我國上市櫃公司於2013年開始強制採用IFRS編製財務報表，本研究以2011年至2014年之我國上市櫃公司為研究樣本，將研究期間劃分為強制採用IFRS前(2011-2012年)與強制採用IFRS後(2013-2014年)兩期作比較，探討強制採用IFRS對盈餘管理是否有顯著影響。我們依循Barth et al. (2008)與Daniel et al. (2012)之作法，運用三項盈餘平穩化衡量指標，來對盈餘管理程度加以衡量。三項盈餘平穩化衡量指標之實證結果為：(1)以盈餘變動數之變異性為衡量指標，發現盈餘變動數之變異性在強制採用IFRS後顯著較小；(2)以盈餘變動數之變異性除以來自營業活動之現金流量之變異性的比率為衡量指標，發現這個比率在強制採用IFRS後較小；以及(3)以應計數及來自營業活動之現金流量取Spearman相關係數為衡量指標，發現在強制採用IFRS後，負相關程度提高。三項衡量方式之實證結果皆支持在強制採用IFRS後，公司盈餘管理程度有顯著提升。

Since 2013, all public companies in Taiwan have been required to publish their consolidated financial statements in accordance with International Financial Reporting Standards (IFRS). This paper address the question whether the mandatory adoption of IFRS is associated with the significant effect on earnings management. Our analysis is based on data from 2011 to 2014 for companies listed in Taiwan. We compare characteristics of accounting numbers in the pre-mandatory IFRS adoption period (2011-2012) and the post-mandatory IFRS adoption period (2013-2014). Following Barth et al. (2008) and Daniel et al. (2012), we use three earnings smoothing metrics to measure the extent of earnings management. Our findings of the three proxies for earnings smoothing can be summarized as follows: First, our earnings smoothing metric is the variability of the change in net income and we find that the variability of change in net income decreases significantly in the post-IFRS adoption period. Second, our earnings smoothing metric is the ration of the variability of the change in net income to the variability of the change in operating cash flow and we find that the ratio of net income variability to operating cash flow variability is lower in the post-adoption period than in the pre-adoption period. Third, our earnings smoothing metric is the Spearman correlation between accruals and operating cash flow and we find that the correlation between accruals and operating cash flow in the post-adoption period is significantly more negative than in the pre-adoption period. Overall, these findings support that firms engage in more earnings management after the mandatory adoption of IFRS.

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