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This study investigates how insiders and outsiders affect the earnings management of CEOs by conducting a comparative analysis of insiders, trust banks, outsiders, and global investors. Interestingly, the holding shares of insiders and outsiders have opposite effects on CEOs’ opportunistic accounting behaviours.

The International Accounting Standards Board (IASB) will discuss whether or not accounting rules for M&A change, and it plans to draw a conclusion in 2021. In view of this fact, it is considered that a series of large M&A have significant effects on corporate earnings worldwide. This paper examines whether the amortization and/or non-amortization of goodwill affect companies’ earnings and future cash flow, an analysis for which there are two reasons. First, IFRS initiates the debate on the premise of goodwill amortization. If goodwill is amortized, it will have a profound impact on corporate profits and cash flow. Second, M&A has recently increased in Japan due to the increase in retained earnings and because IFRS has not requested goodwill amortization. The conclusion is as follows: First, it has become clear that legally retained earnings accelerate M&A because they affect the future goodwill along with both accounting standards. Next, the results revealed that the amortization of goodwill corresponds with the future ROA in conformity with Japanese accounting standards. On the other hand, this study did not determine that goodwill affects ROA in IFRS companies. Particularly, IFRS firms invested greater amounts of money than did Japanese accounting firms. Therefore, IFRS firms' goodwill might not be effective applied to M&A within four years.