Abstract
We analyze the portfolio choice of an investor who can invest in tow risky assets (in addition to a riskless asset) and who is subject to taxes on realized capital gains. These taxes appear in the portfolio choice problem as a form of time-independent, endogenous transaction costs. Similar to the case of portfolio choice with transaction costs, the optimal strategy of the taxable investor contains a no trade region originating from the excercise of the option to defer capital gains taxes. This may lead an investor to hold a markedly undiversified portfolio, for reasonable parameter values. With multiple risky assets the investor is effectively holding a portfolio of tax-deferral options. The value of these options is considerable, in the range of 5-10% of the wealth of an investor with constant relative risk aversion. Such value is decreasing in the volatility and correlation of the assets and in the risk aversion. If the risky assets can be held only through a mutual fund, the investor incurs a cost due to the loss of flexibility whose magnitude is small when assets re positively correlated but can increase considerably as the correlation decreases.
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