M.A. Thesis:

Financial and operational characteristics, corporate governance and the effective tax rate

Effective tax rate is one of the most important financial and tax indicator that is so affective in tax justice. This research is looking up to check the connection between Financial and operational characteristics, corporate governance and the effective tax rate. Some the key trait including firm size, financial leverage, profitable, mount of investment, inventory amount, search and development expenditure, ownership structure, board size, and the number of non-executive directors in board have been checked. Total companies surveyed in this research are accepted companies in Tehran's stock exchanges between the years 2012 till 2016 that after considering limits sample number turned to 116. Research result showed us that between the company size, profitable, inventory amount, search and development costs, board size and the number of non-executive directors with effective tax rate have a positive and significant relationship. But there was a negative and significant relationship between ownership structure and effective tax rate. Also, no significant relationship was found between the financial leverage and the effective tax rate.

Keywords: Key words: effective tax rate, firm size, research and development expenditure, investment intensity