S&P 500 funds like VOO and SPY hold roughly 500 of America's largest companies. Total market funds like VTSAX and VTI hold all of that plus thousands more — small and mid-sized businesses included.
Over 10 years, total market returned 15.02% annually. S&P 500 returned 15.16% to 15.23%. That gap is smaller than what your phone bill changes month to month.
So which one wins? Depends entirely on what decade you're asking about.
Before going further, if you're brand new to this whole world of index investing, how do index ETFs work breaks down core concepts in plain language. And if $3,000 minimums on mutual funds are holding you back from VTSAX specifically, can you invest in VTSAX with less than $3,000 covers a workaround.
What's Different Between These Two?
S&P 500 index funds track 500 of America's biggest publicly traded companies — Apple, Microsoft, Nvidia, Amazon, names everyone recognizes.
Total market funds track those same 500 companies, plus roughly 3,100 smaller ones — mid-cap and small-cap businesses you've never heard of, sitting alongside giants in one bundle.
VOO and SPY are S&P 500 funds. VTSAX and VTI are total market funds. Same Vanguard family, different scope.
Long-Term Return Comparison
Over a 10-year stretch, VTSAX returned 15.02% annually. VOO came in slightly ahead at 15.23%, and SPY landed at 15.16%.
That's basically a coin flip. A 0.2 percentage point gap compounds into something noticeable over decades, but it won't change your life on its own.
Stretch back further, though, and story shifts.
"Small-cap stocks outperform large-cap stocks over long periods — that's conventional thinking, and across much of stock market history, it held true." — common framing from index fund research
What 20 Years of Data Shows
From November 2000 to January 2021, VTSAX delivered a 232% total return. S&P 500 returned 189% over that same window.
That's a real gap — over 40 percentage points, compounded across two decades.
Reason: small and mid-cap stocks went through a stretch where they genuinely outpaced large caps, and total market funds captured that ride while S&P 500 funds did not.
Why Recent Years Tell a Different Story
Past several years have flipped that pattern. Large caps — driven by AI-related tech names — have pulled ahead of smaller companies by a wide margin.
That performance gap created drag for total market funds relative to S&P 500, simply because mega-cap tech makes up such a heavy slice of S&P 500 weighting already.
So depending on which window you pick, either fund "wins." Neither answer is wrong — they're just measuring different decades.
VTSAX vs VOO vs SPY: Quick Comparison
| Fund | Companies Held | Expense Ratio | 10-Yr Annual Return | Rating |
|---|---|---|---|---|
| VTSAX | ~3,600 (total market) | 0.04% | ~15.02% | ⭐⭐⭐⭐⭐ |
| VOO | ~500 (S&P 500) | 0.03% | ~15.23% | ⭐⭐⭐⭐⭐ |
| SPY | ~500 (S&P 500) | 0.09% | ~15.16% | ⭐⭐⭐⭐ |
| VTI | ~3,600 (total market) | 0.03% | ~15.02% | ⭐⭐⭐⭐⭐ |
SPY costs more for nearly identical returns to VOO — that 0.09% vs 0.03% gap adds up over decades on a large account. For a deeper dive into that specific comparison, SPY vs VOO: why SPY is outperforming VOO goes into mechanics behind it.
The Tesla Example Everyone Brings Up
VTSAX held Tesla starting from its IPO date in mid-2010. S&P 500 didn't add Tesla until December 2020 — by which point it was already worth roughly $500 billion.
That's a decade of growth total market captured early, and S&P 500 missed entirely.
This is core argument for total market funds: they own tomorrow's giants before committee decides those companies "qualify" for S&P 500 inclusion.
What JL Collins Says About This
JL Collins — author of The Simple Path to Wealth — recommends a near-100% VTSAX portfolio for his daughter and other young investors starting out.
"VTSAX is all you need." — paraphrased core argument from JL Collins, The Simple Path to Wealth
His logic: total market gives broad diversification, low cost, and removes need to ever think about whether large caps or small caps "should" be doing better this decade.
Risk Differences Worth Knowing
S&P 500 funds tend toward slightly less volatility because holdings are established, larger companies with longer track records.
Total market funds carry a touch more bumpiness, since smaller companies swing harder in both directions during market stress.
If watching your balance during a downturn already makes you anxious, that small extra volatility in total market might matter more than 0.2 percentage points of long-term return. For a broader breakdown of how these risks stack up, types of risks in investment with examples covers ground worth knowing before picking either fund.
What If You Already Own VOO or SPY?
Switching from one to other purely to chase a 0.2% return gap usually isn't worth tax consequences in a taxable account.
If you're investing inside a Roth IRA or 401(k), switching costs nothing tax-wise — so feel free to move if total market's broader diversification appeals to you.
If unsure whether index funds in general fit your bigger plan, best stocks for beginners with little money walks through how index funds compare against picking individual companies yourself.
Does Owning Both Make Sense?
Technically, no — VTSAX already contains every company VOO holds, plus thousands more.
Owning both means your S&P 500 holdings get extra weight twice over, which tilts your portfolio toward large caps without adding anything new.
Pick one. Either total market alone, or S&P 500 alone, covers core of a solid long-term portfolio without overlap headaches.
A Simpler Way to Think About This Decision
S&P 500 bets on biggest, most established companies continuing to dominate.
Total market bets on biggest companies plus whatever smaller companies might grow into tomorrow's giants.
Both bets have paid off historically. Difference between them, over a full investing lifetime, tends to be smaller than difference between starting at 22 versus starting at 32. If you're weighing how soon to begin versus which fund to pick, how much to invest at 18 to become a millionaire puts that timing question into real numbers.
"It's not timing market, it's time in market" — common investing wisdom, especially relevant when agonizing over fund choice delays actual investing.
So Which One Wins?
Over any given decade, either could edge out other by a few points depending on whether small caps or mega-cap tech happen to be having their moment.
Over a full investing career — 30, 40 years — gap between total market and S&P 500 tends to shrink toward something close to noise.
What matters more: choosing one, putting money in consistently, and not switching back and forth chasing whichever fund had a better headline last year.
Where This Leaves Beginners
If you're just starting and feel paralyzed between these two options, that paralysis itself costs more than either fund's small return difference ever will.
VTSAX or VTI gives broader diversification and slightly more exposure to smaller companies. VOO gives marginally lower cost and a tighter focus on biggest, most stable names.
Either choice, held consistently for decades, puts you ahead of someone who spent six months "researching" before finally pressing buy. For a sense of what consistent investing compounds into over time, can VOO make you a millionaire runs through real numbers on that exact question.
One More Thing Before You Decide
If $3,000 minimum for VTSAX Admiral Shares feels like a barrier, VTI gives identical total market exposure with zero minimum and a slightly lower expense ratio.
And if you're deciding between Vanguard's platform versus other brokers entirely for holding either fund, that's worth weighing too — fees, interface, and account types differ more between brokers than VOO differs from VTSAX in returns.
For folks thinking about how this fits alongside other money goals — paying down debt, building emergency savings, retirement accounts — how to budget for beginners helps map out where investing fits into bigger financial picture.
These cover ground that connects directly to fund choice and long-term investing decisions:
- Can you invest in VTSAX with less than $3,000?
- How to turn $10,000 into $100,000
- Risks of single stock investing
- Vanguard index fund dividends explained
- Unsystematic risk explained
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