Recherche Carnet de chercheur Yukinobu KITAMURA


Intergenerational Transfers and Inheritance Tax in Japan


Currently I am interested in aspects of intergenerational transfers (bequests and gifts) between generations (mainly through parents to children). This was my D.Phil. thesis topic at Oxford in 1988. Given the rapid aging process and over two decades’ stagnation in Japan, it seems like an opportune moment to rethink how intergenerational transfers matter. My colleague, Chiaki Moriguchi, at Institute of Economic Research in Hitotsubashi University, has collaborated with the leading researcher in this field, Thomas Piketty of EHESS and Emmanuel Saez of UC Berkeley on income distribution project. Through my attachment to EHESS, I plan to extend our collaboration with the French experts.

In particular, as the vice chairman of the Statistical Committee, Government of Japan, I have assumed the responsibility to examine and approve official statistics at the government. The committee promotes open access to the broader government statistics, including tax revenue data to the academic research uses. During my attachment to EHESS, it will be productive for me to discuss with the French experts on how the French scholars gained collaborated with the French Tax Authority to use the French Tax data and other official micro dataset. Below presents descriptive, available statistics in line with my research question.

Intergenerational Transfers and Household Wealth Holdings

Figure 1 illustrates the historical trend for household wealth. In 2014, according to the SNA statistics, total household wealth accounted for 2727.1 trillion yen, of which non- financial wealth 1031.6 trillion yen and financial wealth 1695.5 trillion yen. Household liabilities (debt) account for 367.7 trillion yen. Therefore, net total wealth accounts for 2359.4 trillion yen.
Figure 1. Historical Trends of Household Wealth

Figure 2 illustrates the historical trends of household wealth vis-à-vis debt level. In 1969, the total household wealth was 176.85 trillion yen, of which non-financial wealth 112.6 trillion yen and financial wealth 64.26 trillion yen. As the household liabilities 24 trillion yen, net total wealth was 152.87 trillion yen. It was only 6 % of net total wealth in 2014. Substantial capital accumulation has been made over the past 50-60 years through high saving rates. Figure 3 illustrates the relationship between the economic growth rate and the household saving rate.
Figure 2. Historical Trends of Total Household Wealth and Debt

Figure 3 shows that decline in the saving rates overtime explains the slowdown of capital accumulation process after the 1990s. At the same time, Figures 1 and 2 together illustrate that household wealth remains more or less the same level since 1990 despite the fact of rapid aging. Recall the life cycle hypothesis of Franco Modigliani predicts that households would de-cumulate wealth as the households age. In this context, the bequest motive of saving model is consistent with the trend in data. Of course, we can reject the possibility of lower growth rate on the increased share of inheritance, aside from the only bequest motive argument (DeLong 2003).
Figure 3. Economics Growth and Household Saving Rate

Thomas Piketty proposed a method for calculating how household wealth would transfer to the next generation (i.e., he calculates the wealth-inheritance ratio et, =Wt/Bt, equivalent to a generational length, which is the average age at parenthood). Given the historical record of et in Japan (i.e., 29-30 years old and aggregate household wealth Wt), one can estimate the amount of intergenerational transfer (inheritance in a broad sense), Bt. Figure 4 illustrates its historical trend. It illustrates that a substantial amount of intergenerational transfers has been conducted among the Japanese households whether or not it is based on the bequest motive.

Figure 4. Estimate of Annual Intergenerational Transfers

After the 1990s, annual intergenerational transfers account around 70-80 trillion yen. At the moment, we are calculating bequest transfer at death by using age-wealth distribution data multiplied by total death number by age. Then the gap between annual intergenerational transfers and bequest transfers would yield the gift transfers. Our goal in this project is to identify the size of bequest and gift transfers among household. The policy implication we aim at is to promote the discussion on how the tax authority should handle with gift transfer activities.


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