Cook County property tax
New Trier Township property tax appeal guide
New Trier Township filing window
Next window: the Assessor and Board of Review each open once a year; check your property now so you're ready.
Check your New Trier property freeNew Trier Township follows the North Triad calendar, with a 2025 reassessment and the next reassessment scheduled for 2028. That schedule attaches to the township, not to the municipality shown in a property's mailing address. Reassessment years are not the only years with access to review, because the Board of Review opens a New Trier Township window every year.
Evidence to review
- Do not use a newly rebuilt or substantially enlarged home as a proxy for an older residence without accounting for age, size, and construction differences.
- Compare bathroom counts and basement finish in the Assessor records, especially when the homes have similar exterior forms but different interior utility.
- Examine frontage, lot shape, and exposure to traffic or commercial activity before concluding that two nearby sites are alike.
- Choose recent recorded sales from the same assessment neighborhood and state why each one is a closer physical match than the alternatives.
Official sources
Cook County Assessor calendar · Cook County Board of Review appeals
You file directly with Cook County for free. We provide optional research, not representation or guaranteed savings.
Editorial guidance reviewed 2026-09-19. Filing dates are checked separately.