Guides, insights, and updates on commercial property tax appeals in Cook County.
Barrington Township commercial property tax appeal data: 28% historical Board of Review win rate, 23.6% average reduction when granted. Analysis of 438 appeals.
Elk Grove Township commercial property tax appeal data: 23% historical Board of Review win rate, 20.2% average reduction when granted. Analysis of 3,413 appeals.
Evanston Township commercial property tax appeal data: 58% historical Board of Review win rate, 17.7% average reduction when granted. Analysis of 2,650 appeals.
Hanover Township commercial property tax appeal data: 17% historical Board of Review win rate, 20% average reduction when granted. Analysis of 969 appeals.
Maine Township commercial property tax appeal data: 25% historical Board of Review win rate, 19% average reduction when granted. Analysis of 2,708 appeals.
New Trier Township commercial property tax appeal data: 26% historical Board of Review win rate, 14.1% average reduction when granted. Analysis of 776 appeals.
Niles Township commercial property tax appeal data: 21% historical Board of Review win rate, 20.3% average reduction when granted. Analysis of 6,554 appeals.
Northfield Township commercial property tax appeal data: 25% historical Board of Review win rate, 19.9% average reduction when granted. Analysis of 3,927 appeals.
Palatine Township commercial property tax appeal data: 26% historical Board of Review win rate, 23% average reduction when granted. Analysis of 1,646 appeals.
Schaumburg Township commercial property tax appeal data: 29% historical Board of Review win rate, 19.7% average reduction when granted. Analysis of 1,948 appeals.
Wheeling Township commercial property tax appeal data: 21% historical Board of Review win rate, 20.8% average reduction when granted. Analysis of 6,444 appeals.
Live 2026 Cook County property tax appeal deadlines for every township. See which windows are open right now and exactly when yours closes. Updated weekly.
Cook County property tax rates by township for 2026: Barrington pays around 7%, Thornton 13%. See your township's composite rate, why it varies, and how to lower your bill.
The advantages and disadvantages of the income approach vs sales comparison in property tax appeals. Side by side comparison plus when each wins in Cook County.
The tax assessment appeal success rate in Cook County varies by township and reassessment year. From 57,960 BOR appeals analyzed: 37.5% won, 21.5% avg reduction. Full data.
The evidence needed for a Cook County property tax appeal: dated photos, comps, income docs, appraisals, and vacancy proof — organized by CCAO rule. 2026 update.
The fastest path to commercial property tax reduction in Cook County is the assessment appeal. A 15% over-assessment on a $500K AV costs $18,000/year. Here's how to fix it.
The lowest property taxes in Cook County are in Barrington (~7%) and the highest in Thornton (~13%). Full ranking of all 38 townships with the data behind each rate.
Cook County reassesses every property every 3 years on a rotating triennial cycle. In 2026 it's the south and west suburbs. Find your township's reassessment year here.
Cook County multifamily owners can appeal their property tax assessment too. Class 3 apartments are assessed at 10% of FMV. Here's what makes a winning multifamily appeal.
Just got your 2026 Cook County reassessment notice? Here's exactly what to do — how to read it, when to appeal, and how to use your 30-day window.
The 2025 Chicago reassessment produced thousands of over-assessed commercial properties. Here's what happened, what the BOR reopening means, and how to prepare for your next appeal window.
29 Berwyn Township commercial properties flagged for appeal in 2026 with avg $10,455/yr savings. Covers Berwyn, Stickney corridors.
84 Bloom Township commercial properties flagged for appeal in 2026 with avg $8,536/yr savings and $0.7M total opportunity.
24 Calumet Township commercial properties flagged for appeal in 2026 with avg $10,500/yr savings. Covers Calumet City, Burnham, Lansing.
28 Cicero Township commercial properties flagged for 2026 appeal with avg $31,618/yr savings. $0.9M total opportunity in Cicero and Berwyn.
32 Lemont Township commercial properties flagged for 2026 appeal with avg $30,709/yr savings. $1M total across Lemont and Woodridge.
28 Lyons Township commercial properties flagged for 2026 appeal with avg $59,526/yr savings. $1.7M total across La Grange, Brookfield, and more.
53 Oak Park Township commercial properties flagged for 2026 appeal with avg $14,006/yr savings. $0.7M total across Oak Park and River Forest.
12 Orland Township commercial properties flagged for 2026 appeal with avg $6,642/yr savings. Covers Orland Park, Tinley Park, Orland Hills.
33 Proviso Township commercial properties flagged for 2026 appeal with avg $30,593/yr savings. $1M total across Maywood, Bellwood, and more.
130 Rich Township commercial properties flagged for 2026 appeal with avg $11,797/yr savings. $1.5M total across Matteson, Richton Park, and more.
115 River Forest Township commercial properties flagged for 2026 appeal with avg $30,329/yr savings. $3.5M total — third-highest opportunity.
164 Riverside Township commercial properties flagged for 2026 appeal with avg $16,721/yr savings. $2.7M total — most candidates of any township.
The 2026 Cook County equalization factor (~3.0) triples your assessed value before tax rates apply. See the formula, worked examples, and appeal impact.
195 Jefferson Township commercial properties flagged as over-assessed in 2026 — the most of any township. Average savings: $18,726/year.
143 Leyden Township commercial properties flagged as over-assessed in 2026, with $3.8M in total savings. Average savings: $26,603/year.
95 Palos Township commercial properties are over-assessed in 2026, with average savings of $47,344/year. See if your property qualifies.
17 Cook County townships face reassessment in 2026. Here's what commercial property owners need to know about the new appeal rules and deadlines.
The CCAO is switching from unloaded to loaded cap rates for 2026 assessments. Here's what the change means, how the math works, and what owners should do now.
Cook County's 2026 vacancy appeal rules for commercial property: three vacancy categories, required documents, and how to file a savings-based appeal.
NNN lease properties face unique cap rate and expense ratio issues in Cook County tax appeals. Here's how to avoid the traps and build a winning argument.
Chicago commercial property tax rate 2026: composite rates by tax code (6%–13%), the 25% assessment level, and equalization factor — with a worked example.
Commercial property tax consultants help Cook County owners reduce their assessments. Here's what they do, how they work, and how to choose the right one.
Every Cook County township is reassessed on a 3-year rotation. Here's the complete map of which townships are in which triad and when they're next reassessed.
Your Cook County property tax bill contains critical numbers that determine how much you pay. Here's what every line means and where to spot over-assessment.
Your assessed value and your property's market value are not the same thing — and when they diverge, you're overpaying. Here's how to tell.
If your Cook County commercial property assessment just jumped, don't panic — but don't ignore it either. Here's a step-by-step action plan.
Assessor denied your appeal? The Cook County Board of Review gives you a second chance. How the BOR works, attorney requirements, what evidence to submit, and the 2025 reopening precedent.
Not all property tax appeal firms are the same. Here's what Cook County commercial property owners should evaluate — fee structure, track record, and approach.
Step-by-step guide to filing a Cook County property tax appeal in 2026. Check your assessment, gather comps and income data, file via SmartFile, and escalate to the Board of Review if needed.
Class 5 is Cook County's designation for commercial property — and it comes with a 25% assessment level that's lower than the rest of Illinois. Here's what that means for your taxes.
We analyzed 108,000 Cook County commercial property tax appeals. Here's what the data reveals about win rates, average reductions, and what makes appeals succeed.
Everything you need to know about appealing your commercial property tax assessment in Cook County, Illinois — from eligibility to filing deadlines.
Attorneys charge 30-40% of savings. DIY is free but risky. Here's what actually matters when deciding how to file your Cook County commercial appeal.
Use our guide to calculate your Cook County commercial property tax bill from your assessed value. Includes the equalization factor, tax rate, and savings estimate.
A half-point difference in capitalization rate can change your property's assessed value by hundreds of thousands of dollars. Here's how cap rates work in Cook County appeals.
A living guide to the 2026 Cook County property tax appeal filing schedule. Updated as the Assessor publishes new township windows.
Understanding how the Cook County Assessor values your commercial property using cap rates, NOI, and the income capitalization method.
How to spot over-assessment on your commercial property and what you can do about it before the filing deadline.
The south and west suburban triad is being reassessed in 2026. Here's what commercial property owners should expect and how to prepare.
Why arm's-length comparable sales are the strongest evidence in a Cook County commercial property tax appeal and how to find the right comps.