A cash and sweep vehicle is the default holding spot for uninvested money in your brokerage account. When cash lands in the account from a deposit, a dividend, or a securities sale, the brokerage automatically routes it into a designated vehicle so it earns at least some return instead of sitting idle. That vehicle is almost always one of two things: an FDIC-insured bank deposit program or a money market mutual fund. The difference between those two options can be worth thousands of dollars a year on a sizable cash balance.
How the Sweep Actually Works
Every sweep arrangement runs off a target balance. Your brokerage sets a threshold for the primary account, and any cash above that amount transfers automatically into the sweep vehicle at the end of each business day. You don’t move the money yourself. If your balance later drops below the threshold because you wrote a check, made a purchase, or bought securities, the system pulls cash back from the sweep vehicle to cover it.
This back-and-forth happens daily, usually after markets close. Your statement shows a line item labeled something like “cash and sweep vehicle” or “bank deposit program,” but the underlying transfers are invisible. The practical result is that your idle cash is always working somewhere.
Bank Deposit Sweep Programs
At most major brokerages, the default sweep vehicle is a bank deposit program. Your cash moves into interest-bearing deposit accounts at one or more FDIC-insured banks, often affiliates of the brokerage. The advantage is federal deposit insurance: the FDIC protects up to $250,000 per depositor, per insured bank, for each ownership category.1FDIC. Understanding Deposit Insurance
To extend coverage beyond that limit, many programs spread cash across a network of partner banks. Networks like IntraFi include more than 3,000 participating institutions. Each bank holds no more than $250,000 of your money, so the total insured amount can reach into the millions.2eCFR. 12 CFR 330.1 – Definitions
The catch is what you earn. Bank deposit sweeps frequently pay interest rates far below what the same cash would earn in a money market fund. As of March 2026, one major brokerage’s bank deposit sweep paid 0.02% on balances under $1 million, while its money market fund sweep option yielded over 3.2%.3Wells Fargo Advisors. Cash Sweep Rates and Yields The gap isn’t accidental. Bank deposit sweeps generate significant revenue for the brokerage and its affiliated banks.
Money Market Fund Sweep Programs
The alternative is a money market mutual fund. Rather than sitting in bank deposits, your cash goes into a fund that invests in short-term, low-risk securities like government debt and repurchase agreements. These funds are regulated by the SEC under Rule 2a-7, which limits credit quality and maturity. No individual security in the fund can mature beyond 397 days, and the fund’s weighted average maturity cannot exceed 60 days.4eCFR. 17 CFR 270.2a-7 – Money Market Funds
Government and retail money market funds are permitted to maintain a stable share price of $1.00, which makes them feel like a cash account. Institutional prime and tax-exempt money market funds must use a floating net asset value rounded to the fourth decimal place.
Breaking the Buck
The tail risk in a stable-NAV fund is “breaking the buck,” when the share price drops below $1.00. It has happened exactly twice. In 1994, the Community Bankers U.S. Government Money Market Fund liquidated at $0.96 per share. In 2008, the Reserve Primary Fund fell to $0.97 after heavy exposure to Lehman Brothers debt.5Investor.gov. Money Market Funds – Investor Bulletin Two events in decades of operation is a low-probability risk, but not zero. Money market funds do not carry FDIC insurance.
SIPC Coverage
Money market fund shares held at a brokerage are classified as securities and fall under the Securities Investor Protection Corporation. SIPC covers up to $500,000 in total assets when a member brokerage fails financially, including a $250,000 sublimit for cash.6SIPC. What SIPC Protects SIPC is not FDIC insurance in another wrapper. It doesn’t protect you against investment losses; it protects you against the brokerage itself going out of business.
The Yield Gap and Why It Matters
For most account holders, the default is a bank deposit program, and the yield is dismal. The spread between what affiliated banks earn on your deposited cash and what they pay you can be enormous. During 2022 through 2024, when market interest rates climbed rapidly, the SEC found that one major firm’s advisory clients earned yields that were sometimes nearly 400 basis points below what they could have received through other available options.7U.S. Securities and Exchange Commission. In the Matter of Merrill Lynch – Administrative Proceeding On a $100,000 cash balance, 400 basis points is roughly $4,000 a year in forgone interest.
The economics: the brokerage negotiates a rate with its partner banks based on a benchmark like the federal funds rate. The bank pays that rate to the brokerage, and the brokerage passes along a fraction of it to you, keeping the rest as compensation for operating the program. The portion retained by the brokerage can dwarf what you receive.
If your brokerage offers a choice between a bank deposit sweep and a money market fund sweep, compare the yields before assuming the default is fine. Not every brokerage lets you switch freely. Some restrict money market fund sweeps to certain account types or asset levels. Check your account settings or call your firm to find out what’s actually available to you.
Recent SEC Enforcement
In January 2025, the SEC charged Wells Fargo Advisors and Merrill Lynch with failing to adopt policies reasonably designed to consider the best interests of advisory clients when selecting sweep options. Both firms defaulted clients into low-yielding bank deposit programs while earning substantial revenue from the arrangement. The firms paid a combined $60 million in civil penalties.8U.S. Securities and Exchange Commission. SEC Charges Pair of Wells Fargo Advisory Firms and Merrill Lynch Under Regulation Best Interest, brokerages are required to disclose material conflicts tied to their recommendations, and cash sweep programs are specifically identified as a source of such conflicts.9U.S. Securities and Exchange Commission. Staff Bulletin – Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest Boilerplate saying a firm “may” have a conflict when the conflict actually exists doesn’t meet the bar.
Taxes on Sweep Earnings
Whatever your sweep vehicle earns, the IRS wants its share, and the treatment depends on which vehicle holds your cash.
- Bank deposit sweeps produce ordinary interest income, reported on a 1099-INT. Your brokerage or the partner bank must issue the form if you earn $10 or more in a calendar year.10Internal Revenue Service. About Form 1099-INT, Interest Income
- Money market fund distributions are classified as ordinary dividends, not interest, even though they feel like interest. You still report them as ordinary income.11Internal Revenue Service. Publication 550 – Investment Income and Expenses
Neither qualifies for the lower rates that apply to qualified dividends or long-term capital gains. If your sweep earns very little, the tax impact is negligible. If you hold substantial cash in a money market fund yielding over 3%, the tax bill adds up and should factor into your planning.
Liquidity for Trading and Spending
One genuine advantage of any sweep vehicle is liquidity. Your brokerage treats swept funds as available cash for most purposes. When you write a check, use a debit card, or place a trade, the system automatically pulls money from the sweep vehicle to cover the transaction. You don’t need to sell anything or initiate a manual transfer first. Standard securities settlement runs on a T+1 cycle as of May 2024, so a purchase settles one business day after execution.12FINRA. Understanding Settlement Cycles – What Does T+1 Mean for You
If You Walk Away From the Account
If you stop interacting with your account for an extended period, your swept cash can eventually be turned over to the state as unclaimed property. Most states trigger this after three to five years of inactivity, depending on the jurisdiction.13Office of the Comptroller of the Currency. When Is a Deposit Account Considered Abandoned or Unclaimed The dormancy clock usually starts when the account has no customer-initiated activity, such as trades, deposits, withdrawals, or logins. You can typically recover the money through your state’s unclaimed property office, but the process takes time, and the funds stop earning anything while they wait.