Optimal income taxation with a risky asset : the triple income tax
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- Discussion papers (SAM) 
We show in a two-period world with endogenous savings and two assets, one of them exhibiting a stochastic return that an interest adjusted income tax is optimal. This tax leaves a safe component of interest income tax free and taxes the excess return with a special tax rate. There is no trade-off between risk allocation and efficiency in intertemporal consumption. Both goals are reached. As the resulting tax system divides income into three parts, the tax can also be called a Triple Income Tax. This distinction and a special tax rate on the excess return is necessary in order to have an optimal risk shifting effect.
PublisherNorwegian School of Economics and Business Administration. Department of Economics