IFRS 도입 전후 감사인 교체와 이익조정에 관한 연구 = A Study on the Auditor Changes and Earnings Management under Pre- and Post-IFRS

다국어 초록 (Multilingual Abstract)

This paper examines whether the relation between auditor switch and earnings management in Korea has changed after the mandatory adoption of IFRS (i.e., the post-IFRS period) compared to before the IFRS adoption period (i.e., the pre-IFRS period), and whether the direction of the auditor switch (i.e., from or to the Big 4 auditors) has affected those changes. Previous literature documents that before the adoption of the IFRS (i.e., during the K-GAAP period) the discretionary accruals increase in the year that a firm changes its auditor (Park and Kwak 2007) compared to a firm that keeps its auditor. Other studies report that the discretionary accrual level in general has decreased in Korea after the IFRS adoption (Park et al. 2013; Kim 2014; Chung and Kim 2014; Jeon et al. 2014). However, no study has yet attempted to find evidence regarding the influence of the IFRS adoption on the relation between auditor switch and earnings management. To fill this gap, we investigate this issue with all listed firms excluding those in the finance industry over the 4-year period before and after the IFRS adoption between 2007 and 2014 (equivalent to 10,902 firm-year observations). Among total sample, 1992 firm-year observations that change auditors are defined as the auditor-change firms while the remaining 8,910 observations that do not change auditors are defined as the auditor-retention firms. Also, among the auditor-change firms, 787 observations change the auditors in the pre-IFRS period and the rest (1,205 observations) switch in the post-IFRS period. A firm’s earnings management activity is estimated by discretionary accruals in the main analysis and by real activity (i.e., RM) in the additional analysis. Major findings of this study are as follows. Firstly, we do not observe a significant increase in discretionary accruals in auditor-change firms compared to those without an auditor switch (i.e., auditor-retention firms) over the whole period from 2007 to 2014 (10,902 observations), which is inconsistent to the results in Park and Kwak (2007) who use the pre-IFRS period only (2000-2005). However, when we split the sample period into the pre-IFRS period (2007-2010) and the post-IFRS period (2011-2014), we find that auditor-change firms report greater discretionary accruals than auditor-retention firms in the post-IFRS period than in the pre-IFRS period. Secondly, among the auditor-change firms, those changing from the Big 4 auditors to the non-Big 4 auditors show higher level of discretionary accruals than those switching in reverse regardless of the period. Lastly, additional test reveals that auditor-change firms are more likely to have lower level of earnings management through real activity (i.e., RM) compared to auditor-retention firms throughout the whole sample period. However, we do not observe any evidence on a significant difference in the RM level of auditor-change firms and that of auditor-retention firms between the pre-IFRS period and the post-IFRS period. This result implies that to increasing the reported earnings, the auditor-change firms tend to resort to discretionary accruals rather than to RM in the year of the auditor switch compared to the auditor-retention firms.

참고문헌 (Reference)

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