The Fostering Learning and Excellence in Charter Schools Act, or FLEX Act, aims to provide greater flexibility and support for federal programs assisting charter schools by amending the Elementary and Secondary Education Act of 1965. It expands the purposes for which federal funds can be used, including the addition or expansion of programs at high-quality charter schools and the strengthening of charter schools generally. The bill revises funding allotments, increasing minimum percentages for various support categories and specifying how remaining funds must be utilized for facilities, national activities, and high-quality charter school grants. A significant change is the mandate for advance payments of grant and subgrant funds, which will improve cash flow for charter schools and state entities. It also clarifies that nothing in the law prohibits schools from providing single-sex educational services . Furthermore, the FLEX Act broadens the allowable uses of grant funds to include costs for hiring and compensating specialized instructional support personnel , academic subscriptions, curricular support, and necessary facilities renovations or repairs, including acquiring portable classrooms. It also permits funding for operations and management of charter school facilities , removing previous "one-time, startup" or "non-sustained" limitations on certain costs. The legislation also streamlines administrative processes by allowing state entities to accept an eligible applicant's approved charter authorization application in lieu of a separate subgrant application under certain conditions. It requires state entities to ensure charter schools address student transportation needs . For national activities, the bill reallocates funds to support early-stage planning, increase seats in rural areas or for students with disabilities, and facilitate the expansion of charter management organizations into new states or those with limited charter options. Finally, the Act mandates that the Secretary of Education consult with charter school operators prior to issuing proposed rulemaking and limits the Secretary to promulgating only necessary regulations , prohibiting the imposition of additional nonstatutory requirements on charter schools or state entities.