Millions of Fidelity account holders park cash in FDRXX without a second thought, but the fund tucked quietly into their core position may be generating more income than anything else in their portfolio right now.
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The Federal Reserve has cut its target rate by 75 basis points over the past year, from 4.5% to 3.75%, and yet 3-month Treasury bills still yielded 3.87% on August 12, 2026. That is the quiet backdrop for Fidelity Government Cash Reserves (FDRXX), the money market fund sitting in millions of Fidelity brokerage accounts as either a core position or a parking spot between trades. Most owners have never opened its fact sheet. It is doing more portfolio work than they think.
What FDRXX Actually HoldsFDRXX is a government money market fund. Under SEC Rule 2a-7, it must invest at least 99.5% of assets in cash, U.S. government securities, and repurchase agreements collateralized by those securities. The portfolio is a rolling ladder of very short Treasury bills, agency paper, and overnight repos backed by Treasuries. The fund aims for a stable $1.00 share price, though that is a goal, not a guarantee.
Because holdings reset constantly, the fund’s yield tracks the front end of the Treasury curve in near real time. When the Fed hikes, the yield climbs within weeks; when the Fed cuts, it falls just as quickly.
The Rate Environment Doing the Heavy LiftingThe Fed funds target upper bound has been held at 3.75% since December 10, 2025, an eight-month pause after three consecutive cuts. That stable ceiling lets short-dated Treasuries clear near current yields. As of August 12, 2026, the Treasury curve’s short end printed 3.78% at 1 month, 3.87% at 3 months, and 3.97% at 6 months. A government money market fund earns that band, minus expenses.
On a $50,000 cash balance, a yield in the high-3s throws off well over $150 a month in interest. Compare that with the FDIC national average 12-month CD rate of 1.68% as of July 1, 2026, and the appeal of leaving cash inside a money market fund rather than a bank savings account becomes obvious.
How It Fits Alongside Other Fidelity Core PositionsFidelity offers several government money market funds as core cash positions. FDRXX is the default sweep for retirement and older brokerage accounts; SPAXX is the default for newer taxable accounts; FDLXX leans more heavily into direct Treasury holdings, which can matter for state tax purposes. All three are high-quality, ultra-short, government-only. Yields typically move together within a few basis points. Fidelity publishes each fund’s 7-day yield on its product page.
The TradeoffsThe yield is not locked in. If the Fed resumes cutting, FDRXX’s payout drifts down with T-bill rates. The 10Y-2Y Treasury spread of 0.48% on August 12, 2026 sits well above inversion, but the yield curve has been steepening off a June 22, 2026 low of 0.27%, signaling long-term expectations are firming while the front end could still ease.
Interest is taxed as ordinary income at the federal level. A portion from direct Treasury holdings may be exempt from state and local tax, but the exact share varies year to year. Investors in high-tax states sometimes prefer a Treasury-only fund for that reason.
With the VIX at 14.55 on August 12, 2026, in the bottom 4.3% of its 12-month range, markets are calm and risk assets have rewarded investors. Cash in FDRXX serves a preservation role while equities compound.
Who This Fund SuitsFDRXX earns its keep for money you need within one to two years: emergency reserves, a house down payment, quarterly tax set-asides, or brokerage cash waiting on a buy order. It also makes sense for retirees holding a cash bucket to fund near-term withdrawals without touching stocks in a down year. Investors with a decade-plus horizon have better options; leaving too much long-term capital in a money market fund is a classic drag on retirement outcomes.
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