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Updated 2025 Tax Year

Calhoun County
Property Tax Guide

Everything you need to know about property taxes in Calhoun 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 taxing district location within county, base assessment at 33.33% of market value
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Calhoun County, Illinois operates under the Illinois property tax system, which funds essential local services including schools, county government, townships, and special districts. Property taxes in Calhoun County are assessed annually and collected to support these vital community services. The county follows Illinois state law requiring properties to be assessed at 33.33% of fair market value for residential properties.

The effective tax rate in Calhoun County varies significantly by location within the county due to different combinations of taxing districts. Based on 2025 assessment data, property owners can expect rates that differ depending on their specific school district, municipality, township, and any special taxing districts that serve their area. The county uses an equalization factor (1.0000 for 2025 taxes payable in 2026) to ensure uniform assessment practices across the county.

Property tax bills in Calhoun County follow Illinois's two-year assessment cycle, meaning your 2025 assessed value determines your 2026 tax liability. All property tax credits and exemptions require separate applications and are not automatically applied to your assessment.

Section 2

What Makes Up Your Tax Bill

ComponentEstimated Rate RangeDescription
County General Fund0.200% - 0.400%Basic county operations and services
School Districts3.500% - 5.500%Local elementary and high school districts
Township0.100% - 0.300%Township road maintenance and services
Community College0.250% - 0.400%Regional community college district
Fire Protection0.150% - 0.500%Fire protection districts (where applicable)
Library District0.100% - 0.250%Public library services (where applicable)
Total Composite Rate4.300% - 7.350%Varies by specific location and districts

Rates shown are for FY 2025-2026 levy year and represent estimates. Actual rates vary significantly based on your property's location within specific taxing districts. Contact the Calhoun County Clerk for your exact composite tax rate.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Calhoun 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 Calhoun County are additional property tax assessments that occur when there are significant changes to a property after the annual assessment date. The most common triggers include new construction, major improvements, or changes in property ownership that reveal previously unreported improvements.

When supplemental taxes are assessed, they are calculated based on the difference between the old assessed value and the new assessed value, multiplied by the applicable tax rate for the remaining portion of the tax year. For example, if you complete a $100,000 home addition in March, and the addition increases your assessed value by $33,330 (at the 33.33% assessment ratio), you would owe supplemental taxes on this increased value for the remaining months of that tax year.

Supplemental tax bills are issued separately from regular property tax bills and typically have their own due dates. Property owners receive notice of supplemental assessments and have the right to appeal these additional assessments through the same process as regular property tax appeals.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less: Homeowner Exemption: $10,000 (if applied for)
  • Net Taxable Value: $90,000
  • Tax Rate (estimated): 5.5%
  • Annual Tax: $4,950
  • Monthly Escrow: $412.50

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less: Homeowner Exemption: $10,000 (if applied for)
  • Net Taxable Value: $190,000
  • Tax Rate (estimated): 5.8%
  • Annual Tax: $11,020
  • Monthly Escrow: $918.33

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,300
  • Less: Homeowner Exemption: $10,000 (if applied for)
  • Net Taxable Value: $323,300
  • Tax Rate (estimated): 6.2%
  • Annual Tax: $20,045
  • Monthly Escrow: $1,670.42

All exemptions require separate application and are not automatically applied. Tax rates vary by specific taxing districts.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Calhoun County require borrowers to maintain an escrow account for property tax payments. The lender collects monthly payments equal to 1/12th of your estimated annual property tax bill and holds these funds in a separate account. When property taxes become due (June 15 and September 15), the lender pays the taxes directly to the county on your behalf.

Lenders typically conduct annual escrow analyses to ensure adequate funds are being collected. If property taxes increase, your monthly escrow payment may increase accordingly. Illinois law requires lenders to provide advance notice of escrow payment changes. Property owners should verify that their lender has paid property taxes on time, as the property owner remains ultimately responsible for payment even when using escrow services.

If you pay property taxes directly without escrow, remember that Calhoun County property taxes are due June 15 (first installment) and September 15 (second installment) for the 2026 tax year. Late payments incur penalties and interest charges that compound monthly.

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 Calhoun County for the current tax year? A: For 2025 taxes (payable in 2026), the first installment is due June 15, 2026, and the second installment is due September 15, 2026.

Q: What property tax credits are available and how do I apply? A: The Homeowner Exemption reduces your assessed value by up to $10,000 and must be applied for annually. Senior citizens age 65+ may qualify for an additional Senior Citizen Homestead Exemption reducing assessed value by $5,000. Both require separate applications filed with the County Clerk.

Q: How does the Homestead Exemption work? A: The Homestead Exemption is actually a credit that reduces your property's assessed value by up to $10,000, not your market value. You must apply for this credit annually - it is not automatic. Contact the Calhoun County Clerk's office for application forms and deadlines.

Q: What happens if I pay my property taxes late? A: Late payments incur penalties and interest. Interest accrues monthly on unpaid balances, and properties with significantly delinquent taxes may eventually face tax sale proceedings.

Q: How often are properties reassessed in Calhoun County? A: Illinois follows a quadrennial (4-year) general reassessment cycle, though the County Assessor may update individual property assessments annually based on sales data, improvements, or other factors.

Q: Can I appeal my property assessment? A: Yes, you can appeal your assessment to the Calhoun County Board of Review if you believe your property is overassessed. Appeals must be filed within specific deadlines after assessment notices are mailed.

Q: Are there online payment options available? A: Contact the Calhoun County Treasurer's office directly for current online payment options and accepted payment methods for property taxes.

Q: Why do property tax rates vary within Calhoun County? A: Tax rates vary based on the combination of taxing districts that serve your property, including different school districts, municipalities, townships, fire protection districts, and library districts. Each district sets its own levy rate.

Q: What is the equalization factor and how does it affect my taxes? A: The equalization factor (1.0000 for 2025 taxes) is applied by the state to ensure uniform assessment practices across counties. When the factor is 1.0000, it has no effect on your assessed value.

Q: Do I need to reapply for exemptions every year? A: Most exemptions and credits require annual application or renewal. Contact the Calhoun County Clerk's office to verify renewal requirements for your specific exemptions.

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