This chapter focuses on analyzing the effects of aging on corporate tax rates. As seen in Chaps. 2 and 3, population aging increases Japan’s social welfare spending per capita through political processes; on the other hand, it decreases the per capita spending on other areas that result in long-term benefits, such as infrastructure and education in Japan. Subsequently, another question is how aging affects corporate activities that support local economic growth and employment. In this chapter, we analyze those problems focusing on statutory corporate tax rates.