Demographic change and income tax revenues – results from a large microsimulation model for Germany

Lena Calahorrano, Luca Rebeggiani, Sven Stöwhase and Martin Teuber

Journal of Economic Policy Reform, 2019, vol. 22, issue 4, 399-419

Abstract: Similarly to many other European countries, Germany has experienced a considerable demographic shift since the 1970s: higher life expectancy and diminishing birth rates, only partly balanced by immigration, have led to an altered population structure with an increasing share of elderly people. In the next decades, population aging in Germany will accelerate and also induce a decline of the total population. These demographic changes can be expected to have a profound impact on the governmental budget. While shifts in public expenditures have been forecasted regularly since 2005, the revenue side has received less attention to date. We study the long-term (2015–2060) shifts in income tax revenues induced by demographic change. Our aim is to quantify possible fiscal effects of demographic change using microsimulation and to identify elements of the income tax code particularly affected. We find the expected demographic changes to have a clear negative impact on income tax revenues. Population aging increases the impact of various deductibility rules on total income tax revenues, in particular the impact of the deductibility of old-age and health insurance provisions. The impact of the deductibility of exceptional expenses such as expenses for caregiving also increases, but remains small overall. Due to expected increases in real incomes, however, demographic change does not imply an absolute drop in income tax revenues in the next decades.

Date: 2019
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DOI: 10.1080/17487870.2018.1469984

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