Decades of data attest to high rates of teacher turnover. Almost half of new teachers leave the profession within 5 years. For the past 10 years, turnover has leveled off at a disconcerting 16% per year. High turnover impedes student performance and diverts resources away from efforts to improve schools. It places large numbers of inexperienced, less effective teachers in classrooms, resulting in increased recruiting, hiring, and training budgets. With effective retention, the United States could save a meaningful portion of the $2.2 billion spent annually on replacing teachers. Research shows that increases in teacher turnover consistently correspond with decreases in achievement in core academic subjects. Attrition disproportionately affects schools with the greatest needs, low-achieving and high-poverty schools. Chronic turnover also negatively impacts a school’s culture, increasing student disciplinary problems and principal turnover. It damages collegiality, adding chaos and complexity to schoolwide operations and perpetuating new cycles of turnover. Effective interventions can remediate this situation, but they require administrators’ long-term commitment to improve the learning environment and working conditions. Citation: Donley, J., Detrich, R, Keyworth, R., & States, J. (2019). Teacher Turnover Impact. Oakland, CA: The Wing Institute. https://www.winginstitute.org/teacher-retention-turnover