Opponents of public charter schools frequently contend that they drain resources from traditional public schools--a potentially serious charge. But of course, it makes sense that traditional school districts get less money when they enroll fewer students. So from a policymaking perspective, the real question is whether districts' financial capacity to meet students' needs is compromised by charters' presence. This brief addresses that question and several key subquestions by synthesizing the latest and most rigorous research on charters' fiscal and academic impacts on district schools.