Mutual Funds: Benefits, Types and How They Work

Mutual funds are investments that pool together investor money to buy a selection of assets. Mutual funds can help investors quickly build a diversified portfolio.

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What are mutual funds?

Mutual funds are a type of investment that pools together money from many investors, then uses that money to invest in stocks, bonds or other assets.

  • Mutual funds are typically managed by a professional who selects the investments for the fund.

  • There are mutual funds to suit most investment styles and goals.

  • Mutual fund investors don’t directly own the stock or other investments held by the fund, but they do share equally in the profits or losses of the fund’s total holdings — hence the “mutual” in mutual funds.

  • Index funds and exchange-traded funds are similar to mutual funds in that they hold a number of different assets within a single investment.

Benefits of mutual funds


Simplicity: Once you find a mutual fund with a good record, you have a relatively small role to play: The fund managers do all the heavy lifting of selecting and rebalancing investments.


Low costs: Investing costs have come down, and that extends to mutual funds. Mutual funds can be an inexpensive way to hold many investments at once. Passive funds like index funds and ETFs are even more cost-effective.

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Diversification: Mutual funds provide access to a large selection of investments without the difficulties of having to purchase and monitor dozens of individual assets yourself.


How mutual funds work

No matter which category a mutual fund falls into, its fees and performance will depend on whether it is actively or passively managed. Passively managed funds invest according to a set strategy. They try to match the performance of a specific market index, and therefore require little investment skill or professional management. Given that, they will carry lower fees than actively managed funds.

Actively managed funds have a fund manager or team making decisions about how to invest the fund's money, so they typically charge higher fees. Often they try to outperform the market or a benchmark index, but studies have shown passive investing strategies often deliver better returns.

How mutual funds earn a return

When you invest in a mutual fund, your investment or the fund's value can increase from three sources:

  1. Dividend payments: When a fund receives dividends or interest on the securities in its portfolio, it distributes a proportional amount of that income to its investors. When purchasing shares in a mutual fund, you can choose to receive your distributions directly, or have them reinvested in the fund.

  2. Capital gain: When a fund sells a security that has gone up in price, this is a capital gain. (And when a fund sells a security that has gone down in price, this is a capital loss.) Most funds distribute any net capital gains to investors annually.

  3. Net asset value (NAV): As the value of the fund increases, so does the price to purchase shares in the fund (known as the NAV per share). This is similar to when the price of a stock increases — you don’t receive immediate distributions, but the value of your investment is greater, and you would make money should you decide to sell.

Keep in mind that as with any investment, you can also lose money, especially in the short-term.

Common types of mutual funds

Stock mutual funds typically carry the greatest risk alongside the greatest potential returns. Fluctuations in the stock market can drastically affect the returns of equity funds. There are several types of equity funds, such as growth funds, income funds and sector funds. Each of these groups tries to maintain a portfolio of stocks with certain characteristics.

Bond funds are typically less risky than stock funds. There are many different types of bonds, so you should research each mutual fund individually in order to determine the amount of risk associated with it. (View our list of the best-performing bond ETFs.)

These mutual funds often have the lowest returns because they carry the lowest risk. Money market funds are legally required to invest in high-quality, short-term investments that are issued by the U.S. government or U.S. corporations.

Target date funds typically invest in a mix of stocks, bonds and other securities. These funds choose their investment mix based on a defined timeline, and often have a year in their name. They reallocate assets toward safer investments as that year approaches. They are a frequent offering in retirement plans like 401(k)s.

The 3-mutual fund portfolio

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Building a portfolio with mutual funds

Building the best investment portfolio for you can be challenging. There are lots of mutual funds out there  — how do you know which is the best? With just three types of mutual funds, you can build a well-diversified portfolio quickly based on your time horizon and risk tolerance. NerdWallet's Marko Zlatic walks through all the details in this video.

Compare mutual funds, index funds and ETFs

Frequently asked questions about funds

Exchange-traded funds are a type of investment fund that offer the best attributes of two popular assets: They have the diversification benefits of mutual funds while mimicking the ease with which stocks are traded. They are often passive, meaning they track an investment index. » Learn more about ETFs

An index fund is a type of mutual fund whose holdings match or track a particular market index. It's hands-off, and you could build a diversified portfolio earning solid returns using mostly this type of investment. » Learn more about index funds

Closed-end funds are a lesser-known kind of mutual fund. Sometimes called a CEF, these funds are managed by an investment firm and raise money through an initial public offering, or IPO, selling a fixed number of shares. After that, the fund is closed to investors. Like mutual funds and ETFs, closed-end funds invest in a basket of securities. Your best odds of success come when you buy them at a discount. » Learn more about closed-end funds

Open-end funds are typical mutual funds — they can sell as many shares to investors as they want at the fund’s net asset value per share. They're much more common and much more popular than closed-end mutual funds.

Mutual fund investors pay two basic types of fees: expense ratios and sales commissions, which are known in the industry as sales loads. Most mutual funds carry some sort of expense ratio; as discussed above, passive funds generally cost less than active funds. Be sure to compare fund expense ratios before choosing an investment.

Not all funds carry a commission; in fact, commissions are easy to avoid. Whether or not funds carry commissions are expressed by “loads." Look for a no-load fund or no-transaction-fee funds to avoid commissions. » Learn more about fund fees

You can purchase through an employer-sponsored retirement account like a 401(k), an individual retirement account like an IRA or a brokerage account.

You’ll have the most choices in a brokerage account or IRA. You can also purchase mutual funds directly from a fund provider, but you'll be limited to that provider's fund offerings only. » Learn how to buy mutual funds

Platforms for buying mutual funds

Find the best-performing funds

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