The Cash Sweep Trap: Why Your Brokerage Cash Earns Nothing

In March 2026, Daniel sold a small rental property near Columbus and parked the $48,000 in his brokerage account while he figured out what to do with it. He assumed the money was earning something. His broker was paying him 0.40%.

Eight months later, the cash had earned him about $128. Sitting in a money market fund paying 3.6%, the same $48,000 would have thrown off roughly $1,150 over those same eight months. He had quietly handed his brokerage more than a thousand dollars for the privilege of letting his money sit still.

Daniel didn't do anything wrong, exactly. He just didn't know that the cash in a brokerage account has a default setting, and that the default is almost always the worst option on the menu. This is the cash sweep trap, and as of mid-2026 it's costing American investors billions of dollars a year in interest they never see.

What a cash sweep actually is

When you deposit money into a brokerage account, or when a stock you sold settles, or a dividend lands, that cash doesn't just float around as "cash." The brokerage automatically moves it, or sweeps it, into a holding place that pays some rate of interest until you do something with it. That holding place is your sweep account.

Here's the part that matters: you usually don't choose it. The brokerage picks a default for you, and at most of the big firms the default is a "bank deposit sweep." Your cash gets routed to a bank, often one the brokerage owns or partners with, where the bank lends it out at market rates and pays you a sliver of the spread. The brokerage keeps the rest.

That sliver is small. According to Crane Data, which tracks the cash management industry, the average yield on brokerage sweep deposits under $250,000 sits around 0.40% in 2026. Meanwhile a plain government money market fund, which holds the safest short-term debt there is, pays close to ten times that.

The whole sweeps market is enormous. It holds roughly $2 trillion in customer cash. Most of that money is earning the low sweep rate by default, and most account holders have no idea there's a better option one click away.

The yield gap is bigger than it sounds

A few tenths of a percent doesn't sound like much. Run the numbers and it stops looking small.

Say you keep $25,000 in cash in your brokerage, which is not unusual for someone between investments, saving for a house, or holding a bond ladder's worth of dry powder. At a 0.40% sweep rate, that cash earns you $100 a year. Move it into a money market fund yielding 3.6%, and the same $25,000 earns $900. That's an $800 difference for a five-minute change you make once.

Scale it to Daniel's $48,000 and the gap is over $1,500 a year. For a retiree holding $150,000 in cash through a volatile market, the difference between the sweep rate and a money fund is more than $4,500 annually. None of that requires taking on more risk. A government money market fund and a bank deposit sweep are both about as safe as cash gets. You're simply being paid more for the same thing.

The reason the gap persists is inertia. The sweep rate is invisible. It never shows up as a fee, because technically it isn't one. You just earn less than you could, the brokerage earns the difference, and unless you go looking, you never find out.

How the big brokerages handle it

Not every firm treats your cash the same way, and the differences are worth knowing before you assume you're fine.

Fidelity and Vanguard: the good defaults

Fidelity and Vanguard are the friendlier of the major players, because at both firms the default sweep is itself a money market fund rather than a low-yield bank account.

At Fidelity, uninvested cash in a standard brokerage account defaults into SPAXX, a government money market fund. At Vanguard, your "settlement fund," the account that handles cash moving in and out, is the Vanguard Federal Money Market Fund, ticker VMFXX, which carried a 7-day yield around 3.6% as of early June 2026. If you custody your cash at either firm and never touch the default, you're already in decent shape. It's worth confirming, but the structure is on your side.

Schwab and the wirehouses: check immediately

This is where people lose money. At Charles Schwab, uninvested cash in a brokerage account defaults to a bank sweep paying a small fraction of a percent, and Schwab no longer offers a money market fund as an automatic sweep option for most accounts. You can still buy one. You just have to do it yourself.

The full-service "wirehouse" brokers are the same story or worse. If your account is at Morgan Stanley, Merrill, Wells Fargo Advisors, or a similar advisor-driven firm, your cash is very likely swept into a bank deposit program paying close to nothing, while the brokerage earns the spread. The fix is identical everywhere: you have to manually buy a money market fund or a Treasury bill with the idle cash. The default will not do it for you.

The SEC already called this out

If this feels like it should be against the rules, regulators agree, at least in part.

On January 17, 2025, the Securities and Exchange Commission announced settled charges against two Wells Fargo advisory firms and against Merrill Lynch over their cash sweep programs. The firms paid civil penalties totaling $60 million: $35 million across the two Wells Fargo entities and $25 million from Merrill. The SEC's finding was blunt. For advisory clients, the firms had defaulted cash into bank sweep programs with yields that were, in the agency's words, as much as 4 percentage points lower than reasonable alternatives, while the firms collected the benefit.

Here's the catch that should make you check your own account. That settlement only covered advisory clients, the people paying a firm to manage their money under a fiduciary standard. The SEC itself has estimated that money in advisor-managed accounts is only 10% to 20% of the entire sweeps market. The other 80% or more sits in ordinary self-directed brokerage accounts that the 2025 settlement never touched. If you opened your own account and trade on your own, you're in that larger, unprotected group. Nobody is obligated to move your cash to a better rate, and nobody will.

The pressure is real enough that the banks feel it. Wells Fargo disclosed that raising the rates it pays on swept cash trimmed $128 million off a single quarter's interest profit in late 2025. That number is a rough measure of how much one bank was earning on the gap, and a hint at how much customers across the industry are leaving behind.

What to do about it this week

Closing the gap is genuinely a few minutes of work. Here's the order I'd go in.

Find out what you're actually earning

Log into your brokerage and look for the current yield on your cash, sweep, or settlement balance. It's often buried in account settings or a "cash management" page. If you can't find it, call and ask one question: "What rate am I earning on my uninvested cash right now?" If the answer starts with a zero and a decimal point, you have money to recover.

Buy a money market fund or T-bills with the idle cash

If your cash is parked at a low rate, the fix is to manually move it. The two clean options are a government money market fund (at Fidelity, SPAXX or SPRXX; at Schwab, SWVXX or SNVXX; at Vanguard, VMFXX) or short-term Treasury bills bought directly. Both are low-risk places to hold cash you'll need in months rather than years. You place the order the same way you'd buy a stock, and the cash starts earning the higher yield the next business day.

Know the safety trade-off, because it's small but real

Bank sweep deposits carry FDIC insurance up to $250,000 per bank. Money market funds don't have FDIC coverage; instead they have SIPC protection and hold ultra-short, high-quality debt. For a government money market fund, the practical risk of loss is very low, and it has been for decades. For most people the modest difference in safety is a fair trade for several times the yield, but if you're holding cash above $250,000 or you simply want FDIC backing, you can ladder the money across brokered CDs or multiple bank options instead.

The Bottom Line

Your brokerage cash has a default setting, and that default is usually built to pay you as little as legally possible. The good news is that fixing it is one of the highest-return five-minute tasks in personal finance. Three steps to take this week:

1. Check your current cash yield today. Log into every brokerage account you hold and find the rate on uninvested cash. Anything under 1% means you're in a low-paying bank sweep and leaving money on the table.

2. Move idle cash into a money market fund. If you're at Schwab, Morgan Stanley, Merrill, or Wells Fargo, manually buy a government money market fund (SWVXX, SPAXX, VMFXX, or your firm's equivalent) with cash you're not about to invest. The yield jumps from a fraction of a percent to roughly 3.5% the next business day.

3. Set a calendar reminder to check the rate twice a year. Money fund yields drift with the Fed, and the spread between your sweep and the alternatives changes. A two-minute check each January and July keeps you from sliding back into the trap.