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A mutual fund pools money from many investors to buy a collection of stocks, bonds, or other assets. It is one of the most common ways people invest for retirement and long-term goals. This guide explains how mutual funds work, what they cost, and how to pick the right one.
How a Mutual Fund Works
When you buy shares of a mutual fund, your money is combined with money from other investors. A professional fund manager uses that pool of money to buy securities. The fund’s value goes up or down based on the performance of those securities.
For example, if a mutual fund owns 100 different stocks and those stocks rise in value, your fund shares rise in value too. You own a slice of the whole portfolio, even if you only invested $500.
Types of Mutual Funds
Stock (Equity) Funds
Stock funds invest mainly in company shares. They aim for growth over time. They carry more short-term risk than bond funds but have historically produced higher long-term returns.
Bond (Fixed Income) Funds
Bond funds invest in government or corporate bonds. They aim to produce steady income. They are generally less volatile than stock funds, making them popular for conservative investors or those near retirement.
Balanced Funds
Balanced funds mix stocks and bonds in one portfolio. A common split is 60% stocks and 40% bonds. They offer growth potential with some protection against market drops.
Index Funds
Index funds track a market index like the S&P 500. They are not actively managed, so they charge very low fees. Many financial experts recommend index funds for most investors. See our full guide on How to Invest in Index Funds.
Money Market Funds
Money market funds invest in short-term, low-risk securities. They aim to keep a stable $1 per share value. They are not the same as money market accounts at banks, though they work similarly.
Mutual Funds vs ETFs
Exchange-traded funds (ETFs) are similar to index mutual funds but trade on a stock exchange throughout the day like a stock. Mutual funds only price once per day, after the market closes. For most long-term investors, this difference does not matter much. ETFs often have slightly lower costs.
How Mutual Fund Fees Work
Expense Ratio
The expense ratio is the annual fee the fund charges as a percentage of your investment. A 0.05% expense ratio on a $10,000 investment costs $5 per year. A 1.0% expense ratio costs $100 per year. Over 30 years, the difference is enormous. Always check the expense ratio before investing.
Load Fees
Some mutual funds charge a sales commission called a load. A front-end load is charged when you buy. A back-end load is charged when you sell. No-load funds charge no sales commission. Choose no-load funds whenever possible.
12b-1 Fees
These are marketing and distribution fees some funds charge. They are included in the expense ratio. Avoid funds with high 12b-1 fees.
How to Buy a Mutual Fund
- Open a brokerage or retirement account (Fidelity, Vanguard, Schwab are popular choices)
- Search for a mutual fund by name or ticker symbol
- Check the minimum investment (many funds start at $1,000 to $3,000; some have no minimum)
- Review the expense ratio and investment strategy
- Place your purchase order
Your order will execute at the end-of-day price, called the net asset value (NAV).
Mutual Funds in Retirement Accounts
Most 401(k) plans offer a lineup of mutual funds. When you contribute to a 401(k), you choose how to allocate your money among those funds. Index funds in a 401(k) are one of the most cost-effective ways to build retirement wealth. You can also hold mutual funds in an IRA. See our guide to How to Open a Roth IRA.
Pros and Cons of Mutual Funds
| Pros | Cons |
|---|---|
| Instant diversification | Fees can eat returns over time |
| Professional management | No intraday trading |
| Easy to invest small amounts | Capital gains distributions can trigger taxes |
| Widely available in 401(k)s | Less transparent than individual stocks |
Frequently Asked Questions
What is the minimum investment for a mutual fund?
Minimums vary. Many mutual funds require $1,000 to $3,000 to start. Some index funds at Fidelity have no minimum. 401(k) contributions usually have no minimum per fund.
Are mutual funds safe investments?
Mutual funds are not guaranteed. Their value can go up or down. However, diversified stock mutual funds have historically recovered from downturns over long periods. Risk depends on the fund type.
How are mutual fund profits taxed?
Mutual funds can distribute capital gains and dividends, which are taxable in a regular brokerage account. In a tax-advantaged account like an IRA or 401(k), taxes are deferred or eliminated.
Rates as of May 2026. Rates change frequently. Verify current rates directly with each institution before applying.