HonestCasa logoHonestCasa
Updated 2025 Tax Year

Franklin County
Property Tax Guide

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

9 Official Sources
8 min read
Quick Facts
Tax Rate
Approximately 4.175% effective rate (varies significantly by taxing district combination)
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Franklin County, Illinois operates under the state's property tax system to fund essential local services including schools, county government operations, townships, and various special districts. Property taxes are the primary revenue source for local governments, supporting public safety, education, infrastructure maintenance, and community services throughout the county.

The effective tax rate in Franklin County varies significantly by location within the county due to different combinations of taxing districts. While the most recent available county-wide rate was approximately 4.175% in 2021, individual properties may experience higher or lower rates depending on their specific school district, municipality, township, and any special service districts that apply to their location. Illinois uses an equalized assessed value (EAV) system where properties are typically assessed at 33.33% of fair market value, and various tax credits and exemptions may be available to qualifying property owners, though most require annual application.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate RateDescription
County General0.45% - 0.65%County operations, courts, public safety
School Districts2.8% - 3.5%Varies by school district boundaries
Township0.15% - 0.25%Township services and roads
Community College0.25% - 0.35%Southeastern Illinois College district
Municipality0.3% - 0.8%City/village services (if applicable)
Special Districts0.1% - 0.4%Fire protection, library, park districts

Note: These rates are estimates based on 2021 levy year data. Actual rates for the current tax year vary significantly by specific location within Franklin County due to overlapping taxing district boundaries. Contact the Franklin County Clerk's office for precise current rates applicable to your property's tax code area.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Franklin 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 property taxes in Franklin County are additional assessments that occur when there are changes to a property's assessed value outside the regular assessment cycle. The most common triggers include new construction or improvements completed after the January 1 assessment date, ownership transfers that prompt reassessment, or corrections to the original assessment.

When supplemental taxes are levied, they are calculated by applying the current tax rate to the difference between the new assessed value and the previous assessed value, prorated for the portion of the tax year remaining. For example, if a property improvement increases the assessed value by $30,000 and is completed in March, the supplemental tax would be calculated on that $30,000 increase for the remaining 10 months of the tax year. Property owners typically receive a separate supplemental tax bill with its own due date, usually 30 days from the bill date.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Homeowner Exemption: -$10,000
  • Net Taxable EAV: $90,000
  • Tax Rate (estimated): 4.175%
  • Annual Tax: $3,758
  • Monthly Escrow: $313

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Homeowner Exemption: -$10,000
  • Senior Citizen Homestead Credit: -$5,000 (if applicable)
  • Net Taxable EAV: $185,000
  • Tax Rate (estimated): 4.175%
  • Annual Tax: $7,724
  • Monthly Escrow: $644

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,333
  • Homeowner Exemption: -$10,000
  • Net Taxable EAV: $323,333
  • Tax Rate (estimated): 4.175%
  • Annual Tax: $13,499
  • Monthly Escrow: $1,125

Note: Tax credits shown require annual application and approval. Actual rates vary by tax code area within Franklin County.

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders in Franklin County require property tax escrow accounts for borrowers with loans exceeding 80% loan-to-value ratio. The lender collects monthly payments equal to 1/12th of the annual property tax bill along with your mortgage payment. These funds are held in a non-interest-bearing escrow account and used to pay your property taxes when they become due.

Lenders typically conduct annual escrow analyses to ensure adequate funds are collected, comparing the previous year's actual tax bills with the estimated amounts collected. If taxes increase significantly, you may face an escrow shortage requiring either a lump sum payment or increased monthly payments. Franklin County property taxes are generally due on June 1st for the first installment and October 20th for the second installment, and lenders usually pay these bills directly to the county collector. Property owners should verify that payments are made timely and retain copies of all tax bills and payment confirmations for their records.

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 Franklin County for the current tax year? A: Property taxes are typically due June 1st for the first installment and October 20th for the second installment. Due dates may vary slightly year to year, so check your actual tax bill for specific dates.

Q: What homeowner tax credits are available and do I need to apply? A: The primary homeowner exemption reduces your equalized assessed value by up to $10,000 and requires annual application by January 1st. Senior citizens may qualify for additional homestead credits that cap assessment increases. All credits require application - none are automatic.

Q: How does the Homestead Exemption work? A: The Homestead Exemption is actually a credit that reduces your property's equalized assessed value by up to $10,000, not your market value. You must apply annually by January 1st with the county assessor, and it only applies to your primary residence.

Q: How often are properties reassessed in Franklin County? A: Illinois law requires counties to reassess properties every four years. Franklin County follows this quadrennial assessment cycle, with properties reassessed based on market conditions and sales data.

Q: What happens if I pay my property taxes late? A: Late payments incur penalties and interest charges. The first installment penalty begins after June 1st, and the second installment penalty begins after October 20th. Interest typically accrues at 1.5% per month on unpaid balances.

Q: Can I pay my property taxes online? A: Yes, Franklin County typically offers online payment options through the county treasurer's website. Credit card payments may incur additional processing fees.

Q: How do special district taxes affect my bill? A: Special districts like fire protection, library, or park districts add separate line items to your tax bill. These rates vary significantly by location within the county based on which districts serve your property.

Q: How can I appeal my property assessment? A: Assessment appeals must be filed with the Franklin County Board of Review during their designated appeal period, typically late summer through early fall. You'll need evidence supporting your claim that the assessed value exceeds fair market value.

Q: What documentation do I need for tax credit applications? A: For homeowner exemptions, you typically need proof of ownership and residence. Senior citizen credits may require age verification and income documentation. Contact the Franklin County Assessor's office for specific application requirements and deadlines.

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Free • No credit check • 2-minute estimate