Brokerage Cash Sweeps: Bank Deposits, Money Market Funds, and SIPC

A sweep is the account instruction or program that handles cash not currently invested in securities. It can apply to money you transfer in, dividends and interest, sale proceeds, or cash waiting to be reinvested. A broker may set a default automatically when you open an account; the default can be a bank sweep, a money market fund, or a free credit balance. The SEC recommends checking which options your firm offers, which option is selected by default, and how to change it (SEC cash-sweep investor bulletin).

The word “cash” on a screen describes a balance or buying-power function, not necessarily the asset behind it. After a sweep, the legal claim might be a deposit at a named bank, mutual-fund shares, or an amount payable by the brokerage. Before comparing an interest rate, identify who owes you the money and what your account statement says you own.

Under a bank sweep, the brokerage arranges for uninvested cash to be placed in deposit accounts at participating banks. The deposit is a liability of the receiving bank, even if the brokerage shows one combined balance. Some programs distribute cash among several banks; others use one. The disclosure should list the banks or explain how the program identifies them, how allocation works, whether you can exclude a bank, and what happens when a bank reaches its program limit (SEC cash-sweep investor bulletin).

FDIC coverage is generally up to $250,000 per depositor, per insured bank, per ownership category. Your other eligible deposits in the same category at the same bank are added to the sweep amount. For example, if you already have $180,000 in individual savings at Bank A and a sweep places another $90,000 there in the same ownership category, the illustrative total is $270,000; $20,000 is above the standard limit, assuming the deposits and records qualify. A separate bank charter can have a separate limit, but a different brand name or branch does not automatically mean a different insured bank. Check the legal bank name and use the FDIC’s current coverage tools (FDIC deposit-insurance guide).

When a broker or agent holds a deposit for customers, pass-through treatment depends on the applicable account titling and records identifying each owner and that owner’s interest. A brokerage display or marketing phrase such as “FDIC insured sweep” is not a substitute for checking the participating bank, existing deposits, ownership category, and program records. FDIC insurance addresses an insured-bank failure for eligible deposits; it does not insure a brokerage, a money market fund, or every amount displayed as cash.

A money market fund sweep invests the cash in shares of a mutual fund that holds short-term securities. Government funds, prime funds, and tax-exempt funds can hold different assets; the fund name alone does not reveal every exposure. Some government funds seek to maintain a stable share price, often $1, while institutional prime funds use a floating net asset value. A stable-price objective is an accounting and pricing convention, not a promise that the value cannot fall. The SEC describes these categories and their risks in its money market fund bulletin.

Money market fund shares are not bank deposits and are not FDIC-insured. A government fund is not itself a U.S. government-guaranteed account. Its portfolio may include government securities and repurchase agreements, and it remains an investment fund with operating, liquidity, and market risks. Read the current prospectus for portfolio type, share class, expenses, minimums, redemption terms, and whether any liquidity fee may apply. Do not confuse a money market mutual fund with a bank money market deposit account (FDIC, understanding deposit insurance).

Some firms leave idle cash as a free credit balance instead of sweeping it to a bank or fund. The balance is then an amount the brokerage owes under the customer-account arrangement. It may earn little or no interest, and the firm’s terms determine how it is held, used, and made available. The SEC says customers should ask whether a free credit balance earns interest and whether another sweep option is available (SEC cash-sweep investor bulletin).

SIPC protection concerns missing customer cash or securities if a SIPC-member brokerage fails and enters liquidation. It is not FDIC insurance and does not reimburse market losses in a money market fund. Whether a particular free credit balance or fund share qualifies depends on the account, the asset, and the claim; read the disclosures rather than treating the SIPC logo as a value guarantee (SIPC, what it protects).

Think first about the institution that owes or holds the asset. FDIC insurance can cover eligible deposits at an FDIC-insured bank, subject to ownership and aggregation rules. SIPC can help restore missing customer property in a failed member brokerage’s liquidation, subject to statutory limits and eligibility. Neither program is a promise that an investment will keep its market value, and SIPC does not insure a bank sweep deposit against the partner bank’s failure. The FDIC explicitly excludes mutual funds and other securities from deposit insurance; SIPC says it does not protect declines in security values (FDIC deposit-insurance guide; SIPC protection overview).

For a fund sweep, separate two questions: could the fund’s shares lose value, and could shares be missing if the broker fails? A SIPC claim may address the second question, not the first. For a bank sweep, ask whether an eligible deposit is actually recorded at an insured bank and whether your interest is identifiable. For a free credit balance, inspect the brokerage’s cash and customer-protection disclosures. The label “protected” is incomplete unless it names the institution, event, asset, and limit involved.

A higher displayed number does not automatically mean a higher comparable return. A bank program may quote an APY; a fund may display a seven-day yield that annualizes recent income. Rates can change, a fund’s net yield may reflect a temporary expense waiver, and account or fund fees can reduce what you keep. The 7-day yield guide explains that quote separately; this article focuses on where swept cash goes.

For scale only, suppose $25,000 stays for 30 days at a constant hypothetical annualized 0.40% bank rate or 4.00% fund rate. A simple 30/365 estimate gives $25,000 × 0.004 × 30 ÷ 365 = about $8.22 for the bank option, and $25,000 × 0.04 × 30 ÷ 365 = about $82.19 for the fund, a difference of roughly $73.97 before fees and tax. These are invented rates, not current offers. The approximation does not convert APY and seven-day yield into identical measures, model daily compounding, or predict a distribution; the actual rate and balance can change during the month.

A useful comparison records the rate type and date, share class, net or gross basis, waiver expiry, minimum, account charge, and expected time in the sweep. If cash will sit only briefly, a one-year annualized headline may exaggerate the practical dollar difference. If the balance is large, also compare how it is allocated across banks and what happens when one partner bank is already at its cap.

A bank sweep, a fund redemption, and a brokerage credit balance can appear equally available in an app while following different processing steps. Trade buying power, cash that can be withdrawn to a bank, and cash that has settled are not always the same. Check cutoff times, weekends and bank holidays, transfer holds, minimums, and whether a redemption must occur before an order or withdrawal. The broker’s agreement and fund prospectus control the specific account (SEC cash-sweep investor bulletin).

Money market fund rules also matter during stress. The SEC’s 2023 reforms removed the former temporary redemption gates tied to liquidity thresholds and revised liquidity-fee requirements. Institutional prime and institutional tax-exempt funds generally must impose a fee when daily net redemptions exceed 5% of net assets, subject to the rule’s de minimis-cost exception; non-government funds also have a discretionary-fee framework. The exact operation depends on current rules and the fund’s documents, so do not assume every fund charges a fee or that a liquidity threshold means withdrawals are automatically blocked (SEC money market fund reforms; SEC investor bulletin).

Open the account’s cash-management page, sweep disclosure, and most recent statement. Record the default option, the legal bank or fund name, how the rate is quoted, any minimum or fee, transfer timing, and how to opt into another available option. For a bank program, add the sweep allocation to your own deposits at each bank and ownership category. For a fund, check its type, current portfolio, share class, expenses, redemption terms, and prospectus. For a free credit balance, confirm whether it earns interest and how the firm describes customer-property protection.

Choose the comparison that fits the job the cash must do, rather than treating one label as universally best. If a maturity date matters, see the Treasury bill ladder guide. For how bank rates respond to policy changes, read bank deposit beta; for the issuer, maturity, liquidity, and yield differences among short-term debt instruments, see Commercial paper vs. Treasury bills. These guides explain mechanics, not personal suitability or a specific brokerage’s current offer.