In the 1980s, income tax rates decreased and income tax deduction thresholds changed through income tax reforms in the OECD countries. Likewise, in Japan in the 1980s and 1990s, income tax rates decreased and the income tax deduction threshold increased. Recently, it has been pointed out that...

The primary objective of this paper is to examine how, and to what extent, changes in income tax rates and income tax deductions affect income inequality from a longitudinal perspective, by using microdata of Japanese individuals and households. The findings of this paper could shed light on the...