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A Strong Property Assessment Appeal Starts with Strong Comps
Stop guessing. Get property-specific sales comps and equity comps that can support a lower assessment. Use them to file with the Cook County Assessor or Board of Review.
DIY Property Tax Appeals: 60% Success at the Board of Review
You do not need an agent to file. Whether you call it a DIY property tax protest or a DIY tax appeal, strong comps make the case.
At the Assessor in 2025, DIY homeowners and agents both had a 17% success rate. At the Board of Review, DIY homeowners did better: 60% versus 48% for attorney-represented appeals.
Attorneys secured larger median reductions when they succeeded. But contingency fees can take 30-50% of the tax savings. A bigger reduction does not always mean more money in your pocket. File DIY and you keep all the savings.
See what the Cook County appeal data shows.
How Much Could You Save?
That depends on your reduction and local tax rate. Enter your Cook County address or PIN for a free overassessment check and savings estimate.
Understanding Cook County's 3-Tier Appeal System
Cook County property owners have multiple opportunities to appeal their assessments through a structured three-tier system:
Cook County Assessor's Office
The first level of appeal. File directly with the Cook County Assessor's Office within 30 days of receiving your assessment notice. This is your best opportunity for a quick resolution.
Cook County Board of Review
If unsatisfied with the Assessor's decision, appeal to the Board of Review. This three-member board reviews assessments and has the authority to make changes. Deadlines are strict - typically within 30 days of the Assessor's decision.
Property Tax Appeal Board (PTAB)
The final state-level appeal option. PTAB is a quasi-judicial body that hears appeals from across Illinois. File within 30 days of the Board of Review decision. This is your last chance for administrative review.
Important Cook County Appeal Deadlines
- Assessor's Office: Typically 30 days from assessment notice
- Board of Review: 30 days from Assessor's decision
- PTAB: 30 days from Board of Review decision
Limited-Time Offer: Get Free Assessment Appeal Comps
Check for Overassessment
Enter your address or PIN. See your assessment and estimated savings for free.
Get Your Free Comps
For a limited time, receive matched sales comps, equity comps, and a recommended assessment value.
File It Yourself
Use your report at the Assessor or Board of Review. Keep all the savings.
Understanding Comparable Properties
Comparable properties, or "comps," are the foundation of a successful property tax appeal. They provide the evidence you need to prove that your property is overassessed.
Sales Comps
Properties similar to yours that have recently sold for less than your assessed value. These show current market conditions and provide strong evidence for lowering your assessment.
- Recently sold properties (typically within 12 months)
- Similar size, age, and condition
- Same neighborhood or comparable area
- Similar lot size and features
Equity Comps
Properties similar to yours that are assessed by the county for less than your property. These demonstrate inequity in the assessment process and are particularly powerful in Cook County.
- Similar properties with lower assessments
- Same assessment year
- Comparable location and characteristics
- Shows assessment inconsistency
How Cook County Appeal Finds Your Comps
Our proprietary technology analyzes thousands of Cook County properties to find the strongest comparable properties for your appeal. We consider:
Location
Neighborhood boundaries and market areas
Property Characteristics
Size, age, condition, and features
Market Data
Recent sales and assessment trends
Cook County Rules
Local assessment guidelines and requirements
Cook County DIY Appeal Process
Filing your own property tax appeal in Cook County is straightforward when you have the right evidence. Here's your step-by-step guide:
Gather Your Evidence
Start by obtaining your evidence report from Cook County Appeal. This includes:
- Comparable sales data
- Equity comps showing assessment inequity
- Property analysis and recommended value
- Map showing comp locations
- Detailed calculations for your appeal
File with Cook County Assessor
Submit your appeal to the Cook County Assessor's Office:
- File online through the Cook County Assessor's website
- Include your property PIN and evidence report
- Submit within 30 days of receiving your assessment notice
- Keep copies of all submitted documents
Prepare for Hearing (if needed)
If your case requires a hearing:
- Review your evidence report thoroughly
- Practice presenting your case
- Bring printed copies of your evidence
- Be prepared to answer questions about your property
- Stay professional and focused on the facts
Board of Review (if needed)
If unsatisfied with the Assessor's decision:
- Appeal to the Cook County Board of Review within 30 days
- Submit additional evidence if available
- Attend the Board of Review hearing
- Present your case clearly and concisely
PTAB (Final Option)
As a last resort, appeal to the Property Tax Appeal Board:
- File within 30 days of Board of Review decision
- Submit a written petition with all evidence
- PTAB will review your case administratively
- This is your final administrative appeal option
Success Tips for DIY Appeals
Meet Deadlines
Cook County deadlines are strict. Mark your calendar and file on time.
Stay Organized
Keep copies of everything. Document all communications and submissions.
Focus on Facts
Stick to property data and comps. Emotional arguments don't work.
Be Confident
You know your property best. Present your case with confidence.
Frequently Asked Questions (FAQ)
What is cookcountyappeal.tax?
+cookcountyappeal.tax is a technology platform for finding the right set of comparable properties for your property tax appeal. We get you the best set of equity comps and/or sales comps so you stand a higher chance of getting a reduction on your assessed value!
What is a "Comparable Property Report?"
+We put together a report of properties that are similar to yours but were either sold for less than your home's market value ("sales comps") or were assessed by Cook County for less than yours ("Lack of Uniformity"). Based on public data, our proprietary technology factors in several comparable properties to arrive at a "recommended value" for your property. We also show the locations of these comps on a map.
How does the Cook County appeal process work?
+Cook County has a three-tier appeal system: 1) Cook County Assessor's Office (first level), 2) Cook County Board of Review (second level), and 3) Property Tax Appeal Board (final state level). Each level has specific deadlines and requirements. Our evidence reports are designed to work at every level of this process.
Will somebody from Cook County Appeal come to assess my property?
+No, we don't need to assess your property in person. We have developed proprietary technology that can get the task done without ever setting foot on your property. Cook County Appeal generates your evidence online, with just a few taps and clicks.
Isn't a higher assessed value better?
+This is a common misnomer! Your tax assessment has nothing to do with your property's market value, if you were to actually put it out in the market to sell. Lowering your tax assessed value just means lower property taxes.
Who represents me at the hearing?
+You do! Nobody can represent your interests better than you. All you need is evidence to prove your claims. That you got here! We do not appear for you at the hearings. Our goal is to empower homeowners to appeal by themselves, so they can keep more of the savings!