The Relationship between Tax Avoidance and Firm Value with an Emphasis on Agency Cost and Firm Disclosure Quality

The aim of this study is to investigate the relationship between tax avoidance and firm value with an emphasis on agency cost and disclosure quality of firms listed in Tehran Stock Exchange. The sample of this study consists of 68 firms for the period 2004 to 2015.This study is applied in purpose and correlation- descriptive in method. In this study to test the hypotheses, multivariate linear regression model is used. To test the models, the Chaw test was firstly used and it was indicated that Panel method should be applied. Then, Hausman test was applied for incorporating Panel method’s random effects or proof effects. The results indicate that regardless of agency costs and quality of disclosure, there is no significant relationship between tax avoidance and firm value. On the other hand, tax avoidance has no significant impact on agency costs. Also the results of this study indicate that the firm’s disclosure quality has significant effect on the relationship between tax avoidance and firm value.