studying the effect of corporation’s disclosure quality rank on income-smoothing and informativeness of tehran stock exchange’s listed companies

The study is to review the disclosure quality rank on incomesmoothing and informativeness by means of four hypotheses. the timescale is between 2010 and 2016, and 149 tse’s listed companies are studied. the first hypothesis examines the effect of higher disclosure quality rank on income informativeness. the result confirms that higher rank of disclosure quality improves income informativeness. the second hypothesis reviews the relationship between disclosure quality rank and income smoothing. the findings of this hypothesis indicate lower disclosure quality will increase income smoothing behavior. in the third hypothesis, the effect of income smoothing on informativeness is examined, which results in a statistical view that income smoothing has a sensible positive effect on informativeness. finally, the effect of higher rank of disclosure quality on the informativeness of the smoothing listed companies in the fourth hypothesis. the findings indicate that income smoothing has a meaningful effect in strong disclosure quality companies.