In emerging economies, low-income populations migrate to entrepreneurship as a way of overcoming obstacles, such as the lack of formal employment, or even out of the need for independence. Entrepreneurship is considered a vector of prosperity and development in these economies. The creation of small businesses, including self-employment, is therefore highlighted. It is considered that the human capital, as well as the individual skills of these entrepreneurs, are important for the survival of the business. However, the lack of these skills is evident, along with the lack of structure, informality, and lack of training, which is a problem for the development of these businesses. Thus, management training programs can be an essential factor in improving the skills of these entrepreneurs, contributing to the performance of the business. Within the Brazilian context, a major national supporter for the development of small businesses is Sebrae, for example, the TOP Entrepreneur training program, which is offered to formalized microentrepreneurs from low-income communities in Rio de Janeiro. In view of this, this study sought to evaluate the impact of the program through T-tests and linear regressions for 55 and 46 microentrepreneurs in 2020 and 2021, respectively. The results suggest that the training is more beneficial for entrepreneurs with less prior knowledge, that aspects related to motivation impact their business practices, but that it is not possible to confirm the impact of business practices on performance, although an increase in performance was detected before and after the training.