I want to tell you something that took me longer than I'd like to admit to fully understand.
Two funds can hold identical assets — same stocks, same weightings, same everything — and still post different returns over the same period.
Not because one is smarter. Not because one has better analysts. Because of structure. And structure is the thing nobody explains until you've already made a decision based on incomplete information.
If you've been following along on how the S&P 500 actually works or recently read through the how index ETFs work breakdown, you already know the index itself is just a list — the top 500 US companies by market cap. What you buy when you buy SPY or VOO is access to that list. The question is: which door do you walk through, and does the door itself cost you anything?
What SPY and VOO Actually Are
SPY — the SPDR S&P 500 ETF Trust — launched in January 1993. It was the first ETF ever listed on a US exchange. State Street Global Advisors runs it. It now holds over $500 billion in assets.
VOO — the Vanguard S&P 500 ETF — launched in 2010. Built by Vanguard, the firm John Bogle started on one core belief: costs are the only edge most investors can reliably keep.
Both track the S&P 500. Both are massive. Both have made long-term investors genuinely wealthy.
The difference is not what they own. It's how they're built.
The Fee Gap Is Real — And It Compounds Quietly
VOO charges 0.03% per year in fees.
SPY charges 0.0945% per year.
On paper, that looks like nothing. Three basis points versus nine. Who cares?
On a $100,000 investment held for 30 years at a 10% average annual return — that gap becomes roughly $57,000.
There's a name for this in accounting — silent erosion. It doesn't show up as a loss on your statement. The number doesn't go down. It just grows slower than it should have, year after year, until the gap between what you have and what you could have had becomes too large to ignore. That's what fees do. That's what 0.0945% versus 0.03% looks like at the end of thirty years.
Vanguard's own research has consistently shown that expense ratios are one of the strongest predictors of long-term fund underperformance. Not market timing. Not stock selection. Fees.
So again — if VOO is cheaper, why is SPY outperforming it right now?
The Structural Reason Almost Nobody Mentions
SPY is built as a Unit Investment Trust (UIT).
VOO is built as an open-end mutual fund ETF.
Because SPY is a UIT, it cannot reinvest dividends immediately. When Apple, Microsoft, JPMorgan pay dividends — that cash sits in a non-interest-bearing account until SPY's quarterly distribution date. It's not working. It's not compounding. It's just waiting.
VOO accrues and reinvests dividends almost immediately. That cash goes straight back to work.
In a high-dividend environment, this gives VOO a quiet but real compounding edge.
But we are not in a high-dividend environment right now.
The 2024–2026 bull market has been driven by AI infrastructure and large-cap tech — companies that reinvest earnings rather than pay them out. When dividends are thin on the ground, SPY's dividend drag matters far less. And SPY's other structural advantages start showing up in the numbers.
The Liquidity Premium — This Is What Actually Explains It
SPY trades roughly $30–40 billion in volume every single day.
VOO trades around $1–2 billion.
For you buying 20 shares through your brokerage app, that gap is irrelevant.
For a pension fund moving $200 million — SPY is the only ETF liquid enough to absorb the trade without moving the price against them.
That constant institutional demand keeps SPY's price at — and sometimes slightly above — its net asset value. When an ETF trades at a premium to NAV, early holders benefit in the short term.
This is not a permanent edge. Premiums close. They always do.
But in periods of heavy institutional activity — which the 2025–2026 market cycle has delivered — that premium effect has contributed to SPY posting marginally better returns over certain windows.
The NASDAQ market guide covers how liquidity mechanics affect pricing more broadly if you want to go deeper.
The Options Market Nobody Talks About
SPY is the most actively traded options contract on earth.
Every day, institutions and traders buy and sell SPY options to hedge portfolios, generate income, speculate on direction. Around major expiration dates, the activity gets intense — market makers adjust hedges, large positions unwind, and SPY's price moves in ways that briefly diverge from VOO's.
FINRA tracks how derivatives volume affects underlying securities. The relationship isn't simple causation. But the correlation between SPY's options activity and its short-term price behavior is documented at the institutional level.
VOO has essentially no options ecosystem. Less noise — which is a feature for long-term investors. But in certain conditions, it means VOO misses the pricing dynamics that briefly lift SPY.
The Numbers Side by Side
| Metric | SPY | VOO |
|---|---|---|
| Expense Ratio | 0.0945% | 0.03% |
| Fund Structure | Unit Investment Trust | Open-End Fund |
| Inception Year | 1993 | 2010 |
| Daily Trading Volume | ~$35 billion | ~$1.5 billion |
| Dividend Handling | Held in cash until quarterly payout | Accrued and reinvested promptly |
| Options Market | World's most active | Minimal |
| 10-Year Annualized Return | ~12.8% | ~12.9% |
Look at that last row.
Over a decade, VOO edges out SPY by roughly 0.1% annually. The fee advantage doing its quiet work.
But over the last 12–18 months — with the conditions described above — SPY has posted marginally better numbers. The liquidity premium and reduced dividend drag doing their quiet work.
Which one wins depends entirely on your timeframe.
The Tax Angle That Matters For Taxable Accounts
Vanguard's open-end structure allows for in-kind redemptions — when large investors exit VOO, they swap ETF shares for the underlying stocks directly. This means VOO rarely triggers capital gains distributions for regular shareholders.
SPY, as a UIT, has less flexibility. In years with significant redemptions, it can pass capital gains through to shareholders — and the IRS taxes short-term gains as ordinary income.
If you're investing through a taxable brokerage account, that unexpected tax bill in a good market year is real.
Understanding how to reduce taxes owed to the IRS and how to max tax-advantaged accounts before you even touch a taxable account — that's where the real tax savings live.
Who Should Actually Own SPY
SPY is not a bad fund. It's an extraordinary financial instrument that democratized market access in 1993 in a way that genuinely changed what ordinary people could do with their money.
But it was built for liquidity first. Retail investors being able to buy it is a side effect, not the design goal.
SPY makes sense if you:
- Trade actively and need the tightest spreads available
- Run an options strategy on the S&P 500
- Need to enter or exit large positions without moving the market
VOO makes sense if you:
- Are building wealth over a 10, 20, or 30-year horizon
- Invest consistently every month and don't touch it
- Want to minimize costs and tax drag over time
"The index fund is a most unlikely hero for the typical investor. It asks nothing of you — just patience." — John Bogle, founder of Vanguard
Most people reading this are in the second category. If you're accessing US markets from Nigeria through Bamboo or Risevest and choosing between SPY and VOO as long-term holdings — VOO's lower cost compounds in your favor every year you hold it.
The passive investing case study for beginners shows exactly how that compounding plays out in real numbers.
The Thing That Actually Determines Your Returns
I've watched people spend weeks researching SPY vs VOO, IVV vs SCHB, expense ratios down to the fourth decimal point.
Then they panic sell in March 2020. Or pull out in late 2022 because the headlines got loud. Or never start because they're still researching.
A Federal Reserve study on household wealth found the biggest predictor of wealth accumulation isn't asset selection — it's duration. How long you held. Whether you stayed in when it hurt.
Picking the wrong ETF and staying invested will beat picking the right ETF and leaving at the first sign of trouble. Every time.
If you're working out how much to consistently invest and what the long-term trajectory looks like, how much to invest at 18 to be a millionaire makes the compounding concrete.
The Honest Answer
SPY is outperforming VOO in recent windows because of liquidity mechanics, reduced dividend drag in a growth-led market, and an options ecosystem that creates unusual short-term pricing dynamics.
It is not because SPY is a better long-term investment for most people.
Over any ten-year period with normal market conditions, VOO's fee advantage and dividend reinvestment structure will likely win back the gap — and then some.
My actual position: if I were starting fresh today with a long-term account, I'd buy VOO, automate contributions, and close the app.
SPY is for the institutions. Let them have it.
The real edge in this game has never been the ticker symbol. It's been the willingness to buy when it's uncomfortable, hold when it's terrifying, and add money when every headline says stop.
That's the strategy. Everything else is details.
If you're thinking longer term — what VOO actually does to your net worth over 20 or 30 years — can VOO make you a millionaire runs the math plainly. For anyone weighing whether the stock market is even the right place for this money versus real estate, this comparison is honest about both sides. And before you invest a dollar of it, an investment policy statement is the document that keeps you from making emotional decisions when the market tests you — and it will.
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