The Most Accessible Path to Long-Term Wealth
Investing in the stock market has never been more accessible to ordinary Americans. No-minimum brokerage accounts, fractional shares, commission-free trading, and straightforward index fund options have removed the practical barriers that once kept many households from building investment portfolios. Yet despite this accessibility, the majority of American households still do not participate meaningfully in equity markets beyond their employer-sponsored retirement accounts — leaving decades of potential wealth growth uncaptured.
The S&P 500 returned 16.4 percent in 2025, according to Empower’s year-end financial review. Empower projects an additional 14 percent return in 2026, continuing a long-term trend that has made U.S. equity index investing one of the most reliable wealth-building strategies in the history of personal finance. For new investors, the question is not whether to start — the data on starting early versus starting late is unambiguous — but how to start in a way that is rational, manageable, and built on sound principles that actually hold up through inevitable market volatility.
What Is an Index Fund and Why Does It Beat Most Alternatives?
The Basic Concept
An index fund is a type of investment fund — available either as a mutual fund or an exchange-traded fund (ETF) — that tracks the performance of a specific market index by holding the same securities in the same proportions as that index. The S&P 500 index represents the 500 largest publicly traded U.S. companies by market capitalization. An S&P 500 index fund holds those 500 companies in proportion to their market weight, meaning its performance closely mirrors the index itself — capturing the collective performance of America’s largest businesses.
Why Index Funds Outperform Active Management Over Time
Index funds do not attempt to beat the market through stock selection or active management — they simply match it. This sounds modest until you consider the evidence. S&P Global’s 2025 SPIVA report found that approximately 85 to 90 percent of actively managed funds fail to outperform their benchmark index over a 15-year period after fees. By accepting market returns rather than pursuing excess returns, index fund investors typically outperform the majority of professional stock pickers over long time horizons — not because index fund investors are smarter, but because they are not paying the costs that active management requires.
Why Fees Are One of the Most Important Variables
The expense ratio — the annual fee charged as a percentage of assets under management — is one of the most important determinants of long-term index fund performance, and one of the most underestimated by beginning investors. A fund tracking the S&P 500 with an expense ratio of 0.03 percent (like Vanguard’s VOO) versus one charging 0.75 percent will produce dramatically different outcomes over decades. On a $50,000 investment growing at 8 percent annually over 30 years, the difference between a 0.03 percent and 0.75 percent expense ratio is approximately $58,000 in additional final wealth. Fee minimization is not a minor optimization — it is one of the highest-leverage decisions in long-term investing.
Step 1 — Choose the Right Account Type
Before selecting funds, choose the right account structure. Tax-advantaged accounts shelter investment growth from annual taxation, dramatically improving long-term outcomes compared to taxable accounts. The priority order for most beginning investors: capture any employer 401(k) match first, then maximize a Roth or Traditional IRA, then invest additional amounts in a taxable brokerage account.
| Account Type | Tax Treatment | 2026 Contribution Limit | Best For |
| 401(k) — Traditional | Pre-tax contributions; taxed at withdrawal | $24,500 (under 50); $31,000 (50+) | Reducing current taxable income; capturing employer match |
| Roth IRA | After-tax; tax-free growth and withdrawals | $7,000 (under 50); $8,000 (50+) | Tax-free retirement wealth; younger / lower-bracket investors |
| Traditional IRA | Pre-tax or after-tax; taxed at withdrawal | $7,000 (under 50); $8,000 (50+) | Deductible contributions if no workplace plan available |
| HSA (if eligible) | Triple tax advantage | $4,300 individual; $8,550 family | High-deductible health plan holders — the most tax-efficient account |
| Taxable brokerage | No tax advantage; capital gains and dividend taxes apply | No limit | Investing beyond tax-advantaged account limits |
Step 2 — Select a Brokerage Platform
For most beginning investors, the choice between Fidelity, Vanguard, and Charles Schwab is the primary brokerage decision. All three offer commission-free trading, low-cost index funds, no account minimums for standard accounts, and robust educational resources. Fidelity and Schwab offer fractional share investing, allowing you to invest any dollar amount regardless of individual share price — particularly useful for beginning investors working with smaller amounts.
- Fidelity (fidelity.com): zero-expense-ratio index funds (FZROX, FZILX), excellent educational resources, fractional shares, strong mobile app — the best overall choice for most beginners
- Vanguard (vanguard.com): originator of the index fund concept, owned by its fund shareholders which aligns incentives, industry-low expense ratios, mutual fund and ETF options
- Charles Schwab (schwab.com): no minimums, strong customer service, fractional shares through Schwab Stock Slices, solid index fund lineup
- Betterment (betterment.com): robo-advisor that automatically builds and rebalances an index fund portfolio for 0.25% annual fee — appropriate for investors who prefer full automation over DIY
Step 3 — Choose Your Index Funds: The Core Three-Fund Portfolio
For most beginning investors, a three-fund portfolio provides comprehensive global diversification with minimal complexity. Popularized by the Bogleheads investing community (named after Vanguard founder John Bogle), this approach consists of a U.S. total stock market index fund, an international total stock market index fund, and a U.S. bond index fund. The allocation between these three funds should reflect your investment time horizon and risk tolerance — investors with longer time horizons hold more in stocks and less in bonds.
| Fund | Ticker | Expense Ratio | What It Holds |
| Fidelity ZERO Total Market Index | FZROX | 0.00% | Total U.S. stock market — all U.S. publicly traded companies |
| Vanguard Total Stock Market ETF | VTI | 0.03% | Total U.S. stock market — approximately 3,600 companies |
| Vanguard S&P 500 ETF | VOO | 0.03% | 500 largest U.S. companies by market cap |
| Vanguard Total International Stock ETF | VXUS | 0.07% | Global ex-U.S. market — approximately 7,600 international companies |
| Fidelity ZERO International Index | FZILX | 0.00% | International stock market (non-U.S.) |
| Vanguard Total Bond Market ETF | BND | 0.03% | U.S. investment-grade bonds — government and corporate |
Step 4 — Apply Dollar-Cost Averaging
Dollar-cost averaging means investing a fixed dollar amount at regular intervals — weekly, biweekly, or monthly — regardless of whether the market is up or down. When prices are higher, your fixed investment buys fewer shares. When prices are lower, it buys more. Over time, this produces an average cost per share that is lower than the average market price over the same period.
Beyond its mathematical benefits, dollar-cost averaging solves the behavioral problem that derails most new investors: the fear of investing at the wrong time. By committing to a schedule and automating it, you eliminate the need to time the market — a skill that professional fund managers with multibillion-dollar research budgets consistently fail to execute reliably. DALBAR’s 2025 Quantitative Analysis of Investor Behavior found that the average equity fund investor earned 5.5 percent annually over 30 years while the S&P 500 returned 10.8 percent — a 5.3 percentage point gap driven almost entirely by poorly timed buying and selling decisions.
Step 5 — Automate and Commit to Staying the Course
The most important long-term investment decision you will make is not which index fund to choose — it is whether you stay invested during market downturns. Every significant stock market decline in U.S. history has been followed by recovery to new highs. The 2020 COVID-19 crash (34 percent decline) fully recovered within five months. The 2022 bear market (19.4 percent decline) was followed by a 26 percent gain in 2023 and 25 percent in 2024. Investors who sold during downturns and missed the recovery permanently impaired their returns. Investors who automated contributions and ignored short-term volatility captured the full market return.
Automate your contributions on payday. Set your portfolio to reinvest dividends automatically. Review your asset allocation annually and rebalance if any component has drifted more than 5 percentage points from your target. Beyond that: the optimal action is inaction.
Frequently Asked Questions
How much money do I need to start investing in index funds?
With fractional share investing available at Fidelity and Schwab, you can begin with as little as $1. Fidelity’s ZERO index funds have no minimum investment. Vanguard’s ETFs can be purchased for the price of a single share. There is no practical minimum that should prevent starting. The most important variable is not the starting amount but the consistency and duration of contributions — a $100 monthly investment maintained for 30 years at 7 percent annual returns grows to approximately $113,000. Starting now matters more than starting with a larger amount.
Is now a good time to invest given market uncertainty?
For long-term investors with a time horizon of 10 or more years, there is no consistently identifiable wrong time to start investing in diversified index funds. Research on market timing consistently shows that time in the market — being invested continuously — produces better outcomes than timing the market for the vast majority of individual investors. ‘Waiting for the right time’ has historically meant missing significant market gains while waiting for a decline that either does not come or does not come at the expected magnitude. Start with your planned contribution amount and automate future contributions.
What is the difference between an index fund and an ETF?
Both can track the same index and both are excellent vehicles for index investing. The structural difference is that mutual fund index funds are priced once per day after market close, while ETFs trade throughout the day on exchanges like individual stocks. For long-term investors making regular contributions, this difference is largely irrelevant. ETFs have slight tax efficiency advantages in taxable accounts because of their in-kind creation and redemption mechanism. Both offer similarly low expense ratios when selecting comparable products from the same fund family. For a beginning investor, the choice between an S&P 500 mutual fund and an S&P 500 ETF matters far less than simply choosing a low-cost option and starting.
How do I decide on the right stock-to-bond allocation?
A common starting point is subtracting your age from 110 to get your stock allocation percentage — a 30-year-old would hold 80 percent stocks and 20 percent bonds. This is a rough heuristic. Your specific risk tolerance (how much can you stomach watching your portfolio decline 30 percent without selling?), income stability, and investment timeline should inform the actual allocation. Target-date funds automate this allocation decision entirely, gradually shifting toward bonds as your target retirement date approaches. For investors who are uncertain, a Vanguard Target Retirement fund or Fidelity Freedom Index fund appropriate for your expected retirement year provides a simple, professionally managed allocation in a single fund.
Sources and References
Empower — empower.com — 2025 Annual Return Data and 2026 Financial Wellness Investment Outlook
S&P Global — spglobal.com — SPIVA U.S. Scorecard 2025 — active vs. passive fund performance over 1, 5, 10, and 15 years
DALBAR — dalbar.com — 2025 Quantitative Analysis of Investor Behavior — investor return vs. index return gap
Fidelity — fidelity.com — index fund options, expense ratios, and investment education resources
Vanguard — vanguard.com — John Bogle index fund philosophy and Bogleheads three-fund portfolio research
IRS — irs.gov — 2026 retirement account contribution limits
