Money market funds carry less risk than stocks, but they are not insured the way bank deposits are

Money market funds are investment funds, not bank accounts. That distinction matters for safety. A money market fund holds short-term debt — Treasury bills, commercial paper, certificates of deposit from banks — and pays you a share of the interest it earns. Because the underlying investments are very short-term and low-risk, the fund's value stays relatively stable. But the fund itself is not backed by the Federal Deposit Insurance Corporation (FDIC), which means if the fund company fails or the fund's investments go bad, your money is not automatically protected the way it would be in a bank savings account.

The real risk in a money market fund is not that you will lose your principal overnight. It is that the fund's share price could drop below $1.00 per share — an event called "breaking the buck" — or that the fund company itself could become insolvent. Both are rare. Breaking the buck has happened only a handful of times in the history of money market funds, most notably during the 2008 financial crisis. But the possibility exists, and you should understand what it means for your money.

Key Takeaways

  • Money market funds are not FDIC-insured, so they do not carry the same legal protection as money market accounts held at banks.
  • The underlying investments in a money market fund — Treasury bills and short-term corporate debt — are individually low-risk, but the fund itself can lose value if markets deteriorate sharply.
  • Money market funds are regulated by the Securities and Exchange Commission (SEC) and must follow strict rules about what they can hold and how they operate.
  • If safety is your primary concern, a money market account at a bank offers FDIC insurance up to $250,000 per depositor, though it typically pays lower interest than a money market fund.

How money market funds are regulated and what that means for your safety

The SEC sets strict rules for what money market funds can own and how they must manage risk. A money market fund can only hold investments that mature in 13 months or less, and the average maturity of the entire fund must be 60 days or less. This short time horizon is the main reason money market funds are considered safer than bond funds — the fund's holdings turn over quickly, and the fund manager can respond to changing conditions without being locked into long-term positions.

The SEC also requires money market funds to maintain a certain level of liquid assets — money that can be converted to cash quickly — and to disclose their holdings regularly. Fund companies must have their own capital reserves to cover potential losses. These rules reduce the chance of a sudden crisis, but they do not eliminate it. The 2008 financial crisis showed that even with regulation, a money market fund can face a run if investors lose confidence and try to withdraw their money all at once.

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

A money market account is a bank product, held at a bank or credit union, and covered by FDIC insurance up to $250,000 per depositor per institution. A money market fund is an investment product, held through a brokerage or fund company, and not insured by the FDIC. The names are similar, which confuses many people, but the safety structure is different.

A money market account typically pays interest based on the bank's own rates and policies. A money market fund pays interest based on what the underlying investments earn, minus the fund's fees. Because money market funds are not insured, they often pay higher interest than money market accounts — the higher rate is compensation for the additional risk you are taking. If you prioritize safety over yield, a money market account at a bank is the more conservative choice. If you are comfortable with a small amount of additional risk in exchange for potentially higher returns, a money market fund may make sense as part of a broader savings strategy.

What happens if a money market fund breaks the buck

Breaking the buck means the fund's share price falls below $1.00. If you own 1,000 shares of a money market fund and the share price drops from $1.00 to $0.99, your $1,000 investment is now worth $990. You have lost money. This is the main way a money market fund investor can suffer a loss.

When a money market fund breaks the buck, the fund company may try to stabilize it by injecting its own capital to bring the share price back to $1.00. This happened during the 2008 crisis — several large fund companies used their own reserves to prevent their money market funds from breaking the buck. But the fund company is not legally required to do this, and if the losses are large enough, the company may not be able to afford it. In that case, investors would share the loss proportionally based on their holdings.

How to assess the safety of a specific money market fund

If you are considering a money market fund, look at the fund's prospectus and fact sheet, which you can find on the fund company's website or through your brokerage. The prospectus will tell you what the fund holds, what its fees are, and what its average maturity is. A shorter average maturity — closer to 30 days than 60 days — generally means lower risk, because the fund's holdings turn over more quickly.

Check the fund company's size and reputation. Larger, well-established fund companies like Vanguard, Fidelity, and Schwab have more capital reserves and are less likely to fail. Look at the fund's yield relative to other money market funds. If one fund is paying significantly more than others, ask why — it may be taking on more risk to generate that higher return. You can also check ratings from Morningstar or other fund research services, though remember that past performance does not predict future results.

Money market funds versus other short-term savings options

A high-yield savings account at a bank offers FDIC insurance, competitive interest rates, and complete liquidity — you can withdraw your money anytime without penalty. The main drawback is that rates can change, and some banks offer lower rates than others. A money market fund offers potentially higher yields but no FDIC insurance. A certificate of deposit (CD) offers FDIC insurance and a may provide rate, but your money is locked up for a set period, and you pay a penalty if you withdraw early.

Treasury bills are direct obligations of the U.S. government and are considered the safest short-term investment available. You can buy them directly from the U.S. Treasury through TreasuryDirect.gov, or through a brokerage. They are not FDIC-insured because they do not need to be — the government backs them. But Treasury bills have minimum purchase amounts and may require more effort to buy and sell than a money market fund.

The right choice depends on your priorities. If you want the highest safety and do not mind a lower rate, use a bank savings account or Treasury bills. If you want a balance of safety and yield, a money market fund from a large, reputable company is reasonable. If you need may provide access to your money with no risk at all, a high-yield savings account is your best option.

What to do if you are worried about a money market fund you own

If you own shares in a money market fund and you are concerned about its safety, you have several options. You can move your money to a different money market fund with a lower-risk profile or to a bank money market account. You can move it to a high-yield savings account, which offers FDIC insurance. You can buy Treasury bills directly. Or you can keep the fund but reduce the amount you hold in it, spreading your short-term savings across multiple options.

Before you move your money, understand the tax and fee implications. If the fund is in a taxable account and you have gains, selling may trigger capital gains tax. If you are moving between funds at the same company, there may be no fee. If you are moving to a different company, check whether there are transaction fees. In a retirement account like an IRA, you can move money between funds without tax consequences, so the decision is simpler.

Frequently Asked Questions

Can I lose all my money in a money market fund?

It is extremely unlikely. Money market funds hold very short-term, low-risk investments, and fund companies maintain capital reserves. The worst-case scenario is that the fund breaks the buck and you lose a small percentage of your investment. Losing everything would require a catastrophic failure of both the fund's investments and the fund company itself, which has never happened in the history of money market funds.

Is a money market fund safer than a savings account?

A bank savings account is safer because it is FDIC-insured up to $250,000. A money market fund is not insured. However, a money market fund's underlying investments are very safe, and the risk of actual loss is low. The trade-off is that a money market fund may pay higher interest than a savings account, which is compensation for the lack of insurance.

What happened to money market funds in 2008?

During the 2008 financial crisis, one large money market fund (the Reserve Primary Fund) broke the buck when one of its investments — a short-term loan to Lehman Brothers — became worthless after Lehman failed. The U.S. government stepped in with a temporary insurance program to prevent a broader panic. Several other fund companies used their own capital to prevent their funds from breaking the buck. The crisis led to stricter SEC regulations on money market funds.

Should I move my money from a money market fund to a savings account?

That depends on your priorities. If safety is your only concern, a bank savings account or Treasury bills are better choices. If you want to maximize interest income and are comfortable with a small amount of additional risk, a money market fund from a large company is reasonable. Consider your time horizon — if you need the money within a year, a money market fund or savings account makes sense. If you can leave it invested longer, other options may offer better returns.

Do I need to pay taxes on money market fund interest?

Yes, unless the fund holds tax-exempt municipal bonds. Interest from a regular money market fund is taxed as ordinary income at your federal and state tax rates. If the fund is in a retirement account like a traditional IRA or 401(k), taxes are deferred until you withdraw the money. If it is in a Roth IRA, the interest is tax-free.