SWVXX vs SGOV: Where Should Idle Cash Sit at Schwab?

Overview

SGOV and SWVXX are both short-duration fixed-income securities designed to provide yield on capital parked in cash or near-cash positions. SGOV is an ETF that tracks U.S. Treasury bills maturing in three months or less, while SWVXX is a money market fund that holds a diversified portfolio of commercial paper, certificates of deposit, and other prime money market instruments. The key distinction is credit exposure: SGOV's holdings are backed by the full faith and credit of the U.S. government, whereas SWVXX carries counterparty risk from private and foreign issuers.

How they differ

SGOV limits itself exclusively to Treasury securities, making it a pure government-backed vehicle with zero credit risk from private issuers. SWVXX holds a broader basket of money market instruments, including corporate commercial paper and CDs, which introduces credit and counterparty risk but historically has allowed it to offer a modest yield advantage—3.78% versus SGOV's 3.66%. SGOV trades as an ETF and can be bought and sold on an exchange at any point during the trading day; SWVXX, as a money market fund, prices once daily at $1.00 per share and is typically used as an internal sweep vehicle within Schwab accounts. SGOV carries an expense ratio of 0.07%, while SWVXX's costs are embedded in its yield; SGOV's $99.9B AUM is substantial but dwarfed by SWVXX's $249B.

Who each is best for

SGOV: Fits investors who view safety from credit risk as the primary consideration and are willing to accept a slightly lower yield in exchange for direct Treasury exposure, or who want to hold short-duration Treasuries outside a brokerage cash management platform.

SWVXX: Designed for Schwab account holders seeking a higher yield on uninvested cash and willing to accept exposure to investment-grade money market credits in exchange for that extra income.

Key risks to know

• Credit risk in SWVXX. While prime money market funds carry low default risk, they are subject to the creditworthiness of issuers (corporate borrowers, foreign banks, domestic institutions). In a credit stress event, the value of holdings could be impaired or issuers could default; SGOV faces no such risk.

• Money market fund regulations and gates. SWVXX operates under SEC Rule 2a-7, which includes provisions allowing the fund to impose redemption gates or liquidity fees if stress conditions emerge. SGOV, as an ETF, has no such restriction.

• Interest rate sensitivity. Although both hold very short-duration instruments, SGOV's value will move with Treasury prices if interest rates shift, creating small daily NAV fluctuations. SWVXX maintains a constant $1.00 NAV per share, hiding interest rate effects until reinvestment occurs.

• Yield compression in a lower-rate environment. Both funds' distributions are driven by prevailing short-term interest rates; a sustained decline in Fed policy rates would erode their attractiveness relative to longer instruments.

Bottom line

If you prioritize absolute safety and don't mind a 12-basis-point yield difference, SGOV's Treasury-only composition eliminates credit risk. If you hold a Schwab account and want to maximize yield on cash reserves while accepting minimal money market credit exposure, SWVXX's 3.78% and $249B scale make it a practical alternative. Neither is a long-term holding; both serve as tactical parking places for capital. Past performance doesn't predict future results.