Fiscal Space under Demographic Shift

In this paper we quantitatively explore implications of ageing demographic structure for government revenue raising capacity through lens of fiscal space. We base our analysis on dynamic general equilibrium, overlapping generations model calibrated to data from Japan and USA.We first map out fundamental-based fiscal limit using the Laffer curve approach, and then compute fiscal space in terms of budgetary room between the current revenue and the maximum revenue defined by the peak of Laffer curves. We demonstrate that the evolution of underlying demographic structures plays an important role in shaping a country’s fiscal limit and fiscal space. There will be significant contractions in fiscal space in Japan and USA when the two countries enter their late stage of demographic transition in 2040. In particular, the results from the model calibrated to Japan indicates that an increase in old-age dependency ratio to over 70 percent can reduce Japan’s fiscal space by 36 percent. When factoring in the increased fiscal cost of existing commitments to the age pension program, the net fiscal space for Japan turns negative.