Big 4 감사인의 감사품질이 부채조달비용에 미치는 효과 : 유가증권상장과 코스닥상장기업에 대한 실증적 증거
The effect of perceived audit quality of Big 4 auditors on the cost of debt : Some Empirical Evidence on KOSPI and KOSDAQ Listed Firms
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본 연구는 상장기업을 대상으로 Big 4 감사인의 선임이 부채조달비용에 미치는 영향을 분석하였다. 특히 본 연구는 유가증권상장기업(KOSPI)과 코스닥상장기업(KOSDAQ)을 비교하여 살펴보았다. 더 나아가 본 연구에서는 국내 상장기업에서 Big 4 감사인의 선임과 부채조달비용 간에 유의한 음(-)의 관계가 관찰된다면 이와 같은 관계가 채권자들에게 Big 4 감사인의 선임이 보증효과(insurance effect)에 따른 결과인지, 또는 정보효과(information effect)에 따른 결과인지, 아니면 두 가지 모두에 따른 총효과(=보증효과+정보효과)에 기인된 것인지를 Mansi et al.(2004)의 방법에 따라 살펴보았다. 이를 위하여, Big 4 감사인 여부는 선행연구의 방법에 따라 Big 4 회계법인과의 제휴여부로 측정하였고, 부채조달비용은 부채차입이자율 스프레드로 측정하였다. 분석기간은 2001년부터 2011년까지 금융업을 제외한 12월 결산법인으로 분석에 이용가능 했던 최종표본 10,479개 기업/연 자료를, 또한 KOSPI 표본은 5,036개 기업/연 자료이고, KOSDAQ 표본은 5,443개 기업/연 자료가 이용되었다. 본 연구의 실증결과에 따르면. 첫째, 전체 상장기업을 대상으로 한 경우 부채조달비용에 영향을 미치는 일정변수뿐만 아니라, 신용등급(또는 직교된 신용등급)까지 통제한 후에도 Big 4 감사인을 선임한 상장기업이 그렇지 않은 기업보다 1% 수준에서 유의하게 부채조달비용이 더 낮은 것으로 나타났다. 또한 Mansi et al.(2004)의 방법에 따라 Big 4 감사인의 선임 효과를 보증효과와 정보효과로 나누어 살펴본 결과, Big 4 감사인의 선임은 채권자에게 주로 보증효과에 기초해 부채조달비용이 낮은 것으로 나타났다. 이는 채권자들에게는 Big 4 감사인이 딥 포켓(deep pocket)이라는 것에 기초한 결과로 보인다. 둘째, 전체 상장기업을 다시 KOPSI와 KOSDAQ 표본으로 나누어 각각 분석한 결과에 따르면, KOSPI 표본에서는 Big 4 감사인의 선임과 부채조달비용 간에 유의한 음(-)의 관계가 관찰되지 않았다. 이와 달리 KOSDAQ 표본에서는 Big 4 감사인의 선임과 부채조달비용 간에 1% 수준에서 유의한 음(-)의 관계로 나타났다. 즉 앞서 전체 상장기업의 경우 Big 4 감사인과 부채조달비용 간에 유의한 음(-)의 관계와 Big 4 감사인의 선임이 보증효과를 제공한다는 결과는 주로 KOSPI 표본보다는 KOSDAQ 표본에 기인한 결과로 나타났다. 이상의 결과를 종합하면, 본 연구결과는 국내 채권시장의 채권자들은 KOSPI와 KOSDAQ 기업들에서 Big 4 감사인의 선임에 따른 인지된 감사품질 정보에 대해 차별적으로 반응하고 있다는 것을 실증적으로 보여주었다는데 의의가 있다. 또한 KOSDAQ에 속한 상장기업들이 부채차입을 통해 자금을 조달시 Big 4 감사인을 선임하면 채권자들에게 긍정적인 반응으로 나타나는 것은 주로 Big 4 감사인의 보증효과에 대한 인지(perception)에 기초한 것이라는 결과를 보여주었다. 이러한 결과는 KOSPI 보다 기업지배구조가 상대적으로 열악하고, 재무정보의 신뢰성이 낮은 KOSDAQ에 속한 상장기업에서 감사품질이 높은 외부감사인의 선임은 보다 중요한 외부지배구조의 역할을 수행할 것으로 채권자들이 평가한 결과일 수 있다. 따라서 본 연구결과는 학계의 관련연구에 추가적인 공헌을 할 뿐만 아니라, 감사품질에 관심이 있는 실무계 및 정책당국에게도 유익한 시사점을 제공해 줄 것으로 기대된다.
Abstract
This paper examines the effect of audit quality on cost of debt in listed firms. Specifically, this study investigates differences between KOSPI and KOSDAQ listed firms on associations between audit quality and cost of debt. Furthermore, this study tries to identify driving factors of audit quality using Mansi et al. (2004)’s methodology in determining whether the effect comes from insurance effect or information effect, or both. This approach may be differentiated our study from previous study, which only focus on audit quality. The effectiveness of the auditor that reduces information asymmetries is one of the function of audit quality. Prior research suggests that Big 4 auditors in the U.S. provide high quality audits to improve the firm’s brand reputation and to avoid costly litigation. Khurana and Raman (2004) shows that clients of Big 4 auditors have significantly lower ex ante cost of equity capital compared to clients of non-Big 4 auditors in the US but not in other Anglo-American countries. They argue that the perception of Big 4 performing higher quality audits than non-Big 4 is a function of the litigation environment. Their conclusion is that the threat of litigation is a stronger driver than reputation behind perceived audit quality, proxied by cost of capital. This conclusion implies that debt-holders primarily perceive audit quality in terms of the Big 4 auditor’s “deep pockets”. Also, Pitman and Fortin (2004) show that clients of Big 4 auditors have a lower cost of interest immediately after an IPO compared to clients of non-Big 4 auditors. In sum, it is general that big 4 auditors have the financial resources to better fulfill their monitoring, information and insurance roles than non-Big 4 auditors. In the context of this study this better fulfillment of these roles is expected to be reflected in a reduced cost of debt. In other words, to the extent that debt-holders perceive the Big 4 audit as providing a higher quality audits and more credible financial statement, firms audited by the Big 4 (relative to those audited by non-Big 4 auditors) are expected, ceteris paribus, to have a lower cost of debt. Specifically, we investigate whether Big 4 auditors are perceived as providing higher quality audits relative to non-Big 4 auditors in the debt market in Korea. To do this, we use 10,479 observations from 2001 to 2011 for 5,036 firm-year observations in KOSPI and for 5,443 firm-year observations in KOSDAQ. As a main variable, we measure Big4 audit firm dummy variable as proxy for audit quality. And we use the yield spread of interest rates as proxy for cost of debt. According to our analyses, we find that the first, firms audited by the Big 4 audit firm are more likely to associated with low cost of debt after controlling for control variables and corporate credit ratings. And we identify that when audit quality is divided into insurance and information effect using Mansi et al. (2004)’s methodology, this result comes from insurance effect rather than information effect. This implies that debt-holders consider Big 4 audit firm as deep pocket. The second, when we divide samples into KOSPI and KOSDAQ, the negative relationship between audit quality and cost of debt is not significant for KOSPI while the relationship is significant for KOSDAQ. This result demonstrates that the negative relationship between audit quality and cost of debt mainly comes from KOSDAQ listed firms. The finding implies that hiring Big 4 auditors in KOSDAQ listed firms is perceived as sound governance mechanism to debt-holders and improves credibility of financial reporting. The findings of this study provide important contributions in several ways. The first, unfortunately, the research about relationship between audit quality and cost of debt is rare in Korea. We believe that this work provides additional evidences about the effect of audit quality on cost of debt in Korea. The second, our study suggests that perception to insurance of Big 4 audit firms drives a negative relationship between audit quality and cost of debt in KOSDAQ. The findings of this study also suggest that Big 4 auditors provide high-quality audits, which improves financial reporting quality for KOSDAQ listed firms with poor governance compared to KOSPI listed firms. The third, this paper provides the evidence about driving factors of audit quality using Mansi et al. (2004) and find that a negative relationship between audit quality and cost of debt is mainly caused by insurance effect rather than information effect. This result is not consistent with Mansi et al. (2004)’s findings that audit quality comes from both insurance and information effect. This inconsistency provides implications to related study in Korea. Finally, the results present the empirical evidence to support that Big 4 auditor has an important role in alleviating information asymmetry between companies and external interested parties. This study suggests that debt-holders in Korea tend to differently react to Big 4 audit firm and perceived audit quality. In sum, the results of this paper indicate that a differential audit demand still exists in listed firms, and a audit quality significantly influences a level of cost of debt for KOSDAQ listed firms. Based on these results, we can better understand about the decision on auditor selection of listed firms in Korea. The findings in this study have various implications. This result implies that debt-holders in debt market perceive the firm audited from Big 4 auditor more favorable. Specifically, we show that the effect of audit quality attributes on cost of debt of client firms is limited to KOSDAQ listed firms. This suggests that the debt market in Korea perceives audit quality to be more important for smaller listed firms than for bigger ones. Therefore, these findings are very useful and provide a lot of important implications to academic as well as practitioner, investors, creditors, and regulators that are interested in the effect of audit quality in listed firms. Academics can also apply the discussion in this paper for related researches.
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