What Is Cash Sweep Activity? Rates, Insurance, and Taxes

Cash sweep activity is the automatic, usually daily transfer of uninvested cash in your brokerage or bank account into an interest-bearing vehicle so the money earns a return instead of sitting idle, with the funds moved back whenever you need them for a trade or withdrawal. Most firms sweep balances into either a deposit account at a partner bank or a money market mutual fund. The yield you earn, the insurance that protects the cash, and the tax form you receive at year-end all depend on which vehicle your firm uses.

How the Daily Sweep Works

When you open a brokerage account, your firm typically asks you to pick a sweep program for any uninvested cash. Many firms have a default option, often a bank sweep, that enrolls you automatically if you don’t choose.¹ Once you are enrolled, the system checks your settlement account balance, often using a threshold as low as one dollar, and automatically moves anything above that amount into the designated interest-bearing vehicle.

The transfer out is called a “sweep out,” and it happens without you initiating anything. When your account needs cash to settle a securities purchase or cover a withdrawal, a “sweep in” pulls money back into the settlement account. This runs automatically every business day, so your cash is always either earning a return or available to fund a transaction.

One timing note worth knowing. Since May 2024, U.S. securities settle on a T+1 basis, meaning trades must be finalized by the next business day after execution.² The sweep mechanism still handles internal cash movement automatically, but if you fund purchases through an external bank transfer like ACH, you may need to initiate the payment a day earlier than you used to.

Where Your Swept Cash Goes

Swept balances land in one of two places, and the choice matters for both yield and insurance.

Bank Sweep Programs

In a bank sweep, your uninvested cash moves into one or more deposit accounts at partner banks. Those banks may be affiliates of your brokerage or unrelated third-party institutions.¹ The cash earns interest at a variable rate set by the program, and you can retrieve it at any time. Many programs use a network of banks to spread your balance across several institutions, which can increase the total FDIC coverage available to you.

Money Market Fund Sweeps

The other destination is a money market mutual fund. Instead of depositing your cash at a bank, the brokerage uses it to buy shares in a fund that holds short-term, low-risk debt such as Treasury bills, government agency securities, or high-quality commercial paper. Money market funds aim to maintain a stable share price of one dollar, though that value is not guaranteed.

Government money market funds invest almost exclusively in U.S. government securities and are the lower-risk option. Prime money market funds invest in short-term corporate and bank debt, which carries slightly more credit risk but often offers a higher yield. Your firm’s sweep disclosure specifies which type of fund is used. Some firms also offer municipal money market fund sweeps whose income may be exempt from federal (and sometimes state) tax, though yields on those tend to be lower.

Insurance Coverage for Swept Cash

The protection on your swept cash depends on where the money is sitting at any given moment. The two frameworks don’t overlap.

SIPC at the Brokerage

Cash held in your brokerage settlement account, before it is swept out or after it is swept back in, falls under the Securities Investor Protection Corporation. If your brokerage firm becomes insolvent, SIPC protects your assets up to $500,000 total, with a $250,000 limit on cash claims.³ SIPC does not protect you against investment losses. It only steps in if the firm fails and your assets go missing.

FDIC at Partner Banks

Once your cash is swept into a deposit account at a partner bank, SIPC no longer applies. Instead, the Federal Deposit Insurance Corporation insures those deposits up to $250,000 per depositor, per insured bank, for each account ownership category.⁴ Sweep programs that distribute your cash across a network of partner banks can extend FDIC coverage well beyond the single-bank limit, so long as no one bank in the network holds more than $250,000 of your money.

Because the brokerage, not you, places the money at the partner bank, this coverage only reaches you through what the FDIC calls “pass-through” insurance. Three conditions must be met. The funds must actually be owned by you, not by the brokerage placing them. The bank’s records must show the account is held in a custodial or agency capacity, such as “XYZ Brokerage FBO Customers.” And either the bank’s or the brokerage’s records must identify you as the owner and show your share of the deposit.⁵ If any condition is not satisfied, the FDIC would treat the entire deposit as belonging to the brokerage, and your share could end up uninsured. Reputable sweep programs are designed to meet all three, but it’s worth confirming in the sweep disclosure.

Money Market Fund Sweeps Are Not Insured

If your sweep vehicle is a money market mutual fund, neither FDIC nor SIPC protects the value of those fund shares against loss. Money market funds are securities, not deposits. They are generally considered low-risk, but they can lose value, as happened during the 2008 financial crisis when a major fund’s share price fell below one dollar. SIPC would help return fund shares in your account if the brokerage itself failed, but it would not make up for any decline in the share price.

Why Sweep Rates Vary and Why That Matters

Not all sweep programs pay the same rate, and the differences can be large. Some brokerages pay yields that closely track the federal funds rate. Others pay a fraction of a percent on swept cash even when short-term market rates are several percentage points higher. On a balance of $50,000, the gap between a high-paying and low-paying program can easily exceed $2,000 per year.

The reason is the spread. A brokerage might receive a competitive overnight rate from a partner bank but credit your account with only a small fraction of that amount, keeping the difference as revenue. Some bank sweep programs also charge account maintenance fees, asset-based fees, or transaction fees.¹ Money market fund sweeps instead disclose their costs as an expense ratio and generally pass the remaining yield through to shareholders, which is why they often pay more than bank sweeps at the same firm in a rising-rate environment.

Regulators treat these arrangements as a potential conflict of interest. The SEC requires broker-dealers to disclose all material facts about conflicts tied to a recommendation, and cash sweep programs are specifically named as an example.⁶ Under Regulation Best Interest, broker-dealers must also consider the total cost of their account recommendation, including indirect costs from sweep programs, and have a reasonable basis to believe the recommendation is in the client’s best interest.⁷ In 2024, the SEC charged a dually registered adviser and broker-dealer with failing to disclose revenue-sharing payments it received on clients’ money market fund holdings in sweep accounts, and ordered the firm to pay over $6 million in disgorgement and penalties. If your firm’s disclosure is vague about how it profits from the arrangement, that’s a reason to ask questions.

How Sweep Income Is Taxed

Sweep earnings are taxable income in the year you receive them, but the form you get depends on the vehicle.

Interest earned on deposits at partner banks is reported on Form 1099-INT. The brokerage or partner bank issues it if you earn at least $10 in interest during the year.⁸
Distributions from money market mutual funds are classified as dividends, not interest, and are reported on Form 1099-DIV in Box 1a (total ordinary dividends). The IRS specifically notes that dividends from money market funds should not be confused with interest from bank money market accounts.⁹¹⁰

In either case, sweep income is generally taxed as ordinary income at your marginal federal rate. Income from a municipal money market fund sweep may be exempt from federal income tax, and sometimes state tax depending on the underlying holdings. Whether that offsets the lower yield depends on your bracket.

Reading Your Statements and Changing Your Option

Your monthly brokerage statement shows specific line items for each sweep movement. Look for entries labeled “sweep out” and “sweep in,” plus a net cash balance showing the total currently held in the program and the interest or dividend income earned during the period. Your firm must also provide a written sweep program disclosure identifying the participating banks or funds, how the interest rate is determined, any fees, and the priority order in which banks receive deposits. The firm must give you 30 days’ written notice before changing the terms, conditions, or products available in the program.¹ Each partner bank in a sweep network must separately disclose whether your swept funds qualify as “deposits” under federal law and, if not, what would happen to those funds if the bank failed.¹¹

Being enrolled in the default sweep does not lock you in. You can move your uninvested cash to a different option at any time.¹² Typical alternatives include switching from a bank sweep to a money market fund sweep (or the reverse), purchasing short-term Treasury bills directly, or moving idle cash to a high-yield savings account at an outside bank. When comparing, three things matter:

Yield. Compare the APY or seven-day yield of your current sweep with other options. Small differences compound quickly on larger balances.
Insurance. Bank sweeps carry FDIC coverage; money market fund sweeps don’t. If deposit insurance matters, check how many banks are in the network and whether your balance stays under $250,000 at each.
Liquidity. Most sweep vehicles allow same-day access for trades. Buying Treasury bills or moving money to an outside bank can introduce a delay of one or more business days.

To see what you are currently earning and what else your firm offers, check your account agreement, review your most recent statement, or contact your financial professional directly.

1
U.S. Securities and Exchange Commission. Cash Sweep Programs for Uninvested Cash in Your Investment Accounts – Investor Bulletin
2
FINRA. Understanding Settlement Cycles: What Does T+1 Mean for You
3
Office of the Law Revision Counsel. Title 15 – Commerce and Trade, Chapter 2B-1 – Securities Investor Protection
4
Office of the Law Revision Counsel. 12 U.S.C. Chapter 16 – Federal Deposit Insurance Corporation
5
FDIC. Pass-through Deposit Insurance Coverage
6
U.S. Securities and Exchange Commission. Staff Bulletin: Standards of Conduct for Broker-Dealers and Investment Advisers Conflicts of Interest
7
U.S. Securities and Exchange Commission. Staff Bulletin: Standards of Conduct for Broker-Dealers and Investment Advisers Account Recommendations for Retail Investors
8
Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
9
Internal Revenue Service. Instructions for Form 1099-DIV
10
Internal Revenue Service. Publication 550, Investment Income and Expenses
11
Office of the Comptroller of the Currency. OCC Bulletin 2009-19: Revision to FDIC Rule 12 CFR 360 – New Notice Requirements for Sweep Accounts
12
FINRA. Don’t Lose Interest: Managing Cash in Your Brokerage Account