A money market account and a money market fund share nearly the same name but are fundamentally different products. One is a federally insured bank deposit; the other is a mutual fund with no FDIC protection. Confusing the two is one of the most common banking mistakes. Here is a complete comparison.
The Key Difference in One Sentence
A money market account is a bank deposit account — FDIC insured up to $250,000. A money market fund is an investment product — not FDIC insured, but designed to maintain a stable $1.00 per share value.
Side-by-Side Comparison
| Feature | Money Market Account | Money Market Fund |
|---|---|---|
| Offered by | Banks, credit unions | Brokerages, mutual fund companies |
| Product type | Deposit account | Mutual fund (investment) |
| Regulated by | FDIC / NCUA | SEC |
| FDIC insured | Yes (up to $250,000) | No |
| Principal guarantee | Yes (up to FDIC limit) | No — targets $1.00/share |
| Historical instances of loss | None at FDIC-insured banks | Yes — 2008 Reserve Primary Fund |
| Typical yield (Sept 2026) | ~3.00%–3.90% APY | Confirm current 7-day yield — generally tracks short-term T-bill rates |
| Interest type | APY (variable) | Yield (daily, variable) |
| Access | Transfer, check, debit (varies) | Brokerage account; check/debit at some brokers |
| Best for | Emergency fund, short-term savings | Cash in a brokerage account |
How Money Market Funds Work
A money market fund is a type of mutual fund that invests exclusively in short-term, high-quality debt instruments:
- U.S. Treasury bills
- Commercial paper (short-term corporate debt)
- Repurchase agreements
- Government agency securities
The fund is designed to keep its net asset value (NAV) at exactly $1.00 per share. Every dollar you put in should equal one share worth $1.00. The yield (paid as dividends) represents your return.
The “break the buck” risk: In rare circumstances, a money market fund’s NAV can fall below $1.00 — called “breaking the buck.” This happened with the Reserve Primary Fund during the 2008 financial crisis when it held Lehman Brothers commercial paper. SEC reforms since 2010 and 2016 have strengthened safeguards, but the theoretical risk remains.
How Money Market Accounts Work
A money market account is a savings deposit account at a bank or credit union. The bank invests your deposits in similar short-term instruments but takes on the risk and guarantees your balance. The FDIC provides a backstop — if the bank fails, your deposits are covered up to $250,000.
Your balance never fluctuates. You earn a variable APY that changes with the federal funds rate.
Which Should You Choose?
| Your situation | Better choice |
|---|---|
| Emergency fund or savings you cannot afford to lose | Money market account (FDIC insured) |
| Cash sitting idle in a brokerage account | Money market fund (convenient, slightly higher yield) |
| More than $250,000 to protect | Multiple MMAs or cash management account |
| Maximizing short-term yield (with minor risk tolerance) | Money market fund |
| Simple cash management at a bank | Money market account |
2026 Yield Comparison
| Product | Typical Range (Sept 2026) | FDIC insured |
|---|---|---|
| Best bank money market accounts | ~3.00%–3.90% | Yes |
| Fidelity Government Money Market Fund | Confirm current 7-day yield at fidelity.com | No |
| Vanguard Federal Money Market Fund | Confirm current 7-day yield at vanguard.com | No |
| Schwab Value Advantage Money Fund | Confirm current 7-day yield at schwab.com | No |
| Government money market funds (general) | Generally track short-term T-bill yields (~3.85%-4.36% coupon-equivalent, Sept 2026) | No |
Government money market fund yields move daily with short-term interest rates and are not fixed like a CD — check the fund’s current 7-day SEC yield directly with the provider before comparing. On a $50,000 balance, even a modest yield gap can be worth $100+/year, so it’s worth checking current rates on both sides before deciding whether the premium justifies giving up FDIC insurance.
For how money market accounts work inside a bank, see how does a money market account work. For current national average money market account rates, see national average money market rates. For the full money market hub, see money market hub.
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