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Updated 2025 Tax Year

McDonough County
Property Tax Guide

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

9 Official Sources
8 min read
Quick Facts
Tax Rate
3.94% effective rate for 2024-25, varies by taxing districts (school, municipal, township, special districts)
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

McDonough County, Illinois operates under a property tax system that funds essential local services including schools, municipalities, townships, and special districts. Property taxes are the primary revenue source for local governments, supporting education, public safety, infrastructure, and community services throughout the county. The effective tax rate in McDonough County is projected to be approximately 3.94% for the 2024-25 fiscal year, though this represents a composite rate that can vary significantly based on your specific location.

Your actual property tax rate depends on which taxing districts serve your property, including school districts, municipalities, township services, and special districts like fire protection or library districts. This layered approach means that two properties of equal value in different parts of McDonough County may have different tax obligations. Illinois law requires that property taxes be based on assessed value rather than market value, with residential properties assessed at 33.33% of fair market value as determined by the County Supervisor of Assessments.

Section 2

What Makes Up Your Tax Bill

The following table shows the major components of property tax rates in McDonough County for fiscal year 2024-25:

ComponentApproximate RateDescription
Elementary/High School Districts2.50% - 3.00%Local school district operations and facilities
Transportation System0.44%School transportation services
Municipal Services0.30% - 0.80%City/village services (varies by municipality)
Township Services0.15% - 0.25%Township road maintenance and services
County Services0.40% - 0.60%County government operations
Working Cash Fund0.03%Emergency fund for local governments
Fire Prevention/Safety0.05%Fire protection and safety services
Special EducationVariableSpecial education services

Note: Rates shown are approximate and vary by specific taxing districts within McDonough County. The total composite rate of approximately 3.94% applies to the assessed value (typically 33.33% of market value for residential properties).

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in McDonough 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 McDonough County are additional property tax assessments that occur when there are changes to property ownership, improvements, or new construction after the regular assessment period. These supplemental bills are calculated based on the difference between the previous assessment and the new assessed value, prorated for the portion of the tax year remaining.

Common triggers for supplemental taxes include purchasing a newly constructed home, completing major renovations that increase property value, or when the County Assessor discovers previously unassessed improvements. The supplemental tax is calculated by applying the current tax rate to the difference in assessed value, then prorating it based on the number of months remaining in the fiscal year. For example, if you purchase a new $400,000 home in January and the previous assessed value was $0, you would owe supplemental taxes on the full assessed value ($400,000 × 33.33% = $133,320 assessed value) prorated for the remaining months of the fiscal year.

Example Calculation

Here are three property tax calculations for McDonough County using the projected 3.94% effective rate for fiscal year 2024-25:

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (33.33%): $100,000
  • Less General Homestead Exemption: -$6,000 (if applied for and approved)
  • Net Taxable Value: $94,000
  • Annual Tax ($94,000 × 3.94%): $3,704
  • Monthly Escrow Payment: $309

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value (33.33%): $200,000
  • Less General Homestead Exemption: -$6,000 (if applied for and approved)
  • Net Taxable Value: $194,000
  • Annual Tax ($194,000 × 3.94%): $7,644
  • Monthly Escrow Payment: $637

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (33.33%): $333,300
  • Less General Homestead Exemption: -$6,000 (if applied for and approved)
  • Net Taxable Value: $327,300
  • Annual Tax ($327,300 × 3.94%): $12,896
  • Monthly Escrow Payment: $1,075

Note: All exemptions require separate application and approval. Rates may vary based on specific taxing districts within the county.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in McDonough County require borrowers to maintain an escrow account for property tax payments, especially when the loan-to-value ratio exceeds 80%. Your lender will estimate your annual property tax obligation and divide it by 12 to determine your monthly escrow payment. The lender typically collects an additional 2-3 months as a cushion to ensure sufficient funds are available when taxes become due.

Property taxes in McDonough County are generally due in two installments, with payment dates that can vary but typically fall around June 1st and September 1st of each year. Your mortgage servicer will pay these bills directly from your escrow account when they become due. You should receive an annual escrow analysis statement showing how your payments were applied and any adjustments needed for the coming year. If your property taxes increase due to reassessment or rate changes, your monthly escrow payment will be adjusted accordingly, and you may need to pay any shortage over 12 months or in a lump sum, depending on your lender's policy.

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 McDonough County for the current fiscal year? A: Property taxes are typically due in two installments, generally around June 1st and September 1st, though exact dates may vary. Contact the McDonough County Collector's office for specific due dates for the current tax year.

Q: What tax credits are available and do I need to apply for them? A: The primary tax credit available is the General Homestead Exemption, which reduces your assessed value by up to $6,000. This credit is NOT automatic and requires a separate application to the McDonough County Supervisor of Assessments office. Applications must be filed annually or when you first become eligible.

Q: How does the Homestead Exemption work? A: The Homestead Exemption reduces your property's assessed value by up to $6,000, not your market value. For example, if your assessed value is $100,000, the exemption reduces it to $94,000 for tax calculation purposes. You must apply for this exemption - it is not automatically applied.

Q: Is there a senior citizen property tax credit available? A: Yes, the Low-Income Senior Citizens Assessment Freeze Homestead Exemption is available for qualified seniors. For 2026, the maximum income limit has increased to $75,000. This exemption "freezes" your home's assessed value at a base year level. Contact the McDonough County Supervisor of Assessments office for application requirements and deadlines.

Q: How often are properties reassessed in McDonough County? A: Illinois law requires properties to be reassessed at least every four years, though McDonough County may reassess more frequently. The County Supervisor of Assessments conducts these reassessments to ensure properties are assessed at fair market value.

Q: What should I do if I disagree with my property assessment? A: You can appeal your assessment by filing a complaint with the McDonough County Board of Review. Appeals must typically be filed within 30 days of receiving your assessment notice. Contact the Board of Review for specific deadlines and required forms.

Q: What are the penalties for late property tax payments? A: Late payments typically incur interest charges and penalties. The exact penalty structure and interest rates are set by Illinois state law and local ordinances. Contact the McDonough County Collector's office for current penalty rates and payment options.

Q: Can I pay my property taxes online? A: Many Illinois counties offer online payment options. Contact the McDonough County Collector's office or visit their website to determine available electronic payment methods, including any associated convenience fees.

Q: Why did my property taxes increase even though I didn't improve my property? A: Property taxes can increase due to several factors: changes in your property's assessed value due to market conditions, increases in tax rates by local taxing districts, new special assessments, or the addition of new taxing districts. Your tax bill should show the breakdown of these components.

Q: What special districts might affect my property tax bill? A: McDonough County properties may be subject to various special district taxes including transportation systems, fire prevention and safety districts, working cash funds, and special education districts. The specific districts affecting your property depend on your location within the county and are listed on your tax bill.

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