The federal Individuals with Disabilities Education Act (IDEA) entitles students with disabilities to a free appropriate public education. Students with disabilities often require additional support to enable them to achieve academic and functional goals relative to their nondisabled peers. These legally protected supports and services all add up to a need for additional school funding to support the education of children with disabilities. This brief examines how states and the federal government allocate funding to support the educational needs of students with disabilities and identifies questions that state advocates and policymakers can pose to better understand and improve their state's system for funding special education services.