One of the most important financial issues of a company is always to identify and manage the factors affecting the company's performance. Hence, many researchers have conducted researches in this regard. This research seeks to test the impact of commercial credit and bank loans on the performance of companies. Hence, the Tobin's Q ratio is used as a combined (covering economic value and accounting) criterion. In this research, the data from the stock exchange have been used and the sample includes 134 companies from 2002 to 2014. The method used to estimate the regression model is the generalized method of moments. The research results show that commercial credit has a direct and meaningful effect on corporate performance, while bank loans have a reverse and significant effect on corporate performance.