Yes, a money market account can lose money, but the risk depends on what type of account you hold
A money market account (MMA) at a bank or credit union that is insured by the FDIC or NCUA cannot lose the principal you deposit — that money is protected up to $250,000 per depositor per institution. However, you can lose purchasing power if the interest rate the account pays falls below inflation. You can also lose money if you hold a money market mutual fund instead of a bank account, because mutual funds are not insured and their value fluctuates with the securities they hold.
The distinction matters because the term "money market account" refers to two different products. Most people who open one at their bank get the insured version. But if you buy a money market mutual fund through a brokerage or investment account, you are holding an uninsured investment that can decline in value.
Key Takeaways
- Bank and credit union money market accounts are FDIC or NCUA insured, so your principal cannot be lost to market movements, but inflation can erode its real value.
- Money market mutual funds are not insured and can lose value if the underlying securities decline, even though they are considered low-risk investments.
- Interest rates on bank money market accounts can drop, leaving you with returns below inflation and a net loss in purchasing power over time.
- The account type — whether it is held at a bank, credit union, or brokerage — determines whether your money is protected and what risks you actually face.
How FDIC insurance protects your principal but not your purchasing power
If you open a money market account at a bank, the FDIC insures deposits up to $250,000. This means the bank cannot lose your money through its own failure or bad investments. The bank is required to hold your deposits in low-risk securities — typically short-term Treasury bills, commercial paper, and other instruments that mature quickly.
However, FDIC insurance does not protect you from inflation. If your money market account earns 4.5% per year but inflation runs at 3.5%, your real return is only 1%. If inflation rises above your interest rate, you are losing purchasing power even though the dollar amount in your account stays the same. This is a real loss, but it is not a loss of principal — it is a loss of what your money can buy.
The interest rate your bank offers on a money market account changes over time and is set by the bank, not by you. When the Federal Reserve lowers interest rates, banks typically lower the rates they pay on savings products. Your account balance will not shrink, but the income it generates will.
Money market mutual funds carry real loss risk
A money market mutual fund is a different product entirely. These funds are not bank accounts and are not insured by the FDIC. Instead, they are investment funds that hold a portfolio of short-term debt securities — Treasury bills, commercial paper, certificates of deposit, and similar instruments.
Because a mutual fund's value is based on the market price of the securities it holds, the fund's share price can decline. This is rare for money market funds because they hold very short-term, low-risk securities, but it is possible. In 2008, during the financial crisis, some money market mutual funds "broke the buck" — their share price fell below $1.00 — because the securities they held lost value.
If you own a money market mutual fund and the fund's value drops, you lose money. There is no insurance to recover it. The fund manager may try to stabilize the fund's value, but there is no may provide. This is why money market mutual funds are considered low-risk but not risk-free.
Interest rate risk: when rates fall and your returns shrink
Even in a bank money market account, you face interest rate risk. This is not the risk of losing principal, but the risk that your returns will fall as rates decline. When the Federal Reserve raises rates, banks compete to attract deposits and often raise the rates they offer on money market accounts. When the Fed cuts rates, banks lower their rates too.
If you lock money into a money market account earning 4.5% and rates then fall to 2%, you are stuck earning 2% on new deposits while inflation may be running higher. You have not lost money, but you are earning less than you expected. If you need the money and rates have fallen, you may regret not moving it to a longer-term CD when rates were higher.
This is why money market accounts are considered flexible but lower-yielding compared to certificates of deposit (CDs). A CD locks in a rate for a set term, protecting you if rates fall. A money market account lets you withdraw anytime, but the rate can drop without warning.
Comparing bank accounts, credit union accounts, and mutual funds
| Account Type | Insured? | Principal Risk | Interest Rate Risk | Inflation Risk |
|---|---|---|---|---|
| Bank money market account | FDIC up to $250,000 | None | Yes — rates can fall | Yes — if rate falls below inflation |
| Credit union money market account | NCUA up to $250,000 | None | Yes — rates can fall | Yes — if rate falls below inflation |
| Money market mutual fund | No | Yes — share price can decline | Yes — yields adjust with market rates | Yes — if yield falls below inflation |
When to use a money market account despite the risks
A bank or credit union money market account makes sense if you need a place to hold money short-term while earning more than a regular savings account, and you want the safety of FDIC or NCUA insurance. The trade-off is that your rate will fluctuate and may fall below inflation.
Money market accounts are useful for emergency funds, money you are saving for a purchase within the next year or two, or cash you want to keep accessible while earning some return. They are not useful if you are trying to build wealth over decades — inflation will erode the real value of your money, and you would likely do better in a diversified investment portfolio.
If you are comparing a money market account to a high-yield savings account, the main difference is that money market accounts may offer slightly higher rates but often require a higher minimum balance and may limit the number of withdrawals per month. Check your bank's terms before opening one.
What happens if your bank fails
If your bank fails, the FDIC steps in and pays depositors up to $250,000 per account category. Money market accounts are one category, so if you have $200,000 in a money market account at a bank that fails, you receive your full $200,000. If you have $300,000, you receive $250,000 and lose $50,000.
Bank failures are rare in the United States. The FDIC has a fund backed by bank premiums and, if needed, by the U.S. government. Since the FDIC was created in 1933, no depositor has lost money on an insured deposit due to bank failure.
To stay fully protected, keep your total deposits at any single bank below $250,000, or spread deposits across multiple banks if you have more. The NCUA offers the same protection for credit union accounts.
Frequently Asked Questions
Can I lose money in a money market account at my bank?
You cannot lose your principal balance, but you can lose purchasing power if the interest rate falls below inflation. If you hold a money market mutual fund instead of a bank account, the fund's share price can decline and you can lose money.
What is the difference between a money market account and a money market fund?
A money market account at a bank is insured by the FDIC and your principal is protected. A money market mutual fund is an investment that holds short-term securities and is not insured — its value can fall. Both are considered low-risk, but only the bank account is risk-free.
Should I move my money market account to a CD if rates are falling?
If you expect rates to fall and you do not need the money soon, a CD locks in the current rate for a set term. However, you cannot withdraw early without a penalty. A money market account keeps your money flexible. Choose based on when you need the money and how confident you are about future rate movements.
What happens to my money market account if inflation stays high?
Your account balance stays the same, but the real value of your money declines. If inflation is 5% and your account earns 3%, you are losing 2% in purchasing power each year. Over time, this adds up. Consider whether a money market account is the right place for money you plan to hold for many years.
Is a money market account safer than a savings account?
Both are equally safe in terms of FDIC insurance — your principal is protected up to $250,000 at either one. Money market accounts typically pay higher interest rates, but they may require a higher minimum balance and sometimes limit withdrawals. Choose based on the rate, fees, and access you need.