The Housing Accelerator Fund (HAF) is a federal program launched in 2023 that provides funding to municipalities committing to actions that speed up housing construction. Unlike traditional infrastructure funding for specific projects, HAF ties funding to policy changes: municipalities must make zoning reforms allowing more housing density, streamline development approval processes, eliminate exclusionary rules like minimum parking requirements, and commit to building more affordable housing. The program represents a significant federal intervention in municipal land use planning—areas traditionally under local control. Supporters argue the housing crisis requires bold action and that federal leverage is necessary to overcome local opposition to housing development. Critics view HAF as federal overreach into municipal jurisdiction and potentially one-size-fits-all solutions for diverse communities. Early HAF agreements have committed billions in funding while requiring substantial municipal policy changes.