In 2016, the City and County of Denver launched the Denver Supportive Housing Social Impact Bond Initiative (Denver SIB) to shift resources from expensive emergency services to more permanent, affordable housing and supportive services that can be difficult to fund without up-front capital. The initiative aimed to increase housing stability and decrease jail stays for people trapped in the homelessness-jail cycle. This report details the costs of supportive housing provided by the Denver SIB and the costs and cost offsets associated with supportive housing’s effects on outcomes across the housing and homelessness assistance, criminal justice, and health care systems.