A cash sweep account is an automated arrangement that moves idle money out of your checking or brokerage settlement account at the end of each business day, parks it in a vehicle that earns interest or adds insurance protection, and pulls it back when a transaction needs funding. You set a target balance, and the system handles the rest without asking you to approve each transfer. The appeal is simple: cash that would otherwise sit at zero earns something. The catch is that the “something” ranges from almost nothing to a competitive market rate, and most account holders never check which end they are on.
How a Cash Sweep Account Works
Every sweep has two linked accounts. The source account is your primary checking or brokerage settlement account, where deposits land and transactions clear. The sweep vehicle is the destination that holds your excess cash and pays a return. A sweep agreement authorizes the institution to move funds between them automatically.
The target balance is the number that runs the system. It is the minimum you want to keep in the source account to cover day-to-day spending. At the close of each business day, the institution checks the source balance against the target. If you set a target of $5,000 and the day ends at $12,000, the extra $7,000 sweeps into the vehicle overnight.
The reverse sweep works the same way in the other direction. When a check clears or a payment posts and drops the source account below the target, the system pulls cash back from the sweep vehicle to cover it. That is what keeps overdrafts, and overdraft fees, from happening. The cycle resets every business day.
Where Your Swept Cash Actually Goes
Swept cash lands in one of two places, and the difference shapes both your yield and your insurance.
Money Market Fund Sweeps
Brokerage firms often sweep cash into money market mutual funds that hold short-term government debt, commercial paper, and similar low-risk instruments. Government and retail money market funds can maintain a stable $1.00 share price using amortized cost accounting, which is why your balance looks flat day to day. These funds are not FDIC-insured, and although it is rare, a fund can “break the buck” and lose value. Fund disclosures state plainly that you can lose money.
Bank Deposit Sweep Programs
The alternative is a bank deposit sweep, where your cash is placed into deposit accounts at one or more FDIC-insured banks. Many programs spread the money across a network of partner banks so that each bank’s share stays under the FDIC’s $250,000 per depositor, per bank, per ownership category limit. Large sweep networks commonly provide $3 million to $5 million in coverage, and networks with hundreds of participating banks can offer $50 million or more for commercial clients. Deposits and withdrawals processed before a midday cutoff typically settle the same business day.
FDIC vs. SIPC Protection
People mix these two up, and the mistake can be expensive.
Cash swept into a bank deposit program is covered by FDIC insurance up to $250,000 per ownership category at each bank in the network. The multi-bank structure exists specifically to keep each bank’s share under that ceiling.
Cash swept into a money market fund at a brokerage is not FDIC-insured. It may be covered by the Securities Investor Protection Corporation if the brokerage is a SIPC member and the firm itself fails. SIPC advances up to $500,000 per customer, with a $250,000 sublimit on cash claims, to cover shortfalls in customer property. SIPC does not protect you if the money market fund loses value. It only steps in when the member broker-dealer collapses.
What You Actually Earn
Sweep yields vary enormously across institutions, and this is the single most important thing to understand before accepting a default sweep option.
As of early 2026, bank deposit sweep rates at some of the largest wirehouses sit as low as 0.02% on balances under $1 million. On $100,000, that is $20 a year. High-yield savings accounts and competitive money market funds have been paying many times that. Automated portfolio programs at some firms offer considerably higher sweep rates, depending on the platform and account type.
The gap between what you earn and what the institution earns is the revenue engine. Banks profit from the spread between the interest they pay on deposits and the income they generate lending those deposits out. Some firms also receive per-account fees from affiliated banks for each account that sweeps into the program. Those fees give firms a reason to default clients into their own bank deposit sweep rather than into a higher-yielding alternative.
Money market fund sweeps carry their own cost in the form of an expense ratio, generally running from about 0.25% to 0.50% annually depending on the fund and share class. Part of that fee often flows back to the brokerage as a recordkeeping or servicing payment. Funds that pay the broker more tend to pay you less.
Bank deposit sweeps usually show no separate fee because the cost is already baked into the interest rate. Either way, the result is the same shape: you earn less than you would putting the money directly into a competitive savings account or buying Treasury bills on your own.
Regulatory Action on Low Sweep Rates
In January 2025, the SEC charged Merrill Lynch and two Wells Fargo advisory firms with failing to adopt policies and procedures reasonably designed to consider the best interests of clients when selecting cash sweep options. The firms offered bank deposit sweep programs as the only option for most advisory clients while earning significant revenue from those deposits. During periods of rising interest rates, the SEC said the yield gap between the firms’ sweep programs and other available alternatives grew to nearly 4%. The three firms paid a combined $60 million in civil penalties to settle without admitting or denying wrongdoing.
The account type you hold changes the firm’s duty to you. Investment advisers owe fiduciary duties under the Investment Advisers Act of 1940, and the SEC brought those enforcement claims under Sections 206(2) and 206(4). Broker-dealers operate under Regulation Best Interest, a different standard that still requires acting in the customer’s best interest but has not yet been the basis for a sweep-specific enforcement action. If you hold an advisory account, your firm’s obligations on your sweep rate are measurably higher than if you hold a standard brokerage account.
How Sweep Income Gets Taxed
Tax treatment depends on where your cash lands.
Interest earned through a bank deposit sweep is reported on Form 1099-INT. The institution must issue the form if it pays you $10 or more in interest during the year. You report the amount as ordinary interest on your federal return.
Income from a money market fund sweep is reported on Form 1099-DIV, not 1099-INT, because money market funds are mutual funds and their distributions are classified as dividends. The IRS reports these in Box 1a as ordinary dividends taxed at ordinary income rates, not at the lower qualified dividend rates.
You owe tax on sweep income whether or not you receive a form. If your institution pays less than $10 in interest and skips the 1099, the income is still reportable. If you fail to provide your taxpayer identification number, backup withholding applies to the payments.
Which Accounts Can Use Which Sweep Options
Not every account type qualifies for every sweep vehicle.
Individual, joint, and custodial brokerage accounts at most firms are eligible for the widest range of options, including bank deposit programs, money market funds, and linked bank accounts. Entity accounts such as trusts, LLCs, and corporations may have access to government money market funds but can be excluded from retail prime money market funds, which SEC rules limit to natural persons.
IRAs and other retirement accounts can often participate in bank deposit sweeps and government money market funds, but restrictions apply. Inherited IRAs, IRAs using certain advisory services, and accounts managed through independent third-party advisers may be excluded from bank deposit sweep programs entirely. Check the sweep disclosure for your specific account type instead of assuming the options match those of a standard brokerage account.
Advisory accounts frequently have the fewest sweep choices. At some firms the bank deposit program is the only option, which is the precise arrangement that drew the 2025 SEC enforcement actions.
Setting the Target Balance and Choosing a Vehicle
Opening a sweep comes down to two decisions.
The first is the target balance. Set it too high and your cash sits unproductive. Set it too low and reverse sweeps run constantly, which at some institutions can create minor settlement delays.
The second decision matters more, and most people make it by accepting the default. If your institution offers a bank deposit sweep at 0.02% alongside a money market fund paying several percent, the difference on a $50,000 balance works out to hundreds of dollars a year. Many firms let you change the sweep vehicle through online account settings or by calling, but they rarely volunteer that information.
Once the program is running, your monthly statements include a sweep activity section listing every transfer, its direction, and the interest or dividends earned. Compare the rate you are receiving against current market rates every few months. A sweep rate that was competitive earlier in the year may not be now, especially when rates are moving. If your institution’s rate lags what you could earn in a high-yield savings account or by buying a money market fund directly by a full percentage point or more, that spread is money leaving your account every month it continues.