The Hidden Cost of Convenient Cash
Most investors check their portfolio for stock performance, bond yields, and fund expense ratios. What they rarely scrutinize is the pile of uninvested cash sitting inside that same account – cash that, at the big three brokerage firms, is almost certainly working harder for the broker than it is for the account holder. Vanguard, Schwab, and Fidelity all sweep idle cash into default positions that tend to pay far less than what’s available just a few clicks away.
The gap between what these default cash positions pay and what’s available at high-yield savings accounts or money market funds isn’t trivial. For someone holding $10,000 or $20,000 in cash at a brokerage – waiting to invest, saving for a near-term goal, or simply parked after a recent sale – the difference can translate to hundreds of dollars a year in lost interest. Moving that money, or at least understanding where it sits, is one of the more straightforward improvements an investor can make without touching a single stock or fund.
How the Big Three Handle Your Idle Money
Each major brokerage has a default cash sweep program, and none of them are structured primarily around maximizing what you earn. Schwab, for instance, routes uninvested cash into its own bank sweep program, which has drawn criticism – and at least one regulatory settlement – for paying rates well below what clients could access elsewhere. Fidelity defaults cash into its FDIC-insured cash program or, in some accounts, a lower-yielding government money market fund. Vanguard’s default tends to be its Federal Money Market Fund, which is more competitive than some alternatives but still not necessarily the highest-yielding option available to investors who look around.
The business logic behind low sweep rates is straightforward. When a brokerage holds your cash in its affiliated bank and pays you, say, 0.45%, then lends that money out at a higher rate, the spread goes directly to the firm’s bottom line. Schwab has been unusually transparent about this – its executives have described net interest revenue as a central pillar of the company’s business model, making the low sweep yields a feature of their revenue strategy rather than an oversight. That context matters when evaluating where to park cash.
What’s Actually Available Elsewhere
High-yield savings accounts at online banks have consistently offered rates several times what major brokerage sweep accounts pay, particularly since the Federal Reserve began its rate-hiking cycle in 2022. While those rates have come down from their 2023 peaks as the Fed eased, many online savings accounts still offer annual percentage yields in the range of 4% or higher, depending on the institution and timing.
Treasury bills and Treasury money market funds represent another option that some investors overlook. Because Treasury interest is exempt from state income taxes, the effective yield is higher than the stated rate for anyone living in a state with meaningful income tax. A 4.5% Treasury yield is worth more after tax than a 4.5% yield from a bank account for a taxpayer in New York, California, or Massachusetts.
Certificates of deposit are a third route, though they require locking up funds for a set term. CD rates at many institutions still pay two to three times the national average, which itself remains depressed by the large traditional banks that dominate the calculation. For cash that genuinely won’t be needed for three, six, or twelve months, a CD can lock in a competitive rate even if the broader interest rate environment shifts downward during that period.
What makes this somewhat frustrating from an investor’s perspective is that many of these alternatives aren’t dramatically more complicated than leaving money in a brokerage sweep account. Opening a high-yield savings account at an online bank takes roughly the same effort as opening a brokerage account. Transferring money between linked accounts typically settles within one to three business days. The friction is real but modest, and for larger cash balances, the yield difference justifies the inconvenience almost immediately.
The Liquidity Trade-Off Worth Knowing
There is a legitimate reason some investors keep cash inside their brokerage rather than at a separate institution: speed of deployment. If you spot a buying opportunity on a Tuesday morning, cash already inside your brokerage account can be used to purchase securities the same day. Cash sitting at an external savings account needs to be transferred first, which typically means a one-to-three-day delay – though some institutions offer instant transfers for smaller amounts through linked debit cards or internal transfer networks.
For investors who trade frequently or who want to stay ready to act quickly, keeping a portion of cash inside the brokerage makes sense. For investors whose cash is more of a medium-term holding – an emergency fund parked at the brokerage out of habit, or proceeds from a sale waiting to be redeployed over the next several months – the liquidity argument is weaker. They’re paying the convenience premium without necessarily needing the convenience.
Making the Math Work for Your Balance
The decision of whether to move cash comes down to balance size and time horizon. On a $2,000 balance, even a 3.5-percentage-point yield difference produces $70 a year – real money, but not enough to upend a person’s financial life. On a $50,000 balance, that same spread generates $1,750 annually. On $100,000, it’s $3,500. At those levels, the few minutes spent opening a high-yield savings account or purchasing a Treasury bill through TreasuryDirect.gov pays an unusually high hourly rate.
Investors who prefer to stay entirely within their brokerage ecosystem do have some options. Both Fidelity and Vanguard offer money market funds with yields that are more competitive than their default sweep options – but investors typically have to opt into them manually, which is the point. The default is almost never the best available rate, and the brokerages have limited financial incentive to remind you of that. At Fidelity, the Fidelity Government Money Market Fund (SPAXX) and the Fidelity Treasury Money Market Fund (FZFXX) are commonly cited alternatives to the default cash position, each with distinct yield characteristics and tax treatment.
Schwab’s situation is particularly worth watching heading into 2025 and beyond. After years of criticism over its cash sweep practices, the company has signaled some adjustments to how it handles client cash, though the specifics and timing remain in motion. Anyone holding a meaningful cash balance at Schwab should verify, in their specific account type, exactly which vehicle their cash is sitting in and what it’s currently yielding – because the answer may have changed recently, or may be about to.
