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The Suitability of Tax Data to Study Trends in Inequality. A Theoretical and Empirical Review with Tax Data from Switzerland

Author

Listed:
  • Oliver Hümbelin
  • Rudolf Farys
Abstract
In many countries results of inequality trends are ambiguous, because different methodological approaches blur the picture or because reliable data are not available. In this paper we assess whether tax data are suitable for inequality trend analysis. We do this by comparing tax data measurement concepts concerning income definition, statistical units and population coverage to theoretical ideal concepts. To get a sense of direction and magnitude of potential biases, we estimate the impact of tax data-related methodological options for inequality measures with Swiss tax data. Where possible and meaningful, we compare tax data results to corresponding results from surveys. While there are clear advantages of tax data like long-term availability and reliable population coverage in more recent years, there are also drawbacks that lead to an overestimation of inequality and hinder comparability over time. In sum, tax data are a source that should be used with care, but nonetheless seem to be indispensable for inequality analysis. As a substantive result for Switzerland, our tax data analysis raises doubts about the declining inequality trend reported by survey data for the last decades.

Suggested Citation

  • Oliver Hümbelin & Rudolf Farys, 2015. "The Suitability of Tax Data to Study Trends in Inequality. A Theoretical and Empirical Review with Tax Data from Switzerland," University of Bern Social Sciences Working Papers 16, University of Bern, Department of Social Sciences.
    • Handle: RePEc:bss:wpaper:16
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    File URL: https://repec.sowi.unibe.ch/files/wp16/Huembelin-Farys-Taxdata-2015.pdf
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    References listed on IDEAS

    as
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    Full references (including those not matched with items on IDEAS)

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    More about this item

    Keywords

    Tax Data; Inequality Trend; Income Distribution; Switzerland;
    All these keywords.

    JEL classification:

    • D31 - Microeconomics - - Distribution - - - Personal Income and Wealth Distribution
    • H24 - Public Economics - - Taxation, Subsidies, and Revenue - - - Personal Income and Other Nonbusiness Taxes and Subsidies

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