Tennessee Investment in Student Achievement (TISA) - As introduced, adds pre-kindergarten students with special education needs and their peer models to the categories of students who generate education funding through the TISA. - Amends TCA Title 49.

HB 401 amends Tennessee's education funding formula (TISA) to include pre-kindergarten students with special education needs and their "peer models" (typically developing children in the same classroom) as categories generating state funding. This change expands the existing K-12 student-based funding system to cover these pre-K students, ensuring their enrollment directly impacts TISA allocations. The bill defines key terms like "peer model" and clarifies that funding for these students won't reduce other state education funds for the school district. It applies to the 2025-2026 school year and beyond, directly affecting pre-K programs serving students with disabilities in inclusive settings.