本研究旨在探討課稅所得與財務所得之相對資訊內涵及增額資訊內涵。為進一步檢視資訊內涵的來源,本研究期間涵蓋1992年到2012年共計21個年度,選取高度盈餘管理向上(向下)公司與其他公司進行比較,逐年檢視其課稅所得之相對資訊及增額資訊內涵之影響程度,並採用樣本平均數檢定及無母數統計檢定檢視其結果。 實證研究結果發現,(1)高度盈餘管理向上公司相較於其他公司,其課稅所得之相對資訊內涵都明顯大於財務所得;(2)不管是高度盈餘管理向上的公司或高度盈餘管理向下的公司,其課稅所得皆具有增額資訊內涵,也就是擁有兩種所得的資訊內涵大於只擁有一其中一種。
This study examined the effect of the relative and incremental information content of the estimated taxable income to book income. Two groups of firm (high earning management companies and others) are identified annually from all Taiwan listed companies for the past 21 years from 1992 to 2012. The information contents of the estimated table income are investigated annually first; then the independent two sample t test and Wilcoxon rank sum test are used to compare the mean and median difference between two groups of firm. The empirical results have shown that (1) the relative information content of the estimated taxable income to book income for firms with high upward earning management behavior is significantly larger than that of other firms; (2) the estimated taxable incomes have incremental information content in addition to book income, for firms with high upward and downward earning management behavior.