Generated August 15, 2026.
Overview
BND and IEF are both fixed-income ETFs that track U.S. bond indexes, but they target very different slices of the market. BND holds the broad Bloomberg Aggregate Index—a mix of Treasuries, investment-grade corporates, mortgage-backed securities, and other eligible bonds. IEF focuses narrowly on intermediate-term Treasuries (7–10 year maturity). The key distinction is breadth versus simplicity: BND gives you the whole U.S. bond market in one fund; IEF isolates government bonds in a specific maturity window.
How they differ
The fundamental difference is asset composition. BND's Bloomberg Aggregate exposure includes corporates, mortgages, and other credit instruments alongside Treasuries, while IEF holds only Treasury securities in the 7–10 year part of the curve. That credit exposure in BND creates a higher yield (4.17% vs. IEF's 4.10%) but introduces corporate and mortgage credit risk that IEF avoids entirely.
On fees, BND is dramatically cheaper: a 0.03% expense ratio versus IEF's 0.15%, a fivefold difference. Over decades, that gap compounds meaningfully. BND's asset base ($161B) dwarfs IEF's ($47.3B), reflecting its role as a core market-tracking fund. IEF trades with a slightly higher beta (1.15 vs. 0.98), meaning it swings more sharply with Treasury yield moves—a natural consequence of its narrower, more duration-sensitive exposure.
Both distribute monthly and have been around long enough to show institutional durability (BND since 2007, IEF since 2002).
Who each is best for
BND: Fits investors building a foundational fixed-income allocation and wanting the simplest, lowest-cost route to capture the entire investable U.S. bond market, including both government and investment-grade corporate exposure.
IEF: Designed for investors who want pure Treasury exposure without credit risk and don't mind paying slightly higher fees for the laser focus on intermediate-maturity government bonds—or who expect interest-rate sensitivity to be a feature, not a limitation.
Key risks to know
- Duration mismatch risk. IEF's concentration in 7–10 year Treasuries magnifies NAV swings when rates move sharply; BND's diversified maturity ladder and asset mix smooth those moves. A steep yield-curve environment could compress IEF's returns while leaving BND's broader index less scarred.
- Credit spread compression. BND's corporate and mortgage holdings benefit when credit spreads narrow but suffer when they widen. IEF has no corporate risk, so it won't participate in tightening spreads but also won't absorb widening-spread losses.
- Reinvestment-rate risk. Both hold bonds that mature or pay coupons regularly. In a falling-rate environment, reinvested cash lands at lower yields; IEF's more homogeneous maturity schedule may face this more acutely than BND's blended index.
- Fee drag across time. BND's 0.03% expense ratio accumulates to meaningful capital preservation over a 20+ year horizon versus IEF's 0.15%, especially in a low-return bond environment.
Bottom line
If you want broad, cheap market exposure and can tolerate modest credit risk, BND's ultra-low fees and diversified holdings stand out. If you prioritize Treasury-only simplicity and don't mind paying for it, IEF isolates government bonds and gives you more duration sensitivity to interest-rate moves. Past performance does not guarantee future results.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.
