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Updated 2025 Tax Year

Piatt County
Property Tax Guide

Everything you need to know about property taxes in Piatt 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
Varies by taxing district combination within county, average ranges 1.8-3.2%
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Piatt County, Illinois operates under the state's property tax system, which funds essential local services including schools, law enforcement, fire protection, libraries, and county operations. Property taxes are assessed annually based on the equalized assessed value (EAV) of real property, with the county maintaining an equalization factor of 1.0000 for 2025 taxes. The Illinois Property Tax Extension Limitation Law (PTELL) governs how tax levies can increase from year to year.

Property tax rates in Piatt County vary significantly by location within the county due to different combinations of taxing districts including school districts, municipalities, townships, library districts, and other special service areas. While Illinois has a statewide average effective tax rate of approximately 2.27%, your actual rate in Piatt County depends on which specific taxing districts serve your property. The county's rural nature means many properties are served by different school districts and township combinations, creating varying tax burdens across the county.

Section 2

What Makes Up Your Tax Bill

The 2025 property tax rates for Piatt County have not yet been finalized, as rates are determined closer to the tax year based on approved budgets from each taxing district. However, typical components include:

ComponentEstimated Rate RangeDescription
County General0.3% - 0.5%County operations, sheriff, courts, health services
School Districts1.2% - 1.8%Elementary and high school districts (varies by district)
Township0.1% - 0.3%Township road maintenance, general assistance
Municipality0.2% - 0.8%City services (if within city limits)
Library District0.1% - 0.2%Public library services
Other Special Districts0.1% - 0.4%Fire protection, park districts, drainage districts

Total Combined Rate: Varies by location within Piatt County

Note: These rates apply to the 2025 tax year (payable in 2025). Your actual rate depends on which specific combination of taxing districts serves your property address.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Piatt 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 Piatt County are additional property tax assessments that occur when there are changes to property ownership, new construction, or improvements that increase a property's assessed value during the tax year. These taxes are calculated based on the difference between the old and new assessed values, multiplied by the applicable tax rate for the remaining portion of the tax year.

Common triggers for supplemental taxes include: completion of new construction or major renovations, changes in property use or zoning, correction of assessment errors, or removal of exemptions. For example, if you complete a $50,000 home addition in August that increases your assessed value by $16,667 (at the standard 33.33% assessment ratio), and your combined tax rate is 2.5%, you would owe a supplemental tax of approximately $139 for the remaining four months of that tax year ($16,667 × 0.025 × 4/12 months).

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 Value: $90,000
  • Annual Tax (at 2.5% rate): $2,250
  • Monthly Escrow: $187.50

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 Value: $190,000
  • Annual Tax (at 2.5% rate): $4,750
  • Monthly Escrow: $395.83

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,333
  • Less: General Homestead Exemption: -$10,000 (requires application)
  • Net Taxable Value: $323,333
  • Annual Tax (at 2.5% rate): $8,083
  • Monthly Escrow: $673.58

Note: Tax credits require annual application and are not automatically applied. Rates shown are estimates and vary by specific taxing district combination.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Piatt County require borrowers to maintain an escrow account for property taxes, especially when the loan-to-value ratio exceeds 80%. Your lender will estimate your annual property tax bill and divide it by 12 to determine your monthly escrow payment, which is collected along with your principal and interest payment. Lenders typically maintain a cushion of 1-2 months of payments in the account to ensure adequate funds are available.

Property tax bills in Piatt County are released on May 15th each year and are due by November 15th. Your lender will receive the tax bill and pay it directly from your escrow account before the due date. The lender is required to provide you with an annual escrow analysis showing how your funds were used and any adjustments needed for the coming year. If your taxes increase significantly due to reassessment or rate changes, your monthly escrow payment may be adjusted accordingly. You should verify that your lender has current contact information and review your escrow statements to ensure taxes are being paid properly and on time.

How HonestCasa Helps
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Section 6

Frequently Asked Questions

Q: When are property taxes due in Piatt County for 2025? A: Property tax bills are released May 15, 2025, and taxes are due by November 15, 2025, for the 2025 tax year.

Q: What tax credits are available and do I need to apply? A: The General Homestead Exemption reduces assessed value by up to $10,000 and requires an application to the Supervisor of Assessments. The Homestead Exemption for Persons with Disabilities provides a $2,000 reduction in equalized assessed value and also requires application. These are NOT automatic - you must apply annually.

Q: How does the Homestead credit work? A: The General Homestead Exemption caps assessment increases rather than reducing market value. It limits how much your assessed value can increase year-over-year, providing tax stability. You must file an application with the Piatt County Supervisor of Assessments to receive this benefit.

Q: How often are properties reassessed in Piatt County? A: Illinois law requires properties to be assessed annually, though not all properties receive physical inspections each year. The county uses statistical analysis and market data to adjust assessments between physical inspections.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Piatt County Board of Review during their hearing period, typically in late summer. Contact the Supervisor of Assessments at (217) 762-4866 for specific deadlines and procedures.

Q: What are the penalties for late property tax payments? A: Illinois law imposes penalties and interest on delinquent property taxes. The specific rate and penalties should be confirmed with the Piatt County Treasurer's office.

Q: Can I pay my property taxes online? A: Yes, Piatt County accepts online property tax payments. You can also pay by mail to Piatt County Treasurer, PO Box 116, Monticello, IL 61856, or in person at the Treasurer's office.

Q: Why do tax rates vary within Piatt County? A: Different areas of the county are served by different combinations of school districts, municipalities, townships, and special districts. Each taxing body sets its own levy, creating different total tax rates depending on your property's location.

Q: Where do I apply for tax credits and exemptions? A: Applications for homestead exemptions and other credits are filed with the Piatt County Supervisor of Assessments, located at 101 W. Washington, Room 102, Monticello, IL 61856.

Q: What happens if I don't receive my tax bill? A: Contact the Piatt County Treasurer's office immediately at (217) 762-4866. You are still responsible for paying taxes on time even if you don't receive a bill.

Verified Sources

Backed by 10 Official Government Sources

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

01
County
Piatt County, Illinoispiatt.gov
02
Tax Doc
Tax Computation Reportiroquoiscountyil.gov
03
Tax Doc
PTAX-340 2025 Low-Income Senior Citizens Assessment ...piatt.gov
04
State
Online Real Estate Tax Paymentspiatt.gov
05
County
Piatt County, Illinoispiatt.gov
06
ASSESSED VALUES FOR 2024 TOWNSHIP FARMLANDpiatt.gov
07
General Homestead Exemptionpiatt.gov
08
Tax Doc
PTAX-343 Application for the Homestead Exemptionpiatt.gov
09
Tax Doc
PTAX-324 Application for Senior Citizens Homestead ...piatt.gov
10
2020-2021 Treasurer's Annual Report.xlsxpiatt.gov
All sources verified as of 2025 Tax Year

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