The Full-Service Community School Expansion Act of 2026 authorizes $500 million to $1 billion annually from 2027 through 2031 to help schools serving low-income and academically struggling students transform into full-service community schools that provide integrated health, mental health, and social services alongside academic instruction. Schools participating in the program must establish six core pillars: integrated student supports, expanded learning time, family and community engagement, collaborative leadership, rigorous instruction connected to local communities, and positive school culture, with progress tracked through a results framework measuring outcomes like academic engagement, student health, and college readiness. The bill creates a competitive grant program offering planning grants up to $100,000, implementation grants of $250,000 or more annually, and expansion grants of $300,000 or higher, with priority given to high-need districts, rural areas, and tribal schools. States and schools receiving funds must establish leadership teams that include parents, educators, students, and community partners, conduct community needs assessments, hire full-time community school coordinators, and report publicly on outcomes and spending. The legislation also establishes a technical assistance center and creates a separate program for Bureau of Indian Education schools to support implementation nationwide.