研發、稅負和外人投資三者都是企業經營發展重要的因素。一方面,公司藉由研發活動保持成長性,持續成長後,獲利增加,自然會吸引外人投資。另一方面,所得稅負擔不但會影響公司投入研發的強度,也會影響外資的持股意願。本研究目的在探討研究發展、所得稅及外資持股間是否存在內生相互影響關係,研究期間為2005年至2008年。實證結果,研究發展、所得稅與外資持股三者間存在內生相互影響,除研究發展對外資持股之影響不顯著外,所得稅費用對外資持股比率有正面影響;研究發展費用率愈強之公司,可以抵減之所得稅愈多;而外資持股比率對研究發展費用率有正面影響,即外資持股愈高之公司,研究發展強度愈強;所得稅費用愈高之公司,對於研究發展費用會減少,三者間存在相互影響之內生關係。
R&D expenditure, tax payment and foreign investment are the important factors for corporations to pursue the long term growth. Firms obtain the productivity and competitive abilities by R&D activities which will not only raise the profits but attract foreign investors to hold shares. Moreover, firms’ tax payments will affect the incentives to involve R&D activities, and so do the incentives of foreign investors to hold shares. The objective of this study is to examine if R&D expenditure, tax payment and foreign shareholdings are endogenously determined by using the simultaneous equation model. The main results include: (1) High tax payments will invite the foreign shareholdings. (2)R&D expenditure, tax payment and foreign shareholdings influences each other endogenously. (3) The more the R&D expenditures, the higher the deductions of tax payments are. (4) Foreign shareholdings are significantly positive to R&D expenditures. The more the foreign shareholdings, the higher the incentives of R&D activities are. (5) High tax payments will discourage R&D expenditures.