04/29/2026
This 2.8683 multiplier in Cook County is the state stepping in with a magnifying glass 🔍 and saying, “Let’s make sure assessed values line up with the rest of Illinois.”
Here’s what it means in plain terms:
Cook County calculates an initial assessed value
The state applies this equalization factor (multiplier)
Final Equalized Assessed Value (EAV) = Assessed Value × 2.8683
👉 If that multiplier goes up, your taxable value usually goes up
👉 If it goes down, the opposite