本研究以2001年至2005年為研究期間，從股權結構及董事會監督功能分別探討公股角色對投資標的公司經營績效之影響。本文之研究結果顯示：(1)股權結構變數中，公股投資標的公司之經營績效較無公股投資之公司為佳。(2)公股持股比率愈高，公股投資標的公司之經營績效則愈差。(3)董事會組成變數中，由公股代表出任董監之公股投資標的公司之經營績效較未派任公股代表之公司為佳。(4)當公股代表的席次比率愈高時，公股之投資標的公司之經營績效愈差。(5)公股持股比率偏離公股代表席次比率之程度愈高，公股投資標的公司之經營績效愈差。 / This research from 2001 to 2005 as research period, aim to explore the role of government ownership in the relationship between board composition and firm performance in the enterprises with government ownership. The empirical results document that from ownership structure variables, the effect of government shareholding on firm performance is found to be positive. Furthermore, firm performance decreases with an increased size of government shareholding. From board composition variables, the effect of the board with the government shareholding represents on firm performance is found to be positive. Furthermore, firm performance is worse with an increased size of government shareholding represents in the corporate board composition. Finally, when the government shareholding and the government shareholding represents’ seat ratio deviation degree is bigger, the firm performance would be worse.

本論文主要目的係探討政府持股與企業避稅間之關係。本文以2005年至2014年台灣公開發行以上公司為樣本，分析政府持股比例、代表政府董監事席次比例對租稅規避的影響，並檢視公股主導企業之避稅程度。 實證結果顯示，政府持股比例對企業避稅無顯著影響，然而，當代表政府的董監事席次比例愈高，企業會減少避稅行為。此外，研究結果亦指出公股主導之企業相對於家族企業，其避稅程度較低。進一步分析公股主導之企業和雙權偏離互動對企業避稅之影響。實證分析發現，當股份盈餘偏離程度愈大，公股主導之企業相對於家族企業，其避稅程度較高，隱含公股主導之企業會透過避稅行為將財富移轉至企業本身；反之，當席次盈餘偏離程度愈大，公股主導之企業相對於家族企業，其避稅程度較低，表示政府掌握董事會席次時，能有效監督企業遵循稅法規定，採用較保守的租稅政策。 / The purpose of this study is to examine the association between government shareholding and tax avoidance. This study uses the data of Taiwan public companies from 2005 to 2014 to analyze whether government shareholding percentage and the ratio of directors held by the government have impact on tax avoidance, and investigate the level of tax avoidance of government-controlled companies. The empirical results reveal that government shareholding does not significantly affect corporate tax avoidance. However, when the ratio of directors held by the government increases, companies would reduce the level of tax avoidance. In addition, the results also indicate that government-controlled companies are less tax avoidance compared with family-controlled companies. This study conducts further analysis on the influence of the interaction of government-controlled companies and the deviation between control rights and cash flow rights on tax avoidance. The results show that the higher the level of the deviation between voting rights and cash flow rights, the higher the level of tax avoidance of government-controlled companies than family-controlled companies. It implies that government-controlled companies might transfer fund to themselves through tax avoidance. On the contrary, when the deviation between the ratio of controlled board seats and cash flow rights increases, the government-controlled companies engage in less tax avoidance than family-controlled companies. It represents that when the board of directors is controlled by the government, it could effectively supervise the company to comply with tax regulations, and the company would adopt conservative tax strategies.