One of the structural problems in Colombia is the informality of economic activities. Indeed, there is a high proportion of informal retailers in large cities of the country. This chapter propounds a tool, Credit Scoring, for the financial inclusion of this population. The tool is designed for obtaining resources at lower financial costs, and it aims at improving the commercial activities of these agents. In this way, informal financing, which increases poverty, is avoided. Also, in connection with this subject, surveys conducted among a thousand informal retailers in five Colombian cities—Bogotá, Cúcuta, Ibagué, Villavicencio and Arauca—were taken into account.