What a mutual fund is and how your money moves inside it

A mutual fund is a pool of money from many investors that a professional manager uses to buy stocks, bonds, or other securities. When you put money in, you own a share of everything the fund holds. The fund's value rises or falls based on what those securities are worth on any given day.

You do not pick individual stocks yourself. Instead, the fund manager makes those decisions according to a written strategy — for example, buying only large U.S. companies, or a mix of stocks and bonds, or bonds from governments. You receive a share of any dividends or capital gains the fund earns, usually once or twice a year. You can also sell your shares back to the fund at any time, though the price you get depends on the fund's value that day.

Key Takeaways

  • You can open a mutual fund account through a brokerage firm, bank, or directly from a fund company, and you will need to choose between taxable accounts and retirement accounts like IRAs.
  • Mutual funds charge fees called expense ratios, typically ranging from 0.05% to over 1% per year, which come out of your account automatically.
  • Index funds and actively managed funds are the two main types; index funds track a market benchmark and usually cost less, while actively managed funds employ a manager to pick securities.
  • Your first step is to decide how much risk you can tolerate and how long you plan to keep the money invested, because these factors determine which funds make sense for you.
  • You will receive tax documents each year showing dividends and capital gains, which you report on your tax return if the account is not a retirement account.

Choosing between a taxable account and a retirement account

Before you buy any fund, you need to decide what type of account to hold it in. A taxable brokerage account has no contribution limits and no restrictions on when you withdraw money, but you pay taxes on dividends and gains each year. A retirement account like a traditional IRA or Roth IRA lets your money grow without annual tax bills, but you cannot withdraw without penalty before age 59½ in most cases.

If you have earned income, you can contribute up to $7,000 per year to an IRA (or $8,000 if you are 50 or older). If your employer offers a 401(k) or similar plan, you can contribute much more — up to $23,500 in 2024 — and many employers match part of what you contribute. If you do not have earned income or want to invest beyond these limits, a taxable account is your only option.

Most people start with a retirement account if they have access to one, because the tax advantage compounds over decades. A taxable account makes sense for money you may need before retirement or amounts above the annual limit.

Where to open an account and what paperwork you will need

You can open a mutual fund account at a brokerage firm (Fidelity, Vanguard, Charles Schwab), a bank, or directly from a fund company. Brokerage firms usually offer the widest selection of funds from many companies in one place. Banks often limit you to their own funds or a smaller list. Fund companies sell only their own funds but sometimes charge lower fees if you buy directly.

To open an account, you will provide your name, address, Social Security number, employment status, and income. The firm will ask whether the account is for yourself, a minor, or a trust. You will also choose whether it is a taxable account or a retirement account, and if a retirement account, which type. This takes 10 to 20 minutes online or over the phone. Most firms fund your account within one business day once you link a bank account or mail a check.

You do not need to have a certain amount of money to start. Some funds have a minimum initial investment of $1,000 or $2,500, but many have no minimum, and some brokerage firms let you buy fractional shares for any dollar amount.

Understanding fund types: index funds versus actively managed funds

An index fund tracks a specific market benchmark — for example, the S&P 500 (500 large U.S. companies) or the total U.S. stock market. The manager simply buys the same securities in the same proportions as the index, so the fund's performance mirrors the index minus a small fee. Index funds typically charge 0.03% to 0.20% per year.

An actively managed fund employs a manager or team to research and pick securities they believe will outperform the market. These funds charge higher fees — often 0.50% to 1.50% per year or more — because you are paying for the manager's work. Research shows that most actively managed funds do not beat their index fund counterparts over long periods, especially after fees are subtracted.

For a beginner, index funds are usually the simpler and cheaper choice. They require less monitoring, perform predictably, and cost less. Actively managed funds make sense if you have strong conviction about a manager's track record or want exposure to a specific strategy that no index fund covers.

How fees and expenses reduce your returns

Every mutual fund charges an expense ratio — an annual percentage of your account balance that pays for management, administration, and other costs. This fee is deducted automatically; you do not write a check. A fund with a 0.10% expense ratio costs $10 per year on a $10,000 investment. A fund with a 1.00% expense ratio costs $100 on the same amount.

Over decades, the difference compounds dramatically. On a $10,000 investment growing at 7% per year, a 0.10% fee versus a 1.00% fee results in roughly $30,000 less in your account after 30 years. Always check the expense ratio before you buy; it appears in the fund's prospectus and on the brokerage firm's website.

Some funds also charge a sales load — a one-time commission paid when you buy or sell. Load funds are less common now, and most brokerage firms offer thousands of no-load funds. Avoid loads unless a financial advisor has a specific reason to recommend one.

Deciding how much to invest and how to spread it across funds

How much you invest depends on your income, expenses, and goals. A common starting point is to invest what you can afford to leave alone for at least five years. If you need the money sooner, a money market fund or savings account is safer than a stock mutual fund, because stock prices fluctuate daily.

Most people do not buy a single fund. Instead, they build a portfolio — a mix of different funds that spreads risk. A simple portfolio for a younger investor might be 80% in a total U.S. stock index fund and 20% in a total international stock index fund. A more conservative portfolio might be 50% stocks and 50% bonds. The right mix depends on your age, income stability, and how much a drop in value would stress you.

Many brokerage firms offer target-date funds, which automatically adjust from stocks toward bonds as you approach retirement. These are designed for people who want a single fund that handles the mix for them. They charge a fee like any other fund, but they simplify the decision.

What happens after you buy: monitoring and rebalancing

Once you own mutual fund shares, you do not need to do much. The fund manager buys and sells securities within the fund; you do not have to. You will receive statements showing your account value, usually monthly or quarterly. You will also receive a prospectus update if the fund's strategy changes significantly.

Once or twice a year, check whether your portfolio still matches your target mix. If stocks have risen and now make up 90% of your account instead of 80%, you can sell some stock funds and buy bond funds to rebalance. This forces you to sell high and buy low, which is the opposite of what most people do naturally. You do not have to rebalance; many investors simply let their portfolio drift and rebalance only when they add new money.

You will receive tax documents each year if your account is taxable. A 1099-DIV shows dividends and capital gains; a 1099-B shows sales. Report these on your tax return. If your account is a retirement account, you do not report anything until you withdraw money.

Frequently Asked Questions

Can I lose all my money in a mutual fund?

A mutual fund can decline significantly in value, especially if it holds stocks and the market drops. During the 2008 financial crisis, many stock funds lost 40% to 50% of their value. However, a diversified fund holding hundreds of securities is unlikely to go to zero unless the entire market collapses, which has never happened in U.S. history. Bond funds are less volatile but can also decline if interest rates rise.

What is the difference between a mutual fund and an ETF?

An ETF (exchange-traded fund) is similar to a mutual fund but trades on a stock exchange like a stock does, so you can buy and sell during the trading day at changing prices. A mutual fund is priced once per day after the market closes. ETFs often have lower expense ratios and are more tax-efficient in taxable accounts. For a beginner, the difference is small; both are solid choices.

How long should I hold a mutual fund before selling?

Most financial advisors recommend holding for at least five years, because stock markets fluctuate over shorter periods and you may sell at a loss if you panic during a downturn. If you are investing for retirement, holding for decades is normal. If you need the money in two years, a stock mutual fund is too risky; consider a bond fund or money market fund instead.

Do I have to reinvest dividends, or can I take them as cash?

You can choose either. Most brokerage firms let you set each fund to reinvest dividends automatically (buying more shares) or pay them to your cash account. Reinvesting is usually better for long-term growth because you buy more shares while they are cheaper, but taking cash is fine if you need the income or prefer to control when you buy.

What if I want to stop investing and withdraw my money?

You can sell your shares anytime during market hours and receive the proceeds within one to three business days. If the account is a taxable account, you will owe taxes on any gains. If it is a retirement account, you generally cannot withdraw before 59½ without a 10% penalty plus income tax, with some exceptions for hardship or first-time home purchase.