Generated June 2026 from current fund data.
Overview
BND and IEF are both broad, low-cost bond ETFs that track U.S. benchmarks and distribute monthly income. The key difference is scope: BND holds the entire investment-grade bond market—Treasuries, corporates, mortgage-backed securities, and agencies—while IEF owns only mid-duration Treasuries (7–10 year maturities). This makes BND a complete fixed-income building block and IEF a duration-specific play.
How they differ
BND's Bloomberg Aggregate Index covers the full landscape of U.S. investment-grade debt, delivering natural diversification across issuer types and maturity buckets. IEF locks into a single Treasury maturity band, so its price and yield move tightly with that 7–10 year slice of the yield curve.
The expense ratios reflect that simplicity: BND costs 0.03%, while IEF runs 0.15%. Both yield around 4.0%, but IEF's higher beta of 1.17 versus BND's 0.98 signals greater interest-rate sensitivity—that Treasury duration positioning amplifies moves when rates shift. IEF has deeper history (inception July 2002 vs. April 2007), though both funds are well-established. AUM separates them too: BND's $158B dwarfs IEF's $46.9B, which can matter for liquidity and index-tracking precision.
Who each is best for
BND: Fits investors who want a single, market-weight fixed-income core holding—no need to layer or juggle multiple bond funds. Works for portfolios seeking broad credit and duration exposure with minimal ongoing rebalancing.
IEF: Designed for investors building a bond-ladder or barbell strategy who want explicit control over duration bands, or who prefer pure Treasury exposure without corporate or mortgage credit risk. Also fits those tilting toward mid-duration Treasuries based on yield-curve views.
Key risks to know
- Interest-rate sensitivity gap: IEF's beta of 1.17 means it will fall (and rise) harder than the broader market when Treasury rates move. BND's 0.98 beta reflects a shorter blended duration, so it's less volatile but also less price-sensitive to rate rallies.
- Credit spread risk in BND: The Aggregate includes corporate bonds and mortgage-backed securities alongside Treasuries. In a widening-credit environment, these spreads can compress holdings while Treasuries hold steady, dragging total returns. IEF sidesteps this entirely.
- Reinvestment risk at current yields: Both funds distribute around 4% monthly. As those coupons are reinvested or spent, long-term total return depends on where rates are when each coupon arrives—currently a headwind if yields fall, a tailwind if they rise.
- Duration mismatch in BND: Holding everything from 1-year floaters to 30-year bonds means BND's effective duration sits between its components. Investors seeking pure mid-duration exposure get a blend instead; IEF is clearer in that regard.
Bottom line
If you're building a simple, diversified fixed-income foundation and want the lowest cost, BND's broad market exposure and 0.03% fee stand out. If you're constructing a tactical ladder or want pure Treasury exposure without corporate credit, IEF's focused duration and Treasury-only holdings merit the higher fee and volatility. Remember that past performance doesn't predict future results, and both funds' total returns depend heavily on where rates move from here.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.
