This study investigates the explanatory power of leverage and cash flows in future cash flow prediction in Tehran Stock Exchange by considering Signaling Theory and Pecking Order Theory. Based on theoretical foundations, the regression models of leverage and cash flow with a set of control variables was developed. Statistical samples consist of companies listed in Tehran Stock Exchange over the period 2005- 2011. The results show that there was a negative relationship between cash flow and leverage levels in contemporary time. This is consistent with pecking order behavior. While at intertemporer level, there was a positive relationship between current leverage and the firm & apos; s cash flows in the future. This is consistent with signaling theory.