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Updated 2025 Tax Year

Clay County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Varies by location within county based on overlapping taxing districts (state average 2.27%)
Exemptions
5+ Available
Section 1

How Property Tax Works

Clay 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 assessed annually based on the property's equalized assessed value (EAV), which is typically one-third of the property's fair market value. The county follows Illinois state law requiring assessments to reflect 33.33% of fair market value.

The effective tax rate in Clay County varies significantly by location within the county due to different combinations of overlapping taxing districts. While the state average is approximately 2.27%, Clay County rates may differ based on which school district, municipality, township, and special districts serve your property. Property owners receive one annual tax bill with two installment payment options, and various tax credits are available to qualifying residents who submit proper applications.

Section 2

What Makes Up Your Tax Bill

Based on available 2022-2023 data (2025 rates pending):

ComponentRateDescription
County General0.0510%County operations and services
School DistrictsVariesElementary and high school districts (rates vary by district)
TownshipVariesTownship road maintenance and services
MunicipalityVariesCity/village services (if applicable)
Fire ProtectionVariesFire district services (where applicable)
Library DistrictVariesPublic library services (where applicable)
Total Composite RateVariableDepends on specific taxing district combinations

Note: These rates apply to the 2022-2023 levy year. Actual rates vary significantly by property location within Clay County based on which combination of taxing districts serve the property. Contact the Clay County Clerk for current rates specific to your address.

Section 3

When Are Property Taxes Due?

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

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 Illinois are typically triggered when property undergoes significant changes that affect its assessed value during the tax year. Common triggers include new construction, major improvements, or ownership transfers that reveal previously underassessed value. Clay County follows the state's equalization process, which may result in assessment adjustments.

When supplemental taxes are issued, they represent the difference between the original tax bill and what should have been billed based on the corrected assessment. For example, if a property's assessed value increases from $100,000 to $120,000 due to completed construction, the supplemental tax would be calculated on the additional $20,000 in assessed value, prorated for the portion of the tax year the improvement was completed.

Example Calculation

Example 1: $300,000 Market Value Property

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less Homeowner Exemption: -$10,000
  • Net Taxable Value: $90,000
  • Tax Rate (estimated): 2.5%
  • Annual Tax: $2,250
  • Monthly Escrow: $188

Example 2: $600,000 Market Value Property

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less Homeowner Exemption: -$10,000
  • Net Taxable Value: $190,000
  • Tax Rate (estimated): 2.5%
  • Annual Tax: $4,750
  • Monthly Escrow: $396

Example 3: $1,000,000 Market Value Property

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,333
  • Less Homeowner Exemption: -$10,000
  • Net Taxable Value: $323,333
  • Tax Rate (estimated): 2.5%
  • Annual Tax: $8,083
  • Monthly Escrow: $674

Note: Homeowner exemption requires application and applies only to primary residences. Additional credits may be available for seniors, veterans, or disabled persons with proper application.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Clay County require property tax escrow accounts to ensure timely payment of property taxes. Lenders typically collect 1/12 of the annual tax bill with each monthly mortgage payment, plus an additional cushion as allowed by federal law. The escrow account is analyzed annually, and adjustments are made based on actual tax bills and payment history.

Clay County issues tax bills once annually with two installment due dates (June 1 and August 1). Lenders typically pay from escrow when each installment becomes due. Property owners should verify that their lender receives tax bills directly from the county treasurer's office and makes payments on time to avoid penalties. If you pay taxes directly rather than through escrow, ensure you understand the specific due dates and payment options available through the Clay County Treasurer's office.

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 Clay County? A: Property taxes are due in two installments: June 1 and August 1. If the first bill is received late, the first payment is due 30 days after the bill date.

Q: What tax credits are available and do they require application? A: Illinois offers several tax credits that require application: Homeowner Exemption (reduces EAV by up to $10,000), Senior Citizens Homestead Exemption, Senior Citizens Assessment Freeze, Disabled Veterans Exemption, and Homestead Improvements Exemption. None are automatic - all require filing applications.

Q: How does the Homestead Exemption work? A: The Homestead Exemption reduces your property's equalized assessed value by up to $10,000 for your primary residence. This exemption requires application and must be renewed periodically. It does not reduce market value but reduces the taxable assessed value.

Q: When are properties reassessed? A: Clay County follows the Illinois assessment cycle. Contact the Supervisor of Assessments for specific reassessment schedules and procedures.

Q: What happens if I pay my taxes late? A: Late payments incur penalties and interest charges. Continued delinquency can result in tax sale proceedings after a two-year delinquent period.

Q: Can I pay property taxes online? A: Contact the Clay County Treasurer's office directly for current online payment options and accepted payment methods.

Q: How do special district taxes affect my bill? A: Your total tax rate depends on which combination of school districts, fire districts, library districts, and municipalities serve your property. Rates vary significantly across different areas of the county.

Q: How do I appeal my property assessment? A: Appeals follow a structured process: first to the local Board of Review, then potentially to the Illinois Property Tax Appeal Board (PTAB). Specific deadlines and procedures must be followed.

Q: What is the Property Tax Extension Limitation Law (PTELL)? A: PTELL limits the annual increase in property tax extensions for most taxing districts, providing some protection against dramatic tax increases.

Q: Where can I find my specific tax rate? A: Contact the Clay County Clerk's office with your property address to determine which specific taxing districts serve your property and the applicable composite tax rate.

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