How to Read Your Block's Appeal Pipeline — Mailed vs. Certified vs. Board

Most Chicago owners see one assessment number and assume that's the number. In Cook County, there are usually three, and the difference between them is the whole story of an appeal. Learn to read the sequence and you can tell, at a glance, whether the properties around you fought their assessments — and won.

The three stages, in plain English

• Mailed — the Assessor's first-pass value, the one that arrives in your mailbox. This is the opening number, not the final one.
• Certified — the value after the Assessor-level appeal (a re-review or Certificate of Error). If you appealed to the Assessor and got a reduction, it shows up here.
• Board — the value after the Board of Review, an independent body, issues its decision. This is the final assessed value for the year.

The stages run in order: mailed first, then certified, then board. Not every parcel reaches every stage in every year — if no one appealed, the mailed value can simply carry through.

Reading the direction

Here's the tell. When a certified or board value lands below the mailed value, an appeal reduced the assessment. When the numbers hold flat across stages, the mailed value stood. Track that year over year and you're reading the appeal behavior of your block: a street where board values routinely dip below mailed is a street where owners are working the process — and possibly where the first-pass values are running high.

A stage word on every number

This is why "what's my assessment?" is a slightly incomplete question in Cook County. The honest answer is always "as of which stage?" A board value from two years ago and a mailed value from this year are not the same kind of number, and comparing them without the labels is how people scare themselves. Every assessed figure carries its stage.

What about the appeal window?

Appeal windows in Cook County open and close by township, on a schedule the county sets each cycle. When there is an open window on record for a parcel, Civic Worth flags it. When there isn't one on record, the report says so rather than inventing a date — because a wrong deadline is worse than no deadline. Treat the flag as a prompt to confirm with the Assessor's or Board's official calendar, not as legal advice.

See your own parcel's progression

On a Chicago parcel report, the tax section lays out the mailed → certified → board values for the years on record, so you can see your own progression and how it compares to the block around you. If you're heading into the 2027 Chicago reassessment, this is the sequence your new mailed value will enter.

Find your parcel from the Chicago hub or your community area — Logan Square, Hyde Park, Austin, or any of the 77. Every address resolves to its 14-digit PIN and its full assessment history, three stages and all.