The different economic activities as an alternative to enhance the development of the country, motivated the present research work, which has as main objective, to analyze the relationship between the economic activity measured by the Index of Economic Activity (IDEAC), and the delinquency of private banks in Ecuador 2013 - 2019, applying an econometric model of ordinary least squares, with data obtained from the Central Bank of Ecuador and the Superintendence of Banks. The results of the study show the existing relationship between the study variables, also shows a close relationship with GDP. When the IDEAC and GDP decrease, the delinquency rate of large private banks increases by 7.64% quarterly. On the other hand, an increase in the IDEAC decreases the delinquency of large private banks by -0.02%.