Disclosures

Censum LLC is a data and analytics company. We do not practice law or provide legal advice. If you add Concierge, a licensed Illinois real-estate-tax attorney files on your behalf — and your attorney-client relationship is with them, not with us.

Nothing on this site is tax advice. A property tax appeal affects your assessed value; it does not directly set your tax bill, which depends on county levies and your school district's rate. Consult your own advisor about how a reduction flows through.

The 86.1% figure is model precision at the top decile on the Cook County Board of Review's 2024 decision set. It means: of every 100 PINs the model ranked in the top 10% by conviction, 86 received an assessed-value reduction. That is not an income guarantee, and past performance is not a prediction of future results. Full methodology and validation protocol are on the methodology page.

This is a statement of Cook County Board of Review procedure, not a Censum guarantee. The Board can lower an assessed value or leave it unchanged; it cannot raise it in response to an appeal. If that procedure ever changes, we will update this page.

Every number on this site traces back to a public source: the Cook County Assessor's Office open data portal and the Cook County Board of Review decision records. We do not scrape private sites, buy data from brokers, or rely on undisclosed proprietary datasets.

Tier A purchases are covered by a credit-forward guarantee: if the Board of Review does not reduce your assessed value, 100% of your fee is credited toward next year's packet. This is a future credit, not a cash refund. Tiers B and C are sold without this guarantee and are priced accordingly. See the guarantee page.