
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.
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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.
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.
Illinois Commercial Assessment Appeal

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

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.

- 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:
- Mass Appraisal for Commercial – What Every Commercial Property Owner Should Know!
- What You Need to Know about Business Personal Property
- Cut Your Texas Property Taxes
