The Effect of Debt Structure on Conditional Conservatism of Listed Companies in Tehran Stock Exchange

The aim of this research is the study of the debt structure effect on conditional conservatism of listed companies in Tehran Stock Exchange. For the measurement of debt structure we used debt to assets ratio and long–term debt to total debt ratio and conditional conservatism is measured using Basu’s (1997) asymmetric timeliness and persistence earnings measures and Ball & Shivakumar’s (2005) asymmetric cash flow-accruals measure. To test hypothesis of this research، 81 listed companies of Tehran stock Exchange were Tested with pooled multivariate regression models from 2002 to 2008. The results of research show that based on the first hypothesis، debt to assets ratio on conditional conservatism has positive impact in model of earning-return، neutral impact in model of earning changes and negative impact in model of accrual-cash flow operating. Also، findings of research about second hypothesis indicate that the ratio of long-term debt to total debts (in three models) did not have impact on conditional conservatism which is indicative of neutral impact of feature of debt maturity on conditional conservatism.