This paper analyzes the effect of wage and interest taxation on investment
in human capital. It is shown that results derived under the assumption that
human.capital is a riskless asset fail to obtain when the return on human capi-
tal is uncertain. The interaction of the human capital investment decision
with savings, consumption and 1abor—leisure choices are taken into account.
An implication of the analysis is that, when the rate of return on human capi-
tal is stochastic, efficient taxation requires positive taxation of wage income
even when lump—sum taxation is feasible.