The Arlington Community Foundation (ACF) launched Arlington’s Guarantee in partnership with the Arlington County Department of Human Services in September 2021. This pilot program provides a monthly unconditional cash payment of $500 over 18 months to 200 low-income families. Target outcomes for participants include increased financial well-being, a heightened sense of personal agency, and community belonging. Arlington’s Guarantee is embedded in a larger set of public-private initiatives to boost economic mobility for residents and prevent displacement for those who live far below living-wage standards for the region, including some of Arlington’s most marginalized residents, such as undocumented immigrants and citizens returning from incarceration. Learning goals focus on how guaranteed income with no strings attached could fit as a tool to supplement restricted public benefits and address income and wealth inequality in a rapidly gentrifying place. This interim report covers activities and early observations from the pilot’s first year of operation.