비감사서비스의 반복성과 다양성이 감사인의 독립성에 미치는 영향

Prior Studies focusing on the relationship between non-audit services and auditor's independence have been debating whether these services impair auditor's independence. And Recently IFAS has revised Auditor Ethics Code including regulation of auditor providing specific Non-audit services, So range of non-audit services that auditor may serve his/her client can be narrow. Therefore, it is proper timeliness to evaluate the effects of non-audit service on auditor's independence in order to implement new rule regarding these services. The purpose of this research is to investigate the relation between non-audit services and auditor's independence, with behavioral perspectives; recurring and diverse non-audit services. Generally speaking, recurrence and diversity can be related to learning effect. So, in this study recurrence is defined as years that client purchased non-audit service from identical auditor and diversity as number of non-audit service type that client purchase in a fiscal year from same auditor. Our Hypotheses developed from prior papers are as follows; Clients can purchase recurrently non-audit service and diversely non-audit services. Because These behaviors can generate knowledge spillover effects among audit and non-audit services, Auditor gets widely understandings and deeply knowledge about client. Client and auditors strengthen the economic bonding accordance with reducing their costs of service provided or purchased. Thus, this mechanism results to impair auditor's independence(Beck et al. 1988, Parkash and Venable 1993, Jeffrey and Valencia 2009). Methodologies of this study is OLS regression of recurrence and diversity of non-audit services on performance-matched discretionary accruals that stand proxy for auditor's independence, using 1,703firm-year of FY2004-2008, public firms of KSE through systematic sampling procedures. Results of this paper are follows. First, there is a statistically significant positive relation between recurrence and discretionary accruals, So we can estimate that auditor's independence impair in the case of recurrently purchasing(or providing) these services Second, there is also a statistically significant positive relation between diversity and discretionary accruals, Thus we find that impairment of auditor's independence can be caused by behavior of purchase(or provided) a variety of non-audit services. Therefore, our results support prior papers hypotheses, mechanism of impairing auditor's independence that knowledge spillover causes economic bonding. The contribution of this paper is to suggest that in preparing to regulate non-audit services, FSS and KICPA should not only consider specific non-audit service types but also behavior perspective in order to maintain proper level of auditor's independence.