According to state statute, second half tax bills are supposed to be mailed out by August 1.  However, Cook County has not met its' statutory obligation in this regard for many years.  Over the last several years second installment tax bills have routinely arrived some time between September and early December.  This year the County Assessor passsed on the last of its work to the Board of Review on the later than usual date of April 29.  The Board is adjudicating a record number of appeals.  When the Board finishes its job, then the tax rates can be calculated by the County Clerk and the County Treasurer can print and mail the tax bills.  At this point, no one in county government can provide a reliable date when second installment tax bills will be mailed.  There is no place you can call ahead of time to find out what amount your final bill will be.