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How to Invest in Index Funds at Fidelity: A Complete Guide

Investing in index funds Fidelity gives you a disciplined path to long term growth while reducing the time spent picking individual stocks. With Fidelity’s platform, you can a...

Mara Ellison Jul 24, 2026
How to Invest in Index Funds at Fidelity: A Complete Guide

Investing in index funds Fidelity gives you a disciplined path to long term growth while reducing the time spent picking individual stocks. With Fidelity’s platform, you can access low cost index funds across asset classes and use streamlined tools to monitor progress.

The table below outlines core options, fee ranges, and Fidelity’s tools that help you implement index strategies with confidence.

Index Type Example Ticker at Fidelity Typical Expense Ratio Best For
U.S. Total Stock Market FZROX (No Transaction Fee) 0.00% Core U.S. equity exposure
S&P 500 Index FXAIX 0.015% Large cap U.S. growth
International Stock Index FTIHX 0.145% Developed and emerging markets
U.S. Bond Index FXNAX 0.10% Income and stability

Getting started with Fidelity index funds

Begin by defining your investment goals, time horizon, and risk tolerance, then choose the account type that fits, such as an IRA or brokerage account. Fidelity’s fund screeners let you filter by index funds, expense ratio, and asset class so you can compare options like FZROX and FXAIX at a glance.

After opening or selecting an account, you can set up automatic investments to dollar cost average into your chosen index funds, which helps reduce the impact of market volatility over time. Use Fidelity’s research tools, fact sheets, and analyst ratings to validate your choices before you execute each trade.

Understanding total cost and long term impact

Focus on the expense ratio, trading commissions, and any account fees, since these costs compound over years of investing. Fidelity’s no transaction fee funds like FZROX eliminate commissions on purchases and sales, keeping more of your returns.

Use Fidelity’s fee calculators and projected return scenarios to model how small savings in expense ratios can grow over decades. Pairing low cost index funds with automatic contributions and periodic rebalancing can improve net performance without active trading.

Diversification strategies across asset classes

Build a diversified portfolio by combining U.S. total market, international stock, and bond index funds to spread risk across regions and asset types. You can follow a simple three fund portfolio approach using one U.S. stock index, one international stock index, and one bond index fund offered on Fidelity.

Adjust the allocation between stocks and bonds based on your age, income stability, and comfort with market swings, then let the index funds do the heavy lifting of tracking their benchmarks. Rebalance annually or when allocations drift significantly to maintain your target risk level without chasing performance.

Using Fidelity tools to monitor performance

Track your holdings in Fidelity’s portfolio dashboard to see gains, losses, asset allocation, and sector exposure in real time. Set up alerts for low balance issues, corporate actions, or threshold rebalancing so you stay informed without constantly checking prices.

Leverage Fidelity’s tax efficiency tools, such as tax loss harvesting and fund placement strategies, to help optimize after tax returns in taxable accounts. Consistent review and minimal trading keep costs low and allow your index fund compounding to work efficiently.

Next steps for building a low cost index portfolio with Fidelity

  • Define your long term goals, risk tolerance, and preferred asset allocation.
  • Open a Fidelity IRA or brokerage account if you do not already have one.
  • Select low cost index funds such as FZROX, FXAIX, or FTIHX to match your target allocation.
  • Set up automatic contributions and schedule periodic rebalancing.
  • Use Fidelity’s research, fee calculators, and dashboards to monitor progress and keep costs low.

FAQ

Reader questions

How do I choose between FZROX and FXAIX at Fidelity?

Choose FZROX if you want a no commission, no minimum fund with a 0.00% expense ratio for total U.S. market exposure, and select FXAIX if you prefer a slightly higher fee structure but like the familiarity of a long established S&P 500 index fund.

Can I set up automatic monthly investments into index funds on Fidelity?

Yes, you can schedule automatic deposits and systematic purchases through your Fidelity account, which lets you implement dollar cost averaging into any index fund you are holding without manual intervention each period.

Will Fidelity charge me commissions when I invest in index funds like FTIHX?

Fidelity does not charge commissions for purchases or sales of index funds, and the platform offers commission free trading on many no transaction fee funds, helping you keep more of your investment returns.

How often should I rebalance my index fund portfolio on Fidelity?

Many investors rebalance annually or when an asset class deviates from your target allocation by several percentage points, using Fidelity’s portfolio tools to execute trades and maintain your intended risk level.

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