Property Tax Inquiries Call 713.290.9700


Property Tax Protection Program

Enroll Now

Free online enrollment in 3 minutes,
No cost unless taxes reduced, guaranteed.

Lower Your Chicago Commercial Property Taxes Now!

Property Tax Reduction Services

  • Yes, O’Connor CAN help you reduce your property taxes
  • Yes – there is NEVER a fee unless we reduce your property taxes
  • Simple online enrollment in just 2 or 3 minutes

Please take notice: 2023 appeal year deadlines are being posted in townships state-wide. If you sign up after your township’s Enrollment Deadline, we will do our best to file your 2023 appeal but cannot guarantee we will have enough time to process evidence for your appeal. Click here to see current deadlines. Click here to see current deadlines.

However, we can file an appeal for you in the 2024 tax year.

Township County Enrollment Deadline Filing Deadline
Sugar Grove Kane 7/18/2023 7/20/2023
Richmond McHenry 7/18/2023 7/20/2023
Geneva Kane 7/20/2023 7/24/2023
Chemung McHenry 8/15/2023 8/17/2023
Dundee Kane 8/17/2023 8/21/2023
Hampshire Kane 8/17/2023 8/21/2023
Kaneville Kane 8/17/2023 8/21/2023
Virgil Kane 8/17/2023 8/21/2023
Waukegan Lake 8/24/2023 8/28/2023
Blackberry Kane 9/1/2023 9/5/2023
Benton Lake 9/1/2023 9/5/2023
Cuba Lake 9/1/2023 9/5/2023
Newport Lake 9/7/2023 9/11/2023
Vernon Lake 9/7/2023 9/11/2023


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Chicago Office

  • 75 Executive Drive, Suite 349, Aurora, IL 60504
  • 708-630-0944

Property Tax Protection Program

is powered by O’Connor & Associates

Your documents and enrollment information will be emailed to you within one business day after completing basic contact information. Free enrollment; no credit card required. No upfront fees. Pay nothing unless your property taxes are reduced by us.

  • Enter your information below to enroll in the Property Tax Protection Program and have your property taxes protested.

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    Please monitor your E-mail and spam filter. If you don't receive your enrollment documents within 24 business hours, call 713.290.9700 8am - 5pm CST

  • By providing your phone number, you consent to receive phone calls, text messages and/or ringless voicemail messages from O’Connor. We will not sell or license your information and you can cancel at any time.

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ENROLL TODAY In the Property Tax Protection Program™

Your property taxes will be aggressively protested every year by the #1 property tax firm in the country. If your taxes are not reduced you PAY NOTHING, and a portion of the tax savings is the only fee you pay when your taxes are reduced! Many FREE benefits come with enrollment.

Property Tax Protection Program

Free online enrollment in 3 minutes,
No cost unless taxes reduced, guaranteed.


Enroll Now

Illinois Commercial Assessment Appeal

river and commercial buildings
O’Connor is the leading company representative for the Illinois property owners because:

  • For over 20 years, O’Connor has provided
    property tax consulting services and has continuously produced results.
  • O’Connor is the most aggressive property
    tax consultant.
  • We know the processes and appropriate
    contacts at Illinois Assessor’s Office.
  • Our experience has allowed us to compile
    sales and unequal appraisal data consistent
    with the format expected by the Illinois
    Assessor’s Office

How to Protest your Property Taxes with O’Connor

Review your property tax assessment

  • Does it look right? Do you feel it should be lower?
  • Are these mistakes?
  • Is the assessor’s market value higher than actual market value?

Enroll online with O’Connor

  • We analyze existing documents
  • Our agents research, prepare evidence and present appeals on your behalf
  • Our team coordinates a mutually agreed lawsuit when appropriate

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The Property Tax Protection Program™ Works for You!

It’s YOUR RIGHT to file a property tax appeal each year. It’s also YOUR MONEY that the County keeps when you overpay. Not anymore! Enrollment in the RISK-FREE program means your family is protected for as long as you own your home.

commercial building

  • No cost to enroll
  • Free secure customer portal designed for your convenience
  • Free subscription to tax saving tips throughout the year

Our Proven Process

  • Analyzes existing assessments
  • Researches, prepares and presents property tax appeals on your behalf at informal hearings
  • Coordinates a mutually agreed lawsuit, if appropriate

You are not billed for court costs, appraisals, expert witness fees or legal fees.
You pay us only if we reduce your taxes! You have zero risk.

ENROLL TODAY In the Property Tax Protection Program™

  • Your property taxes will be aggressively protested every year by
    the #1 property tax firm in the country.
  • If your taxes are not reduced you PAY NOTHING, and a portion of the tax savings is the only fee you pay
  • When your taxes are reduced! Many FREE benefits come with enrollment.

Property Tax Protection Program

Enroll Now

Free online enrollment in 3 minutes,
No cost unless taxes reduced, guaranteed.

About O’Connor
Property Tax Help Specialists

O’Connor provides property tax appeal services to over 100,000 clients in over 40 states. Client tax savings totaled over $120 million in 2020. O’Connor has been serving property owners since 1974, almost 50 years. Client tax savings total over $1,000,000,000.

O’Connor measures its success in client property tax savings, not billings. Our goal is to save clients $1 billion annually.

With over 200 property tax experts, many of whom have worked with us for 10+ years, O’Connor has the expertise to help with your property tax questions and appeals. We literally wrote the books on property tax reduction:

  1. Mass Appraisal for Commercial – What Every Commercial Property Owner Should Know!
  2. What You Need to Know about Business Personal Property
  3. Cut Your Texas Property Taxes
ENROLL NOW