In 2010, Taiwan made a big change in her tax environment. The government releases the Industrial Innovation Act and cuts the corporate tax rate. Enterprises face a whole new tax environment. It is no doubt that this tax reform is the most influential institutional change in Taiwan in recent years. This tax reform expands the gap between corporate tax rate and personal tax rate. It may induce the motivation to avoid the tax for the blockholders by not paying dividends. Hence, it is necessary to investigate whether the tax environment change impacts firms' dividend policy. The results of this study will increase the understandings about the effectiveness of this tax reform and supplement the literature regarding the relationship between tax and corporate dividend policy. The empirical results of this study show that after the change of the tax environment, the company's total dividend payout rate decreased. Companies with a lower blockholder ratio are more significant.