The main objective of the study is to identify the factors affecting the capital adequacy ratio in Vietnamese commercial banks. The author set up multivariate linear regression model with panel data collected from 29 commercial banks in the period of 2013-2017. The model consists of 7 independent variables: bank size, return on assets, net interest margin, equity ratio, loans on assets, loans loss reserves and non-performing loans. The estimation results show that bank size and equity ratio is

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... ositive significantly to capital adequacy ratio, while return on assets and loans loss reserves is inversely proportional to capital adequacy ratio. This study has not found evidence of the impact of net interest margin, loans on assets and non-performing loans to dependent variable.