Teachers are crucial to the success of students. Yet, many of them are leaving their schools and the profession every year, particularly in poorer, lower-performing schools. As in any profession, not all attrition is bad, but whether bad or good, it has financial ramifications. This article explores the costs associated with teachers leaving the profession and their schools, the characteristics of those likely to leave, and what can be done to prevent turnover. High-quality, comprehensive induction can give teachers the tools necessary to succeed in challenging classrooms and help new teachers become effective in a shorter amount of time. Simultaneously, it further develops the skills of veteran teachers. And when combined with improved working conditions, comprehensive induction provides an environment of success for teacher--an environment that is crucial to equalizing the quality of education for all students.