Money Market Funds vs Money Market Accounts: The Difference That Matters If Something Fails
They share a name, but one is an insured bank deposit and the other is an uninsured investment. Here is how money market accounts and funds really differ, what happens if something fails and which to use for which money.
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📐 Figures verified Sep 28, 2026 against the FDIC and NCUA on deposit insurance, the SEC's investor guidance on money market funds and its 2023 money market fund reforms, SIPC's description of what it protects and the Federal Reserve's September 16, 2026 decision. Yields in the example are illustrative. How we check numbers →
A money market account is a bank deposit, insured by the FDIC or NCUA up to $250,000. A money market fund is an investment that aims to hold $1.00 a share but isn't insured and can, rarely, lose value. Government funds hold mainly Treasurys and similar assets and are the steadiest. For money you can't risk, the insured account wins; funds often yield a bit more.
Numbers That Matter
| Figure | Amount | Source | Verified |
|---|---|---|---|
| Money market deposit accounts at banks | FDIC-insured up to $250,000 per depositor, per bank, per ownership category | FDIC | Sep 28, 2026 |
| Money market share accounts at credit unions | $250,000 share insurance on the same basis | NCUA | Sep 28, 2026 |
| Money market funds | Not FDIC-insured; they seek a stable $1.00 share price but can lose money | SEC (Investor.gov) | Sep 28, 2026 |
| 2023 money market fund reforms | Removed redemption gates, raised liquidity requirements and added liquidity fees for some funds | SEC | Sep 28, 2026 |
| What drives the yields | Short-term rates; the Fed's range is 3.75%–4.00% since Sep. 16, 2026 | Federal Reserve | Sep 28, 2026 |
Account vs Fund, Side by Side
| Money market account | Money market fund | |
|---|---|---|
| What it is | A bank or credit union deposit | A mutual fund holding short-term debt |
| Protection | FDIC or NCUA insurance up to $250,000 | No deposit insurance; SIPC covers a broker's failure, not investment losses |
| Value | Your balance never falls | Aims for $1.00 a share; could fall below in a crisis |
| Yield | Set by the bank; can lag the Fed | Tracks short-term market rates closely, minus fund expenses |
| Access | Checks, debit, transfers | Sell shares, usually same or next business day |
| State tax | Interest is taxable | Treasury-heavy funds may be partly exempt from state tax |
Government, Prime and Tax-Exempt Funds
- Government funds invest almost entirely in cash, U.S. government securities and repurchase agreements backed by them. They're the steadiest type and most common in brokerage sweeps.
- Prime funds also buy corporate short-term debt, pay a little more and carry a bit more risk. Institutional prime funds have a floating share price.
- Tax-exempt funds hold short-term municipal debt, useful mainly in high tax brackets.
If Something Fails
If a bank fails, the FDIC protects insured deposits, including money market accounts. If a broker fails, SIPC protects customers' securities and cash up to its limits, but not against a fund losing value. The fund itself is separate from the broker. Money market funds have lost their $1.00 value only rarely; the best-known case came in September 2008, when a large prime fund fell below $1.00 after the Lehman Brothers bankruptcy. The SEC's reforms since then, most recently in 2023, raised liquidity requirements and removed the gates that once let funds block withdrawals.
Worked Example: $100,000 of Cash
- Money market account at 3.50%: about $3,500 a year, insured up to $250,000.
- Government money market fund at 3.90%: about $3,900 a year, uninsured but holding mainly Treasurys.
- State tax: if the fund's income came from Treasurys and your state taxes income at 5%, you could save up to about $195 more, depending on the fund's holdings and your state's rules.
Yields are illustrative; check current rates and each fund's holdings.
Decision Rules
If this, then that
- If you can't risk any loss → use an insured money market or savings account, within the limits.
- If you want market-tracking yield → a government money market fund is the steadiest fund choice.
- If you live in a high-tax state → compare Treasury-heavy funds on an after-tax basis.
- If your cash sits at a broker → check whether it's in an insured bank sweep or a money market fund.
- If you hold more than $250,000 → spread deposits across banks or use Treasury bills.
Mistakes to avoid
- Assuming "money market" always means insured.
- Treating SIPC as protection against a fund's losses.
- Chasing a prime fund's small extra yield with emergency money.
- Ignoring fund expenses, which come out of the yield.
- Leaving brokerage cash in a low-rate sweep without checking.
Related: brokerage cash sweeps explains where uninvested broker cash goes; T-bills vs savings vs CDs compares the safe options; FDIC coverage above $250,000 covers large balances; and CD strategy when rates rise covers locking in rates.