This study was about the impact of corporate social responsibility on company's economic sustainability. References for this study were drawn from NBCL-Mwanza staffs and its customers. The study sought to meet five objectives, namely; to examine the relationship between and company's economic sustainability in Tanzania, to assess the relationship between accountability and company's economic sustainability in Tanzania, is there a relationship between company's compliance and company's economic sustainability in Tanzania, resource management has anything to do with company's economic sustainability, What is the economic sustainability of NBCL in Tanzania. The study employed mixed method approach where quantitative and qualitative was both used descriptive cross-sectional research design. Data were collected from participants who were NBCL-Mwanza staffs and its customers. Data and information was gathered using questionnaire, interview guides and documentary review. The analysis of the data obtained from the respondents revealed that corporate social responsibility has contributed to the economic sustainability of NBCL-Mwanza. However, the test results revealed that NBCL-Mwanza economic sustainability is influenced by corporate reporting but the company has inadequate knowledge on corporate social responsibility reporting while the government has shown inadequate support on promoting and supporting companies that engages in corporate social responsibilities practices . This failure is said to be the result of transition period that every part concerning with corporate social responsibility should adopt and learn to integrate corporate social responsibility practices as an economic sustainability strategy of their own. In addition, the results revealed that corporate social responsibility is a new strategy to company‟s staffs and managers, they should be taught in how to make the best use of corporate social responsibility in enhancing company's economic sustainability.