Integration of the Individual and Corporate Tax Systems in Japan

1.综合企业所得税(CBIT)原型具有日本一体化制度的三个优点。(1)通过对应税和免税投资者的共同规则，实现税收中性。在这一点上，CBIT优于传统的方法--I。股东分配、归责信用、股利扣除原型。(2)具有很强的符号性。因为CBIT类型将实体层面的利息和股权收入置于等于最高个人税率的单一水平的日本税收中，而不是投资者的实际边际税率。由于日本金融体系的交叉共享性和主要银行性质，这对我国的金融一体化体系具有重要意义。(3)对具有应税能力的税目投资者征税。这一点很重要，因为税务实体，如养老基金，将在不久的将来增加投资。CBIT有三个缺点。(1)如果不在投资者层面取消利息所得税，就不可能实现中性税制。作为一种可行的替代方案，我们提出了改进的CBIT(ACBIT)，它继续在投资者层面征收利息所得税，在实体层面扣除利息。(2)CBIT将利息和股权收入置于最高个人所得税率是不公平的。(3)CBIT导致在国际环境中接受来源原则。因此，我们需要进一步研究的是：(1)在考虑税收公平的情况下，CBIT和ACBIT的最优税率是多少；(2)在国际上，CBIT、ACBIT和传统方法哪个最好？

1. Comprehensive business income tax (CBIT) prototype has three merits as Japanese integration system. (1) It can attain the neutrality of taxation by common rule to taxable and tax-exempt investors. In this point CBIT is superior to the traditional methods-i. e, shareholder allocation, imputation credit, dividend deduction prototype. (2) It is very symple system. Because the CBIT type subjects interest and equty income at the entity level, to a single level of Japanese tax equal to the top individual rate, regadless of the investor's actual marginal tax rate. It is significant for our integration system because of cross sharing and main bank in Japanese financial system. (3) It taxs the tax-exemt investors' with taxable capacity. This is important because the tax-exemt entity, like pension funds, will increase their investments in the near future.2. CBIT has three demerits. (1) If we don't abolish interest income tax at investors' level, we can't get the neutral tax system. As a feasible alternative We propose ammended CBIT (ACBIT) which continue interest income tax at investors' level and deduction for interest at entity level. (2) It is not fair that CBIT subjects interest and equty income to the top individual rate. (3) CBIT leads to accept the source principle in the international setting.3. So further work we need is to investigate (1) what is the optimal tax rate of CBIT or ACBIT taking account thetax-equity, (2) which is best CBIT,ACBIT or the traditional methods in the international setting.