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Le quotient familial : une structure fiscale cohérente avec le critère de Lorenz relatif

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  • Patrick Moyes
  • Alain Trannoy

Abstract

[eng] The family Quotient: a Tax Structure Consistent with the Relative Lorenz Criterion . by Patrick Moyes and Alain Trannoy . When households are identical in all characteristics other than income, an average rate of taxation increasing with primary income guarantees that disposable income is more evenly distributed than pre-tax income. This paper studies whether it is possible to obtain a similar finding with heterogeneous populations, where households can be differentiated by both income and family size. An equivalent transformation renders the income of different-sized households comparable and the tax system's redistributive capacity is evaluated by comparing Lorenz equivalent-income curves before and after taxation. We find that, when the single person is taken as the reference, most of the income tax systems in use are consistent with the goal of reducing inequalities. However, the family quotient procedure used in France is the only mechanism that makes the reduction in inequalities independent of the type of reference used. [fre] Le quotient familial : une structure fiscale cohérente avec le critère de Lorenz relatif . par Patrick Moyes et Alain Trannoy . Lorsque les ménages sont identiques en ce qui concerne toutes les caractéristiques autres que le revenu, un taux moyen de taxation qui augmente avec le revenu primaire garantit que les revenus disponibles sont moins inégalement distribués que les revenus avant taxation. Ce papier examine s'il est possible d'obtenir un résultat similaire dans le cas de populations hétérogènes où les ménages peuvent être distingués à la fois par le revenu et la taille familiale. Une transformation équivalente est utilisée pour rendre comparables les revenus de ménages de tailles distinctes et la capacité redistributive du système fiscal est évaluée à partir de la comparaison des courbes de Lorenz des distributions des revenus équivalents avant et après taxation. Nous montrons que la plupart des systèmes d' imposition des revenus en vigueur sont cohérents avec l'objectif de réduction des inégalités dès lors qu'on retient le célibataire comme référence. Si l'on désire que la réduction des inégalités soit indépendante du type de référence, alors la procédure du quotient familial utilisée en France est le seul mécanisme possible.

Suggested Citation

  • Patrick Moyes & Alain Trannoy, 1999. "Le quotient familial : une structure fiscale cohérente avec le critère de Lorenz relatif," Économie et Prévision, Programme National Persée, vol. 138(2), pages 111-124.
  • Handle: RePEc:prs:ecoprv:ecop_0249-4744_1999_num_138_2_5962
    DOI: 10.3406/ecop.1999.5962
    Note: DOI:10.3406/ecop.1999.5962
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    References listed on IDEAS

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