Two cash products share a name and very little else. A money market account is a deposit at a bank or credit union, protected by federal deposit insurance. A money market fund is a mutual fund sold by an investment company, regulated by the SEC and backed by no deposit insurer. The gap shows up when a bank fails, when interest rates move and when tax forms arrive. This comparison lines the two up feature by feature, works out what the yield gap and the insurance limit mean in dollars, and sets out which jobs each one suits. For the rest of the low-risk menu, see the safe investments hub.
What is the difference between a money market fund and a money market account?
A money market account is an insured bank deposit paying a rate the bank sets; a money market fund is an uninsured investment paying what its holdings earn.
The bank product's formal name is a money market deposit account, or MMDA, and credit unions offer similar accounts insured by the NCUA. The fund buys Treasury bills, repurchase agreements and other debt that matures within days or months, and our guide to how money market funds work covers the SEC rules it must follow. The IRS spells out the distinction in Publication 550: money market funds "are a type of mutual fund and should not be confused with bank money market accounts that pay interest."
| Feature | Money market account | Money market fund |
|---|---|---|
| What you own | A deposit the bank owes you | Shares in a fund that owns short-term debt |
| Protection | FDIC or NCUA insurance up to $250,000 per depositor, per institution, per ownership category | No deposit insurance; SIPC replaces missing shares if a brokerage fails, but not lost value |
| Regulator | Bank and credit union regulators | The SEC, under Rule 2a-7 |
| Where the yield comes from | A rate the bank chooses and can change at any time | Interest on the fund's holdings, minus its expense ratio |
| How the yield is quoted | Annual percentage yield (APY) | 7-day SEC yield |
| Benchmark, October 2026 | 0.63% national average | Close to the 4.08% 13-week bill yield, less expenses |
| Fees | Set by the bank, such as monthly or excess-withdrawal fees | Expense ratio taken from income; liquidity fees possible on heavy redemption days |
| Access | Transfers, often checks or a debit card; the bank may cap withdrawals | Shares sold on any business day, then cash moved to a bank |
| Minimums | Set by each bank, often with rate tiers by balance | Set by each fund, share class or brokerage |
| Tax form | Form 1099-INT | Form 1099-DIV |
Which one is FDIC insured?
Only the money market account: the FDIC insures money market deposit accounts like other deposits, and lists money market mutual funds among the products it does not cover.
Bank deposit insurance covers $250,000 per depositor, per insured bank, per ownership category, and credit union accounts are protected by the NCUA at $250,000 per share owner, per insured credit union, for each account ownership category. Coverage is automatic whenever a deposit account is opened at an insured bank. Joint, trust and retirement accounts are separate ownership categories with their own limits, which the FDIC insurance guide explains.
A fund is protected in a different way. Its shares are securities, so if the brokerage holding them fails and they go missing, SIPC restores up to $500,000 per customer, including up to $250,000 in cash. SIPC states that money market mutual funds, often thought of as cash, are protected as securities, but it does not protect against a decline in their value. Inside the fund, the safeguard is the portfolio itself and the SEC's limits on what it can own. The FDIC vs SIPC guide sets the two systems side by side.
Worked example: Parking $400,000 for six months
A single owner has $400,000 from a home sale and no other accounts at the bank.
- In one money market account: $250,000 is insured and $400,000 − $250,000 = $150,000 is not
- In two money market accounts at separately chartered banks, $200,000 each: the full $400,000 is within the limit
- In a government money market fund: none of it is FDIC insured; its protection is what the fund owns, at least 99.5% in cash, government securities and fully collateralized repurchase agreements
- If the brokerage itself failed with shares missing, SIPC would cover up to $500,000 of securities for this customer
Some brokerages spread customer cash across several partner banks to multiply coverage, which is how many sweep programs work; cash sweep accounts covers how to tell what you have.
Which pays more interest?
In late 2026 money market funds paid far more than the average money market account, because fund yields track bill and repo rates while banks set their own.
The FDIC's national average for money market deposit accounts was 0.63% (FDIC, as of Nov 1, 2026). It is weighted by each bank's share of deposits, so the many large banks that pay little pull it down. On October 30, 2026, the 13-week Treasury bill's investment yield was 4.08%, with the federal funds target at 3.75% to 4.00%. A government fund earns roughly what its bills and repos earn, then subtracts its expense ratio. Rates at individual banks range far above and below the average, so compare a specific bank's APY with a specific fund's 7-day yield.
The two quotes use different conventions. A bank's APY includes compounding; a fund's 7-day SEC yield does not. To put a fund on the same footing, compound its weekly rate: a 3.90% 7-day yield works out to about 3.98% a year if rates hold. The APY vs APR guide explains the bank side.
Worked example: One year on $25,000, ignoring compounding
- Money market account at the 0.63% national average: $25,000 × 0.0063 = $157.50
- Money market fund at an illustrative 3.90% yield: $25,000 × 0.039 = $975.00
- Difference before tax: $975.00 − $157.50 = $817.50
- After a 24% federal tax on both: $119.70 against $741.00, a gap of $621.30
Neither figure is fixed. The bank can change its rate whenever it likes, and the fund's yield resets as its holdings mature, so it would fall within weeks of a Fed rate cut.
How do fees and minimums differ?
Banks charge account fees and set balance tiers, while a fund takes its costs out of income as an expense ratio and may add a liquidity fee during heavy redemptions.
A money market account's disclosures list its minimum opening deposit, any monthly maintenance fee and the balance that waives it, and the rate tiers. The FDIC's national money market average itself blends rates quoted at $10,000 and $100,000 balances. Some accounts also charge for withdrawals beyond a set number each month, so the fee schedule matters as much as the headline rate.
A fund's costs come out before you see the yield. The expense ratio in the prospectus fee table is deducted from income every day, so a fund earning 4.10% on its holdings with a 0.40% expense ratio pays 3.70%. Minimum initial investments are set by each fund and share class, and brokerages may add their own. Government funds, which held about $6.50 trillion of the $7.90 trillion in US money market funds in late October 2026 according to the Investment Company Institute, do not have to charge liquidity fees; institutional prime and tax-exempt funds must charge one on heavy redemption days.
How fast can you withdraw from each?
Both are built for quick access, but a bank account pays out directly, while fund shares must first be sold before the cash can move.
Money market deposit accounts often come with checks or a debit card, and transfers to checking at the same bank can be immediate. Until 2020, the Federal Reserve's Regulation D capped convenient transfers and withdrawals from savings deposits, including these accounts, at six a month. An interim final rule on April 24, 2020 deleted that cap and let banks stop enforcing it, but nothing forces a bank to drop its own limit, so check the account terms for a monthly cap or an excess-withdrawal fee.
Fund shares are sold back to the fund at the next share price it calculates, on any business day. At a brokerage, the proceeds land in your cash balance and then need a bank transfer to reach checking, so allow for that step before a bill falls due. Holding a fund at the same firm as your checking account can shorten the trip.
How are the payouts taxed?
Both are generally taxed as ordinary income, but the IRS treats fund payouts as dividends on Form 1099-DIV and bank money market earnings as interest on Form 1099-INT.
Publication 550 says amounts received from money market funds should generally be reported as dividends, not as interest, even though the fund's own income is interest. Credit unions run the other way: they call their payouts dividends, but the IRS says those so-called dividends are really interest, reported on Form 1099-INT. Because the fund's income is interest, its dividends generally do not get the lower rates that apply to qualified dividends from stocks.
Two details can change the bill. Tax-exempt money market funds pay exempt-interest dividends, shown in box 12 of Form 1099-DIV, and any part subject to the alternative minimum tax appears in box 13; bank accounts have no equivalent. And interest on Treasury bills is exempt from state income tax when you own the bills, as are T-bills taxable explains, but whether that carries through a fund's dividends depends on your state. Bank interest gets no such break. A tax professional can confirm how your state treats fund dividends.
What are the risks of each?
The account's main risks are a low or falling rate and balances above the insurance limit; the fund's are a small chance of loss, liquidity fees and no insurance.
- Uninsured balances, account. Anything above $250,000 per depositor, per insured bank, per ownership category in one ownership category at one bank is exposed if the bank fails, as the $400,000 example shows.
- Rate risk, both. A bank can cut an account's rate at any time, and a fund's yield falls within weeks of a Fed cut as its holdings roll over.
- Losing ground to inflation, both. Consumer prices rose 3.74% in the year to September 2026, so an account at the 0.63% average lost buying power; the real returns guide shows how to measure the after-inflation result.
- Breaking the buck, fund. The $1.00 share price is a target. The Reserve Primary Fund fell to $0.97 in 2008 after Lehman Brothers failed, and the sponsor of a fund is not required to cover losses. Government funds carry far less credit risk than prime funds.
- Fees and frozen redemptions, fund. Prime and tax-exempt funds can charge liquidity fees when many investors leave at once, and a fund that liquidates can suspend redemptions while it sells assets.
- Mixing them up, both. When one firm offers both, check whether each account is a deposit or a security before moving money; the FDIC's BankFind tool confirms whether a bank is insured.
For how these fit with credit, liquidity and market risk more broadly, see types of investment risk.
Which one fits which use?
The better fit depends on the job the cash has to do, how large the balance is and whether the money already sits at a bank or a brokerage.
- Spending money and bills: an account, since checks, a debit card and same-bank transfers reach the money fastest.
- An emergency fund: often both, with the first slice in an insured account and the rest where it can earn more; where to keep an emergency fund works through a split.
- Cash waiting to be invested at a brokerage: usually a fund or the broker's sweep, since that is where trades settle.
- Balances well above $250,000: a government fund or Treasury bills avoid juggling several banks, at the cost of deposit insurance; T-bills vs money market funds compares those two.
- High tax brackets: a tax-exempt fund can beat both on an after-tax basis, and the fund guide shows the tax-equivalent yield math.
If neither fits, a high-yield savings account is the money market account's close cousin: also insured, and often offered by online banks.