This article integrates the theory of welfare stigma and the theory of optimal income taxation. We study optimal income taxation and an optimal welfare program within a unified framework while taking welfare stigma into account. In our framework, the government is assumed to have two policy instruments, namely general income taxation and a welfare program. Individuals are assumed to be heterogeneous along two dimensions, namely wages (skill) and welfare stigma. The government cannot observe the two characteristics of individuals. Each individual is assumed to take the income tax schedule and the parameters of the welfare program as given and make labor supply decisions to maximize his utility. The government is assumed to choose both an optimal income tax schedule and an optimal welfare program so as to maximize a social welfare function subject to its own revenue budget constraint and individuals' behavioral response to the income tax schedule and the parameters of the welfare program. As the model cannot be solved analytically, we take a numerical simulation approach. Our simulations show that (1) it is optimal for the government to offer both a negative income tax schedule and a welfare program, which is consistent with the theoretical result obtained by An in a much-simplified version of our model, and (2) the actual welfare program in the United States might be less generous than the optimal welfare program. © The Author(s) 2010.
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