BIL vs BOXX vs SGOV: Two T-Bill ETFs and a Fund That Does Not Pay

Overview

BIL, BOXX, and SGOV are all Treasury bill ETFs tracking the ultrashort end of the U.S. government debt market, but they use fundamentally different mechanics to do it. BIL and SGOV hold actual Treasury securities maturing in one to three months, while BOXX uses exchange-listed box spread options to synthetic exposure to the same maturity bucket. The choice between them hinges on how you prioritize simplicity, cost, and liquidity.

How they differ

The biggest structural difference is BOXX's use of box spreads—a derivatives-based approach—versus the direct Treasury holdings in BIL and SGOV. That matters: BOXX trades at a significant premium to par ($118.55 per share) while BIL and SGOV are close to $100, reflecting the compounding of reinvested yields in BOXX's synthetic strategy. BIL and SGOV both distribute monthly and target equivalent Treasury bill exposure, but SGOV is substantially larger, with $115B in assets against $51.0B for BIL. SGOV's expense ratio of 0.09% undercuts both peers; BIL charges 0.1353% and BOXX 0.19%. BIL yields 3.45%, SGOV yields 3.59%, and BOXX does not report a distribution yield because it does not distribute—it reinvests all income, which explains its higher share price.

Who each is best for

BIL: Fits investors who want straightforward Treasury bill exposure with monthly income and a long track record; the fund has been operating since 05/25/2007 and holds actual securities, not derivatives.

BOXX: Fits investors comfortable with options-based mechanics who prefer to reinvest gains and don't need current distributions; the synthetic approach and lack of payouts appeal to those in a compounding phase or tax-sensitive account structures.

Key risks to know

• Box spread basis risk (BOXX): The fund's performance depends on how accurately box spreads track Treasury bill returns. Execution slippage, early unwinding, or basis deviations between the option spread and underlying bills could cause the fund to lag its stated objective, especially in periods of elevated volatility or illiquidity in the options market.

• NAV compression and price-to-par divergence (BOXX): BOXX's $118.55 share price reflects years of reinvested income; as the fund matures and distribution patterns stabilize, the share price premium to par may erode or become misaligned with intrinsic value, creating potential mark-to-market losses for existing holders.

• Interest rate and reinvestment risk (all): When Treasury bills mature, the fund reinvests at prevailing rates. If rates fall, distributions will decline; if rates rise sharply, the already-low duration of these holdings means little price appreciation to offset lower payouts.

• Counterparty risk (BOXX): Box spreads involve multiple option legs and potential counterparty exposure. While the structure is exchange-listed, derivatives carry operational and settlement risks that direct Treasury holdings do not.

Bottom line

If you want simplicity and direct Treasury exposure with minimal cost, SGOV's size and 0.09% expense ratio stand out. If you prefer a direct-holding approach with a longer history, BIL offers that at a slightly higher expense ratio. If you're indifferent to distributions and comfortable with options mechanics, BOXX's reinvestment compounding may appeal—but its synthetic structure and price divergence from par introduce operational complexity and basis risk that the other two don't carry. Past performance does not predict future results.