Your Brokerage Pays Interest on Idle Cash. It May Be Almost Nothing.

Regulators found some “sweep” accounts trailing the alternative by nearly four percentage points. On $50,000 of uninvested cash, that gap is roughly $1,750 a year — and nobody is going to call and tell you.

On January 17, 2025, the Securities and Exchange Commission fined two Wells Fargo advisory firms and Merrill Lynch $60 million over how they handled clients’ uninvested cash. The detail buried in the announcement is the one worth your afternoon: the SEC found that the gap between what those firms’ deposit sweep programs paid and what other cash options paid “at times grew to almost 4 percent” (SEC press release 2025-16, January 17, 2025).

Four percent. On money the clients already had, in accounts they were already paying fees on.

What a “sweep” actually is

Sell a fund, take a dividend, or wire money into a brokerage or IRA without immediately buying something, and the firm automatically moves that cash — sweeps it — into a default spot that pays interest. Every brokerage does this. You almost certainly never picked yours.

There are usually two or three options. One parks your cash in bank deposit accounts — FDIC-insured, often paying very little. Another puts it in a money market mutual fund, which typically pays closer to short-term market rates but carries no FDIC insurance. The firm chose your default, not you.

This is a live legal fight, not a niche complaint. Oppenheimer Holdings disclosed on April 24, 2026 that it agreed to pay $70 million to settle a class action over its sweep program, and noted in the same filing that the case was “one of approximately 25 cases filed against various financial institutions concerning their ‘cash sweep’ programs” (Oppenheimer Holdings, SEC Form 8-K Exhibit 99.1, April 24, 2026).

What this means for your wallet

Say you have $50,000 in cash parked in an IRA between moves — a common spot after selling a position or rolling over a 401(k). Vanguard’s Federal Money Market Fund (VMFXX) reported a 7-day SEC yield of 3.58% as of June 30, 2026, with an expense ratio of 0.11% (Vanguard fund fact sheet, June 30, 2026). At that rate, $50,000 earns roughly $1,790 over a year. A sweep paying near zero on the same balance earns pocket change. That is the size of the box your account is checked into.

Same money, same account, same firm. The difference is a setting. Your numbers will differ; the point is to go look.

That takes about five minutes. Log in and find “cash features,” “sweep,” or “core position” in your settings — or call the number on your statement and ask two plain questions: What rate is my uninvested cash earning right now? and What other cash options is this account eligible for? You’re entitled to a straight answer to both.

The catch — and there is one

Higher yield is not free of trade-offs, and anyone who skips this part is selling you something.

Money market funds are not FDIC insured. Vanguard says so on the fund’s own fact sheet: an investment in the fund “is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency” (Vanguard, June 30, 2026). These funds aim to hold a stable $1 share price but aren’t guaranteed to.

Coverage differs by option. Charles Schwab’s own Cash Features Program Disclosure Statement tells clients to assume bank deposit sweep balances carry FDIC insurance and “not expect coverage from SIPC,” while its Schwab One Interest feature “is not a bank account or other bank obligation, is not guaranteed by any bank, and is not insured by the FDIC.” Rates there, the same document says, “are set at our discretion and can change daily” and “can be reduced to zero in certain circumstances” (Schwab Cash Features Program Disclosure Statement, retrieved September 2, 2026).

Some switches are one-way. That same Schwab disclosure says accounts moving away from its Money Fund Sweep feature “are not permitted to change back.” Ask your own firm whether a change is reversible before you make it.

Rates float. The Federal Reserve held its target range at 3.50%–3.75% on July 29, 2026, and meets again September 15–16, 2026 (Federal Reserve, FOMC statement, July 29, 2026). Every figure here is a snapshot, not a promise.

The takeaway

Find out what your idle cash is earning. That’s the whole assignment. If the number surprises you, ask what else the account is eligible for and what you’d give up to move — then decide at your own pace. No firm is going to call you about this, and if someone does call claiming your sweep account needs urgent action, that’s a tell, not a favor. Hang up and dial the number on your own statement.

This is information, not financial advice. Yields, insurance coverage, and account terms change — verify current figures with your own firm and talk to a licensed professional about your situation. Senior Savers is independent and is not affiliated with any brokerage named here.

Want the plain-English version each week? Join the free Senior Savers newsletter — one email, no pressure, unsubscribe any time.

Sources

• U.S. Securities and Exchange Commission, press release 2025-16, January 17, 2025 — sec.gov
• Oppenheimer Holdings, Form 8-K Exhibit 99.1, April 24, 2026 — sec.gov
• Vanguard Federal Money Market Fund fact sheet, June 30, 2026 — vanguard.com
• Charles Schwab, Cash Features Program Disclosure Statement, retrieved September 2, 2026 — schwab.com
• Federal Reserve, FOMC statement, July 29, 2026 — federalreserve.gov