%0 Report %A Apps, Patricia %A Rees, Ray %T Optimal Taxation, Child Care and Models of the Household %D 2012 %8 2012 Aug %I Institute of Labor Economics (IZA) %C Bonn %7 IZA Discussion Paper %N 6823 %U https://www.iza.org/index.php/publications/dp6823 %X This paper presents for the first time the properties of optimal piecewise linear tax systems for two-earner households, based on joint and individual incomes respectively. A key contribution is the analysis of the interaction of second earner wage differences, variation in prices of bought-in inputs into household production in the form of child care, and domestic productivity differences as determinants of across-household heterogeneity in second earner labour supply. The analysis highlights the importance of the elasticity of substitution between parental and non-parental child care in determining the relationship between utility and income across households. A central result is that taking account of a richer and more realistic specification of household time use widens the set of cases in which individual taxation is welfare-superior to joint taxation. %K household production %K time allocation %K optimal taxation %K child care %K inequality %K labour supply