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Start by deciding what market exposure and level of risk fit your long-term plan. Then compare funds tracking a suitable, diversified index on total costs, holdings, tracking approach, and how the fund works in your account. A low expense ratio matters, but it does not by itself make a fund the right choice.
This guide is for U.S. investors. It is general education, not an individualized investment or tax recommendation.
Choose the exposure before comparing fund fees
An index fund is a mutual fund or exchange-traded fund (ETF) that seeks to track a benchmark. You cannot buy the index itself; you buy shares in a fund that holds securities intended to follow it. The fund may own every security in the index or use a representative sample, and some funds may use derivatives. The index’s composition and weighting method shape what you actually own. The SEC’s Investor Bulletin: Index Funds explains these mechanics.
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Before screening by cost, identify the market, asset class, geography, or segment you want the fund to cover. A fund tracking a broad U.S. stock-market index and one tracking a narrow industry index are not interchangeable, even if both are labeled index funds. Likewise, a low-cost stock fund may not fit a plan that calls for a different balance of asset types.
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The SEC’s 2026 investor guidance says asset allocation depends on an investor’s risk tolerance and timeframe. A fund should fit the role you intend it to play in your overall plan, rather than determine the plan by default. See Investor.gov Tips for 2026.
Inspect the index and the fund’s actual holdings
“Index” does not automatically mean broadly diversified. Read how the benchmark is constructed and weighted, then look at the fund’s current holdings. Check whether a few securities account for a large share of the portfolio and whether the holdings overlap with investments you already own. Different funds can appear to offer distinct exposures while holding many of the same securities.
Extra scrutiny is useful for custom-built, smart-beta, quantitative, or otherwise non-traditional indexes. These indexes can use more complex rules and typically have higher expenses than traditional index funds. The SEC advises investors to understand an index’s construction to judge whether a fund adds diversity to a portfolio; see its Investor Bulletin: Smart Beta, Quant Funds and other Non-Traditional Index Funds.
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The expense ratio is a common measure of a fund’s annual operating expenses, expressed as a percentage of fund assets, and is shown in the prospectus. Use the prospectus fee table as a starting point, but check what else you may pay to buy, hold, and sell the investment. The SEC’s 2025 guide to how fees and expenses affect an investment portfolio explains why fees leave less money invested and earning returns.
- Fund charges: Check for sales loads, transaction fees, and any share-class fee differences.
- Account and trading charges: Your brokerage may charge commissions or annual account fees. For ETFs, consider the bid-ask spread when relevant to your trades.
- Costs within the portfolio: Trading securities creates costs that may not appear in the expense ratio. The same is true of some costs associated with activities such as securities lending.
“Zero expense” marketing does not necessarily mean no costs. Ask the SEC’s recommended question: “What fees and expenses can I expect to pay for buying, owning, and selling this fund?” The SEC’s Mutual Fund and ETF Fees and Expenses bulletin discusses charges beyond the expense ratio. FINRA’s Fund Analyzer can help compare fees and costs for certain mutual funds and ETFs; it is a comparison tool, not a personalized recommendation.
Cost differences can compound, but a fee comparison is not a forecast. In its 2025 fee bulletin, the SEC provides a hypothetical illustration—not observed investor results—in which $100,000 grows at 4% annually for 20 years under different annual fee assumptions. The illustration shows how fees affect an investment over time; it does not predict returns.
Check how closely the fund tracks its benchmark
An index fund seeks to follow its index; it does not guarantee the index’s return. A fund using representative sampling may hold a subset of benchmark securities, and fees, trading costs, and tracking error can all contribute to differences between fund performance and index performance. The fund also inherits the risks of the securities in its index, and a passive strategy may have less flexibility to respond to market declines.
Review the prospectus and shareholder report for the fund’s approach and its reported performance relative to the benchmark. Past tracking is useful context for understanding implementation, not assurance that the fund will track as closely in the future. The SEC’s index-fund bulletin describes these risks and notes that not every index fund costs less than an actively managed fund.
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Mutual funds and ETFs can both provide diversified exposure and follow passive strategies, but their trading mechanics and fee structures differ. Compare the specific fund and the account where you plan to hold it rather than assuming one wrapper is always better.
Tax treatment depends on context. The SEC says ETFs have historically had tax advantages in some circumstances, but there is no ETF-versus-mutual-fund tax difference when the investment is held in a tax-advantaged account such as a 401(k) or IRA. Consider your account type and tax situation; for personal tax guidance, consult a qualified professional. See the SEC’s Characteristics of Mutual Funds and Exchange-Traded Funds (ETFs).
Use a consistent checklist to compare candidates
- Write down the intended exposure. Specify the market or asset class, geography, and segment you want, and how the holding fits your timeframe, risk tolerance, and overall allocation.
- Read the index methodology. Identify what the benchmark includes, how it weights securities, and whether its rules are traditional and broad or targeted and custom-built.
- Review holdings and overlap. Check concentration in the largest positions and compare holdings with your other investments.
- Read current fund disclosures. Compare the prospectus fee table, expense ratio, investment approach, risks, and shareholder report. Fund expenses and holdings can change, so use current documents.
- Estimate costs in your account. Include fund charges, brokerage commissions, account fees, ETF bid-ask spreads where applicable, and portfolio costs identified in the disclosures.
- Compare tracking and structure. Consider the fund’s tracking history and whether its mutual-fund or ETF mechanics suit your account and tax context.
- Ask whether the fund fits the plan. Consider the SEC’s questions: “What specific risks are associated with this fund?”, “How is the makeup of the fund’s index determined?”, and “How does the fund’s investment strategy fit with my investment goals?”
The SEC’s Investor Bulletin: Index Funds puts the cost comparison in perspective: “If the holdings of two funds have identical performance, the fund with the lower cost generally will generate higher returns for you.” That comparison assumes identical holdings performance; real candidates can differ in exposure, costs, tracking, and risk.
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