Information checked October 31, 2026. Deadlines can change; confirm the date on the agency’s own site before you file. This post is general information, not legal or tax advice.
As of October 31, 2026, four City of Chicago townships have a property tax appeal window open: West Chicago at the Cook County Board of Review until November 6, 2026, and Jefferson (until November 12), North Chicago (until November 24) and South Chicago (until December 15, 2026) at the Cook County Assessor’s Office.
Cook County property owners can appeal an assessment in two places, at different times: first the Assessor’s Office, then the Board of Review. Each township gets its own window at each agency. This post lists the windows open now for the townships inside the city.
Appeal windows open now (as of October 31, 2026)
| Township (City of Chicago) | Agency | Window started | Last day to file | Source |
|---|---|---|---|---|
| West Chicago | Cook County Board of Review (2026 Group 3) | Opened October 8, 2026 | November 6, 2026 (evidence due November 16, 2026) | Board of Review, 2026 session dates |
| Jefferson | Cook County Assessor’s Office | Notices mailed September 29, 2026 | November 12, 2026 | Assessor 2026 calendar |
| North Chicago | Cook County Assessor’s Office | Notices mailed October 9, 2026 | November 24, 2026 | Assessor 2026 calendar |
| South Chicago | Cook County Assessor’s Office | Notices mailed October 30, 2026 | December 15, 2026 | Assessor 2026 calendar |
Already closed at the Assessor in 2026
- West Chicago: closed August 21, 2026 at the Assessor (its Board of Review window is the one open now).
- Hyde Park: closed October 8, 2026.
- Lake: closed October 29, 2026.
Source: Cook County Assessor, 2026 Assessment & Appeal Calendar, checked . As of that date, the Board of Review’s 2026 schedule listed no dates yet for Jefferson, North Chicago, South Chicago, Lake or Hyde Park.
Two agencies, two windows
- Assessor’s Office. The Assessor’s calendar gives each township a “last file date”; in its words, an owner “has until the date listed under ‘last file date’ to file an appeal.” The calendar also says owners “are allowed to file an appeal with the Assessor’s Office and at the Board of Review.” (Checked .)
- Board of Review. The Board of Review opens townships in groups. In 2026, Group 3 (Lyons, Northfield, Stickney and West Chicago) opened October 8 and closes November 6, with evidence due November 16. It takes appeals online through its appeals portal, or on a complaint form delivered or mailed to the Board. (Board of Review, Residential Appeals, checked .)
Is 2026 a reassessment year for Chicago?
No. The Assessor’s Office says: “This year, in 2026, the south and west suburbs of Cook County is scheduled to be reassessed.” Its list of past reassessments places the City of Chicago townships, including West Chicago, Jefferson, North Chicago and South Chicago, under “2024 City of Chicago.” As the table above shows, Chicago townships still have 2026 assessment notices and appeal windows. (Cook County Assessor, Valuation Reports, checked .)
What this post does not cover
Whether an appeal makes sense for a particular property, any filing fee, and which year’s tax bill a 2026 appeal affects. The agency pages we checked do not state the last two; ask the Assessor’s Office or the Board of Review directly.
Sources
- Cook County Board of Review, Dates and Deadlines 2026 Session (PDF). Checked October 31, 2026.
- Cook County Board of Review, news release on Group 3, dated October 7, 2026. Checked October 30, 2026.
- Cook County Board of Review, Residential Appeals. Checked October 30, 2026.
- Cook County Assessor’s Office, Assessment & Appeal Calendar (last updated 10/30/26). Checked October 31, 2026.
- Cook County Assessor’s Office, Valuation Reports. Checked October 31, 2026.