Purpose of the Study: Tax avoidance means the use of gaps in tax laws for non-payment or late payment of taxes for companies, which is affected by different factors. The present study investigates the impact of diversification on tax avoidance in companies. To this end, the financial information of 384 firms during the period of 2011- 2016 in the Tehran Stock Exchange was examined. Methodology: In this research, the required financial information was summarized, classified, and calculated in Excel software and the data were analyzed by using E-views software. The dependent variables were effective tax rate and book-tax difference, while the independent variable was corporate diversification, which shows how to divide the market between business sectors (units) in a company. Control variables include size, financial leverage, company’s loss-making, ROA, capital expenditures, R&D, market to book value, CEO ownership, and management of ownership. Conclusions/Results: The findings obtained from this study demonstrate that at a 95% confidence level, there is no significant relationship between diversification and effective tax rates in companies listed in the Tehran Stock Exchange. However, at a 90% confidence level, diversification reduces the effective tax rate. Furthermore, no reliable evidence was found regarding the effect of diversification on book-tax difference at a 95% confidence level. Novelty: Tax is a charge imposed by the government on all organizational profits. Various enterprises have complex operations due to their institutional structure, which makes it possible to increase tax avoidance in these companies. The production or sale of a variety of products (diversification) is bigger and has more complex organizational structures that increase the cost of management and non-management decisions, making it difficult for companies to coordinate their policies. Thematic classification: G10, M41
Purpose: Auditing will improve the quality of financial information. However, in today's audit quality affected by the environment. The purpose of this study to investigate the effect of business strategy and internal control on audit quality in listed companies in the Tehran Stock Exchange. Methodology: This is applied research in terms of its purpose and in terms of its method is correlation analysis with the regression approach. For this inference method, this research is descriptive-analytic. For this important statistical society, companies listed in the Tehran Stock Exchange during the years 2010-2017 for 8 years have the necessary conditions. According to the constraints defined in the research, companies with qualifying conditions of 107 companies and 856 years-company of observation were collected. To test the hypotheses, the multivariate regression technique was used using panel data. Main Findings: The business strategy modifies the relationship between the auditor's specialty in the industry and the internal control of audit quality. Implications: The control structure can provide an understanding of the difference between the business strategy and its diversion, which is necessary for the auditor's expertise in the industry. It is proposed to combine business strategy and audit planning, we can identify the weakness of the internal control of the system in order to improve the quality of the audit and create value for the stakeholders. Novelty: The study considered the effects of business strategy on the relationship between internal control and audit quality.
The present study aims to investigate the impact of non-audit services on earnings response coefficient. It is a library and analytical-scientific research and is based on panel data analysis. In this study, the financial data of 74 companies accepted in Tehran Stock Exchange during the period 2011-2016 have been reviewed.The results demonstrate that non-audit services have a significant negative relationship with earnings response coefficient.Although non-audit services will have benefits such as increased financial statements understandability, auditors’ knowledge-sharing, better relationships between managers and auditors and reduced agency costs, this type of services threatens auditor independence and subsequently, earnings quality will be affected. Thus,the findings of the present study confirm the view thatby providing non-audit services, auditor independence is affected, resulting in a negative reaction to earnings.
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