Audit fees are one of the controversial challenges of the audit profession which, on one hand, can lead to the auditor's economic dependence on the unit reviewed (non-independence) and, on the other hand, lead to a deterioration in the quality of the audit. Hence, several studies have been conducted to provide a clear pattern for determining the appropriate audit fees; however, so far, not any research has not been done using this dynamic data (GMM). In this regard, the subject of the present study is to study the relationship between audit fees and the financial indices and elements with applying the GMM method to companies listed to Tehran Stock Exchange. To estimate the research model, the financial information of 106 companies in Tehran Stock Exchange during the seven-year period in 2010-2016 was evaluated using the generalized method of moments (GMM). Excel, Eviews and Minitab software have been used to analyze the results of the research. Findings of the research indicate a direct and significant relationship between audit fees of the current year and audit fees of the last year, sales of the current year and the size of the company.
