A money market fund is a type of mutual fund that invests in very short-term, high-quality debt — things like Treasury bills, certificates of deposit, and commercial paper. Its goal is to provide a safe place to park cash while earning modest interest and keeping a stable share price (typically $1.00 per share). Money market funds are popular for holding cash you want to keep liquid but still want to earn something on.
Money Market Fund vs. Money Market Account
These two sound nearly identical but are very different products:
- Money market account (MMA): A bank deposit account, FDIC-insured up to $250,000. Offered by banks and credit unions.
- Money market fund: An investment product offered by brokerages and fund companies. Not FDIC-insured, though it invests in very safe assets.
The key distinction: a money market account is a savings vehicle backed by federal deposit insurance, while a money market fund is an investment that aims for stability but carries a small amount of risk.
How Money Market Funds Work
The fund pools money from many investors and buys a diversified basket of short-term debt instruments. The interest those securities pay flows back to investors as dividends, usually paid monthly. Because the underlying investments mature quickly (often within days to a few months), the fund’s value stays very stable.
Most retail money market funds aim to maintain a constant $1.00 net asset value (NAV) per share. While “breaking the buck” (dropping below $1.00) is rare, it has happened in extreme market stress — which is why these funds are considered low-risk but not risk-free.
Types of Money Market Funds
- Government money market funds: Invest primarily in Treasury securities and government-backed debt. The safest category.
- Prime money market funds: Include corporate commercial paper and other short-term corporate debt. Slightly higher yield, slightly higher risk.
- Municipal (tax-exempt) money market funds: Invest in short-term municipal debt. Income may be exempt from federal (and sometimes state) taxes — useful for higher-bracket investors.
When to Use a Money Market Fund
- Holding cash in a brokerage account: Money waiting to be invested often sits in a money market fund earning interest instead of nothing.
- Short-term savings goals: Money you’ll need within a year and can’t risk losing.
- Emergency reserves (the investment portion): Some people keep part of their emergency fund here for a slightly higher yield, while keeping the rest in an FDIC-insured account.
FAQ
- Are money market funds safe? They’re among the lowest-risk investments available, especially government money market funds. But unlike a bank account, they aren’t FDIC-insured, so they carry a small amount of risk.
- How is a money market fund different from a savings account? A savings account is an FDIC-insured bank product. A money market fund is a brokerage investment that aims for stability but isn’t insured.
- Can I lose money in a money market fund? It’s rare, but possible. Funds aim to hold a $1.00 share price; in severe market disruption, that can slip (“breaking the buck”).
- How do I access my money? Money market funds are highly liquid — you can typically redeem shares within one business day, though some funds offer check-writing or same-day transfers.
- Are money market fund earnings taxable? Yes, the dividends are generally taxable, unless you hold a municipal money market fund (which may be tax-exempt) or hold the fund in a tax-advantaged account.
Final Thought
A money market fund is a convenient, low-risk place to hold cash within a brokerage account while earning more than a basic checking account. Just remember the crucial distinction: a money market fund is an investment without FDIC insurance, while a money market account is an insured bank deposit. Know which one you have, and match it to your tolerance for even small risk.
Further Reading
Disclaimer: This article is for educational purposes only and does not constitute financial, tax, or legal advice. Consult a qualified professional before making financial decisions.