The Single Investment That Quietly Beats 90% of Wall Street — And Costs Almost Nothing

🕑 16 min read  ·  ✅ Fact-checked  ·  📋 Sources: IRS, CFPB, SEC

Every year, S&P Global publishes a research report called the SPIVA U.S. Scorecard. SPIVA stands for “S&P Indices Versus Active.” The report compares the performance of actively managed mutual funds — the ones run by professional Wall Street managers earning seven-figure salaries — against the performance of the unmanaged S&P 500 index. The results have been remarkably consistent for over twenty years.

Over any fifteen-year period, roughly 90 percent of actively managed U.S. equity funds underperform the S&P 500 index. Read that again. Ninety percent of the smartest, best-resourced, most expensive professional money managers in the world fail to beat a simple index that anyone with $50 can buy with a click. The implications for ordinary investors — especially immigrant families with limited margin for error — are profound.

This article explains what an index fund actually is, why it consistently beats the professionals, exactly which index fund to buy, and the small handful of situations where a different approach might make sense. By the end, you will understand why some of the wealthiest investors in the world recommend index funds to their own families — and why this single insight, applied early, is worth more than any number of stock picks.

What an index fund actually is

An index fund is a mutual fund or exchange-traded fund (ETF) that holds a basket of stocks designed to mirror a published index. The most famous index is the S&P 500, which contains the 500 largest publicly traded companies in the United States — names like Apple, Microsoft, Amazon, Johnson & Johnson, JPMorgan Chase, and so on. An S&P 500 index fund holds shares of all 500 companies in roughly the same proportions as the index itself.

When you buy a single share of an S&P 500 index fund, you become a tiny part-owner of all 500 companies simultaneously. If Apple rises 5 percent, your fund rises slightly. If JPMorgan falls 2 percent, your fund falls slightly. The blended movement of all 500 companies is the return of the index, minus a small operating fee.

The key concept is that the fund is unmanaged. No one is making decisions about which stocks to add or remove based on opinions about the economy. The fund simply mirrors the index, and the index changes only when companies grow into the top 500 (added) or shrink out of it (removed) according to objective rules. This automation is the source of the fund’s near-zero cost — there is no army of analysts to pay, no expensive trading activity, no marketing campaigns about which stocks to buy.

The total stock market index fund is similar in spirit but broader. Funds like Vanguard’s VTI or Schwab’s SCHB hold not just the 500 largest companies but roughly 3,500 to 4,000 publicly traded U.S. companies of all sizes. The difference between an S&P 500 fund and a total stock market fund is small for most investors; both have produced very similar long-term returns.

Why index funds beat active management

The math is uncomfortable for the active management industry but undeniable. There are several reasons index funds win in the long run.

Fees compound against active funds. The average actively managed U.S. equity fund charges between 0.50 and 1.00 percent in annual expense ratio. The largest index funds charge 0.03 to 0.05 percent. That difference of 0.5 to 1.0 percent per year compounds against the active fund every single year. Over 30 years, the cumulative drag from fees alone amounts to 15-30 percent of the final portfolio value. The active fund manager has to overcome that handicap before he is even tied with the index, and most cannot.

Active managers cannot all win. The collective performance of all active managers, by mathematical necessity, must equal the market average (before fees). For one active manager to beat the market by 2 percent, another must lose by 2 percent. After subtracting fees, the average active manager mathematically must underperform the index. This is not opinion; it is arithmetic, first formally described by Nobel laureate William Sharpe in his 1991 paper “The Arithmetic of Active Management.”

Picking the few winners in advance is essentially impossible. Even if some active managers consistently beat the index — and a small handful do — identifying them in advance is the harder problem. Past performance is famously poor at predicting future performance in active management. The funds that did best last decade are not the funds doing best this decade, with surprising regularity.

Behavior in active management adds friction. Active funds trade more frequently than index funds, generating short-term capital gains taxes and transaction costs. In a taxable account, these “tax drags” further reduce the after-tax return below the headline performance numbers.

The specific funds to buy

For an immigrant investor with a long-term horizon, the choice of which index fund to buy is much less important than the choice to buy one at all. That said, here are the specific funds that combine the broadest exposure with the lowest fees, all of which are widely available at Schwab, Fidelity, Interactive Brokers, and other major U.S. brokers.

VTI — Vanguard Total Stock Market ETF. Expense ratio 0.03 percent. Holds approximately 3,800 U.S. stocks across all sizes. The closest thing available to “owning the entire U.S. stock market” in a single ticker. Highly recommended.

VOO — Vanguard S&P 500 ETF. Expense ratio 0.03 percent. Holds the 500 largest U.S. companies. Functionally similar to VTI for most purposes; about 85 percent of VTI’s value is the same 500 large companies that VOO holds.

SCHB — Schwab U.S. Broad Market ETF. Expense ratio 0.03 percent. Schwab’s competitor to VTI. Excellent choice for investors using Schwab as their broker. Performance essentially identical to VTI over any long period.

ITOT — iShares Core S&P Total U.S. Stock Market ETF. Expense ratio 0.03 percent. BlackRock’s version. Another solid alternative with essentially identical long-term performance.

FZROX — Fidelity ZERO Total Market Index Fund. Expense ratio 0.00 percent. Available only at Fidelity. The only fund in the U.S. with a true zero expense ratio. Excellent choice for Fidelity customers. Slightly less tradable than ETFs (it is a mutual fund, not an ETF), which matters only if you frequently move between brokers.

The performance differences between these five funds over any ten-year period are statistically negligible. Pick whichever is available at your broker and easiest to purchase. The decision to use any of them is the decision that matters; the decision of which specific one is almost irrelevant.

How Warren Buffett, John Bogle, and others recommend this for their families

The argument for index investing is not new and is not controversial among financial professionals who have studied the data. The most prominent voices recommending index funds to their own families include some of the wealthiest and most respected investors of the past century.

Warren Buffett, often considered the greatest active investor of all time, has stated multiple times in shareholder letters and interviews that the bulk of his estate will be invested in a low-cost S&P 500 index fund for his wife’s benefit after his death. In his 2013 letter to Berkshire Hathaway shareholders, he wrote that he had instructed the trustee of his wife’s bequest to put 90 percent of the cash in “a very low-cost S&P 500 index fund” and 10 percent in short-term government bonds. The full text is publicly available on the Berkshire Hathaway investor website.

John Bogle, the founder of Vanguard and the inventor of the first retail index fund in 1976, dedicated his career to making index funds available to ordinary investors. His book The Little Book of Common Sense Investing is a 250-page argument for the simple proposition that ordinary investors should own broad index funds at low cost, hold them through market cycles, and ignore the noise.

David Swensen, the late chief investment officer of Yale University’s endowment and one of the most sophisticated institutional investors of his generation, wrote in his book Unconventional Success that individual investors should use index funds rather than try to replicate the complex strategies that institutional investors deploy.

This is not a fringe argument or a contrarian theory. It is the standard professional advice for individual investors, given freely by people who built their entire careers on understanding markets.

The small cases where active management might make sense

To be fair, there are a few situations where active management or alternative strategies can produce better outcomes than index investing. Most of them do not apply to typical individual investors, but they are worth knowing for completeness.

In small and inefficient markets — for example, micro-cap emerging-market stocks — active managers occasionally find genuine opportunities that an index would miss. For most U.S. investors, this is irrelevant, since the U.S. large-cap market is among the most efficient and most studied in the world.

In sophisticated tax-management strategies — particularly for investors with very high net worth or unusual income structures — active management combined with tax-loss harvesting and direct indexing can sometimes generate after-tax outperformance. These strategies require portfolios of typically $250,000 or more and meaningful complexity to be worth pursuing.

For investors with strong moral or religious requirements — for example, exclusions of certain industries — active management or specialized index funds may be necessary to align with values. Vanguard, BlackRock, and others offer ESG (environmental, social, governance) funds that screen for these criteria, though they tend to have slightly higher expense ratios than vanilla index funds.

For everyday immigrant investors building wealth through monthly contributions to a brokerage and a Roth IRA, none of these special cases apply. The plain index fund strategy is the right answer.

Building a complete portfolio around an index fund

One index fund is enough to start. Over time, most investors evolve toward a slightly more diversified structure. The classic “three-fund portfolio,” popularized by John Bogle’s followers, allocates across three asset classes:

U.S. stock market index fund (VTI, SCHB, FZROX, or VOO) — typically 60 to 80 percent of the portfolio for younger investors.

International stock market index fund — typically 15 to 30 percent. Funds like VXUS (Vanguard Total International Stock ETF, expense ratio 0.07 percent) or IXUS (iShares Core MSCI Total International, expense ratio 0.07 percent) cover developed and emerging markets outside the U.S.

Bond index fund — typically 5 to 30 percent depending on age and risk tolerance. Funds like BND (Vanguard Total Bond Market ETF, expense ratio 0.03 percent) or AGG (iShares Core U.S. Aggregate Bond ETF) provide stability and income.

A common allocation for an immigrant investor in their 30s or 40s with a 25+ year horizon: 75 percent VTI, 15 percent VXUS, 10 percent BND. The expense ratio of this combined portfolio is approximately 0.04 percent — meaning a $100,000 portfolio costs about $40 per year in fund fees, total. For comparison, a typical financial advisor on the same portfolio would charge $1,000 to $1,500 per year for advice that, statistically, would not outperform this simple allocation.

For investors who want even more simplicity, target-date funds (such as Vanguard’s Target Retirement series or Fidelity’s Freedom Funds) bundle these three asset classes into a single fund that automatically adjusts the allocation over time. These funds work especially well inside retirement accounts. Their expense ratios are slightly higher than the three-fund DIY approach but the convenience is meaningful for many investors.

The behavior side of index investing

The technical case for index funds is well-established. The harder challenge is behavioral: actually holding the fund for the decades required to capture the long-term return. Most investors who switch to index funds at some point lose patience during a market downturn and sell, defeating the entire purpose.

The historical pattern of the S&P 500 is one of relentless growth interrupted by occasional sharp declines. Since 1928, the index has produced positive returns in roughly 75 percent of calendar years. The remaining 25 percent of years include declines that have been as steep as 38 percent in a single year (1937) and 37 percent (2008). These are real, painful drops that test every investor who experiences them.

The discipline that distinguishes successful long-term investors is the ability to continue making automatic monthly contributions through the bad years, not despite the declines but because of them. Buying at lower prices accelerates eventual returns when the recovery comes. Selling during declines locks in the loss and forfeits the recovery.

Practical tools that help with this discipline: setting up fully automatic monthly contributions, deleting the brokerage app from the phone during particularly volatile periods, ignoring financial news, and re-reading Buffett’s letters or a chapter from Bogle’s book during moments of doubt. The mechanical infrastructure protects against emotional decisions in real time.

How much should be in this single fund

For investors with very long time horizons (more than 25 years) and high tolerance for volatility, having 80 to 100 percent of stock investments in a single broad-market index fund is reasonable. For investors with shorter horizons or lower volatility tolerance, the allocation to stocks should be smaller, with the remainder in bonds and cash equivalents.

A common rule of thumb is “your age in bonds” — meaning a 30-year-old holds roughly 30 percent in bonds and 70 percent in stocks, a 40-year-old holds 40 percent in bonds, and so on. This rule has fallen somewhat out of favor as life expectancies have lengthened; more recent guidance suggests “your age minus 20 in bonds” for healthier, longer-living investors.

The exact ratio matters less than consistency. Picking an allocation, sticking to it, and rebalancing once a year produces results that are essentially indistinguishable from more complex strategies. Simplicity is itself a feature.

What index funds did during the worst markets of the last 50 years

The honest case for index funds includes the honest history. Long-term returns are excellent, but the path to those returns has included some genuinely painful periods. Understanding what actually happened during those periods helps prepare investors emotionally for what will inevitably happen again.

1973-1974 bear market. The S&P 500 fell roughly 48 percent over two years, driven by the OPEC oil embargo, stagflation, and the Vietnam War’s economic toll. An investor who held through the bottom and continued contributing recovered the lost value by 1976 and was significantly ahead by 1980.

1987 Black Monday. The S&P 500 dropped 22.6 percent in a single day on October 19, 1987 — the largest one-day decline in modern market history. The headlines warned of a new Great Depression. The market recovered the entire loss within two years, and a buy-and-hold investor from January 1987 still ended the year with a positive total return because of the strong first nine months.

2000-2002 dot-com crash. The S&P 500 fell about 49 percent over three years as the technology bubble collapsed. Index investors saw their balances cut roughly in half. Those who continued automatic contributions through the bottom recovered fully by 2007 and benefitted enormously from the lower prices at which they accumulated shares.

2008 financial crisis. The S&P 500 fell about 37 percent during the calendar year, with a peak-to-trough decline closer to 57 percent measured from October 2007 to March 2009. Index investors who held and kept contributing through the worst months saw their portfolios recover by 2013 and roughly triple by 2020.

2020 COVID crash. The S&P 500 fell 34 percent in five weeks during February and March 2020 as the pandemic shut down the global economy. The recovery was unusually fast — full recovery by August 2020 — but during the crash, no investor knew the recovery would arrive that quickly. Those who panicked and sold in March missed one of the strongest one-year rallies in history.

2022 bear market. The S&P 500 fell about 19 percent during a year of high inflation and rising interest rates. Recovery was choppy through 2023 and 2024.

The common thread across all six episodes: index investors who held and continued contributing came out ahead. Those who tried to time their entries and exits almost universally underperformed. The discipline of doing nothing during downturns is, paradoxically, the most active part of long-term index investing.

How index funds compare to popular alternatives

Investors evaluating index funds inevitably compare them to alternatives they hear about. A few honest head-to-head comparisons are worth making.

Index funds versus high-fee mutual funds. The cumulative impact of fees is enormous. A 0.50 percent annual fee difference, on a portfolio that compounds to $500,000 over 30 years, reduces the final balance by approximately $80,000. The active fund has to beat the index by more than its fee just to break even. Most do not.

Index funds versus dividend-focused funds. Dividend funds (such as VYM or SCHD) have a loyal following because the payments feel tangible. However, total return (price appreciation plus dividends) of broad market index funds has historically matched or exceeded dividend-focused funds over long periods. The dividend strategy has psychological appeal but limited mathematical advantage for accumulation-phase investors.

Index funds versus cryptocurrency. Crypto has produced both spectacular gains and spectacular losses, with very wide ranges of outcomes. Index funds produce more modest but vastly more reliable returns. For wealth-building purposes, index funds are appropriate as the core of a portfolio; crypto, if held at all, fits as a small (under 5 percent) speculative position.

Index funds versus real estate. Real estate has produced solid long-term returns, particularly with leverage from mortgages. The total return of broad U.S. stock index funds has actually slightly exceeded the total return of residential real estate over the last 30 years, but with very different risk and effort profiles. For passive accumulation, index funds win on simplicity. Real estate has tax advantages and forced-savings benefits that suit certain investors.

Frequently asked questions

Is VTI better than VOO?

Functionally, they are nearly identical for long-term investors. VTI holds the entire U.S. market (about 3,800 stocks). VOO holds the S&P 500 (about 500 stocks). Because the 500 largest companies make up about 85 percent of total U.S. market value, the performance of the two funds tracks very closely. Either is a good choice. Most investors pick one and stop thinking about it.

Can I buy index funds with an ITIN?

Yes. Index funds are bought and sold within a brokerage account just like any other stock or ETF. ITIN holders who have brokerage accounts at Schwab, Fidelity, Interactive Brokers, Webull, or other ITIN-accepting brokers can buy index funds the same way as SSN holders.

How often should I rebalance my index fund portfolio?

For most investors, once a year is sufficient. Some prefer to rebalance when any allocation drifts more than 5 percent from its target. Frequent rebalancing — monthly or quarterly — adds transaction costs and tax friction with little benefit. Annual rebalancing on a fixed date (such as your birthday or January 1) is simple to remember.

Should I buy index funds inside a Roth IRA or a taxable account first?

If your income is below the Roth IRA contribution limits and you have earned income, the Roth IRA should generally come first. The tax-free growth and tax-free withdrawals make it the most efficient location for long-term index fund holdings. A taxable brokerage account is useful once the tax-advantaged accounts are maxed out or for goals before retirement.

What if the index fund I buy “crashes” — am I going to lose everything?

An S&P 500 or total U.S. market index fund holds shares in 500 to 4,000 of the largest companies in the U.S. economy. For the fund to “go to zero,” essentially every major U.S. company would have to fail simultaneously — an outcome that has never happened and would represent something closer to civilizational collapse than a market event. Individual companies fail. Broad indexes have historically always recovered. The risk is volatility along the way, not permanent loss.

Conclusion: the single most useful piece of investing knowledge

If you took only one idea from a year of reading financial articles, this should be it: buy a low-cost broad-market index fund, hold it for decades, and ignore everything else. This single piece of knowledge, applied consistently, beats roughly 90 percent of professional investors over long periods. It costs almost nothing. It requires almost no time. And it is available to any immigrant with a brokerage account and the discipline to leave it alone.

The reason this advice does not feel exciting is because it is not designed to be exciting. Wealth building, at the individual level, is supposed to be boring. The excitement comes from compounding silently in the background while you live your life. The investors who try to make investing exciting almost always pay for that excitement with worse returns. The investors who accept the boring path almost always finish ahead.

Open the brokerage app this week. Buy a single share of VTI, SCHB, VOO, ITOT, or FZROX. Set up an automatic monthly purchase of the same fund. Then close the app and live your life. Thirty years from now, the boring decision you made today will look like the best financial choice of your adult life.

For more on building a complete portfolio, see our guide to the three-fund portfolio for immigrants. For specifics on opening a brokerage account with an ITIN, see our broker comparison and individual broker reviews.

“I checked every quarter for the first two years. Then I stopped. Four years later I looked again and had to re-read the number three times. Doing nothing was the best decision I ever made.”
— Amara O., Ghana → Atlanta — invested 2019