Tennessee Investment in Student Achievement (TISA) - As introduced, expands the category of students who are considered economically disadvantaged for purposes of generating a weighted allocation through the TISA funding formula to include students who are enrolled in the state's medicaid program. - Amends TCA Title 49.

SB 2477 amends Tennessee's education funding formula (TISA) to include students enrolled in the state's Medicaid program as "economically disadvantaged," expanding eligibility for weighted funding. This change directly affects schools serving Medicaid-enrolled students, who will now qualify for additional state funding under TISA. The bill updates the legal definition in TCA Title 49 to add Medicaid enrollment as a criterion, alongside existing categories like foster youth or free/reduced-meal eligibility. The policy change takes effect for the 2026-2027 school year and applies to all future TISA allocations.