Income Inequality and Evaluation of Tax Effect on Redistribution of Income in Japan 1984-2004

Yukinobu Kitamura
Takeshi Miyazaki

March 2012


This paper investigates the statistical measurement of income distribution and evaluates the income redistribution effect of income tax system in Japan, using National Survey of Family Income and Expenditure 1984-2004. This paper finds first that income inequality has been widening over time, especially in the young (age 39 or less) and middle (age 40-59) groups, second that tax role of income redistribution has been weaken since 1984, and third that the income redistribution effect by taxation is strong in the old (age 60 or above) group because distribution of before tax income is already very unequal among them.

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