Tax-managed fund comparison

Vanguard offers three funds which are explicitly tax-managed. However, index funds and ETFs are inherently tax-efficient, and are sometimes less expensive; therefore, the tax-managed funds may not always be the best options even for taxable investors.

General Recommendations
Vanguard Tax-Managed Small-Cap Fund and Vanguard Tax-Managed Capital Appreciation Fund are worth holding if your taxable account needs a separate large-and-mid-cap or small-cap fund (and, in the case of TM Capital Appreciation, you don't mind its slight growth bias, say because you have a value bias in your IRA.) Except in the top tax bracket, TM Capital Appreciation is probably not worthwhile as a substitute for a large-cap-only fund; use 500 Index.

Total Stock Market is still better than a combination of tax-managed funds, except in the top tax bracket, and even then it is just as good.

Vanguard Tax-Managed Balanced Fund has no advantage over the individual funds other than simplicity, and may lead to extra tax costs.

Vanguard also used to have a Tax-Managed International Fund; this fund has been merged into Developed Markets Index. If you previously had TM International and have been converted, you should keep these shares rather than selling for a capital gain because the additional cost is trivial but Total International is better as the core of a taxable international portfolio.

Comparisons
Disclaimer: All of these calculations depend on assumptions about taxes and dividends, and may not represent the actual taxes or dividends of any fund. (Dividend yields are based on SEC yields as of April 19, 2013.) Consult your tax advisor for tax advice.

Calculations will be done with three tax assumptions: 15%/25%/top tax brackets. In the 15% tax bracket, qualified dividends and long-term gains are taxed at 0%. In the 25% tax bracket, qualified dividends and long-term gains are taxed at 15%. In the top tax bracket, investment income is taxed at 43.4% (including the 3.8% Affordable Care Act surcharge) and qualified dividends and long-term gains are taxed at 23.8% (including the surcharge). The total costs include the expense ratio of the fund.

All calculations assume Admiral or ETF shares of the alternative funds; given the $10,000 minimum for the tax-managed funds, you should have Admiral shares, and for multiple-fund combinations, the cost of waiting for Admiral shares is trivial. Expense ratios are adjusted for the acquired fund fees and expenses from Business development companies; the SEC requires these fees to be included in the reported ratio but they are misleading in a comparison of indexes.

Tax-Managed Small-Cap
TM Small-Cap tracks the same index as the S&P 600 ETF. Currently, TM Small-Cap has 0.02% lower expenses, but the S&P 600 ETF may reduce its expenses as it gets larger. The reported yields are almost equal, and neither fund is likely to distribute a capital gain. The advantage of TM Small-Cap is from its 100% qualified dividends, versus 75% assumed for the S&P 600, and the current lower cost.

If you do not use ETFs, Small-Cap Index has an expense ratio 0.03% less than TM Small-Cap, but a higher cap range, so you need more of Small-Cap Index to get the same small-cap exposure. In addition, it has a 0.29% higher yield, which causes dividend taxes to cancel out the cost savings.

Tax-Managed Capital Appreciation
TM Capital Appreciation tracks the Russell 1000 index, with equal expenses to the ETF but a lower yield because it selects stocks to reduce dividend yields. Both funds should have 100% qualified dividends and avoid all capital gains; the tax-managed fund benefits from the lower yield.

Large-Cap Index is an alternative fund, and the alternative you would use if you do not use ETFs. It is a similar index with 0.02% lower expenses. 500 Index misses most of the mid-caps, but if you don't need mid-caps, it may be an even better deal than the tax-managed fund with a 0.07% lower expenses. 500 Index has a slightly higher yield because large-cap stocks have higher yields than mid-cap stocks.

Tax-managed funds versus Total Stock Market
80% TM Capital Appreciation and 20% TM Small-Cap approximates the allocation of Total Stock Market. However, Total Stock Market saves 0.07% in expenses, also has 100% qualified dividends, should never distribute a capital gain, and eliminates your own potential capital gains from rebalancing the large-cap and small-cap funds. Total Stock Market thus comes out ahead of the TM combination except in the top tax bracket, and even there, you might lose the advantage of two basis points to capital gains from rebalancing.

Tax-Managed Balanced
TM Balanced is essentially the same as 49% TM Capital Appreciation and 51% Intermediate-Term Tax-Exempt. The expenses are equal, so the balanced fund has no advantage over the two separate funds other than simplicity. It isn't really suitable for a single-fund portfolio because it lacks international stocks. In addition, it has the usual disadvantage of a balanced fund in a taxable account: you cannot sell bonds without paying a capital gain on your stock sales.

Total international
While TM International no longer exists, it was merged into Developed Markets Index. To get the same allocation as Total International (which includes small-caps and emerging markets), you need 65% TM International, 20% Emerging Markets, 15% FTSE All-World Ex-US Small-Cap. The FTSE Small-Cap fund should be held as an ETF because it has no Admiral shares and the ETF is much less expensive; the others can be held as Admiral shares or ETF. The three-fund combination has 0.14% expenses, compared to 0.16% for Total International.

Even if the expense ratio on Total International doesn't decrease to eliminate the 0.02% difference, you are likely to lose that 0.02% to tax costs. You will have your own tax costs from rebalancing the three-fund combination, and even if you overweight small-cap or emerging markets so that you need three funds, using Total International as the core holding will reduce the amount you need in the small-cap and emerging markets funds and thus the amount of rebalancing. The three-fund combination may have a disadvantage on qualified dividends if a stock moves to a different index before the 61-day holding period for qualified dividends. FTSE Small-Cap may distribute some capital gains; it distributed capital gains in 2009 and 2010 but not in 2011 and 2012. And as a non-tax cost, you will lose a bit to transaction costs buying and selling FTSE Small-Cap, which trades at a large spread.