Office.

Q: When are properties reassessed in Lee County? A: Illinois properties are reassessed annually. The county assessor reviews property values each year, with the Board of Review hearing appeals typically in summer months. Assessment notices are generally mailed in late spring.

Q: What are the penalties for late payment? A: Late payment penalties accrue monthly on unpaid balances. Interest and penalty rates are set by state law and compound monthly until paid in full.

Q: Can I pay property taxes online? A: Yes, Lee County offers online payment options through the County Collector's website. Credit card, debit card, and electronic check payments are typically accepted with associated processing fees.

Q: How do special district taxes work? A: Special districts (fire protection, library, park districts) overlap with county boundaries and add to your total tax rate. Your specific rate depends on which combination of districts serve your property location.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Lee County Board of Review during their annual appeal period, typically May through July. Appeals require evidence supporting your claim of incorrect valuation.

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