A one-point fee gap costs $161,434 in this model
Two investors each start with $10,000 and add $500 at each month-end for 30 years. Assume both funds earn 8% gross every year solely to isolate costs. A 0.05% annual fee leaves a modeled $845,399; a 1.05% fee leaves $683,965. The $161,434 gap is a fee illustration, not a forecast or a quote for two actual funds. Market returns move unevenly, and either fund can lose money.
| Same gross-return illustration | Low-fee fund | Higher-fee fund |
|---|---|---|
| Starting balance | $10,000 | $10,000 |
| Monthly deposit | $500 | $500 |
| Gross annual assumption | 8.00% | 8.00% |
| Annual fee assumption | 0.05% | 1.05% |
| Modeled balance after 360 deposits | $845,399 | $683,965 |
The calculation uses a net annual rate of 7.95% or 6.95%, divided by 12 for monthly growth, with deposits made after each month of growth. A prospectus may deduct fees differently; real returns are not smooth.
Same 8% gross assumption, different annual fees
What the latest SPIVA figure actually measures
S&P Dow Jones Indices reports that 79% of active large-cap U.S. equity funds underperformed the S&P 500 in calendar 2025, compared with 65% in 2024. The older chart on this page displayed 60% for a one-year period without identifying a year or linking the scorecard. That was not a valid current statistic. A Kennesaw State University analysis reproduces S&P's annual SPIVA figures in its Table 2 and identifies the underlying scorecard.
US active large-cap funds trailing the S&P 500
The statistic compares a specified fund category with its benchmark over a specified interval. It does not say that every active fund loses, that every index fund tracks the S&P 500, or that 79% will lose next year. Investors who select a bond, small-cap or international fund need its own suitable benchmark.
The denominator also matters. SPIVA's 79% refers to funds, not 79% of invested dollars. A few large active funds might hold a disproportionate share of assets. The result includes the scorecard's fund and benchmark definitions; a reader should not paste it onto an international or bond-fund comparison. Read the dated report. An undated chart may combine one-, five- and 15-year percentages from different scorecards.
At equal gross returns, the one-point fee gap is easy to isolate. If the higher-fee fund really earned 9% gross while the lower-fee fund earned 8% gross every year, both would have the same 7.95% net rate in this simplified model. The higher-fee manager has to deliver that extra gross point merely to break even on the fee. That is a hurdle, not a claim that a manager can or cannot achieve it.
The gap grows over time because each year's fee lowers the amount available to compound later. Under the article's exact $10,000 starting balance and $500 month-end deposits, the low-fee and higher-fee paths are about $113,305 versus $106,302 after ten years, a $7,003 gap. At 20 years the figures are $341,468 versus $298,876, a $42,592 gap. At 30 years the difference reaches $161,434. The calculation assumes constant returns for comparison; real markets do not deliver them in a straight line.
Read the fund before choosing a style
An index fund follows a stated index and usually seeks to stay close to it. An active fund lets a manager choose holdings. Both can have expenses, taxes, trading costs, concentration and tracking differences. Some active funds charge little; some index products are expensive. The actual share class and account matter more than the label.
Compare the benchmark, expense ratio, turnover and what the fund holds. A 0.05% U.S. large-cap index fund and a 1.05% global active fund do not hold the same assets, so their realized returns cannot be attributed to fees alone. The table above holds gross return equal only to show the mechanism. The SEC's fee guide explains where the charges appear.
Your choice also depends on when you will need the money. Broad diversification can reduce exposure to one company but cannot eliminate market loss. For a short-term bill, a stock fund of either style is a poor substitute for accessible cash. For a long horizon, document the allocation you can keep through a downturn, then check its total cost once a year.
Avoid a misleading comparison between a U.S. large-cap index fund and an active fund that owns emerging-market bonds. Their return difference mostly reflects different risks, not management skill. Start with the same asset class, comparable exposure and an appropriate benchmark. Check whether the quoted fee is the share class you can actually buy and whether advisory fees sit outside the fund. Also consider the account: turnover may create taxable distributions in a brokerage account while the same fund inside a tax-sheltered account has different current-tax consequences.
The decision is also reversible in a way that a past performance record is not. If a fund changes fees, strategy or manager, review it against the original reason you selected it. If an index provider changes index rules, the holdings may shift without a human manager's discretion. Compare the actual product documents at the time of purchase. The 2025 SPIVA result is evidence about a past category, and the fee model is arithmetic about a chosen assumption; neither is a substitute for that product-level check.
The simplest question to ask a salesperson is which benchmark the fund intends to beat after fees and over what period. Write down the answer and the share-class identifier. If the fund has no comparable benchmark or its fee information is unclear, you do not have enough information to attribute an advertised return to skill.
