We're Giving Away Cash! Enter to Win.

Skip to Main Content

What are Index Funds?

Trying to figure out which types of investments to include in your portfolio can be tricky. After all, there are so many options to choose from and it can feel overwhelming at times—and most people feel like giving up before they get started.

But the fact that you’re here reading this tells us that you are not like most people. You want to take charge of your financial future, and that starts with getting familiar with all of your investment options, including index funds.

Index funds get a lot of talk on the cable news shows, but are they really the best option when it comes to investing for retirement? Well, we are here to break down index funds for you so that you can decide whether or not they have a place in your investment plan.

Ready? Let’s do this!

What Is an Index Fund?

An index fund is a type of mutual fund designed to mirror the performance of the stock market or a particular area of the stock market.

Be confident about your retirement. Find an investing pro in your area today. 

A mutual fund lets investors pool their money together to invest in something. So in this case, the money in an index fund is used to invest in stocks, bonds or other types of investments inside a particular index. Speaking of which . . .

How Do Index Funds Work?

In order to understand how an index fund works, it’s important to understand what an index is. When it comes to the stock market, an index is basically a measuring stick. Indexes help investors measure the performance of the stock market in almost the same way you would use a ruler to measure how long something is.

There are hundreds of different indexes out there to measure many of the different sectors of the stock market. The S&P 500 Index, for example, is the one most experts use as a benchmark for the overall U.S. stock market. Standard & Poor (S&P) is a ratings agency that identifies the top 500 largest companies on the New York Stock Exchange to include in its index. In a very real way, they use it to measure the overall performance of the stock market.

So, what’s inside of an index fund? It depends on the index the fund is based on! An S&P 500 index fund, for example, is made up of stocks from many of the companies found inside the S&P 500 with the goal of mirroring the performance of that index. So, if you invested in an S&P 500 index fund, you own 500 stocks in a single fund with returns that are almost identical to the gains (or losses) of the S&P 500 itself.

This makes index funds a very “passive” form of investing. Instead of being run by a fund manager looking for investments that will beat the market, an index fund is more than happy to settle for “average.” Index funds are like mirrors—they’re designed to copy the performance of the index they are based on. No better and no worse.

What Are Some Different Types of Index Funds?

From bonds to foreign stocks and everything in between, there are hundreds of indexes out there used to track the performance of almost every sector of the financial market you can think of. And if there’s an index for it, you can almost bet your bottom dollar there’s an index fund for it.  

We’ve already talked about the S&P 500 index fund, which is probably the most famous example of an index fund out there. But that’s just the tip of the iceberg. Here are some other common index funds you’ll find, and you’ll notice that each one has its own unique flavor.  

Russell 2000 Index Fund

This fund is made up of stocks that are in the Russell 2000 index, which focuses on smaller companies. 

Wilshire 5000 Total Market Index Fund

Made up of almost 3,500 stocks, this is the largest U.S. stocks index out there and is also used to measure the performance of America’s publicly traded companies. 

MSCI EAFE Index Fund

Whoa, that’s almost half the alphabet right there! All you need to know is this index fund mirrors the performance of the international stock market, with foreign stocks from Europe, Australasia and the Far East (that’s what “EAFE” stands for) included in the mix. 

Barclays Capital U.S. Aggregate Bond Index Fund

This index fund is very different from the others in this list. That’s because this index follows the performance of the U.S. bond market and is full of bonds instead of stocks. Bonds are basically loans where the government borrows money from investors and agrees to pay them back, with interest. With bonds, you are the lender and the government is the borrower. 

Nasdaq Composite Index Fund

This fund has stocks from around 3,000 companies listed on the Nasdaq exchange, which is often used to measure the performance of the technology sector. 

Dow Jones Industrial Average (DJIA) Index Fund

The Dow Jones is the oldest stock market index in the U.S., made up of stocks from 30 large companies from all kinds of different industries. This index fund will have stocks from companies that are included in the Dow Jones index.  

Remember, with an index fund, don’t expect to get returns that are better or worse than the stock market or the index the fund is mirroring. Basically, the market’s returns are your returns.

What Are the Advantages of Index Funds?

If there’s one thing we tell everyone about investing, it’s this: Never invest in something you don’t understand. You need to have a good grasp of your investing options before deciding to invest your hard-earned money into anything. And that means weighing the pros and cons of all your options—including index funds.

Here are some of the pros of having index funds in your investment portfolio.

Index funds are diversified. 

Like we mentioned earlier, index funds are a type of mutual fund. And like other mutual funds, index funds are usually filled with stocks from hundreds of different companies. That gives you a nice layer of diversity. 

Index funds have lower expense ratios. 

Because index funds are basically just copying the index they’re named after, there’s not much to manage. Because of that, index funds usually have lower fees and expense ratios. 

Index funds are predictable. 

What you see is what you get. With an index fund, you know you’re going to get returns that are more or less the same as the stock market. And just like the stock market, there are going to be ups and downs.  

What Are the Disadvantages of Index Funds?

Here are some reasons you might want to think twice before adding index funds to your investment mix.

Index funds won’t beat the market. 

Listen, average is okay. But do you want to settle for “okay”? We don’t think so! 

Index funds are not very flexible. 

What’s inside of an index fund isn’t really up for debate. It only changes if the index it’s based on changes. So, the holdings inside your S&P 500 index fund, for example, will only change if the S&P 500 drops some companies for others in its index. 

Some index funds have higher maintenance fees. 

You’ll hear a lot about lower expense ratios from index fund crusaders. But hold up! While it’s true that many index funds have lower expense ratios than actively managed mutual funds, they’ll charge a hefty maintenance fee—sometimes listed as a 12b-1 fee—to make up for it. And those can really hurt your returns in the long run. Be on the lookout for those!    

Things to Be Aware of When Looking at Index Funds

Before you jump headfirst investing in index funds—or any kind of investment—you need to ask yourself a few questions.

What’s your investment goal?

The people who follow us know that we are all about getting people to millionaire status. But that doesn’t happen without a plan. Like we always say, “A dream without a plan is just a wish.”

So what’s the investment goal (ahem, retirement perhaps?), and how are you going to get there? (The 7 Baby Steps are a good place to start.)

Index funds get a lot of attention for being an easy way to get started investing, but “easy” isn’t the top criteria you want to consider for long-term investing.

What do the returns look like?

You want to make sure your returns are keeping pace with the long-term historical averages of the S&P 500. A good financial advisor can help you make sure your portfolio is balanced and performing well.

How much do the index funds cost?

Remember earlier when we were talking about management fees? Well, we need to talk about those one more time. Many of an index fund’s management fees are charged as a percentage of your fund’s balance. In other words, the larger your index fund balance, the more you’ll pay in investing fees.

Should Index Funds Be Part of Your Investment Strategy?

We don’t want you to settle for average. Here’s our advice: Invest 15% of your gross income in good growth stock mutual funds that have a long track record of strong returns that beat stock market indexes like the S&P 500.

Your investment portfolio should be divided evenly between four types of mutual funds.

Growth and Income Funds

These are the most predictable funds in terms of their market performance. 

Growth Funds

These are fairly stable funds in growing companies. Risk and reward are moderate. 

Aggressive Growth Funds

These are the wild-child funds. You’re never sure what they’re going to do, which makes them high-risk, high-return funds. 

International Funds

These are funds from companies around the world and outside your home country.

That way, your investment portfolio will be well diversified—which means you’re not keeping your entire nest egg in one basket. But you’re still going after funds that are going to beat the market and help you build a nice, big nest egg for retirement over time.

Get With a SmartVestor Pro!

Now look, some mutual funds underperform the stock market—and you want to stay far away from those—but there are many mutual funds out there that outperform the market. Picking and choosing the right funds is a big deal!  

It’s always a good idea to sit down with a pro who can help you set goals for your financial future and help you understand all your options, from index funds to growth stock mutual funds.

Our SmartVestor program connects you with investment professionals in your area. Each one has been vetted by our team here at Ramsey Solutions, and they will patiently walk you through the investing process.

Find a SmartVestor Pro in your area today!

Ramsey Solutions

About the author

Ramsey Solutions

Ramsey Solutions has been committed to helping people regain control of their money, build wealth, grow their leadership skills, and enhance their lives through personal development since 1992. Millions of people have used our financial advice through 22 books (including 12 national bestsellers) published by Ramsey Press, as well as two syndicated radio shows and 10 podcasts, which have over 17 million weekly listeners.

Thank you!  Your guide is on its way.

Build Long-Term Wealth 

Build Long-Term Wealth

Work with an investing pro and take control of your future.
Get Started

Build Long-Term Wealth

Work with an investing pro and take control of your future.
Get Started