Generated August 16, 2026.
Overview
BIL and SHY are both Treasury-focused ETFs offering monthly distributions, but they occupy different points on the maturity spectrum. BIL holds Treasury bills with maturities of 1–3 months, functioning as a cash-like instrument with near-zero interest-rate risk. SHY holds Treasury bonds with 1–3 year maturities, offering slightly higher yield in exchange for material duration exposure. The choice between them hinges on whether you want stability of principal or willingness to accept price fluctuation for incremental income.
How they differ
The core distinction is maturity: BIL's 1–3 month bills carry minimal duration risk (beta of 0.06), while SHY's 1–3 year bonds have meaningful interest-rate sensitivity (beta of 0.22). This translates to NAV behavior—when rates rise, BIL's price barely moves, whereas SHY can see 2–4% declines. Both distribute monthly, but SHY yields 3.67% versus BIL's 3.58%, a gap that narrows when short rates rise relative to intermediate rates. SHY has been around longer (inception July 2002) and manages $25.5B in assets; BIL launched in May 2007 and holds $46.7B, making it the larger vehicle. Expense ratios are nearly identical (0.15% for SHY, 0.14% for BIL), so fees won't be a differentiator.
Who each is best for
BIL: Fits investors seeking a stable, ultra-liquid Treasury vehicle with minimal principal risk—those who view it as a high-yielding cash substitute rather than a bond investment and prioritize consistency of NAV over incremental yield.
SHY: Fits investors comfortable with modest duration exposure and 1–3 year interest-rate cycles who want a modest yield pickup over bill rates and can tolerate quarterly or seasonal price swings tied to Fed policy.
Key risks to know
- Duration risk (SHY): With a beta of 0.22, SHY's NAV will move meaningfully when Treasury yields shift. A 1% rise in interest rates could produce a 2–3% loss; conversely, falling rates can drive appreciation. BIL, by contrast, has almost no such risk at beta 0.06.
- Reinvestment risk (BIL): Because BIL holds 1–3 month bills, its portfolio rolls over frequently. If rates fall sharply, new bills maturing into the fund will yield less, causing the distribution to compress. Conversely, rising rates favor the fund, but investors shouldn't expect the current 3.58% yield to persist indefinitely.
- Yield compression in low-rate environments: Both funds derive income from the level of Treasury yields. In a prolonged low-rate regime, distributions could fall materially. Conversely, a sustained high-rate cycle favors both, though BIL resets faster (monthly maturity turnover).
- Opportunity cost (BIL): Ultra-short maturities mean BIL is unlikely to capture capital gains if the yield curve steepens or rates decline. Investors sacrificing potential price appreciation for stability should understand that tradeoff.
Bottom line
BIL is a Treasury cash equivalent with virtually no interest-rate risk; SHY adds 3–9 basis points of yield in exchange for meaningful duration exposure. If you want a high-yielding parking spot with stable NAV, BIL's scale ($46.7B) and minimal beta make it distinct. If you're comfortable with a 1–3 year bond holding and can tolerate price movement alongside Fed cycles, SHY's slightly higher yield and longer maturity profile may fit a broader fixed-income sleeve. Past performance does not guarantee future results, and yields will move with Treasury rates.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.
