The due date for the Tax Year 2016 First Installment was Wednesday, March 1, 2017.
In Cook County, the due date for the First Installment property taxes is always the first business day in March. According to Illinois law, the First Installment taxes are 55% of the prior year's total tax (or 55% of the adjusted tax if an assessment certificate of error is certified by the previous November 30).
The tentative due date for the Tax Year 2016 Second Installment is August 1, 2017.
The Second Installment due date may vary. This is because the Second Installment bill relies on the delivery of various sets of data by other state and county agencies. Unlike the First Installment bill, the Second Installment bill reflects the new assessed values, assessment appeals, exemptions, state equalization factor, and taxing-district tax rates.
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