House Report 116-450 includes a provision for the US Government Accountability Office (GAO) to report on Charter Schools Program (CSP) grants, with a particular focus on charter schools that eventually closed or never opened. This report examines the extent to which CSP-recipient schools stayed open or closed compared to non-recipient charter schools in fiscal years 2006-2020 (the most recently available comparable data) and how much CSP funding went to schools that closed or never opened during this period. GAO reviewed the three Education CSP grants that are intended to create or expand charter schools: CSP State Educational Agencies/State Entities, CSP Charter Management Organizations, and CSP Non-State Educational Agencies/Developers. GAO conducted a multivariate statistical analysis to match CSP-recipient charter schools with similar charter schools that did not receive CSP awards and compared closure rates for these two groups. GAO analyzed CSP awards data to describe funding levels for charter schools that closed or never opened. GAO reviewed relevant federal laws, regulations, and documents and interviewed federal, state, and national education organization officials. GAO incorporated technical comments from Education as appropriate.