Sweep funds are automated cash management tools that move idle money out of your checking or brokerage account each business day and into a higher-yielding vehicle, usually a money market mutual fund or an interest-bearing deposit account at a partner bank. The transfer happens without any action from you, based on a target balance you or your institution sets. Cash sitting in a primary account often earns little or nothing, so the sweep exists to put every dollar above your day-to-day needs to work automatically.
How the Automatic Transfer Works
Every sweep starts with a target balance. That’s the dollar amount your primary account needs to keep on hand to cover debits, bill payments, and everyday transactions. Anything above the target gets swept out. If your balance drops below it, cash gets swept back in.
The transfer usually runs overnight, after the close of the Federal Reserve’s Fedwire system, during the same batch-processing window banks use for other end-of-day settlements. The institution’s software compares your balance against the target, calculates the surplus or shortfall, and moves money accordingly. By the time you log in the next morning, your operating balance is back where it should be.
Some institutions serving high-frequency trading firms or large corporate treasuries offer intraday sweeps that execute multiple times during business hours. For most individual account holders, the overnight cycle is quiet enough that you may not notice it happening at all.
Where Your Swept Cash Actually Goes
Surplus cash is typically routed to one of two destinations: a money market mutual fund or an interest-bearing deposit account at one or more banks affiliated with your institution. The choice matters because it determines how your money is protected, what yield you earn, and how the earnings are taxed.
Money Market Mutual Funds
When cash sweeps into a money market fund, it buys shares in a pooled investment that holds short-term, low-risk instruments like Treasury bills and commercial paper. The yield tracks short-term interest rates fairly closely. As of early 2026, a government money market sweep fund at a major brokerage was paying around 3.3% on a seven-day yield basis.
Management fees vary. The asset-weighted average across the industry was about 0.22% in 2024, with individual funds ranging from roughly 0.11% at the low end to 0.73% at the high end. Those fees come directly out of the yield, so a fund’s gross return and its net return to you are always different numbers.
Bank Deposit Sweep Programs
In a deposit sweep, your cash moves into FDIC-insured accounts at one or more partner banks. Many programs spread deposits across a network of banks specifically to multiply insurance coverage. Since FDIC insurance covers $250,000 per depositor per institution, a program that distributes your cash across ten banks could protect up to $2.5 million. Deposits at each bank are treated as yours under the FDIC’s pass-through insurance rules, meaning coverage follows the actual owner of the funds, not the intermediary that placed them.
The catch is that deposit sweep rates are set by the brokerage or bank running the program, not by market forces. They tend to lag well behind money market yields.
FDIC Insurance vs. SIPC Protection
The type of sweep vehicle determines which insurance regime applies, and the distinction matters more than most people realize.
Cash swept into bank deposit accounts is protected by FDIC insurance up to $250,000 per depositor, per bank. Multi-bank programs can extend that coverage substantially. But any deposits you already hold directly at a bank in the sweep network count toward that bank’s $250,000 cap. If your sweep sends $200,000 to a bank where you already have $100,000 in a savings account, only $250,000 of your combined $300,000 is insured there.
Cash swept into a money market mutual fund at a brokerage is not FDIC-insured. It falls under the Securities Investor Protection Corporation instead. SIPC covers up to $500,000 in securities and cash if your brokerage firm fails, with a $250,000 sub-limit for cash. Money market mutual funds are classified as securities under SIPC’s rules, not cash, so they receive protection up to the full $500,000 limit.1Securities Investor Protection Corporation (SIPC). What SIPC Protects SIPC protects against the failure of the brokerage firm holding your account. It does not protect against a decline in the value of the money market fund itself.
Sweep Accounts at Brokerages
At most broker-dealers, the sweep program is the default mechanism for handling uninvested cash. When you sell a stock, receive a dividend, or deposit funds that haven’t been invested yet, the cash is automatically swept into whatever vehicle your account is set up to use. This typically starts the moment you open the account, without you opting in.
The default arrangement connects to a federal rule that governs how brokerages handle customer money. SEC Rule 15c3-3, known as the Customer Protection Rule, requires broker-dealers to segregate customer cash and restricts firms from using your money as working capital for their own operations.2U.S. Securities and Exchange Commission. Key SEC Financial Responsibility Rules Sweep programs are the practical mechanism for satisfying this obligation: your cash goes into a segregated vehicle rather than sitting in a commingled house account.
U.S. securities now settle on a T+1 basis, meaning one business day after the trade date, so proceeds from a stock sale are available and eligible for sweeping by the next business day.3U.S. Securities and Exchange Commission. Shortening the Securities Transaction Settlement Cycle Your cash starts earning yield almost immediately after a trade settles rather than idling for days.
The Yield Gap: What You’re Actually Earning
Here’s where sweep accounts get contentious. The yield your brokerage pays on its default sweep vehicle can be dramatically lower than what you’d earn in a standalone money market fund or high-yield savings account. This gap is not an accident. It’s how many firms make money from your cash.
The spread across the industry is striking. As of early 2026, Fidelity’s default FDIC-insured deposit sweep was paying an APY of 1.84%, while its money market fund overflow option yielded about 3.3%. Some firms have historically paid as little as 0.01% on their default bank deposit sweeps for balances under $500,000. Meanwhile, standalone high-yield savings accounts and direct money market funds were widely available at 4% or more. On a $100,000 balance, the difference between 0.01% and 4% works out to roughly $4,000 a year in foregone earnings.
Default rates can be so low because most customers never check. Brokerages earn revenue on the spread between what they pay you and what they earn by deploying your deposits elsewhere. The business model works precisely because the sweep is automatic and invisible.
Regulators have taken notice. In January 2025, the SEC ordered Wells Fargo’s advisory units to pay $35 million in civil penalties for failing to adopt adequate policies and procedures around their cash sweep programs. The SEC found that from 2019 through May 2024, the bank deposit sweep was the only cash option available in most of the firm’s advisory accounts, and the rates it paid sometimes lagged other cash alternatives by more than 500 basis points.4U.S. Securities and Exchange Commission. Administrative Proceeding File No. 3-22391 Under Regulation Best Interest, broker-dealers must disclose conflicts of interest related to their compensation, and the SEC has specifically identified revenue from cash sweep programs as an example of a conflict that must be disclosed to retail customers.5U.S. Securities and Exchange Commission. Staff Bulletin – Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest
How Sweep Earnings Are Taxed
Sweep account earnings are taxable in the year they become available to you, regardless of whether you withdraw them. The tax form you receive depends on the type of sweep vehicle.
If your cash is swept into a bank deposit account, the interest is reported on Form 1099-INT, just like interest from any savings account or CD.6Internal Revenue Service. Topic No. 403, Interest Received If your cash is swept into a money market mutual fund, the earnings are technically dividends and are reported on Form 1099-DIV, even though they function like interest in practice.7Internal Revenue Service. Instructions for Form 1099-DIV Either way, the earnings are taxed as ordinary income at your marginal rate, not as capital gains.
The distinction usually doesn’t change your tax bill, but it can create confusion at filing time. If you switch sweep vehicles mid-year, you might receive both a 1099-INT and a 1099-DIV for what feels like the same account. Both report income that belongs on your return.
How to Check and Change Your Sweep Option
Most brokerages let you switch your sweep vehicle if you’re eligible for more than one option. At Schwab, for example, accounts may have access to a bank deposit sweep, an interest-bearing cash feature, or a money market fund sweep, and you can request a change by calling the firm or contacting your advisor.8Charles Schwab. Cash Features Program Disclosure Statement Other major brokerages have similar processes, though the available options vary by account type. Retirement accounts and trust accounts sometimes have fewer choices.
Before you switch, compare the yield on your current sweep vehicle against what’s actually available at your firm. Check whether the alternative is FDIC-insured or SIPC-protected. Look at whether the money market fund option charges a higher expense ratio than you’d pay investing in the same fund directly. Five minutes of reviewing your sweep settings is one of the highest-return uses of time in personal finance, particularly if you tend to keep significant cash in your brokerage account between investments.