Alliance Report on Teacher Attrition highlighted in MichiganWhen a teacher leaves the classroom for good, it's an expensive proposition to not only fill the position but replace that experience. How expensive? As much as $59 million for Michigan schools. The Alliance for Excellent Education calculated estimates of how much teacher attrition costs, and puts the total expense for Michigan's public schools somewhere between $27 and $59 million a year. Those figures are based on the average costs for a not-poor, rural district and a low-income urban district to replace a teacher, multiplied by the estimated amount of turnover public school districts across the state experienced in 2008-2009.