Much attention has been paid to expense ratios of mutual funds. Yet, despite the fact that taxes have a substantial impact on the long-term performance of taxable mutual fund investors, far less attention has been paid to the impact of taxes on after-tax returns. And while the evidence is clear that it’s difficult for active fund managers to create superior investment performance by picking stocks or by timing markets, it’s relatively easy to avoid destroying value for taxable fund investors by managing investment taxes. For example, tax-aware funds might attempt to reduce the tax burden by avoiding the intentional realization of any short-term gains and by accelerating the realization of capital losses. Tax management strategies might not only reduce the tax burden, they might also generate lower trading costs. For example, tax-efficient investment strategies exhibit relatively low turnover, generating lower trading costs. In addition, liquidating stock positions with embedded capital losses and holding on to positions with capital gains might generate superior before-tax returns due to the momentum effect.