Index Fund vs. Mutual Fund: What's the Difference? (2024)

When you’re putting together a portfolio, you’ll notice there are a lot of different types of funds to choose from. So it’s easy to get confused about what the terms “mutual fund” and “index fund” refer to. The two terms refer to distinct categories: Mutual fund refers to a fund’s structure, whereas index fund refers to a fund’s investment strategy. Many, but not all, index funds are structured as mutual funds, and many mutual funds are index funds. Generally speaking, though, “index fund” refers to a fund whose investments closely track a market index, while “mutual fund” refers to a broad class of investment funds that follow a range of investing strategies. A financial advisor can help you understand the similarities and differences between mutual funds vs. index funds so that you can make an informed investing decision.

What Is a Mutual Fund?

A mutual fund combines the funds of investors who mutually pool their monies to buy and sell securities. Investing in a mutual fund is not trading shares of specific companies held by the mutual fund. Instead, it is trading shares of the mutual fund company itself. Investors buy and sell their stakes in mutual funds at a price set at the end of a trading session – their value does not fluctuate throughout the trading session.

Most mutual funds, which often carry minimum balance requirements, fall into one of four categories:

When determining what type of fund is right for you, it can also be helpful to consider some of the pros and cons of mutual funds.

What Is an Index Fund?

The term “index fund” refers to the investment approach of a fund. Specifically, it is a fund – either mutual or exchange traded (ETF) – that aims to match the performance of a particular market index, such as the S&P 500 or Russell 2,000, or a specific commodity or class of commodities.Unlike a mutual fund, an ETF has a value that fluctuates on a public exchange throughout a trading session.

An index fund differs from an actively managed fund in one big way. In an actively managed fund, investments are picked by a fund manager trying to beat the market. An index fund does not seek to beat the market, only to match it.

Investing in an index fund can bring these benefits:

Index Funds vs. Mutual Funds: Management, Goals and Costs

Aside from the distinction described above, there are usually three main differences between index funds and mutual funds. These differences are how decisions are made about a fund’s holdings, the goals of the fund, and the cost of investing in each fund. Here’s a breakdown of each differentiator and how it may apply to you.

Comparing Active vs. Passive Investment Management

Many, but not all, mutual funds areactively managed. This requires the fund manager to make daily or even hourly trading decisions.

An index fund – whether structured as a mutual fund or ETF – takes a more passive approach. There is no fund manager actively managing an index fund since the fund is tracking the performance of an index. Index funds aim to buy and hold the securities that coincide with the indexes they track. Therefore, there is no need to buy and sell securities regularly. This is one of the biggest differentiators of index funds vs. mutual funds.

Since there is no fund manager actively managing an index fund, the fund’s performance is solely based on the price movement of the shares within the fund itself. However, with an actively managed mutual fund, the performance is based on the investment decisions the fund managers make. Fund managers are free to choose the securities that best meet the investment objective and character of the fund.

There is a constant debate on which is better, actively or passively managed funds. According to the SP Indices, 78% of large-cap funds underperformed the S&P 500 within five years. This highlights that even though the market has experienced high volatility in the last few years, active funds don’t necessarily yield better-performing funds.

Investment Goals

Another difference is the investment objective each type of fund offers. With index funds, the goal is to simply mirror the performance of an index, while with a mutual fund, the objective is to outperform the market. Essentially, actively managed funds strategically select investments that will yield a higher return than the market.

Investors who seek higher-than-average returns may be more drawn to mutual funds. However, since there is more work required to actively manage a mutual fund, it may cost more. This leads us to our next big difference.

Costs of Investing

Running an actively managed fund generally costs more than running an index fund. This is because actively managed funds tend to have more expenses such as fund managers’ salaries, bonuses, office space, marketing and other operational expenses. Usually, the shareholders absorb these costs with a fee known as the mutual fund expense ratio.

It’s important to note that the higher the investment fees are, the more they dip into your returns. If you purchase shares of an actively managed fund expecting to yield above-average returns, you may be disappointed, especially if the fund underperforms.

However, index funds have fees as well, though the lower cost of running such a security usually results in lower fees. Remember, the lower the management fees, the more the shareholder can receive in returns.

Bottom Line

Some, but not all, mutual funds are index funds. An index fund, which can be either a mutual fund or an ETF, tracks a particular market index with the goal of matching its performance. Mutual funds and index funds can be great options for folks who don’t want to take theDIY approachto investing.But before you invest in either type of fund, it’s important to make sure you understand how that fund works, what the investment objective is and what fees the fund has. Remember that the fees of an index fund or mutual fund can dip into your returns.

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