Where to buy index funds

You buy index funds through a brokerage account — a company that holds your money and executes trades. The most common brokerages for individual investors are Fidelity, Vanguard, Charles Schwab, E-Trade, and Robinhood. Each one lets you open an account online, deposit money, and purchase index funds through their platform.

You do not buy index funds directly from the fund company. Even if you want a Vanguard index fund, you typically open a Vanguard brokerage account to hold it. Some brokerages charge trading fees; others do not. Vanguard, Fidelity, and Schwab charge zero commission on most index fund purchases, which is standard now.

The brokerage you choose matters mainly for fees, user interface, and customer service. If you are starting small, any of the major brokerages will work. If you already have a bank or investment account somewhere, that institution may offer brokerage services too.

Key Takeaways

  • You need a brokerage account to buy index funds; Fidelity, Vanguard, Schwab, and E-Trade are the most common choices for beginners.
  • Most major brokerages charge zero commission on index fund purchases, so the main difference between them is the user interface and fund selection.
  • You must choose between a regular taxable account and a tax-advantaged account like an IRA or 401(k), which changes how your gains are taxed.
  • Once your account is open and funded, you search for the index fund by name or ticker symbol and place a buy order just like buying a stock.
  • Index funds are purchased at the end-of-day price, not instantly, so the exact price you pay depends on when the market closes.

Types of accounts: taxable versus tax-advantaged

Before you buy, decide what type of account to use. A taxable brokerage account has no contribution limits and no withdrawal restrictions. You pay taxes on dividends and capital gains every year. This is the simplest account type and the one to use if you have already maxed out retirement accounts or do not have access to an employer 401(k).

A tax-advantaged account — such as a Traditional IRA, Roth IRA, or 401(k) — lets your money grow without paying taxes on gains each year. The trade-off is contribution limits (usually $6,500 to $7,000 per year for IRAs in 2024, though this varies) and age-based withdrawal rules. Most people should max out a tax-advantaged account before using a taxable account, because the tax savings compound over time.

If your employer offers a 401(k) match, contribute enough to get the full match first — that is assistance programs. Then open an IRA if you want to invest more. The order matters because each account type has different rules and limits.

Opening a brokerage account

Opening an account takes 10 to 20 minutes online. You will need your Social Security number, a government-issued ID, your address, and employment information. The brokerage will ask whether you want a taxable account, a Traditional IRA, a Roth IRA, or another type. Choose based on the section above.

After you submit the application, the brokerage verifies your identity and approves the account, usually within one business day. Some brokerages let you start trading immediately; others wait for the approval to complete. Once approved, you can deposit money by linking a bank account or mailing a check.

Linking a bank account is faster. The brokerage will ask for your bank's routing number and your account number, then run a small test deposit to confirm the link works. After that, you can transfer money in and out whenever you want, usually within one to three business days.

Finding and purchasing a specific index fund

Once your account is funded, log into the brokerage platform and search for the index fund you want. You can search by name (for example, "Vanguard Total Stock Market Index Fund") or by ticker symbol (for example, VTSAX for Vanguard's mutual fund version, or VTI for the exchange-traded fund version). The ticker symbol is faster and less error-prone.

The search will show you the fund's details: its expense ratio (the annual fee), its holdings, and its performance history. Read the expense ratio carefully — it is the only cost you pay directly. For index funds, this is usually between 0.03% and 0.20% per year. Avoid anything above 0.50% unless you have a specific reason.

Click "Buy" or "Trade" and enter the amount you want to invest. You can buy a dollar amount (for example, $500) or a number of shares. The platform will show you the current price and calculate how many shares you will receive. Review the order, then confirm. The trade executes at the market close that day, so you will not know the exact price until after 4 p.m. Eastern Time.

Mutual funds versus exchange-traded funds

Most index funds come in two forms: mutual funds and exchange-traded funds (ETFs). Both track the same index and have similar expense ratios. The main difference is how they trade. Mutual funds execute once per day at the closing price. ETFs trade throughout the day like stocks, so you can buy or sell at any time.

For a beginner buying and holding, this difference rarely matters. Mutual funds are slightly simpler because you do not have to worry about bid-ask spreads or intraday price swings. ETFs are more flexible if you want to trade during market hours. Most brokerages now offer both, so you can choose based on preference.

Some index funds are available only as mutual funds (like Vanguard's VTSAX) or only as ETFs (like Vanguard's VTI). Check your brokerage's fund list to see what is available. If you want a specific fund and your brokerage does not carry it, you can usually switch brokerages or buy a similar fund from a different provider.

What happens after you buy

After your order executes, the shares appear in your account. You own them outright. The fund will pay dividends (usually quarterly or annually), which your brokerage will reinvest automatically unless you change the setting. You do not have to do anything — the index fund tracks its index automatically, and the fund manager rebalances it as needed.

Your account will show your current balance, your total gain or loss, and your cost basis (what you paid). If you are in a taxable account, you will receive a tax form at the end of the year showing your dividends and capital gains. If you are in a tax-advantaged account, you do not report anything until you withdraw.

You can buy more shares anytime by depositing more money and placing another order. You can also set up automatic monthly or weekly transfers from your bank, which many brokerages call "automatic investment plans." This removes the decision of when to buy and is a common way to build wealth over time.

Common mistakes to avoid

Do not confuse the fund company with the brokerage. You can buy a Vanguard index fund through Fidelity, or a Fidelity index fund through Vanguard. The brokerage is where you open the account; the fund company is who manages the fund. Both matter, but for different reasons.

Do not buy index funds with borrowed money or on margin unless you understand the risks. Margin lets you borrow from your brokerage to buy more shares, but you pay interest and can lose more than you invested. For beginners, stick to buying with cash you have on hand.

Do not panic-sell during market downturns. Index funds are designed for long-term holding. If you sell when the market drops, you lock in losses. If you hold, you recover when the market rises — and historically, it always has over periods longer than 10 years.

Frequently Asked Questions

Can I buy index funds through my bank?

Many banks offer brokerage services, but you usually have to open a separate brokerage account within your bank. Some banks charge higher fees or have limited fund selection. It is often cheaper and easier to open an account directly with a dedicated brokerage like Fidelity or Vanguard, even if you bank elsewhere.

What is the minimum amount I need to start?

Most brokerages have no minimum to open an account. However, some index funds have minimums of $1,000 to $3,000 for the first purchase. ETF versions of index funds have no minimums because you buy them one share at a time. If you have less than $1,000, look for an ETF version or a brokerage that offers fractional shares.

Do I pay taxes when I buy an index fund?

No. You only pay taxes on gains and dividends. In a taxable account, you pay taxes on dividends each year and on capital gains when you sell. In a tax-advantaged account like an IRA, you pay no taxes until you withdraw (or never, in a Roth IRA). Buying itself is not a taxable event.

How long does it take for my money to settle after I buy?

The trade executes at market close the day you place the order. The shares settle (become fully yours) two business days later. During those two days, you own the shares but cannot sell them. After settlement, you can sell, transfer, or hold them indefinitely.

Can I buy the same index fund at multiple brokerages?

Yes. You can own the same index fund in multiple accounts or at multiple brokerages. There is no penalty for this. Some people do it to spread risk across institutions or to take advantage of different account types. Just track your total holdings so you do not accidentally over-concentrate.