CALCULATOR · MONEY · INVESTING COMPARISON
The stock-picker’s dream meets compound arithmetic. At the defaults, $10,000 over 20 years in an index fund netting 9.97% ends at $66,908.99, while a stock portfolio netting 8.50% ends at $51,120.46 — a $15,788.53 gap from just 1.47 points of annual drag. Enter your own numbers and see which side your assumptions favor.
Both sides start with the same lump sum and compound annually. Net return = gross return minus fee (index) or drag (stocks). Drag bundles everything that eats a stock picker’s return: trading costs, taxes on turnover, cash sitting idle, and mistimed buys and sells.
$15,788.53 is the price of 1.47 points of annual drag over 20 years — and the index side’s fee is just 0.03%. The 60-second rule: whoever keeps more of the gross return wins, and the index fund keeps nearly all of it. A stock picker doesn’t need to be bad to lose — they need to be better than the market by more than their drag, every year, for decades.
Setup: $10,000, 20 years, index gross 10.00% minus fee 0.03%, stock gross 10.00% minus drag 1.50%.
Line 1 — the net returns. Index net = 10.00 − 0.03 = 9.97%. Stock net = 10.00 − 1.50 = 8.50%.
Line 2 — the index end value. $10,000 × 1.099720 = $66,908.99.
Line 3 — the stock end value. $10,000 × 1.08520 = $51,120.46.
Line 4 — the gap. $66,908.99 − $51,120.46 = $15,788.53 to the index fund. Same starting money, same gross market return — the entire gap is cost.
Same nets, ten more years: index $173,071.98 vs stocks $115,582.52 — a $57,489.46 gap. Time doesn’t forgive drag, it compounds it. A 1.47-point annual leak costs $15,789 over 20 years and $57,489 over 30. This is why the decision matters most when you’re young: the longer the horizon, the more the low-cost side pulls away.
Give the picker real skill — a 11.50% net return against the index’s 9.97% over 20 years — and stocks end at $88,205.84 vs the index’s $66,908.99: stocks win by $21,296.85. The catch is what 11.50% net demands: beating the market by 1.53 points a year, after all costs, for twenty straight years. Possible for a few — and the SPIVA evidence below says 92.9% of actively managed U.S. large-cap funds failed to clear that bar over 20 years.
One holding at 20% weight halves in year 1. That single blowup costs the whole portfolio 10% (0.20 × 0.50), so the stock end value falls to $46,008.42 against the index’s $66,908.99 — a $20,900.58 gap. Index funds hold hundreds of stocks, so one company’s disaster is a rounding error. A concentrated portfolio has no such cushion: your best idea can also be your worst day.
Strip out everything except a modest cost edge — stock net 9.50% vs index net 9.97% over 20 years — and stocks end at $61,416.12 vs $66,908.99: the index wins by $5,492.87. Less than half a point a year, with no blowups and no bad timing, still costs thousands. Costs are the only part of investing you control completely.
If you love picking stocks but respect the evidence, split the difference: keep at least 90% in index funds and pick stocks with at most 10%. At the defaults, a 90/10 blend ends at $65,330.14 — just $1,578.85 behind the pure index fund, because only a tenth of the money suffers the drag. And if your picks genuinely win at 11.50% net, the blend ends at $69,038.67, beating the pure index by $2,129.68. The satellite gives you the fun and the upside; the core makes sure a bad decade of picks can’t wreck the retirement. That asymmetry — capped downside, open upside — is the whole point of the split.
S&P Dow Jones Indices’ SPIVA scorecards, which compare active funds against their benchmarks, keep telling the same story. The year-end 2025 scorecard reports that 92.9% of actively managed U.S. large-cap funds trailed the S&P 500 over 20 years, about 89.5% over 15 years, 85.6% over 10 years — and 79% trailed in 2025 alone. The longer the horizon, the worse the professionals’ record gets, which is exactly what compounding costs predict. A second line of evidence points the same way: a study of every U.S. stock from 1926 to 2016 found that just about 4% of listed companies created all of the stock market’s net wealth above Treasury bills — most individual stocks, over their full lifetimes, failed to beat even a risk-free return. Picking winners means finding those few needles, in advance, and holding them. An individual picking stocks part-time faces the same arithmetic with less information. That doesn’t make stock picking foolish — it makes the burden of proof high. If you pick stocks, do it with money you can afford to underperform with, and keep the core of the portfolio indexed.
| Side | Gross 20-yr value | Net 20-yr value | Cost of the leak |
|---|---|---|---|
| Index fund (0.03% fee) | $67,275.00 | $66,908.99 | $366.01 |
| Stock portfolio (1.50% drag) | $67,275.00 | $51,120.46 | $16,154.54 |
| Fee-drag-only stocks (0.50% drag) | $67,275.00 | $61,416.12 | $5,858.88 |
Both sides start from the same $67,275.00 gross value ($10,000 at 10% for 20 years). The index fee eats $366; the stock drag eats $16,155 — 44 times more.
| Output | Formula | What it means |
|---|---|---|
| Index end value | P × (1 + netindex)years | $66,908.99 at the defaults — the lump sum after index fees. |
| Stock end value | P × (1 + netstocks)years | $51,120.46 at the defaults — the lump sum after all stock drag. |
| Dollar gap | |index − stocks| | $15,788.53 — what the return difference is actually worth in cash. |
| Net returns | gross − fee (or drag) | 9.97% vs 8.50% — the only two numbers that decide the winner. |
| 30-year gap | same nets, 30 years | $57,489.46 — time magnifies a small edge into a large fortune gap. |
| Blowup value | stock value × (1 − weight × fall) | $46,008.42 — one 20% holding halving costs the portfolio 10%. |
The math is exact for a single lump sum compounding annually at a fixed net rate — it does not model contributions, withdrawals, market volatility, or sequence risk. Real returns bounce year to year; a smooth 10% is an illustration, not a forecast. Taxes are folded into the drag estimate, not computed — your bracket and account type change the real number. The SPIVA framing is a summary of published scorecard findings, not a precise figure for any single year. Not financial advice. Error policy: an amount at or below $0, years outside 1–50, any rate outside −20% to 30%, or a fee/drag at or above its gross return is reported as an error — a net return at or below zero has no compounding to model, so the calculator refuses rather than inventing a number.
Bright Side Kit. "Index Funds vs Individual Stocks: 20-Year Calculator." https://brightoolbox.com/index-funds-vs-individual-stocks/ Accessed October 24, 2026.Data sourcesYes — but the bar is higher than most people think. At the defaults, a picker needs a net return above 9.97% every year for 20 years just to tie. Branch B shows a picker netting 11.50% wins by $21,296.85. The SPIVA year-end 2025 scorecard says 92.9% of actively managed U.S. large-cap funds failed to clear that bar over 20 years (85.6% over 10 years, 79% in 2025 alone) — so treat beating the index as a claim that needs your own audited track record, not a feeling.
Everything between the market’s return and your pocket. Commissions and bid-ask spreads, taxes triggered when you sell winners, dividends taxed along the way, cash sitting idle between ideas, and mistimed entries and exits — buying after good news, selling after bad. The default 1.50% bundles all of it; heavy traders often leak more.
Because an index fund does almost nothing. It buys the whole market in fixed proportions and rarely trades, so there are no analysts, no star managers, and almost no tax-triggering turnover to pay for. The cheapest broad-market funds charge 0.03% or less — $3 a year per $10,000 invested.
No — it means pick stocks with the right money. Keep the core of the portfolio — the retirement money, the money you cannot afford to lose — in low-cost index funds, and pick stocks with a separate slice you can afford to underperform with. That way a blowup like Branch C costs a hobby, not a retirement.
An index fund holds hundreds of companies, so one bankruptcy barely registers. A 10-stock portfolio holds 10 single points of failure: one fraud, one failed drug trial, one bad quarter can halve a position, and Branch C shows that costs the whole portfolio 10%. Diversification isn’t about owning many stocks — it’s about making sure no single one can hurt you.
More than the return usually pays for. Reading filings, tracking earnings, and resisting panic-selling is a part-time job — and the time has a price. If you spend five hours a week for 20 years to end up $15,789 behind the index, you paid for the privilege of working. An index fund takes about fifteen minutes a year.
Lower the gross return and re-run it. At a 6% gross return, the index nets 5.97% and stocks net 4.50%; over 20 years $10,000 becomes $31,890.31 vs $24,117.14 — a smaller gap in dollars, but the same verdict. Costs matter in every market; they just matter most when returns are thin.
Because a net return at or below zero has no compounding to model. If your costs eat the entire gross return, the honest answer isn’t a number — it’s that the strategy loses money before it starts. The calculator says so plainly instead of printing a misleading figure.