Today, the Cook County Treasurer’s Office website is indicating that the first installment of Cook County real estate tax bills for 2015 are now available. Usually, the bills come out in February, so this release is quite early this year. The first installment tax real estate bill in Cook County is always 55% of the prior year’s full year tax bill. To check the tax bill for 2015, property owners can visit the Treasurer’s website and type in their property index number. Remember, because the first installment bill is always a fixed amount, any increase or decrease in the tax bill (as a result of higher tax rates or new assessments) will be reflected on the second installment tax bill. The 2016 cook county tax bill – first installment – is due to be paid to the Cook County Treasurer by March 1, 2016.