Resources
Should you appeal?
Should you appeal?
Start here.
Plain explainers that answer the questions first: should I appeal, what could I save, and what do I do next?
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1.58Mcook homes scored
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Cook County homeowner property-tax resource
A plain-English starting point for notices, deadlines, evidence, fee choices, and the free Censum property check.
Quick answers
The questions everyone asks
“My assessment jumped. Should I appeal?”
Deadlines, evidence, and fee choices in plain English. Start here →
“When is my township's deadline?”
The current appeal-window tracker with official source links. Check windows →
“What would a percentage fee cost me?”
Run the math on 25–35%-of-savings deals before signing. Calculate it →
“What evidence actually wins?”
What to gather once the checker says an appeal looks worth it. See checklist →
“Flat fee, DIY, or a cut of my savings?”
The three ways to get appeal help, compared honestly. Compare costs →
“How does Censum score my odds?”
Six signals, 15 years of Board rulings, 1.58M homes scored. See the engine →
Tools
Decide & prepare
01
Property-tax appeal fee calculatorEstimate how much a percentage-of-savings appeal fee may cost before signing.
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02
Cook County property-tax appeal deadlines and township windowsCurrent appeal-window tracker, source links, and what to check before filing.
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03
Cook County property-tax appeal evidence checklistWhat to gather after the checker says the appeal may be worth filing.
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04
Flat fee vs percentage-of-savings appeal helpKnow the difference between doing it yourself, paying a percentage, and buying flat-fee evidence support.
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How Censum works
Under the hood
01
The Cook County property-tax appeal processCheck first, gather evidence, file in the right window, and track the decision.
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02
Sample Censum evidence packetSee what you get when the answer is yes or maybe: odds, potential savings, comps, and filing steps.
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Censum methodologyHow Censum turns public records into a simple appeal answer with evidence underneath.
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Research
Data & whitepapers
Guide directory
Browse guides by state
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Illinois
92 guides · 17 counties
Cook County76 guides
Flagship coverage, grouped by what you need.
2026 Reassessment7
The 2026 Reassessment Notice Your South/West Cook Clients Will Misread, and the Email That Wins the Listing
Your 2026 Reassessment Clock Starts the Day Your Township's Notice Mails
Got a 2026 Reassessment Notice in Cook County? Read It Before the Window Closes
The Permit Your Listing or Buyer Forgot: A Record Check Brokers Can Forward Before the 2026 Reassessment
South and west suburbs are in the 2026 reassessment. Chicago is not.
Reassessment Year on the South and West Sides: Check Exemptions and Appeal Signal Before the Clock Runs
The 2026 South/West Reassessment Intake Standard for Cook County Firms
Appeals & Deadlines12
Your Property Has Two Appeal Windows in Cook County, Not One
Your Cook County Assessor Appeal Was Denied: Read the Decision Before You Refile
Certificate of Error vs. Appeal: Which Cook County Lane Fits Your Parcel
Cook County's Staggered Appeal Calendar: A Filing-Rails Brief for Property-Tax Firms
September 24-29 is the cycle's first collision week
Of 425,806 residential reductions, 305 crossed PTAB's $100,000 line
File by September 29: Cook Countyโs two appeal clocks
Your PIN and the Map: When a Mapping or Measurement Error Becomes an Over-Assessment
The Assessor's Method: A Property-Tax Attorney's Field Guide to How Cook County Sets the Number, and the Appeal Openings It Creates
Two Ways to Win a Property Tax Appeal: Overvaluation vs. Lack of Uniformity
The Township Window Problem: Working a Cook County Book Across 38 Staggered Calendars
How the Cook County Property Tax Appeal Process Actually Works for Owners
For Brokers8
Cook County Condo Listings: The Exemption Signal in the PIN That Wins (and Closes) Deals
Your Client's Tax Bill Is a Share, Not a Sticker Price: Use It to Win the Listing
The Cook County Record That Wins Listings: What's on Your Client's PIN Before They Get the Bill
Condo Listings and the 2026 Reassessment: Why the PIN, Not the Address, Is the Story You Hand Clients
The First-Year Tax Surprise Your Buyers Don't See Coming (And How to Get Ahead of It)
Escrow Jumped After a Cook Reassessment: The Explainer Brokers Can Forward to Clients
The 2026 Reassessment Letter Is Landing in Your Farm. Be the Agent Who Explains It First.
The Four-Number Tax Bill: What to Tell Clients When Their Bill Rises After a Lower Assessment
Guides5
Condo Association Property Tax Appeals in Cook County: Why the Association Needs an Attorney (and a Unit Owner Doesn't)
PTAB and the Cook County Property Tax Appeal: When Your Case Escalates Past the Board of Review
Cook County Board of Review vs. Assessor: Two Offices, Two Sets of Rules, and the One That Requires an Attorney
How to Appeal Commercial Property Taxes in Cook County (and Why Entity-Owned Parcels Need an Attorney)
Do You Need an Attorney to Appeal Your Cook County Property Taxes?
Over-Assessment & Evidence8
Why Weak Comps Undercut a Cook County Appeal Practice
The Board grants and denies on the same comparable sentence
The Assessor ran two models on the South and West suburbs in 2026
Commercial appeals win one time in three; build the income packet
Your closing price is evidence, not a bar to appeal
A high tax bill is not the Boardโs complaint
Your Property Record Card: How to Find the Errors That Inflate Your Tax Bill
Which of Your Parcels Is Carried Too High? A Triage Framework for Owners Who Pay Real Tax
Policy & Legislation4
Policy Talk Doesn't Move Your Deadline Board. The 2026 South/West Calendar Does.
What The Bears Megaproject Bill Signals For Cook County Tax Counsel
PTELL Caps the Levy, Not the Assessment: What That Means for Your Appeal Book
Illinois HB4626 Isn't Law. Your 2026 South/West Appeal Calendar Is Real. Work the One That's Real.
Practice Intelligence13
Which 2026 Reassessment Parcels Are Worth Your Time? Read the Record First
Recent Sale Price as Appeal Evidence: A Cook County Practitioner's Triage
Evanston Township 2026 Appeal Windows: A Docket-Control Brief for Cook County Counsel
Oak Park's 2026 Appeal Window: A Firm Intake and Docket Problem
River Forest 2026 Reassessment: Calendar, Counsel Share, and Filing-Rail Notes for Cook Practices
Chicago's last reassessment produced 372,847 Board decisions
The Board called 2025 a record; the reassessment region sets the number
School Levies vs. Assessment: The Variable Your Appeal Can Actually Move
Palatine condos: 1,755 attorney-filed appeals, zero reductions
Lyons: 11,843 attorney residential decisions; hearing cap is 45
86,107 attorney-filed appeals died on paperwork
TIF Burden-Shift Is a Targeting Signal, Not Appeal Evidence: Reading the Cook County Tax Base for Your Practice
Why Cook County Tax Burdens Keep Climbing, and Where That Leaves the Assessment Lever for Counsel
Property-Tax Basics6
Your Parcel Was Valued in Bulk. Here Is Where the Model Gets It Wrong.
Read the exemption lines before you pay the October bill
Who Actually Sets Your Property Tax: The Township Assessor, the County, and the Board of Review
Functional and Economic Obsolescence: The Depreciation the Assessor Probably Missed
The Equalization Factor, Decoded: Why Your Assessment Gets Multiplied
How Cook County Values Your Commercial Building: the Income Approach, and Where It's Wrong
Township Dossiers8
Cicero Township: The Least-Represented Book in Cook's 2026 Cycle (56.8% Attorney-Filed)
Orland Township: 81.7% Attorney-Represented and a 54.4% Historical Grant Rate
Proviso Township: 156,728 Appeals and a 22% Commercial Tilt in the 2026 Cycle
Lyons Township: The 158,045-Appeal Book at the Center of the 2026 Cook County Cycle
The Characteristic-Error Appeal: A Clean Filing Lane Hiding in the County's Own Record
The 2026 Cook County Appeal Calendar Is a Trap for Volume Filers: Here's the Township Map
The 2026 South/West Sourcing Map: Where Cook County Appeal Opportunity Actually Concentrates
Stickney Township: A 37,681-Appeal Book Carrying $522M in Assessed-Value Reductions
Other Illinois counties
DeKalb County1
DuPage County1
Kendall County1
McHenry County1
Peoria County1
St. Clair County1
Texas
10 guides · 1 county
Statewide Texas10 guides
Flagship coverage, grouped by what you need.
Appeals & Deadlines2
Guides5
Texas Has No State Property Tax. So Why Is The Bill So High?
After A Texas ARB Order: District Court, SOAH, Or Binding Arbitration?
New Texas Homeowner? Your First Property-Tax Surprise May Be Timing
Texas Homestead Exemption: What To Check Before You Protest
Texas Appraisal Notice Vs. Tax Bill: The Difference That Saves Time
Over-Assessment & Evidence2
Property-Tax Basics1
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