Investing in mutual funds in the US starts with opening an account at a brokerage firm, choosing funds that match your goals, and placing an order. The process is straightforward, but the details around account types, fees, and how trades actually work will shape your returns over time. Here’s what you need to know to get started and make informed choices along the way.
Pick the Right Account Type
Before you can buy a single fund share, you need an investment account. The type you choose affects how your money is taxed and when you can access it.
A taxable brokerage account is the most flexible option. You can deposit and withdraw money whenever you want, with no annual contribution caps. Most investors open a cash account, where you pay in full for every purchase. Margin accounts let you borrow against your holdings, but borrowing to buy mutual funds adds interest costs and risk that most beginners don’t need.
A traditional IRA or Roth IRA gives you tax advantages in exchange for restrictions on withdrawals. With a traditional IRA, contributions may be tax-deductible now, but you’ll owe income tax when you withdraw in retirement. A Roth IRA works in reverse: you contribute after-tax dollars, then withdrawals in retirement are tax-free. Both have annual contribution limits set by the IRS.
If your employer offers a 401(k), 403(b), or 457(b) plan, you can invest in mutual funds through payroll deductions. These plans often include an employer match, which is essentially free money. The fund menu is limited to whatever your plan administrator selected, but the tax deferral and matching contributions make workplace plans worth prioritizing.
Other tax-advantaged accounts like health savings accounts (HSAs) and 529 education savings plans also hold mutual funds, though each serves a specific purpose beyond general investing.
Where to Open Your Account
Most people buy mutual funds through an online brokerage or directly from a fund company. Large brokerages offer access to thousands of funds from many different providers, making it easy to compare options in one place. Fund companies like Vanguard let you buy their own funds directly, sometimes at lower minimums or with access to share classes not available elsewhere.
When choosing a platform, look at the number of no-transaction-fee funds available, the minimum investment requirements, and the quality of research tools. Some brokerages charge a transaction fee (often $20 to $75) each time you buy or sell certain funds, while others offer large selections of funds with no transaction fee at all.
Understand Fund Costs Before You Buy
Fees are one of the few factors you can control, and they have an outsized effect on long-term returns. A mutual fund’s expense ratio tells you what percentage of the fund’s assets goes toward operating costs each year. If a fund has a 0.50% expense ratio, you’re paying $5 annually for every $1,000 invested. That money comes out of the fund’s returns automatically, so you never see a separate charge on your statement.
Beyond the expense ratio, some funds charge sales loads, which are commissions paid when you buy or sell shares. A front-end load, typically between 2% and 5%, is deducted from your investment at purchase. Put $10,000 into a fund with a 4% front-end load, and only $9,600 actually gets invested. A back-end load (also called a contingent deferred sales charge) applies when you sell within a certain period, often six years, and usually shrinks the longer you hold. No-load funds skip these commissions entirely.
Funds may also charge 12b-1 fees, capped at 1% of assets per year, which cover marketing and distribution costs. These are baked into the expense ratio for most share classes but can vary significantly depending on which share class you buy.
Share Classes and What They Mean for You
Many funds offer multiple share classes, each with a different fee structure. Class A shares charge a front-end load but carry lower ongoing 12b-1 fees, which makes them cheaper over long holding periods. Class B shares skip the upfront charge but impose a back-end load if you sell early, plus higher annual fees. Class C shares have no front-end load and only a small back-end charge (often 1% if you sell within a year), but they carry higher ongoing costs indefinitely because they don’t convert to a cheaper share class.
Transaction shares, sometimes called “clean” shares, strip out front-end loads, back-end loads, and 12b-1 fees entirely. If your brokerage offers them, they’re typically the lowest-cost way to own a fund.
Minimum Investment Requirements
Unlike stocks or ETFs, many mutual funds require a minimum initial investment. These minimums vary by fund company and share class. At Vanguard, for example, target retirement funds start at $1,000, most actively managed funds require $3,000 for Investor Shares, and Admiral Shares (which carry lower expense ratios) require $3,000 for most index funds, $50,000 for most actively managed funds, and $100,000 for certain sector-specific index funds.
Other brokerages have introduced funds with no minimum at all, especially for their own proprietary index funds. If you’re starting with a small amount, look for funds or platforms that let you in with $0 or a low threshold. Workplace retirement plans typically waive minimums because you’re investing through regular payroll contributions.
How to Choose a Fund
Mutual funds generally fall into a few broad categories: stock (equity) funds, bond (fixed income) funds, balanced funds that hold both, and money market funds. Within each category, you’ll find further distinctions based on investment style (growth vs. value), company size (large-cap, mid-cap, small-cap), geography (domestic vs. international), and whether the fund is actively managed or tracks an index.
Index funds aim to match the performance of a benchmark like the S&P 500 by holding the same securities in the same proportions. Because they don’t require a team of analysts picking stocks, their expense ratios tend to be dramatically lower than actively managed funds. Actively managed funds try to beat the market, but research consistently shows that most fail to do so over long periods after accounting for their higher fees.
When evaluating a specific fund, check the expense ratio, the fund’s investment objective, its historical performance relative to its benchmark (keeping in mind that past performance doesn’t guarantee future results), and whether it holds the types of assets you want in your portfolio. Every fund publishes a prospectus and a summary prospectus that spell out these details.
How Mutual Fund Trades Work
Buying and selling mutual funds works differently from trading stocks. A mutual fund’s price, called its net asset value (NAV), is calculated once per day after the stock market closes at 4 p.m. Eastern. The NAV equals the fund’s total assets minus liabilities, divided by the number of shares outstanding.
When you place an order to buy or sell, you won’t know the exact price until the NAV is calculated that evening. If your order is submitted before the fund’s trade cutoff time (which varies by fund but can be as early as 2 p.m. Eastern), it will be filled at that day’s NAV. Orders placed after the cutoff execute at the next business day’s NAV. This means you can’t time mutual fund trades the way you might with stocks or ETFs that trade throughout the day.
Most mutual fund orders are placed in dollar amounts rather than share quantities. You might invest $500, and the fund will issue you however many shares (including fractional shares) that amount buys at the day’s NAV.
Tax Considerations for Taxable Accounts
If you hold mutual funds in a taxable brokerage account, you’ll owe taxes on two types of income each year: dividend distributions and capital gains distributions. Capital gains distributions happen when the fund’s managers sell securities inside the fund at a profit. The fund passes those gains to shareholders, and you owe taxes on them regardless of whether you reinvested the distribution or took the cash. These distributions are taxed at long-term capital gains rates of 0%, 15%, or 20%, depending on your income.
One detail that surprises many new investors: capital gains distributions can occur even in a year when the fund’s overall price declined. The fund may have sold some winning positions while its remaining holdings dropped in value. You could see your account balance fall and still receive a taxable distribution.
When you reinvest distributions, those reinvested amounts increase your cost basis (the amount you originally paid for your shares). This matters when you eventually sell, because your taxable gain is calculated as the sale price minus your cost basis. Keep good records, or use a brokerage that tracks cost basis automatically.
Funds held inside IRAs, 401(k)s, and other tax-deferred accounts don’t trigger annual taxes on distributions. You’ll pay taxes later, when you withdraw money in retirement. Municipal bond funds are an exception in taxable accounts: their income is generally exempt from federal taxes and often from state taxes as well.
Placing Your First Order
Once your account is open and funded, the actual purchase takes just a few steps. Search for the fund by name or ticker symbol, enter the dollar amount you want to invest, and confirm the order. Most brokerages let you set up automatic investments on a recurring schedule, which is a simple way to build the habit of regular investing and take advantage of dollar-cost averaging (buying more shares when prices are low and fewer when prices are high).
After your order executes, you’ll see the shares in your account the next morning along with the NAV at which they were purchased. From there, you can monitor performance, reinvest dividends automatically, or adjust your holdings as your goals evolve.