SGOV vs TBIL: Which Is the Better Pick in 2026?

Overview

SGOV and TBIL are both ultra-short-duration Treasury ETFs designed to deliver yields close to the current money-market rate with minimal interest-rate risk. SGOV tracks an index of all Treasury bills maturing within three months, while TBIL holds only the most recently auctioned 3-month Treasury bill. The key distinction is breadth: SGOV owns a rolling basket, while TBIL maintains a single "on-the-run" security that it replaces each auction cycle.

How they differ

SGOV and TBIL chase nearly identical yields (3.66% vs. 3.60%) but achieve them through different holding structures. SGOV's index approach means it holds multiple Treasury bills across the 0-3 month maturity ladder, rolling positions continuously as securities mature. TBIL simplifies to one security — the most recently issued 3-month bill — and holds it until the next auction, at which point it switches to the freshly auctioned bill.

The cost trade-off is stark: SGOV charges 0.07% in annual expenses against a much larger asset base ($99.9B), while TBIL charges 0.15% on a smaller $7.26B. TBIL's higher fee reflects the operational cost of periodic replacement into a single on-the-run security; SGOV's scale advantage lets iShares keep fees below one basis point. Both carry negative beta (near zero), confirming their cash-like behavior.

Who each is best for

SGOV: Fits investors seeking the tightest possible cost structure for Treasury bill exposure and comfortable with a diversified, continuously rolling bill basket. The vast AUM suggests deep liquidity.

TBIL: Fits investors who prefer simplicity — holding a single official on-the-run bill — and are willing to accept a higher fee for that structural clarity and the known replacement schedule tied to Treasury auctions.

Key risks to know

• Yield compression if rates fall. Both funds' distributions track the 3-month Treasury yield, which moves with Fed policy. A sustained drop in short rates would lower distributions materially.

• Reinvestment timing mismatches in TBIL. Because TBIL replaces its entire position at each 3-month auction, the fund is exposed to timing risk if auctions coincide with temporary rate dips or spikes. SGOV's rolling basket of multiple maturities smooths this effect.

• Fee drag over time, especially TBIL. The 8 basis-point fee difference is small in absolute terms but compounds. Over ten years at flat yields, TBIL's cumulative drag would exceed 0.8% of principal relative to SGOV.

• Credit risk (minimal but present). Both hold U.S. Treasuries, so credit risk is the sovereign risk of the U.S. government — among the world's lowest, but not zero in extreme fiscal scenarios.

Bottom line

If you prioritize lowest cost and a diversified rolling basket, SGOV's 0.07% fee and $99.9B scale make it the natural home for Treasury bill exposure. If you value the conceptual simplicity of holding one official on-the-run bill and don't mind a higher fee for that clarity, TBIL's structure offers that trade-off. Both track the same short-term Treasury yield and carry minimal interest-rate or credit risk; the choice hinges on fee sensitivity and preference for structural approach. Past performance does not predict future results.