Yes, money market accounts can lose money, but the risk depends on what type of account you have and what you do with it

A traditional money market account held at a bank or credit union with FDIC or NCUA insurance will not lose the principal you deposit — that money is protected up to $250,000 per depositor, per institution. However, money market mutual funds (a different product with a similar name) can and do lose value, because they invest your money in short-term securities that fluctuate in price.

The confusion between these two products causes real problems. Many people think they are buying bank protection when they are actually buying a fund that moves with market conditions. The difference matters because one is a savings tool and the other is an investment tool, and they behave completely differently when interest rates change or when credit conditions tighten.

Key Takeaways

  • Bank and credit union money market accounts are insured against loss of principal, but money market mutual funds are not and can decline in value.
  • Money market mutual funds hold short-term debt securities that change price when interest rates move, which is the main source of loss.
  • Even insured money market accounts can lose purchasing power if the interest rate they pay falls below inflation.
  • The account name alone does not tell you whether you have bank protection or fund risk — you must check your account documents or ask your institution.
  • Money market funds can also lose money if the issuer of the securities they hold defaults, though this is rare in practice.

The difference between a bank money market account and a money market fund

A money market account at a bank or credit union is a deposit product. You hand over cash, the institution holds it, and you earn interest. The FDIC (for banks) or NCUA (for credit unions) insures your balance up to $250,000. Your principal cannot shrink. The only risk is that the interest rate will be low, so you earn less than inflation and your money loses purchasing power over time.

A money market mutual fund is an investment product. You buy shares in a fund that holds a portfolio of short-term debt securities — Treasury bills, commercial paper, certificates of deposit, and similar instruments. The value of those securities moves with interest rates and credit conditions. When interest rates rise, the value of existing securities falls (because new ones pay more). When credit conditions tighten, issuers become riskier and securities lose value. Your share price can drop, and you can lose money.

The names are confusing because they both say "money market," but they are fundamentally different. One is a savings account. One is a mutual fund. Ask your bank or brokerage directly: "Is this a deposit account insured by the FDIC, or is it a mutual fund?" The answer will tell you whether your principal is protected.

How money market mutual funds lose value

Money market funds hold short-term debt that matures in less than one year, usually much less. When interest rates rise, new debt is issued at higher rates, which makes existing debt (paying lower rates) worth less. If you sell your fund shares before maturity, you sell at that lower price and realize a loss.

For example: a fund holds commercial paper paying 2 percent. Interest rates rise, and new commercial paper pays 4 percent. The old paper is now less attractive to buyers, so its price falls. If the fund needs to sell it to meet withdrawals, it sells at a loss. That loss is passed to the fund's shareholders as a decline in share price.

Credit risk also matters. If a company or government issuer of the debt the fund holds runs into trouble, the value of that debt can drop sharply. Money market funds are supposed to hold only very safe, short-term debt, but "very safe" is not the same as "no risk." During the 2008 financial crisis, some money market funds held debt from institutions that failed, and fund values fell below $1 per share — a "break the buck" event that shocked investors who thought they were holding cash.

When insured money market accounts lose purchasing power

Even though your principal is protected at a bank money market account, you can still lose money in real terms if the interest rate falls below inflation. If your account earns 1 percent and inflation is 3 percent, you are losing 2 percent of your purchasing power each year. Your balance number stays the same, but what it can buy shrinks.

This is a real cost, but it is different from losing money in the account itself. Your $10,000 stays $10,000 in the account. It just buys less at the grocery store. Money market accounts are meant to be safe places to park cash, not to beat inflation, so this trade-off is normal. If you need your money to grow faster than inflation, you would need to take on investment risk elsewhere.

What happens if your bank or credit union fails

If your bank fails, the FDIC takes over and pays you up to $250,000 per account category. If you have a money market account at that bank, you are paid in full (up to the limit) within a few business days. The FDIC has a strong track record of paying depositors quickly, so this risk is very low in practice.

If your credit union fails, the NCUA does the same thing. The process is the same and the protection is the same. You do not need to do anything — the insurance is automatic. You only need to make sure you stay under the $250,000 limit per institution. If you have more than that, spread it across multiple banks or credit unions to keep each account under the limit.

How to know which type of account you actually have

Look at your account statement or log into your online account. If it says "FDIC insured" or "NCUA insured," you have a bank or credit union deposit account and your principal is protected. If it says "mutual fund" or "investment" anywhere on the document, you have a fund and your value can move.

You can also call your bank or brokerage and ask directly: "Is my money market account a deposit account or a mutual fund?" They will tell you in seconds. Do not assume based on the name or the interest rate. Some banks offer both products, and they can look similar on a website.

If you have a money market mutual fund and you want to avoid the risk of principal loss, you can move the money to a bank money market account instead. You will likely earn a lower interest rate, but your principal will be protected. The trade-off is yours to make based on how much safety you need.

What to do if you want safety and reasonable returns

If you want your money protected and you want to earn more than inflation, consider a high-yield savings account at a bank or credit union. These are FDIC or NCUA insured, so your principal is protected. Interest rates on these accounts have risen significantly in recent years and often match or exceed money market account rates at the same institution.

You can also use a combination: keep your emergency fund in a high-yield savings account (for safety and quick access), and if you have money you will not need for a year or more, consider a certificate of deposit (CD) at the same bank. CDs are also insured and typically pay higher rates than savings accounts because you agree to lock the money away for a set period.

If you already own a money market mutual fund and you are uncomfortable with the risk, you do not have to sell it all at once. You can move new money to a bank account and let the fund holdings mature naturally. This spreads out any potential losses and gives you time to decide what to do with the fund balance.

Frequently Asked Questions

Can a money market account at my bank go to zero?

No. If it is a bank deposit account insured by the FDIC, your balance is protected up to $250,000 and cannot go below what you deposited. If it is a money market mutual fund, it can decline in value, but it would have to fall all the way to zero only if every security in the fund defaulted, which is extremely rare.

What is the difference between a money market account and a money market fund?

A money market account is a bank deposit product with FDIC insurance protecting your principal. A money market fund is a mutual fund that invests in short-term securities and can lose value. The names are similar but the products are completely different. Check your account documents to see which one you have.

If interest rates go up, will my money market account lose money?

If you have a bank money market account, your principal will not lose value, but the interest rate you earn may drop because the bank will lower what it pays on new deposits. If you have a money market mutual fund, rising rates will cause the value of the securities in the fund to fall, which can result in a loss if you sell shares.

Is my money market account insured if the bank fails?

Yes, if it is a bank deposit account. The FDIC insures up to $250,000 per depositor, per bank. If the bank fails, you are paid in full (up to the limit) within a few business days. If your account is at a credit union, the NCUA provides the same protection.

Should I move my money market fund to a bank account?

That depends on how much safety you need and how long you can leave the money untouched. If you need your money protected and you do not need high returns, a bank money market account or high-yield savings account is safer. If you can tolerate short-term fluctuations and you want the potential for slightly higher returns, a money market fund may fit your situation.