Northfield Township property tax appeal 2026
Northfield Township homeowners can appeal their 2026 assessment with the Cook County Board of Review until Friday, November 6, 2026, with evidence due by November 16, 2026. Filing is free and online, and you do not need a lawyer.
- File by Nov 6
- Free to file
- About 15 minutes
Updated October 22, 2026. Dates from the Cook County Assessor and Board of Review calendars.
15 days left
Is your Northfield Township home assessed too high?
Free check from the county’s own records. About 10 seconds.
Key dates for Northfield Township
Every township gets two chances a year: the Assessor first, then the Board of Review.
Done
Assessor appeals open
Friday, July 24, 2026
Assessment notices mailed
Done
Last day to file with the Assessor
Friday, September 4, 2026
Done
Board of Review appeals open
Thursday, October 8, 2026
Next
Last day to file with the Board of Review
Friday, November 6, 2026
Next
Board of Review evidence due
Monday, November 16, 2026
Towns in Northfield Township
- Glenview
- Northbrook
- Northfield
- Prospect Heights (part)
- Deerfield (part)
Some towns are split between townships. Your assessment notice names yours, and our free check sorts it for you.
What the public records show
We checked 31,987 homes in Northfield Township against the county’s 2026 assessments and recorded sales. 8,368 (26%) are assessed higher than similar homes nearby or above what similar homes sold for, with a median estimated saving of about $1,000 a year.
Share of homes that may be assessed too high, by town
- Northbrook26%4,018 of 15,380
- Glenview26%3,839 of 14,819
- Northfield32%493 of 1,550
Estimates from public records, not a promise; the county decides every appeal.
How to file with the Cook County Board of Review, step by step
For the window that is open now. Illustrations, not screenshots; the county’s site may look a little different.
- 1
Find your PIN
Your 14-digit property index number is on your assessment notice and your tax bill, and at the top of a Morganwell packet.
- 2
Open the Board of Review site
Go to appeals.cookcountyboardofreview.com and create a free account (an email address is all you need).
- 3
File your appeal for your PIN
Start a residential appeal for your PIN and file it by November 6, 2026. You can file here even if you did not appeal with the Assessor.
- 4
Upload your evidence
Upload your comparable homes or sales from your packet. The Board's form lists what your appeal type needs, often including a recent photo of the front of your home. Evidence is due by November 16, 2026.
- 5
State the value you are asking for
Give the assessed value you think is fair, based on your evidence. Your packet has the figure and what to write.
- 6
Save your confirmation
Keep the confirmation. The Board mails its decision, and you can check the status online.
The ways homes usually win
Lack of uniformity
Your home is assessed at more per square foot than similar homes in the same neighborhood and class. Three to five comparable homes nearby make the case.
Overvaluation
Similar homes sold for less than the value the county gives yours. Recent arm's-length sales count; foreclosure auctions and bank sales do not.
Your own purchase
If you bought recently for less than the county's value, your closing price is strong evidence. The Assessor asks about sales in the last two years, the Board of Review the last three, and you must disclose a sale in that time either way.
Condo owners: the strongest evidence is usually recent sales of other units in the same building.
What good evidence looks like
Similar homes, side by side, compared per square foot. Here the first home is assessed higher than its neighbors.
| Home | Address | Sq ft | County value | Per sq ft |
|---|---|---|---|---|
| Your home | 1200 Example Ave | 1,450 | $312,000 | $215 |
| Similar home | 1214 Example Ave | 1,420 | $268,000 | $189 |
| Similar home | 1309 Sample St | 1,500 | $279,000 | $186 |
| Similar home | 1122 Model Ct | 1,390 | $255,000 | $183 |
An illustration with made-up homes. Your packet lists the real comparable homes with their PINs, addresses and county values.
After you file
- Step 1
Assessor decides
Usually several weeks after the township's window closes. The result comes by mail.
- Step 2
Board of Review
Not lowered enough? Appeal again when the township opens there. You can file there even if you skipped the Assessor.
- Step 3
State appeal board
Still disagree? You can go to the Illinois Property Tax Appeal Board within 30 days of the Board of Review's decision.
Northfield Township was last fully reassessed in 2025; the next full reassessment is in 2028.
Northfield Township appeal questions
- When is the Northfield Township property tax appeal deadline in 2026?
- The Cook County Board of Review accepts 2026 appeals for Northfield Township until Friday, November 6, 2026. Evidence is due by November 16, 2026.
- Which towns are in Northfield Township?
- Glenview, Northbrook and Northfield, plus parts of Prospect Heights and Deerfield. Your assessment notice names your township.
- Was Northfield Township reassessed in 2026?
- No. Northfield Township was last fully reassessed in 2025 and is next reassessed in 2028. The Assessor still opens an appeal window every year, and a lower value won on appeal may carry until the next reassessment, depending on where it was won.
- Does it cost anything to appeal?
- No. Filing with the Cook County Assessor and with the Board of Review is free, and homeowners can file for themselves without a lawyer.
- How do I know if my home is assessed too high?
- Compare it with similar homes nearby: same neighborhood, class, size and age. If yours is assessed higher per square foot than most of them, or above what similar homes sold for, that is the evidence the county asks for. Morganwell's free check does this comparison from the county's own records.
- Can I appeal at the Board of Review if I did not appeal with the Assessor?
- Yes. The Board of Review accepts appeals whether or not you filed with the Assessor first.
- How many Northfield Township homes may be assessed too high?
- Morganwell checked 31,987 homes in Northfield Township against the county's 2026 assessments and recorded sales. 8,368 of them (26%) are assessed higher than similar homes nearby or above what similar homes sold for, with a median estimated saving of about $1,000 a year. These are estimates from public records, not a promise; the county decides.
- Can condo owners appeal?
- Yes. For a condominium unit the strongest evidence is usually recent sales of other units in the same building. Morganwell's free check covers condo units as well as houses.
Guides for other townships
Morganwell is not a law firm and does not give legal or tax advice. You file your own appeal. Packets are compilations of public records, not appraisals. No outcome is guaranteed.