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Choose a high-yield savings account if deposit insurance and straightforward bank access matter most. Consider a money market fund if you want an investment held alongside brokerage assets and accept that its value is not guaranteed. They can both hold cash-like savings, but one is a bank deposit and the other is a mutual fund.
What is the difference between a money market fund and a high-yield savings account?
| Factor | High-yield savings account | Money market fund |
|---|---|---|
| Structure | A deposit account at a bank. Confirm the institution and account qualify for FDIC insurance. | A mutual fund investing in liquid, short-term debt securities, cash, and cash equivalents. |
| Protection | Eligible deposits are insured by the FDIC within applicable limits and ownership rules. | Not FDIC-insured; shares can lose value. SIPC protection in a brokerage failure does not insure against market losses. |
| Return | Variable APY set by the provider; check the current rate and conditions. | Variable yield that generally reflects short-term rates; compare current yield after expenses and check the fund type and share class. |
| Access | Withdrawals and transfers depend on the bank and account terms. | Mutual fund shares are generally redeemable on business days, but fund terms and certain stress-related liquidity measures can affect redemptions. |
| Costs and limits | Check minimum balance, eligibility, fees, withdrawal or transfer rules, and promotional conditions. | Check the expense ratio, transaction or account fees, investment minimum, redemption terms, and any applicable liquidity fee. |
Neither product has a universal yield advantage. Rates and terms vary, so compare providers’ current disclosures on the day you decide.
Which one fits the way you need to use cash?
Choose savings for insured emergency cash and bank access
A high-yield savings account can be a straightforward place for emergency savings when deposit insurance and direct access through a bank are priorities. Check that the bank and account are eligible for FDIC coverage, and understand transfer timing, withdrawal terms, fees, and any balance or eligibility requirements.
Consider a fund for cash held with investments
A money market fund may be convenient when you already hold assets at a brokerage and understand that the fund is an investment. Before choosing one, identify its type, compare its current yield after expenses, and read the redemption terms. Convenience does not make fund shares equivalent to an insured deposit.
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Check the default in a brokerage account
Uninvested brokerage cash may be placed in a bank sweep or invested in a money market fund. Do not assume the default earns a competitive rate or has the protection you expect. The SEC recommends comparing sweep options’ rates, costs, risks, and benefits: SEC guidance on cash sweep programs. Review the account agreement and statement to see where cash is held, what it earns, and which protections apply.
What protections apply to each choice?
FDIC coverage applies to eligible bank deposits, not fund shares
The standard FDIC insurance amount is $250,000 per depositor, per insured bank, per account ownership category, according to the SEC’s 2021 brokerage account bulletin. Coverage depends on ownership category and how deposits at the same bank are aggregated; balances above the applicable limit are not insured. Verify your circumstances with the institution or FDIC resources. FDIC coverage can apply to qualifying savings and money market deposit accounts at insured banks.
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A brokerage cash sweep may place funds at participating insured banks, where FDIC coverage remains subject to per-customer, per-bank limits and ownership rules. Spreading deposits across participating banks may increase total coverage depending on your existing deposits and ownership categories. Confirm how the particular sweep works rather than assuming all brokerage cash is a bank deposit.
SIPC protection is not insurance against investment losses
SIPC protection relates to a shortfall in customer property if a SIPC-member brokerage fails, within stated limits; it does not protect against a security’s decline in value and is not a substitute for FDIC insurance on deposits. The SEC explains the distinction in its brokerage account bulletin.
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Money market funds generally seek low volatility, but a stable share price is an objective, not a guarantee. Retail and government funds generally seek to maintain a stable $1 net asset value (NAV). Institutional prime and institutional tax-exempt funds use a floating NAV. The SEC says a fund must reprice if its stable NAV deviates by more than half a cent from $1, and investors can lose money. As the SEC puts it, “Money invested in a money market fund, like money invested in any mutual fund, is not guaranteed by the FDIC like bank accounts are.”
Fund categories matter because they hold different investments:
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- Government funds: The SEC’s November 2024 bulletin describes these as investing at least 99.5% of total assets in specified liquid investments, including cash, government securities, and fully collateralized repurchase agreements.
- Tax-exempt or municipal funds: These generally invest at least 80% of assets in municipal securities whose interest is exempt from federal and/or state income taxes. The tax treatment of distributions depends on the investor and the fund; do not assume every distribution is tax-free.
- Prime funds: These primarily invest in taxable short-term corporate and bank debt, such as commercial paper and certificates of deposit.
SEC staff describes liquidity fees for certain funds under heavy-redemption conditions. In specified circumstances, a fund may also suspend redemptions permanently and liquidate. These are stress-related possibilities to understand in the fund’s terms, not routine restrictions to expect in ordinary conditions. Read the SEC’s November 4, 2024 money market fund bulletin and the fund’s prospectus for applicable details.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you compare before moving cash?
- Confirm the product type and protection. Determine whether you are opening a bank deposit account, buying mutual fund shares, or accepting a brokerage cash sweep. Check the institution, fund, or sweep disclosures.
- Compare current return after costs. For savings, check the APY and its eligibility or promotional conditions. For a fund, check the current yield, expenses, fund type, and share class. Rates change, so compare current disclosures rather than relying on a general claim about which pays more.
- Check access and restrictions. Review bank withdrawal and transfer terms or the fund’s redemption terms, including any applicable liquidity fee.
- Account for fees and minimums. Check savings-account maintenance or balance conditions and fund expenses, transaction or brokerage fees, and minimum investments.
- Consider taxes relevant to you. Tax treatment can vary by account, investor, and fund, particularly for municipal fund distributions. Consult authoritative tax information or a qualified tax professional for your circumstances.
For a broader explanation of the names that are easy to confuse, the CFPB distinguishes a money market deposit account from a money market mutual fund: What is a money market account? A deposit account may have transaction limits or minimum deposit requirements. A money market mutual fund is an investment, not a savings or checking account, even if a fund permits check writing.
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