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Updated 2025 Tax Year

McHenry County
Property Tax Guide

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

8 Official Sources
8 min read
Quick Facts
Tax Rate
2.0% to 3.5% of market value, varies by taxing districts and location within county
1st Due
Jun 1
2nd Due
Sep 1
Exemptions
5+ Available
Section 1

How Property Tax Works

McHenry County property taxes fund essential local services including public schools, municipal services, townships, libraries, parks, and fire protection districts. Property taxes are calculated by applying local tax rates to your property's assessed value, which is determined at 33.33% of fair market value as mandated by Illinois law. The effective tax rate in McHenry County typically ranges from 2.0% to 3.5% of market value, though this varies significantly based on your specific location within the county.

Your actual tax rate depends on which special taxing districts serve your property, including school districts, municipalities, townships, library districts, and park districts. Each district sets its own levy rate, and the combination of all applicable districts determines your total property tax bill. Properties in different areas of McHenry County can have substantially different tax rates even with similar assessed values due to these varying district combinations.

Section 2

What Makes Up Your Tax Bill

ComponentTypical Rate RangeDescription
School Districts4.5% - 6.5%Elementary, high school, and community college districts
Municipal/Township0.8% - 1.5%City/village services or township government
County0.3% - 0.5%McHenry County general fund and services
Library District0.2% - 0.4%Public library operations
Park District0.2% - 0.6%Parks and recreation facilities
Fire Protection0.3% - 0.8%Fire and emergency services
Other Special Districts0.1% - 0.5%Conservation, sanitary, mosquito abatement

Rates shown are applied to Equalized Assessed Value (EAV) for levy year 2024-2025. Your specific rate depends on which districts serve your property location. Contact the McHenry County Clerk's office at (815) 334-4242 for your exact district combination and current rates.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in McHenry 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 McHenry County occur when property ownership changes or when new construction/improvements are completed after the January 1st assessment date. When you purchase a property, a supplemental bill covers the difference between what the previous owner paid and what you owe based on the current assessed value. For new construction, supplemental taxes are calculated on the added value from the completion date through the end of the tax year.

The supplemental amount is calculated by taking the difference between the old and new assessed values, multiplying by the applicable tax rate, and prorating for the portion of the tax year you own the property. For example, if you purchase a home in July that triggers a $2,000 annual tax increase, your supplemental bill would be approximately $1,000 to cover July through March of the 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 EAV: $90,000
  • Tax Rate (example district): 2.8%
  • Annual Tax: $2,520
  • Monthly Escrow: $210

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 EAV: $190,000
  • Tax Rate (example district): 3.2%
  • Annual Tax: $6,080
  • Monthly Escrow: $507

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 EAV: $323,300
  • Tax Rate (example district): 3.5%
  • Annual Tax: $11,316
  • Monthly Escrow: $943

Note: All tax credits require annual application and are not automatically applied. Rates vary by specific taxing districts.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in McHenry County require property tax escrow accounts to ensure timely payment of property taxes. Your lender collects 1/12th of your estimated annual property tax bill with each monthly mortgage payment and holds these funds in an escrow account. McHenry County property taxes are typically due in two installments: the first installment around June 1st and the second around September 1st (dates may vary by taxing district).

Your lender pays these bills directly to McHenry County when due. Each year, your lender will provide an escrow analysis statement showing your account activity and any adjustments needed for the coming year. If property taxes increase due to reassessment or rate changes, your monthly escrow payment will be adjusted accordingly. You can verify your tax payments and view payment history through the McHenry County Treasurer's website or by contacting their office at (815) 334-4110.

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 McHenry County for fiscal year 2024-2025? A: Property taxes are typically due in two installments - first installment around June 1st and second installment around September 1st. Exact dates vary by taxing district, so check your tax bill or the County Treasurer's website for specific due dates.

Q: What tax credits are available and how do I apply? A: The primary credit is the General Homestead Exemption, which reduces your Equalized Assessed Value by up to $10,000. This requires annual application through the McHenry County Assessor's office. Senior citizens may qualify for the Senior Citizen Homestead Exemption and Senior Assessment Freeze. Veterans may qualify for various veteran exemptions. All credits require separate applications - none are automatic.

Q: How does the Homestead Exemption work? A: The General Homestead Exemption limits annual assessment increases to protect homeowners from sudden tax spikes due to rising property values. It does not reduce your market value but caps how much your assessment can increase year-over-year. You must file an application with the Assessor's office, and the exemption applies to your primary residence only.

Q: When are properties reassessed in McHenry County? A: McHenry County conducts property reassessments every four years, with the most recent countywide reassessment completed in 2023. However, the Assessor may adjust individual property values between reassessment years due to improvements, appeals, or market changes.

Q: How can I appeal my property assessment? A: You can file an assessment complaint with the McHenry County Board of Review if you believe your property is overassessed. Applications are typically accepted from late spring through summer following the tax year. If unsatisfied with the Board of Review decision, you may appeal to the Illinois Property Tax Appeal Board (PTAB).

Q: What are the penalties for late payment? A: Late payments incur interest charges and penalties. The first installment penalty is typically 1.5% per month, while second installment penalties may be higher. After sufficient delinquency, properties may be subject to tax sale proceedings.

Q: Can I pay my property taxes online? A: Yes, McHenry County offers online payment options through their official website. You can pay by electronic check or credit card, though credit card payments may incur processing fees. Visit the McHenry County Treasurer's website or call (815) 334-4110 for payment options.

Q: Why do property taxes vary within McHenry County? A: Tax rates vary because different areas are served by different combinations of taxing districts. Your total rate includes school districts, municipality or township, library district, park district, fire protection district, and other special districts. Each sets its own levy rate, creating different total rates across the county.

Q: What happens if I disagree with a supplemental tax bill? A: You can contest supplemental taxes through the same appeal process as regular assessments. File a complaint with the McHenry County Board of Review within the specified timeframe. Contact the Assessor's office at (815) 334-4818 to discuss your concerns before filing a formal appeal.

Q: Are exemption applications due annually? A: Most property tax exemptions and credits in McHenry County require annual renewal applications. The exception is certain disability or veteran exemptions that may have longer terms. Exemption forms for the following tax year are typically available around March 1st through the County Assessor's office.

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