The aim of this study was to analyze the impact of interaction between external communication, internal information processing and internal logistics in the financial control of Brazilian Micro and Small Enterprises. It was characterized as a survey with a quantitative approach, and the applied statistics consist of confirmatory factor analysis and structural equation models, based on a sample of 183 companies. Considering a significance smaller that 0.05, the main results have presented that internal information processing and internal logistics showed a positive and significant relationship with financial control. Internal logistics and external communication also proved to be positively and significantly correlated.