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本研究主要在探討近年來兩大租稅改革：兩稅合一制及最低稅負制之施行對上市公司外資持股比率之影響，是否降低外資持有我國上市公司股票之意願，影響我國企業的股權結構。 兩稅合一制施行後，消除股利所得之重複課稅，國內法人股東與自然人實質稅負減輕；但根據所得稅法第七十三條之二規定，非中華民國境內居住之個人、在中華民國境內無固定營業場所及營業代理人之營利事業，其獲配股利所含之稅額，不得扣抵其應納稅額，外資無法享受股東可扣抵稅額消除重複課稅的好處，外資在台投資實質總稅負仍維持為40%，較境內自然人股東之實質稅率6%~40%為高，股東可扣抵稅額比例愈高，外資損失越大。再者，最低稅負制施行主要影響對象為外資持股最多的電子業，且最低稅負制之施行對於公司補繳之稅負，外資股東也無法享受股利抵稅權。故可推論兩稅合一制、最低稅負制之施行及股東可扣抵稅額與上市公司外資持股比率應呈負向關係。 本研究之樣本為民國85年到民國95年及最低稅負制前、後之台灣上市公司。主要實證結果彙整如下： 1、兩稅合一制之施行及股東可扣抵稅額與上市公司外資持股比率呈負向關係，最低稅負制之施行與上市公司外資持股比率呈正向關係，但其效果應為股價指數之影響所致而非最低稅負制之施行；又最低稅負制施行後，外資仍偏好持有公司有效稅率低於10%之股票。 2、另外以民國93年到民國95年資料額外檢測，最低稅負制下限制投資抵減金額之效用，推論投資抵減金額在最低稅負制施行後與上市公司外資持股比率應呈負向關係，實證結果為負向關係但不顯著。 / The objective of this study is to examine whether the implementation of the Imputation Tax System and Alternative Minimum Tax System will affect the willing of foreign investors to invest in listed companies. The sample of this study consists of firms listed in the Taiwan Stock Exchange from 1996 through 2006. The empirical results in this research are summarized as follows: 1、 The implementation of the Imputation Tax System and a firms' imputation tax credit ratios have a negative impact on the percentage of foreign ownership in listed companies, but the implementation of Alternative Minimum Tax System has a positive impact on that. We conduct further examination and find the increasing effect of the percentage of foreign ownership is more rely on the effect of stock index than that of the implementation of Alternative Minimum Tax System. Further, foreign investors still prefer to invest in listed companies whose effect rates are lower than 10%. 2、With the implementation of Alternative Minimum Tax System, the use of investment tax credit was restricted. The empirical result of this study shows that after the implementation of Alternative Minimum Tax System, the investment tax credit has a negative but not significant impact on the percentage of foreign ownership in listed companies.