Research suggests that there are several positive impacts of mental health programming in K-12 educational settings, including improvements in students' overall health, academic and social outcomes. Additionally, comprehensive and effective school mental health systems can lead to a variety of beneficial outcomes for schools and communities, including improved school climate and safety, reduced exclusionary discipline, and improved youth, family and educator engagement. Recognizing that education systems can support the full continuum of student mental wellness in many ways -- including universal prevention and wellness promotion, early identification, targeted intervention and treatment -- state education leaders continue to make student mental health a priority. Underscoring how crucial it is that education systems address the mental wellness of students, research shows that of those students who access the treatment they need, at least 70% begin their journey to treatment at school. In order to support the whole child throughout their educational experience, state leaders may explore how to effectively use financial resources to provide mental health services and supports to students. Funding for student mental health is used to support a variety of activities and comes from several sources, including various state and federal funding streams. This Policy Brief explores and describes common sources of funding that states use to support K-12 school-based mental health programming and provides an overview of how states use those sources of funding to serve students.