The Housing Choice Voucher (“HCV”) program is a government program that subsidizes the rent of low-income individuals or families, allowing them to afford housing in the private market. Families pay 30 percent of their income towards rent, and the voucher covers the remainder. Congress created the program with the goal of enabling low-income families to live in high-opportunity neighborhoods, thereby improving family outcomes and eliminating the concentrations of poverty often seen with other low-income housing programs. This goal has failed, however, largely due to landlord discrimination against voucher holders. Many families are unable to find housing that will accept their voucher. For families that do find housing, they are unable to access the low-poverty neighborhoods the HCV program promised. For families of color, discrimination has an especially significant effect. To improve the success of the HCV program, this Note argues that policymakers must limit the ability of landlords to refuse to accept HCVs and that the most effective method for doing so is through Source of Income (“SOI”) discrimination laws that prohibit discrimination against voucher holders.