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Comparability is among the key qualitative characteristics of accounting information, which can be affected by various factors like management motivation and earnings management. On the other hand, ownership structure is a corporate governance mechanism that can affect different aspects of an enterprise. The purpose of this study is to investigate the moderating effect of ownership structure on the relation between accounting comparability and earnings management. The population of this research includes all listed companies on Tehran Stock Exchange. The sample consists of 120 listed manufacturing firms from the period 2005 to 2016. This research uses panel data and multivariate regression methods (with controlled effects of years and industries) for data analysis and hypothesis testing. The empirical results from testing the first hypothesis imply a significant negative relation between comparability and earnings management. The findings from testing the second hypothesis show that any increase of institutional ownership may cushion the negative impact of earnings management on financial statement comparability. The results from testing the third hypothesis cannot find any significant impact of ownership concentration on the relation between financial statement comparability and earnings management.

This study examines the relation between accounting conservatism and liquidity management. The sample consists of 76 firms listed in TSE in the period from 2005 to 2012. To test the hypothesis, regression coefficient analysis has been used. First, accounting conservatism has been measured by Gyvly and Hime model and then to measure the effects of accounting conservatism on cash and tendency to saving is measured by Kahal Batz et.al (2009) and Almeida et.al (2004) models respectively. Empirical evidence suggests that there is a significant relationship between conservatism and management of liquidity. Also between accounting conservatism and thetendency to saving there is a significant negative relation. The research results show of the more conservatism, the less cash available for firms.

ABSTRACT: in This paper, examine accrual quality of restating firms during the period 2001 – 2010.The sample include 70 restatement event for of listed companies in TSE and we compare accrual quality from before and after the restatement year. This firms have only once restatement in two years pre and post restatement year. Our measure for accrual quality is based on the Dechow and Dichev (2002) model. We find that the accrual quality increases significantly from the period of misstatement to the period following the restatement year. We also examine factors of associated with changes in accrual quality that is determinant of earnings quality including corporation governance ,Firm characteristics and audit quality. The results show that changes in size, change in sales, change in cash flows from operations, Leverage ratio, the ratio of market value to book value, the percentage ownership of institutional investors and CEO tenure are significant relationship with accrual quality.