TY  - RPRT
        AU  - Doerrenberg, Philipp
AU  - Peichl, Andreas
AU  - Siegloch, Sebastian
        TI  - Sufficient Statistic or Not? The Elasticity of Taxable Income in the Presence of Deduction Possibilities
        PY  - 2014/Oct/
        PB  - Institute of Labor Economics (IZA)
        CY  - Bonn
        T2  - IZA Discussion Paper
        IS  - 8554
        UR  - https://www.iza.org/publications/dp8554
        AB  - The elasticity of taxable income (ETI) is often interpreted as a sufficient statistic to assess the welfare costs of taxation. Building on the conceptual framework of Chetty (2009), we show that this assertion does no longer hold for tax systems with deduction possibilities if (i) deductions generate externalities and (ii) deductions are responsive to tax rate changes. While the first condition should arguably hold for almost any imaginable tax deduction, we provide a thorough empirical examination of the second condition.
Relying on rich German panel data from administrative tax records, we exploit several tax reforms that were implemented in Germany between 2001 and 2008. Our baseline estimates indicate an overall ETI of 0.49 and an elasticity of deductions with respect to the net-of-tax rate of -2.80. Given that the majority of deductions in the German income tax system generate externalities, our non-zero deduction elasticity suggests that the ETI is not sufficient to calculate the welfare cost of taxation.
        KW  - elasticity of taxable income
KW  - deductions
KW  - tax expenditures
KW  - sufficient statistic
KW  - administrative data
KW  - Germany
        ER  -