The 60-second version
The Board of Review appeal window for New Trier Township opened August 3, 2026 and closes September 1, 2026. Appeals are filed township by township in Cook County, so this window applies to every New Trier parcel. Miss it and the next chance is the following venue or the following year. Check your parcel now (free lookup) or see every township's current dates.
What the Board of Review window means for New Trier homeowners
Cook County property owners get two cracks at an assessment each year: first at the Assessor, then at the Board of Review. The two are independent — a loss (or a pass) at one does not prevent filing at the other, and the Board decides tens of thousands of residential appeals every cycle. New Trier sits in Cook County's north triad; in a reassessment year the whole township's values move at once, which is when uniformity appeals matter most.
What New Trier appeals actually did, year by year
These are county-published outcomes for ALL residential (Class 2) appeals filed in New Trier Township — every appellant, represented or not, not this firm's results:
| Tax year | Venue | Appeals decided | Received a reduction | Avg. cut (of AV, winners) |
|---|---|---|---|---|
| 2026 | Assessor | 7,648 | 1,357 (18%) | 7.5% |
| 2025 | Board of Review | 14,722 | 7,431 (50%) | 7.4% |
| 2025 | Assessor | 13,597 | 3,866 (28%) | 8.0% |
| 2024 | Board of Review | 8,257 | 3,275 (40%) | 6.9% |
| 2024 | Assessor | 4,409 | 615 (14%) | 10.6% |
| 2023 | Board of Review | 9,365 | 3,835 (41%) | 7.7% |
| 2023 | Assessor | 5,605 | 1,171 (21%) | 10.5% |
| 2022 | Board of Review | 13,387 | 6,494 (49%) | 8.9% |
| 2022 | Assessor | 11,918 | 3,748 (31%) | 11.1% |
| 2021 | Board of Review | 6,971 | 2,494 (36%) | 7.8% |
| 2021 | Assessor | 3,566 | 513 (14%) | 12.8% |
| 2020 | Board of Review | 8,373 | 3,048 (36%) | 8.3% |
| 2019 | Board of Review | 12,585 | 6,970 (55%) | 9.7% |
| 2018 | Board of Review | 6,715 | 3,603 (54%) | 9.1% |
| 2017 | Board of Review | 7,547 | 4,611 (61%) | 10.1% |
| 2016 | Board of Review | 12,716 | 9,520 (75%) | 9.4% |
| 2015 | Board of Review | 3,950 | 2,135 (54%) | 9.2% |
| 2014 | Board of Review | 4,671 | 2,462 (53%) | 8.4% |
| 2013 | Board of Review | 10,329 | 7,653 (74%) | 8.4% |
| 2012 | Board of Review | 3,615 | 2,357 (65%) | 9.3% |
| 2011 | Board of Review | 3,726 | 2,558 (69%) | 9.7% |
| 2010 | Board of Review | 9,367 | 6,958 (74%) | 8.5% |
| 2004 | Assessor | 7,149 | 2,690 (38%) | 7.0% |
| 2003 | Assessor | 602 | 240 (40%) | 10.5% |
| 2002 | Assessor | 695 | 268 (39%) | 12.0% |
| 2001 | Assessor | 6,123 | 2,380 (39%) | 7.7% |
Read these within their year: reassessment years pull win rates and cut sizes around for the whole township, so the fair comparison is same-year, same-class, same-venue.
New Trier's tax math: why the window is worth 15 minutes
The median New Trier residential assessment is about $99,000 of assessed value. At the state equalizer (3.03) and New Trier's average local rate (~7.91%), that assessment produces roughly $23,728 of gross tax before exemptions. Among last cycle's successful New Trier appeals, the average reduction was about 7.4% of assessed value — on the median home, arithmetic of roughly $1,756 per year. Your parcel's numbers are what matter: run them in the calculator.
How to appeal your New Trier assessment before September 1, 2026
- Look up your property and compare its assessment per square foot against comparable New Trier homes — uniformity is the argument the county's own process is built around.
- Confirm the window on the deadlines page — dates are per township and per venue.
- File before September 1, 2026. Evidence can usually be supplemented after filing within the venue's posted evidence period.
Fees are contingency-only (no upfront cost); see the appeal FAQs for how the process runs end to end.
What happens after you file
The Board of Review reviews the complaint against its own records and the comparables submitted. Most residential appeals are decided on the papers — no hearing, no visit, and in practice a residential appeal results in either a reduction or no change. Decisions typically arrive after the township closes, and a certified change flows into the second-installment bill.
If you miss this window
The two venues are sequential: a New Trier owner who misses the Board of Review window is done for this cycle at the county level, though the following year brings both windows again. The deadlines page tracks every township's next window as the county publishes it.
