The purpose of this study is to shed light on the social-economic impacts of nonprofit organizations on their communities. The literature on nonprofit organizations in Canada and the United States shows little agreement on either the impact of nonprofits or their value, and offers few frameworks within which to examine these issues.The study presents a theoretical and practical social audit model for assessing a nonprofit organizations participation in the social economy of its community. This social audit model, which can also be applied to public and private sector organizations, puts forward methods for measuring an organizations results and attributing a comparative economic value to them. The social audit model is tested on a community-based employment training agency serving persons with disabilities and other severe barriers to employment. The findings demonstrate that the agencys social return-on-investment is 1.8 times greater than the resources it utilized.This study examines nonprofit organizations as part of a social economy that also includes cooperatives and mutual benefit organizations, emphasizing their social and economic functions. Exploring the classical separation of market and social value, this study adapts a labour theory of value to suggest how nonprofits create social products and add to social capital.