Money Market Sweep Accounts: How They Work in a Brokerage

Money market sweep accounts tell a brokerage where to put cash you have not invested yet. That cash can be a deposit you transferred in, a dividend, interest, or the proceeds of a sale that is waiting for the next purchase. The firm moves it under the program you picked when you opened the account, or under a default if you never picked one.

The cash lands in a money market fund, a bank deposit, or a balance left at the broker. The default at many firms is a bank sweep, and bank sweep programs often pay less interest than money market fund sweeps. This page separates the three options, puts a real rate card under the bank column, and walks through the insurance and the lines to read on your own statement.

Where Uninvested Cash Goes After a Sale

When a sale settles, or a dividend posts, the cash does not have to sit still until your next order. The firm applies a cash sweep program, which is the automatic transfer of that uninvested cash into the option tied to your account. You do not place a separate trade each evening to make the transfer happen.

CASH THAT CAN BE SWEPT

• Deposits: Money you move in from a bank before you buy anything.
• Payouts: Dividends and interest from investments already in the account.
• Sale proceeds: Cash from a sale you have not reinvested yet.

Some programs add check writing, electronic bill payment, or a debit card, and those extras belong to that program alone, so the account agreement is the list that counts. A brokerage sweep is also a different tool from a bank service that skims a checking account down to a target balance you set for bills. In the brokerage case, the firm sweeps the uninvested cash, and you are not asked to leave a cushion earning nothing.

When you buy a security or withdraw money, the sweep runs back the other way and the cash is there to fund the transaction. The balance still looks available, which is why a thin rate can stay in place for months without a rejected order to flag it. Many firms enroll you in a default if you do not choose, and you can still move the money later, including to an account outside the firm.

Money Market Fund Sweeps, Bank Sweeps, and Free Credit Balances

A Money Market Fund Sweep Buys Shares

A money market fund sweep takes the idle cash and buys shares of one or more money market funds. Those funds are mutual funds that hold high-quality, short-term debt, such as Treasury bills, and they pay dividends that reflect short-term interest rates. They have lower risk than most other mutual funds, and they are still funds.

A money market deposit account at a bank can be FDIC-insured. A money market fund has no FDIC insurance, a line the SEC’s cash sweep investor bulletin draws between the fund and a bank product. After you sell an investment and do not buy another, that cash becomes shares of the fund. The screen can still look like a cash balance, but you own shares until they are sold for the next trade or a withdrawal.

A Bank Sweep Moves Cash Into Deposit Accounts

A bank sweep moves the same uninvested cash into a deposit account at one or more banks. The bank may belong to the same corporate family as your firm, or it may not. Interest is variable, and the terms differ from one program to the next.

WHAT THE BANK PROGRAM CHANGES

• The deposit: You hold a bank deposit, not shares of a fund.
• The firm’s fee: Most broker-dealers keep a portion of the interest the banks pay, and that fee cuts the rate you receive.
• The pick: Banks may be chosen for what they pay the firm, or because they are affiliated with the firm.

That fee is why the rate on a bank sweep can lag a money market fund offered in the same relationship. Broker-dealers may choose banks based on what the banks pay the firm, on an affiliation, or on another business relationship, which the SEC bulletin on bank sweep programs says to review before you assume the pick was made for you. You can liquidate the bank sweep at any time and have the money returned to you or placed back in the brokerage account.

Cash Left as a Free Credit Balance

Cash that is not swept into a fund or a bank stays at the brokerage as a free credit balance. Some firms pay interest on that balance and others pay none, so ask which one your account uses before you treat the line as savings. This is the third option in the same menu, not a leftover the firm forgot.

THREE QUESTIONS FOR THE FIRM

• The rate: Does this balance earn interest, and what is the rate today?
• The switch: Can this account use a fund sweep or a bank sweep instead?
• The purpose: Is the cash here so you can buy securities, or only so it can earn interest?

Cash left at the broker so you can buy securities can fall under SIPC. Cash placed there only to earn interest does not, which is why the purpose question matters before you park a large balance with no sweep. If the cash will be invested within days, a free credit balance can be a simple holding pen once you know whether those days earn anything.

The three options put side by side make the statement easier to read. Match the line on your account to a row, then use the fit list under the table.

WHICH OPTION FITS

• Bank sweep: You want FDIC coverage and you will watch the total at each bank.
• Fund sweep: You want dividends that reflect short-term rates, and you accept that the shares are not a deposit.
• Free credit balance: The cash will be invested soon, and you have asked whether it earns interest while it waits.

You can want FDIC coverage and still reject the default rate. In that case an account outside the firm, such as a high-yield savings account, is the path to compare, and you transfer money back when you are ready to buy. The rate card in the next section shows how wide that comparison can get at a single firm.

Rates on a Default Bank Sweep

The figures in the table come from E*TRADE’s published sweep rate page, which lists the Bank Deposit Program as the only sweep vehicle for most clients. Money market fund sweeps on that page are for accounts that are not eligible for the bank program. Most clients never land in the fund column unless the account is ineligible or the cash balance is very large.

The example below puts $10,000 into the bottom bank tier and into MGPXX’s seven-day effective yield, and it assumes that yield does not change for a full year. MGPXX is the Morgan Stanley government fund the page names for ineligible accounts and for those very large balances.

A $10,000 BALANCE FOR A YEAR

• Bank sweep: At the 0.01% APY, $10,000 earns $1 in a year.
• Fund yield: If the 3.58% seven-day effective yield held for a year and dividends were reinvested, $10,000 would earn $358.
• The difference: That gap is $357, and it comes from the rate on the cash, not from owning stocks.

The dollar lines use the seven-day effective yield, which the rate page defines as an annualized net yield that assumes dividends are reinvested at the average rate over the last seven days. The seven-day current yield on the same page is the average income return over those seven days after fund expenses. Neither figure is a promise that the yield will sit still for the next year, and the bank APY can change as well.

A rate card like this is the check worth doing at your own firm, even when the brands and the tickers differ. Some accounts already use a government money market fund as the core position, so idle cash earns the fund yield without an extra order. Where the default is the bank program, the fund is a separate choice you have to ask for, and only if that account is allowed to use it.

FDIC and SIPC Rules for Swept Cash

The $500,000 step on the E*TRADE card is a rate tier, not an insurance line. FDIC coverage and SIPC protection answer different failures, and neither one insures you against a bad trade.

FDIC insurance pays if an insured bank fails. On a bank sweep, coverage is up to $250,000 per customer at each participating FDIC-insured bank, for each ownership category. Some firms spread the cash across several banks, which can cover a larger total because each bank has its own limit.

You still have to know how much landed at each bank. Most broker-dealers leave that watching to you, and cash over the limit at a single bank is not insured even when the account as a whole looks covered. You can add a program bank to the deposits you already hold there with the FDIC deposit insurance estimator. If the firm offers an alert when a balance nears the limit, turn it on, because the statement is the record of how the cash was split.

SIPC LIMITS THAT APPLY TO A BROKER

• The total: SIPC can advance up to $500,000 per customer to cover a shortfall in customer property.
• The cash cap: That total includes a $250,000 limit for cash claims.
• Fund shares: Money market mutual funds are protected as securities, not as cash.
• Value drops: SIPC does not protect you against a decline in the value of your securities.

Cash swept into a money market fund, and cash left as a free credit balance for securities trades, may be protected by SIPC if the firm is a member and fails. Read what SIPC protects for customers before you treat a fund balance as if it were a bank deposit. A bank-sweep deposit is outside that protection, because the cash is a deposit at the program bank and the banking rules, including FDIC insurance, are what apply.

How to Change a Money Market Sweep Account

If you are at a broker-dealer, the firm has to give you 30 days’ written notice before it changes the terms, conditions, or products in the cash sweep program. That notice is a deadline to read the new option. It is not a promise that the replacement pays more. On an advisory account, the advisory agreement and the Form ADV brochure are where the sweep should be described.

1. Open the latest statement and find the cash, sweep, or core position line. Write down the product name, not only the word cash.
2. Match that name to a bank deposit program or to a money market fund ticker on the firm’s rate page.
3. Read the rate for that product, then read the rate for any other cash option the agreement still allows on this account.
4. If you are at a broker-dealer, note the 30 days’ written notice the firm must send before it changes the sweep.
5. If the cash is in a bank sweep, list the program banks and add any deposit you already hold at those banks in the same ownership category.
6. Ask the firm how to switch, what minimum balance applies, and whether a maintenance fee, a withdrawal fee, or an asset-based advisory fee changes when the cash stays put.
7. If none of the firm’s options pay a rate you would accept, keep the extra cash in an account outside the firm, such as a high-yield savings account, and transfer it in when you are ready to invest.

The options can differ by account, so a taxable account and an IRA at the same firm each need their own check. Some programs require a minimum balance before you can join or before you earn a better rate. An asset-based fee, which is tied to the size of the account, can rise when a large cash balance stays inside an advisory account, so the amount you keep is the sweep rate minus that fee.

Common Mistakes With Money Market Sweep Accounts

The easiest miss is the shared name. A money market deposit account is a bank product, and a money market fund is a mutual fund. A sweep line that uses the words money market can be either one, and only the bank product can carry FDIC insurance. Read the description under the nickname, and look for a fund ticker or a bank program name.

The next miss is treating the default as the firm’s best cash rate. The default is the option you receive when you do not choose, and at many firms that option is the bank sweep. The fund, on accounts that are allowed to use it, is often a separate choice you have to request. Leaving the default untouched keeps the thinner rate in place.

Two balance mistakes sit under the rate. Deposits you already hold at a program bank, in the same ownership category, share the FDIC limit with the swept cash, and the firm leaves the watching to you. On an advisory account, a large idle balance can also raise the asset-based fee while it earns the sweep rate, so the cash is paying the adviser for sitting still.

Frequently Asked Questions

Can a Money Market Fund Sweep Lose Value?

Most retail and government money market funds try to hold a steady price of $1 a share, while some funds use a floating price that moves with the value of what they hold. If a stable fund’s price moves by more than half a cent from $1, the fund has to reprice the shares, and the SEC’s money market fund bulletin calls that breaking the buck. The shares are then worth less, and SIPC does not repay that loss, because SIPC does not cover a decline in the value of a security.

Is Swept Cash Ready When You Buy a Stock?

You can liquidate a bank sweep at any time and have the money sent back to you or placed in the brokerage account. A money market fund sweep is a holding of shares, so ask the firm whether those shares must be sold before the cash can pay for a purchase. The account agreement sets that timing.

What Happens If One Program Bank Fails?

FDIC insurance is there for that bank’s failure, up to the limit at that bank, and it is backed by the full faith and credit of the United States government. Coverage for a bank sweep comes from banking rules, not from the brokerage. SIPC is not the backstop for that deposit, because the cash is no longer property held at the broker.

Are Cash Management Services the Same as a Sweep?

No. Some advisers offer a separate service that actively manages cash and short-term investments inside the account. The SEC’s cash sweep bulletin treats that service as different from the automatic sweep programs on this page. If your agreement mentions both, ask which one is moving the cash and what it costs.

The decision sits on one line of your next statement. Write down the product name and the rate, compare both with the firm’s other cash option and with a savings account you could open on your own, and ask for a switch if the line is a default you never chose.

Disclaimer: This article is an educational guide to money market sweep accounts and is for information only. It is not investment, tax, or legal advice, and it is not a recommendation to use any brokerage, bank, or fund. Talk with a qualified financial professional, and with your brokerage firm, before you change a sweep, move cash, or rely on a rate or an insurance limit. Rates, program banks, fees, and rules reflect the sources reviewed here and can change.