Choosing the Right Fixed-Income Path: Broad Market or Municipal Debt?

The choice between iShares National Muni Bond ETF (NYSEMKT:MUB) and Vanguard Total Bond Market ETF (NASDAQ:BND) typically hinges on an investor's tax status and preference for tax-exempt municipal income versus broad exposure to the taxable bond market.

For investors building a core fixed-income allocation, these two funds represent different approaches to high-quality debt. While both aim for stability, their underlying tax treatments and sector exposures create distinct profiles that suit different brokerage account types. The iShares fund tracks municipal bonds, while the Vanguard fund covers the broad taxable investment-grade market.

Snapshot (cost & size)

Beta measures price volatility relative to the S&P 500; beta is calculated from monthly returns over the available fund history (up to five years). The 1-year return represents total return over the trailing 12 months. Dividend yield is the trailing-12-month distribution yield.

The Vanguard fund is more affordable for long-term holders, carrying an expense ratio of 0.03% compared to 0.05% for the iShares fund. For income seekers, the Vanguard fund also provides a higher payout with a 4.2% distribution yield, while the iShares fund offers a 3.3% yield.

Performance & risk comparison

What's inside

Vanguard Total Bond Market ETF aims to replicate the taxable U.S. investment-grade market and currently holds 16,305 positions. Its holdings are highly diversified, with no single position exceeding 0.41% of the total assets under management (AUM). It was launched in 2007. Vanguard Total Bond Market ETF has paid $2.94 per share over the trailing 12 months, which, on its recent ~$70.81 share price, works out to a 4.2% yield.

iShares National Muni Bond ETF targets high-quality municipal bonds from across the U.S. and currently holds 7,544 securities. It was launched in 2007. iShares National Muni Bond ETF has paid $3.42 per share over the trailing 12 months, which, on its recent ~$102.48 share price, works out to a 3.3% yield.

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Which looks like the better buy

When comparing the iShares National Muni Bond ETF (MUB) and the Vanguard Total Bond Market ETF (BND), investors should consider several key factors. Let's see what they tell us about each fund.

First, we should examine each fund's strategy. BND is a bond ETF that tracks the broad U.S. dollar-denominated taxable bond market. In other words, it holds many types of bonds, ranging from U.S. Treasuries to corporate debt. MUB, on the other hand, focuses on the municipal bond sector, which offers certain tax advantages.

Two other important factors are historical performance and income potential. Since 2021, MUB has generated a total return of 2.6%, equating to a compound annual growth rate (CAGR) of 0.5%. BND, meanwhile, has delivered a total return of -0.7%, equaling a -0.1% CAGR. As for income, BND currently boasts a dividend yield of 4.2%, while MUB's is 3.3%.

One final factor to weigh is cost. Ultimately, both funds are remarkably affordable. BND boasts an expense ratio of only 0.03%, while MUB's is 0.05%. For context, an investor who buys $10,000 worth of each fund should expect to pay only $3 per year in fees for their BND shares and $5 per year for their MUB shares.

In summary, MUB and BND are both bond ETFs, but they focus on different market segments. BND is broad-based and designed to capture a broader view of the fixed-income marketplace, while MUB is narrowly focused on municipal bonds. In the end, the needs and goals of individual investors will play the largest role in selecting between these funds. BND is useful for those seeking diversified exposure and more significant cash flow, while MUB is largely designed for individuals seeking to lower their tax burden while simultaneously deriving income from their portfolio.

Jake Lerch has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Vanguard Total Bond Market ETF. The Motley Fool has a disclosure policy.