How do taxable income responses to marginal tax rates differ by sex, marital status and age ? Evidence from Spanish dual income tax

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How do taxable income responses to marginal tax rates differ by sex, marital status and age ? Evidence from Spanish dual income tax

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Title: How do taxable income responses to marginal tax rates differ by sex, marital status and age ? Evidence from Spanish dual income tax
Author: Díaz Caro, Carlos; Onrubia Fernández, Jorge
Abstract: El objetivo de este trabajo es analizar cómo los contribuyentes españoles respondieron a la introducción del modelo de doble imposición del impuesto sobre la renta de las personas físicas en 2007. Los autores estiman la elasticidad de la renta imponible (Rentabilidad) respecto al tipo impositivo marginal neto para diferentes grupos de contribuyentes por sexo, estado civil y edad, separando el efecto sustitución del efecto renta. Para el análisis empírico, los autores utilizan microdatos del panel de la declaración del IRPF difundido por el Instituto Español de Estudios Fiscales. Los principales resultados muestran que la reforma fiscal de 2007 dio como resultado un rango de valores de elasticidad de 0,41 a 0,43, mientras que el efecto de renta estimado arroja un valor negativo de -0,18. Los resultados para los diferentes grupos de contribuyentes son los siguientes: la eliminación de los jubilados de la muestra reduce significativamente el ETI; la elasticidad es mayor para las mujeres que para los hombres; los solteros tienen una elasticidad considerablemente mayor que los contribuyentes casados; y el ETI disminuye con la edad. Además, los autores encuentran que el costo marginal de los fondos públicos aumentó después de la reforma, y la tasa impositiva marginal máxima está por encima de lo óptimo.The aim of this paper is to analyse how Spanish taxpayers responded to the introduction of the dual personal income tax model in 2007. The authors estimate the elasticity of taxable income (ETI) with respect to the marginal net tax rate for different groups of taxpayers by sex, marital status and age, separating the substitution effect from the income effect. For the empirical analysis, the authors use microdata from the Spanish personal income tax return panel disseminated by the Spanish Institute of Fiscal Studies. The main results show that the 2007 tax reform resulted in a range of elasticity values from 0.41 to 0.43, while the estimated income effect yields a negative value of –0.18. The results for the different taxpayer groups are as follows: the removal of retired people from the sample significantly reduces the ETI; elasticity is higher for women than for men; single people have a considerably higher elasticity than married taxpayers; and the ETI decreases with age. Additionally, the authors find that the marginal cost of public funds increased after the reform, and the top marginal tax rate is above optimal.
URI: http://hdl.handle.net/10662/10331
Date: 2018


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