This legislation establishes a Housing Supply Fund within the Community Development Financial Institutions Fund, overseen by the Secretary of the Treasury, to significantly increase the supply of affordable homes and expand housing options. The fund will provide competitive grants to eligible entities, such as certified community development financial institutions and nonprofit organizations, for the development, preservation, rehabilitation, financing, or purchase of affordable housing primarily for low-income renters and moderate-income homeowners . Grant funds can be utilized for diverse activities including providing loan loss reserves, capitalizing revolving loan funds, and establishing affordable housing mortgage funds to assist buyers facing significant barriers to credit. The bill also supports the acquisition and conversion of existing commercial properties into affordable housing, the development of resident-owned manufactured housing communities, and mixed-use or transit-oriented development projects. All assistance provided through this fund will be considered Federal financial assistance for civil rights compliance. The bill appropriates $500,000,000 annually for fiscal years 2026 through 2030, with grant recipients required to commit funds within four years or face recapture. The Secretary is mandated to ensure geographic diversity in grant distribution, reaching urban, suburban, rural, Tribal, and territorial areas, and may use up to five percent of the funds for administrative expenses.