A mutual fund collects money from many investors and uses it to buy stocks, bonds, or other securities

A mutual fund is a pot of money managed by a professional. You and thousands of other investors put money in. The fund manager uses that combined money to buy a mix of stocks, bonds, or other investments. You own a share of everything the fund holds, not individual securities. When the fund's investments gain value or pay dividends, your share grows. When they lose value, your share shrinks.

The fund is run by an investment company — firms like Vanguard, Fidelity, or Schwab manage some of the largest ones. The manager decides what to buy and sell based on the fund's stated goal. Some funds chase growth by buying stocks of small companies. Others focus on income by buying bonds from stable corporations or governments. A fund's prospectus — the legal document you get before investing — spells out exactly what the manager is allowed to buy.

You buy into a mutual fund through a brokerage account or directly from the fund company. Your money buys shares of the fund itself, not shares of the companies inside it. If the fund is worth $100 million and you own $10,000 worth, you own 0.01 percent of the fund. The price of one fund share changes daily based on the total value of all the investments the fund holds divided by the number of shares outstanding.

Key Takeaways

  • A mutual fund pools money from many investors and a professional manager buys and sells investments on behalf of all of them.
  • You own shares of the fund itself, not the individual stocks or bonds inside it, and your share's value changes as the fund's holdings gain or lose value.
  • Mutual funds charge fees — typically 0.5 to 2 percent of your investment per year — which come out of fund returns before you see them.
  • Actively managed funds have a manager making buy-and-sell decisions; index funds track a preset list of investments and charge lower fees.
  • You can buy mutual funds through a brokerage account, a retirement account like an IRA or 401(k), or directly from the fund company.

How a fund manager decides what to buy and sell

The fund manager's job is to follow the fund's stated strategy and try to meet its goal. If you buy a fund labeled "Large-Cap Growth," the manager buys stocks of big, established companies expected to grow faster than the overall market. If you buy a "Bond Fund," the manager buys debt issued by corporations or governments. The prospectus lists the types of investments allowed and any restrictions — for example, a fund might say it will not hold more than 5 percent of its money in any single stock.

The manager buys and sells throughout the year as opportunities arise or as holdings no longer fit the strategy. When you own the fund, you do not decide which stocks or bonds go in or out — the manager does that. This is why mutual funds are called actively managed when a person is making those decisions. Some funds, called index funds, do not have a manager making choices. Instead, they automatically hold every stock or bond in a specific index — like the S&P 500 or the total bond market — in the same proportions. Index funds charge much lower fees because there is no manager salary to pay.

Fees and costs that reduce your returns

Every mutual fund charges fees. The most common is the expense ratio, expressed as a percentage of your investment per year. An expense ratio of 1 percent means that if you own $10,000 in the fund, you pay $100 per year in fees. This money is taken from the fund's returns before you see your gains. Actively managed funds typically charge 0.5 to 2 percent per year. Index funds usually charge 0.03 to 0.20 percent because they require less work to run.

Some funds also charge a sales load — a one-time fee when you buy or sell. A front-end load is charged when you buy in, reducing the amount of your money that actually enters the fund. A back-end load is charged when you sell, taking a cut of your proceeds. Many funds sold through brokerages have loads ranging from 3 to 6 percent. Funds sold directly from the company often have no load at all.

You may also pay trading costs if the fund buys and sells frequently. These are not listed as a separate fee but they reduce returns. A fund that trades heavily — called high turnover — can cost you more in hidden expenses than a fund that holds the same investments for years. The prospectus lists the fund's turnover ratio so you can see how often the manager trades.

How your money grows through dividends and capital gains

A mutual fund makes money in two ways. First, the companies or governments whose securities the fund holds pay dividends or interest. A stock dividend is a payment a company makes to shareholders. A bond pays interest to the lender. The fund collects all these payments and distributes them to you, usually once or twice a year. You can take the distribution as cash or reinvest it to buy more fund shares.

Second, the fund's holdings increase in value. When a stock the fund owns rises from $50 to $60, the fund has a capital gain. When the manager sells that stock, the gain is realized and distributed to shareholders. If the stock rises but the manager has not sold it yet, it is an unrealized gain — it exists on paper but has not been distributed. At the end of the year, the fund distributes all realized capital gains to shareholders. If the fund's holdings fall in value, you have a loss instead.

The total return you earn is the combination of dividends, interest, and capital gains, minus fees. If a fund's holdings earn 8 percent but the expense ratio is 1 percent, your net return is roughly 7 percent. Over decades, that 1 percent difference compounds into a significant amount of money.

The difference between open-end and closed-end funds

Most mutual funds are open-end funds. You can buy or sell shares any day the market is open. The fund creates new shares when you buy in and cancels shares when you sell. The price you pay or receive is the fund's net asset value, or NAV — the total value of all holdings divided by the number of shares outstanding, calculated once per day after the market closes. If you place an order to buy or sell during the trading day, you get whatever the NAV is at the end of that day, not the price when you placed the order.

Closed-end funds work differently. The fund issues a fixed number of shares once, then stops. After that, you buy and sell shares on a stock exchange, just like stocks. The price fluctuates based on supply and demand, not the fund's NAV. A closed-end fund might have a NAV of $10 per share but trade for $9.50 because more people want to sell than buy. Closed-end funds are less common and often focus on specific sectors or strategies like municipal bonds or emerging markets.

Where to buy mutual funds and how they fit into retirement accounts

You can purchase mutual funds through a brokerage account — online brokers like Fidelity, Charles Schwab, and E-Trade all offer thousands of funds. You can also buy directly from the fund company's website. Some funds are available only through certain brokerages or financial advisors. When you buy through a brokerage, you may see the same fund offered with different share classes — typically A, B, C, or I shares — which differ in how and when fees are charged.

Mutual funds are a common holding inside retirement accounts. A 401(k) plan offered by your employer typically holds a menu of mutual funds you choose from. An IRA — whether traditional or Roth — can hold mutual funds, stocks, bonds, or other investments depending on which brokerage holds the account. Many people build their retirement savings by investing in mutual funds inside these accounts because the tax treatment is favorable: gains and dividends are not taxed each year, only when you withdraw money in retirement.

Target-date funds are a type of mutual fund designed specifically for retirement accounts. You pick a fund based on the year you plan to retire — for example, a 2050 target-date fund. The fund automatically shifts from stocks to bonds as that year approaches, becoming more conservative over time. This removes the need to rebalance manually.

Active versus passive investing and fund performance

An actively managed fund has a manager trying to beat the market by picking the best investments. The manager researches companies, analyzes economic trends, and makes buy-and-sell decisions. The goal is to earn returns higher than a benchmark index. However, most actively managed funds do not beat their benchmark after fees are subtracted. Studies consistently show that over 10 or 20 years, the majority of active managers underperform a straightforward index fund tracking the same market.

A passive fund or index fund does not try to beat the market. It straightforward holds all the investments in a specific index in the same proportions. An S&P 500 index fund holds all 500 companies in that index. Because there is no manager making decisions, costs are much lower. Over long periods, the lower fees give index funds an advantage even though they are not trying to outperform. This is why many investors, especially those saving for retirement, use index funds as their core holdings.

Past performance does not predict future results. A fund that beat the market last year may underperform next year. When comparing funds, look at long-term performance — at least 10 years if possible — and always compare funds with the same goal and strategy. A growth fund and a bond fund will have completely different returns; comparing them is not useful.

Frequently Asked Questions

Can I lose all my money in a mutual fund?

You can lose money if the fund's holdings fall in value, but losing everything is extremely unlikely unless the fund holds very risky investments like penny stocks or emerging market debt. Most mutual funds hold dozens or hundreds of securities, so a single bad investment does not wipe out the fund. The fund company is required to keep your money separate from its own, so if the company fails, your money is protected.

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. You can buy or sell an ETF any time during the trading day at a changing price. A mutual fund trades once per day at a fixed price. ETFs often have lower fees than mutual funds and are more tax-efficient, but mutual funds offer more flexibility in how you set up automatic investments. Both can hold the same types of investments.

Do I have to pay taxes on mutual fund distributions?

Yes, unless the fund is held inside a tax-advantaged account like an IRA or 401(k). Dividends and capital gains distributions are taxable in the year you receive them, even if you reinvest them. The tax rate depends on the type of distribution and how long you held the fund. In a retirement account, distributions are not taxed until you withdraw money in retirement.

How often should I check my mutual fund balance?

There is no set rule, but checking quarterly or annually is typical for long-term investors. Checking daily can lead to emotional decisions based on short-term price swings. If you are saving for retirement decades away, daily price changes are noise. If you are nearing retirement or need the money soon, checking more frequently makes sense so you can adjust if needed.

Can I switch between mutual funds without paying taxes?

You can switch between funds inside a retirement account without triggering taxes. In a regular brokerage account, selling one fund to buy another creates a taxable event if you have gains. You owe capital gains tax on the profit, even though you are staying invested. This is one reason to think carefully before switching funds in a taxable account.