The Compounding Power of Zero-Fee Index Funds: Why 0.02% Costs More Than You Think
The Compounding Power of Zero-Fee Index Funds: Why 0.02% Costs More Than You Think
When Fidelity launched the world's first zero expense ratio index funds in 2018, reactions split cleanly in two. Revolutionary, or marketing gimmick. Seven years later, the numbers have their own answer.
The Gap Between 0.02% and 0%
An expense ratio is the annual fee a fund automatically deducts from your investment. Both Fidelity and Schwab charge 0.02% on their standard index funds. On $100,000, that's $20 per year.
Barely the price of a decent lunch. True — for one year. But investing isn't a one-year game.
Fidelity went further. FZROX (total market), FZILX (international), FNILX (large cap), FZIPX (small cap) — four index funds at 0% expense ratio. A world first. No other provider, Schwab included, has matched it.
What Compounding Does to That "Tiny" Fee
To see why dismissing 0.02% is a mistake, I ran the numbers on total market funds.
Fidelity's FZROX (0% expense ratio) versus Schwab's SWTSX (0.03%) — $100,000 invested over 30 years:
| Period | FZROX (Fidelity, 0%) | SWTSX (Schwab, 0.03%) |
|---|---|---|
| Year 10 | $377,990 | $350,529 |
| Year 20 | $1,382,428 | $1,182,861 |
| Year 30 | $4,968,992 | $3,922,518 |
Difference: $1,046,474. Over one million dollars.
Not all of that gap comes from the expense ratio alone — share price appreciation also diverged (FZROX at 13.43% vs SWTSX at 12.57%). But the 0% expense ratio creates the conditions for compounding to work at full power. Every dollar that would have gone to fees stays invested instead.
How Fees Erode Dividend Reinvestment
Index fund returns come from two sources: price appreciation and reinvested dividends.
A 0% expense ratio means 100% of your dividends get reinvested — no fee deduction before reinvestment. In a single year, the difference is negligible. Over 30 years of compounding, it's not.
FZROX's 30-year reinvested dividend income: $96,390 SWTSX's 30-year reinvested dividend income: $68,597
That's a $28,000 gap in reinvested dividends alone — purely from having more money working for you each cycle.
Fidelity's Business Model: Loss Leader or Innovation?
If the expense ratio is 0%, how does Fidelity make money? Fair question.
The strategy is straightforward. Zero-fee funds attract customers. Revenue comes from advisory services, margin lending, cash management, and the broader ecosystem. Think of it like a streaming platform spending heavily on content to grow subscribers — the entry point is free, but the business model works.
What matters for investors: the product is genuine. FZROX accurately tracks the total US market, and the 0% fee benefit flows directly to the investor. A loss leader with real quality is still a win for the customer.
The Pattern Repeats Across Categories
This structural cost edge isn't limited to total market funds.
In bonds, Fidelity's FXNAX finished $148,090 ahead of Schwab's SWAGX over 30 years. In international markets, FSPSX beat SWISX by $481,937. The magnitude varies by category, but the direction is consistent.
The cheapest option compounds the most. And nothing is cheaper than zero.
My Take on Fees
I'm not arguing every investor must use Fidelity. Schwab's S&P 500 fund (SWPPX) actually beat Fidelity's FXAIX by $116,154 over 30 years. Different platforms have different strengths.
But one thing is certain: fees are the only variable in investing you can fully control. You can't predict market returns. You can't guarantee dividend growth. But you can choose the fund that takes less of your money each year — and let compounding do the rest.
0.02% looks trivial because you're only looking at one year. Look at 30, and you'll see a million dollars.
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