Cook County · North & Northwest suburbs
Northfield Township Property Tax Appeal — 2026 Deadlines & Filing Windows
Everything a Northfield homeowner needs to appeal an over-assessment this year: the current filing window, where you sit in the reassessment cycle, how over-assessed Northfield homes are, and a plain walkthrough to file your own appeal — free, keeping every dollar you save.
Northfield Township’s 2026 Assessor appeal window opens later this year — Northfield was last reassessed in 2025 and is next up in 2028. By ChonkHub’s read of the public roll, about 10.7% of Northfield’s 23,863 assessable homes and condos are assessed above comparable local properties, a median of $5,665 a year in likely over-assessment. Historically, 24.1% of Northfield residential appeals to the Assessor have won a reduction, and the Board of Review is a free second chance after that.
When is the property tax appeal deadline in Northfield Township?
Northfield Township’s 2026 appeal window with the Cook County Assessor has not been published yet. Cook opens each township on a rolling schedule through the year; the exact deadline appears on your Reassessment Notice and on the Assessor’s calendar. Check back or confirm directly with the Assessor.
| Township | Reassessment group | Window opens | Deadline | Status |
|---|---|---|---|---|
| Northfield Township | North & Northwest suburbs | — | To be announced | Opens later in 2026 |
Source: Cook County Assessor Assessment & Appeal Calendar, as of 25 June 2026. Confirm on cookcountyassessoril.gov →
Is Northfield Township being reassessed in 2026?
Northfield Township is in the Assessor’s North & Northwest suburbs reassessment group, which Cook County reassesses once every three years. Its most recent reassessment was 2025; the next is 2028. You can still appeal in 2026 even though it is not a reassessment year.
What towns are in Northfield Township?
Northfield Township covers Northbrook, Glenview, Northfield in Cook County — Northbrook is the largest share, about 49% of its homes. Your township is determined by where the property sits, not your mailing address, and it sets your filing deadline: homeowners across these towns file on the same 2026 Northfield schedule.
How over-assessed are homes in Northfield Township?
By ChonkHub’s read of the public roll, about 10.7% of 23,863 assessable dwellings in Northfield Township are assessed materially higher than comparable local properties, a median of $5,665 a year in likely over-assessment. It is a population estimate — whether your specific home is over-assessed is a per-parcel question the address check answers directly.
Across Cook County, roughly 124,411 dwellings are strongly over-assessed. See the full over-assessment report and method →
What are the odds of a successful Northfield Township appeal?
In Northfield Township, about 24.1% of residential appeals to the Assessor have historically won a reduction — and the Board of Review, a separate second stage, reduces assessments again for many who get little from the Assessor.
Northfield Township — appeal outcomes at the Assessor
| Appeal type | Appeals | Reduced | Median cut |
|---|---|---|---|
| residential | 23,628 | 24.1% | 8.1% |
| condo/coop | 9,083 | 14.5% | 6.8% |
| commercial | 1,267 | 42.1% | 10.5% |
| land | 57 | 10.5% | 83.4% |
Countywide, the Assessor reduces about 25.0% of appeals and the Board of Review about 31.9%. Full outcome data by year →
How do I appeal my property taxes in Northfield Township?
You appeal in up to two free stages — first the Cook County Assessor, then, if needed, the Board of Review — filing as the property owner with comparable properties as your evidence. In Northfield Township, start before your window opens: confirm you are over-assessed, gather comparables, and file on the county’s free portal.
Read the full step-by-step guide → · Common questions →
Check your address — freeSee your own assessment math before you file. You keep 100%.