Which Short-Term Bond ETF Is the Better Buy: Vanguard's BSV or iShares' ISTB?

While the Vanguard Short-Term Bond ETF (NYSEMKT:BSV) offers a lower expense ratio and higher assets under management (AUM), the iShares Core 1-5 Year USD Bond ETF (NASDAQ:ISTB) provides a higher trailing-12-month dividend yield.

Both the Vanguard Short-Term Bond ETF and the iShares Core 1-5 Year USD Bond ETF focus on the short end of the investment-grade curve. These funds seek to provide stability and income by holding debt with maturities between one and five years, making them potential alternatives for investors looking to outpace traditional savings accounts while managing interest rate risk.

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-yr return represents total return over the trailing 12 months. Dividend yield is the trailing-12-month distribution yield.

The Vanguard Short-Term Bond ETF is the more affordable option with a 0.03% expense ratio, while the iShares Core 1-5 Year USD Bond ETF costs slightly more at 0.06%. However, the iShares fund provides a higher payout with a 4.3% trailing-12-month yield compared to 4% for the Vanguard fund, which may offset the higher fee for income-focused investors.

Performance & risk comparison

What's inside

Vanguard Short-Term Bond ETF is a fixed income fund with 3,205 holdings that primarily invests in U.S. government, corporate, and international investment-grade bonds. Launched in 2007, it has paid $3.12 per share over the trailing 12 months, which on its recent ~$77.69 share price works out to a 4% yield.

iShares Core 1-5 Year USD Bond ETF is a fixed income fund with 7,412 holdings that tracks the Bloomberg U.S. Universal 1-5 Year Index, providing exposure to a broader range of U.S. dollar-denominated bonds including mortgage-backed securities. Launched in 2012, it has paid $2.05 per share over the trailing 12 months, which on its recent ~$48.09 share price works out to a 4.3% yield.

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Which looks like the better buy

Short-term bond funds exist to do a specific job: produce steady income, preserve capital, and stabilize a portfolio when stocks get turbulent. Both BSV and ISTB do that job, but they draw the line between safety and income in different places.

BSV leans heavily on government-backed bonds alongside investment-grade corporate debt, keeping credit risk low and drawdowns historically shallow. It is one of the most dependable short-term bond funds available and manages nearly 10 times the assets of ISTB, giving it deeper liquidity and a longer institutional track record.

ISTB is a broader fund that includes some below-investment-grade corporate bonds and emerging market debt alongside the standard government and corporate mix, which is what pushes its yield modestly above BSV's. That extra reach comes with a modestly deeper historical drawdown, reflecting the added credit risk embedded in those less conventional holdings.

For investors who want their short-term bond allocation to act as true ballast with minimal credit risk, BSV is the stronger choice and you can get it for a much cheaper fee. ISTB is the better option for those willing to accept a small amount of additional risk in exchange for a higher yield from a more broadly diversified pool of bonds.

Sara Appino has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Vanguard Bond Index Funds - Vanguard Short-Term Bond ETF. The Motley Fool has a disclosure policy.