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Updated 2025 Tax Year

Hamilton County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
9.00% effective rate, varies significantly by taxing district location
Exemptions
4+ Available
Section 1

How Property Tax Works

Hamilton County, Illinois operates under a property tax system that funds essential local services including schools, county government, townships, and various special districts. Property taxes are the primary revenue source for these local governments, supporting everything from education and public safety to road maintenance and library services. The county follows Illinois state law requiring properties to be assessed at 33.33% of fair market value, with the Hamilton County Supervisor of Assessments conducting valuations based on sales data from the three most recent years.

The effective property tax rate in Hamilton County for the 2025 tax year is approximately 9.00%, though this rate varies significantly depending on your property's location within specific taxing districts. Properties located within different school districts, municipalities, townships, fire protection districts, and other special taxing bodies will have different combined tax rates. The actual tax rate applied to your property depends on the combination of all taxing districts that serve your specific location within Hamilton County.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate RateDescription
County General0.75%Hamilton County operations, courthouse, sheriff
Schools5.50%Elementary and high school districts (varies by district)
Township0.35%Township road maintenance, general assistance
Community College0.40%Southeastern Illinois College district
Fire Protection0.45%Rural fire protection districts (if applicable)
Library0.25%Public library districts
Cemetery0.10%Cemetery maintenance districts
Other Districts1.20%Drainage, park, municipal services (varies)
Total Estimated9.00%Combined rate for Tax Year 2025

Note: These rates are estimates for Levy Year 2025 and vary significantly by location within Hamilton County. Your actual tax rate depends on which combination of taxing districts serve your property. Contact the Hamilton County Clerk for your specific district combination and exact rates.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Hamilton 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 Hamilton County are triggered by changes in property ownership, new construction, or improvements that increase a property's assessed value during the tax year. When you purchase property or complete construction after January 1st (the assessment date), a supplemental tax may be issued to account for the difference between the previous assessment and the new assessed value.

The supplemental tax is calculated by determining the difference between the old and new assessed values, applying the current tax rate to that difference, and prorating it for the remaining months in the tax year. For example, if you purchase a home in July that was previously assessed at $150,000 but now reflects a market value requiring a $200,000 assessment, you would owe supplemental taxes on the additional $50,000 in assessed value (at 33.33% assessment ratio = $16,665 additional assessed value) for the remaining 6 months of that tax year.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less: General Homestead Exemption: -$10,000 (requires application)
  • Net Taxable Assessed Value: $90,000
  • Annual Tax (9.00% rate): $8,100
  • Monthly Escrow: $675

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less: General Homestead Exemption: -$10,000 (requires application)
  • Net Taxable Assessed Value: $190,000
  • Annual Tax (9.00% rate): $17,100
  • Monthly Escrow: $1,425

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,300
  • Less: General Homestead Exemption: -$10,000 (requires application)
  • Net Taxable Assessed Value: $323,300
  • Annual Tax (9.00% rate): $29,097
  • Monthly Escrow: $2,425

Note: All exemptions require annual application and are not automatically applied. Tax rates vary by specific taxing districts within Hamilton County.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Hamilton County require property tax escrow accounts for borrowers with less than 20% down payment. Your lender collects monthly escrow payments along with your mortgage payment, typically 1/12th of your estimated annual property tax bill. The lender holds these funds in a separate account and pays your property taxes directly to Hamilton County when they become due.

Hamilton County property taxes are paid in two installments: the first half is due by March 20th and the second half by September 20th. Your mortgage servicer will receive tax bills directly from the county and make payments on your behalf. You should receive an annual escrow statement from your lender showing the payments made and any adjustments to your monthly escrow amount based on actual tax bills versus estimates. If your taxes increase significantly due to reassessment or rate changes, your lender may require an escrow shortage payment or increase your monthly payment to cover the higher amount.

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 Hamilton County? A: Property taxes for Tax Year 2025 are due in two installments: first half by March 20, 2026, and second half by September 20, 2026.

Q: What tax credits are available and do I need to apply? A: The primary credit is the General Homestead Exemption, which reduces your assessed value by up to $10,000. This requires annual application using form PTAX-214. Senior citizens and disabled persons may qualify for additional credits, but all require separate applications with specific deadlines.

Q: How does the Homestead Exemption work? A: The General Homestead Exemption reduces your property's Equalized Assessed Value (EAV) by up to $10,000, not your market value. You must file Form PTAX-214 annually, and this credit is NOT automatic. It also includes a provision that can limit assessment increases to help provide stability for homeowners.

Q: How often are properties reassessed in Hamilton County? A: Hamilton County conducts assessments annually, with the Hamilton County Supervisor of Assessments reviewing property values based on recent sales data. The 2025 assessments were based on sales from 2022, 2023, and 2024.

Q: What happens if I pay my property taxes late? A: Late payments incur penalties and interest charges in addition to the tax amount due. Interest begins accruing immediately after the due date, and additional penalties may apply for extended delinquency.

Q: Can I pay my property taxes online? A: Contact the Hamilton County Treasurer's office for current online payment options and accepted payment methods. Payment options and websites may vary.

Q: How do I appeal my property assessment? A: You can appeal your assessment to the Hamilton County Board of Review. Appeals typically must be filed by specific deadlines after assessment notices are mailed. Contact the Hamilton County Supervisor of Assessments for appeal forms and deadlines.

Q: Why do properties in the same county have different tax rates? A: Tax rates vary based on the combination of taxing districts that serve each property. Different school districts, fire protection districts, municipalities, and other special districts create different total tax rates even within Hamilton County.

Q: What is the Property Tax Extension Limitation Law (PTELL)? A: PTELL limits the annual increase in property tax extensions (total taxes collected) for most taxing districts to the lesser of 5% or the Consumer Price Index. This helps control overall tax growth at the district level.

Q: Do I need to reapply for exemptions every year? A: Yes, most property tax exemptions and credits, including the General Homestead Exemption, require annual application. The deadline is typically in early January, but contact the Hamilton County Supervisor of Assessments for specific dates and requirements.

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