Is It My Year?

Jefferson township

2026 is not a reassessment year for Jefferson.

It is in the City triad.

Most recent reassessment
2024
Next reassessment
2027
Following
2030

Appeal win rates by triad and year

These are observed historical outcomes from the county's own appeals data, for residential class 203. ★ marks each triad's reassessment year. In all four years shown, the triad being reassessed had the highest win rate in the county. This is history, not a prediction of any individual result.

Triad2021202220232024
City33.1% ★22.3%17.7%25.8% ★
South/West12.7%14.3%23.9% ★17.4%
North13.8%27.8% ★14.4%14.7%

Across these years, appeals in a triad's reassessment year succeeded at about 27.6%, versus 15.9% in off years — about 1.74× higher.

Source: Cook County Assessor Appeals data (dataset y282-6ig3), residential class 203. Computed 2026-08-16.

To compare a specific home against similar properties, check an address.

Where an appeal can be filed

In Cook County there are two separate places a residential assessment appeal can be filed. Both are free. They are independent of each other. This tool presents both and does not tell you which to use, or whether to use either — that choice is yours.

Cook County Assessor

The office that sets the assessment. It accepts appeals first, during your township's open window.

Filing is free.

The filing window opens and closes on a rolling, per-township schedule. Check the county's published calendar for Jefferson.

Assessor deadlines calendar  ·  Assessor's blank appeal form

Cook County Board of Review

A separate elected body. It hears appeals after the Assessor's window closes for your township, in its own window.

Filing is free.

The Board of Review opens township by township after the Assessor's window. Check its published calendar for Jefferson.

Board of Review status & dates  ·  Board of Review's blank appeal form

This tool links only to the county's own blank forms. It does not fill out, generate, or complete any appeal form, because in Illinois completing a property tax assessment complaint is the practice of law (In re Yamaguchi, 118 Ill. 2d 417 (1987)). It also never contacts the Assessor, the Board of Review, or any county official on your behalf.