외부감사인의 비감사서비스 동시 제공이 감사품질에 미치는 영향에 대한 문헌검토와 미래 연구방향의 제안

This study reviews prior literature on the effect of auditor-provided non-audit services on auditor independence, and thereby audit quality. Regulators started to pay attention to the incumbent auditor’s provision of non-audit services since the late 1990s as the size of non-audit services increased. They tried to prohibit the provision of non-audit services due to concerns on the potential detrimental effects on auditor independence. However, practitioners strongly opposed the regulatory attempts, arguing that the knowledge spillover from non-audit services to audit services helps auditors to understand the clients, and thus increases audit quality. To resolve this controversy, various studies have examined the effect of auditor-provided non-audit services on audit quality. This paper summarizes the findings in more than 100 studies related to this issue. In addition, this study discusses the strengths and weaknesses of the methodologies used in prior research and suggests ways to improve the research methodology. This study contributes not only to the academia but also to the practice by summarizing the findings in prior studies and providing a comprehensive picture on the issue. Regulators and other related parties can refer to this study for a better understanding of the issue.