Cook County Illinois Tax Extension Unit - How Real Estate Tax Rates are Calculated

How tax rates are calculated:

The Cook County Assessor's office establishes property valuations.

Taxing districts file their levy requests with the Clerk's Tax Extension Unit.

To produce the revenue requested, the Tax Extension Unit uses the levy to determine the tax amount to be "extended" against all properties located within the boundaries of the taxing district.

The Clerk's Tax Extension Unit determines the rate needed per $100 of taxable value to generate the requested revenue, based on the value of all taxable property within the district boundaries.

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