在全球反避稅的趨勢下，企業從事避稅行為之風險亦隨之提高，為了避免引起稅務機關的質疑及影響投資人之觀感，企業會選擇向外界隱藏其行為，而過去研究表明當管理階層有欲掩蓋之行為時會出具可讀性低的財務報表，因此本研究旨在探討企業避稅程度與財務報表可讀性之關聯性，並進一步檢測，產業專精之會計師事務所是否有助於減緩避稅程度與財務報表可讀性間的負向關聯。台灣上市櫃公司於2013年全面採用IFRS編製財務報表，故本研究以台灣2013年至2018年之上市櫃公司為研究樣本。實證結果發現，避稅程度愈高之企業會傾向編製可讀性較低的財務報表，使外界無法察覺企業的實質避稅行為。此外，產業專精之會計師事務所有助於提升受查客戶之財務報表品質及強化其資訊揭露的透明度，並抑制企業操弄財務報表資訊的行為，因此反而會促使避稅程度愈高之企業，出具更具可讀性的財務報表。

As the global trends in anti-tax avoidance, firms that engage in tax avoidance activities have an incentive to obfuscate information in order to reduce the likelihood of being challenged by tax authorities and investors. Previous research shows that when a management wants to hide something, the firm’s financial statement becomes less readable. Therefore, this study aims to investigate the relationship between corporate tax avoidance and financial statement readability. In addition, I examine whether the audit firm industry specialization mitigate the negative association between tax avoidance and financial statement readability. Since publicly-traded firms in Taiwan have full adoption of IFRS in 2013, the research sample is publicly-traded firms in Taiwan from 2013 to 2018. The result shows that firms with high level of tax avoidance issue less readable financial statements in order to avoid revealing information and that would make them more difficult to interpret for outsiders. Furthermore, it also indicates that firms with audit firm industry specialization have greater financial reporting quality and information transparency and that would make firms with high level of tax avoidance to enhance their financial statement readability.

第一章 緒論 1
第一節 研究背景與目的 1
第二節 研究架構 5
第二章 文獻回顧 7
第一節 避稅行為 7
第二節 財務報表可讀性 15
第三節 會計師事務所產業專精 22
第三章 假說發展與研究設計 25
第一節 假說發展 25
第二節 實證模型與變數定義 29
第三節 資料來源與樣本篩選 37
第四章 實證結果分析 41
第一節 敘述性統計 41
第二節 相關係數分析 45
第三節 實證結果 49
第四節 額外測試 55
第五章 結論與建議 71
第一節 研究結論 71
第二節 研究限制與未來研究建議 72
參考文獻 75

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