Tennessee Investment in Student Achievement (TISA) - As enacted, requires the TISA review committee to study and include in its annual report recommendations for how this state may revise the ways in which it identifies economically disadvantaged students to ensure this state is accurately identifying the students in need of additional resources and recommendations for how this state may better support economically disadvantaged students through the TISA. - Amends TCA Title 49, Chapter 1 and Title 49, Chapter 3.

HB 2485 updates Tennessee's definition of "economically disadvantaged" students to include those directly certified for free school meals (without household applications) and students from households receiving SNAP, TANF, FDPIR, or Medicaid benefits. This change affects school districts (LEAs) receiving state education funding under the TISA formula, as it alters how student need is measured for allocation purposes. The bill requires the state to provide additional funds to any district whose TISA allocation decreases due to fewer identified disadvantaged students under the new definition, ensuring funding levels match prior years for the 2027-2028 school year through 2029-2030. It also mandates the state seek federal approval to update its ESSA plan to align with this revised definition.