More than $30 trillion sits in investment funds across the United States, according to the Investment Company Institute. That's roughly the size of the entire U.S. economy. Yet many new investors still feel lost on the difference between a mutual fund and an ETF.
Investment funds all share one core idea: pool money from many people to buy a diversified basket of assets. The differences come down to structure, cost, and how you trade them.
This guide breaks down the main types of investment funds, what they cost, and how to figure out which fits your goals. Past performance doesn't guarantee future results, so think of this as a map, not a recommendation.
Our Top Picks
These commonly available funds and brokers show up on most beginner shortlists. They are not personal recommendations, just well-known options that combine low fees with broad diversification.
- Where to buy: Robinhood for commission-free trades on most ETFs and stocks
- Total market ETF style: Fidelity ZERO Total Market Index Fund (FZROX)
- S&P 500 fund: Vanguard 500 Index Fund Admiral Shares (VFIAX)
- Schwab broad-market index: Schwab S&P 500 Index Fund (SWPPX)
- Bond exposure: Vanguard Total Bond Market Index Fund (VBTLX)
Each option keeps costs low while spreading your money across many holdings. That combination is the heart of most successful long-term portfolios.
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The Main Types of Investment Funds
Not all investment funds work the same way. Knowing the categories helps you compare options without getting fooled by marketing.
Mutual Funds
Mutual funds are pooled investments priced once a day after markets close. You can only buy or sell at that closing price.
They are often the default option inside 401(k) plans and IRAs. Minimum investments range from $0 to $3,000 depending on the fund.
Exchange-Traded Funds (ETFs)
ETFs trade on stock exchanges throughout the day, just like individual stocks. The price changes by the minute based on supply and demand.
They often have lower expense ratios than equivalent mutual funds. ETFs also tend to be more tax-efficient because of how they handle redemptions.
Index Funds
Index funds, which can be structured as either mutual funds or ETFs, track a benchmark like the S&P 500. They use a rules-based approach rather than human stock-picking.
Low fees and broad diversification make them a foundation for many beginner portfolios.
Actively Managed Funds
These funds employ a manager or team to pick stocks or bonds in hopes of beating the market. Expense ratios are higher, often between 0.50% and 1.50%.
Studies show most actively managed funds underperform their index after fees over long periods. A few do beat the market, but they are hard to identify ahead of time.
Money Market Funds
Money market funds hold very short-term debt and aim to keep their share price stable. Returns are modest but the funds are lower risk than stock or bond funds.
Many investors use them as a parking spot for cash inside a brokerage account.
Specialty Funds
Real estate, commodity, target-date, and sector funds all fall here. Each focuses on a narrow slice of the market.
They can play a role in a portfolio, but rarely as the main holding for a beginner.
What Fees Look Like
Funds charge a yearly expense ratio expressed as a percentage of assets. The fee is deducted automatically from returns.
Index ETFs often charge 0.03% to 0.15%. Index mutual funds run similar. Actively managed funds typically charge 0.50% to 1.50%.
A 1% fee on $100,000 over 30 years can cost more than $200,000 in lost compounding. That's why fee awareness is foundation-level investing knowledge.
How to Buy Investment Funds
Most people buy investment funds in one of three places.
Workplace Retirement Plans
Your 401(k) or 403(b) gives you a curated list of fund choices. The plan administrator handles the buying and selling.
Online Brokerages
An IRA or taxable brokerage account opens up the full menu of funds. Modern apps make funding and trading simple. Our Robinhood review covers what one popular option includes.
Fund Companies Directly
Vanguard, Fidelity, and Schwab all let you open accounts directly with them. This can mean lower fees on their own funds and zero account minimums for IRAs.
Matching Investment Funds to Goals
The right fund depends on the goal, time horizon, and risk tolerance.
For retirement decades away, broad stock index funds usually carry the heavy lifting. Bond funds gradually take a bigger role as retirement nears.
For a house down payment in three years, money market funds or short-term bond funds may fit better. Stock funds can drop sharply in any 12-month window.
For an emergency fund, a high-yield savings account or money market fund stays safer than any stock fund.
Common Beginner Questions About Investment Funds
The biggest mistake is chasing whatever fund had the best year. Mean reversion is real, and last year's winner is often next year's laggard.
The second biggest mistake is owning too many funds. Five overlapping U.S. stock funds give you almost the same diversification as one, with five times the paperwork.
The third is panicking during market drops. Long-term wealth usually comes from sticking with the plan through both calm and stormy years.
Frequently Asked Questions
Are investment funds safer than individual stocks?
Investment funds spread risk across many holdings, so a single failure doesn't sink the portfolio. They still go up and down with the market. They tend to be lower risk than concentrated stock picks, but they are not risk-free.
How much money do I need to start with investment funds?
Many ETFs let you start with the price of one share, sometimes under $50. Brokerages that offer fractional shares allow even smaller amounts, often $1. Some traditional mutual funds still require $1,000 to $3,000 minimums.
Should I invest in mutual funds or ETFs?
For a taxable brokerage account, ETFs often win on cost and tax efficiency. Inside a 401(k) or IRA, traditional mutual funds work fine and may be easier with automatic contributions. Many investors hold a mix of both.
How are investment funds taxed?
Funds inside a 401(k), IRA, or Roth IRA grow tax-deferred or tax-free, depending on the account. In a taxable brokerage account, dividends and capital gains are taxed in the year they happen. Holding funds for more than a year before selling qualifies long-term gains for a lower tax rate.
