VTI vs VOO: Which Should You Pick?
VTI or VOO? Total U.S. market vs the S&P 500, compared on holdings, overlap, cost, and the decision that actually matters. A quick, evidence-based answer.
VTI holds the entire U.S. stock market; VOO holds the S&P 500. They overlap almost completely, cost the same, and have moved together about 99% of the time. For most investors this is a coin flip dressed up as a decision. Here is the quick version, with the one distinction that actually matters.
Quick answer
Pick VTI if you want a single fund that owns the whole U.S. market, including mid- and small-cap stocks. Pick VOO if you specifically want the S&P 500, or if you already hold it in a taxable account and a sale would trigger gains. Do not hold both: VTI already contains every VOO holding, so owning both just adds a rounding error of large-cap weight. The expense ratio is identical, so cost is not the tiebreaker.
| VTI | VOO | |
|---|---|---|
| Benchmark | CRSP US Total Market Index | S&P 500 Index |
| Holdings | ~3,512 | ~504 |
| Market coverage | ~100% of investable U.S. market | Largest ~85% by market cap |
| Expense ratio | 0.03% | 0.03% |
| Includes mid / small-cap | Yes | No |
| Overlap | Contains all VOO holdings | ~87% of VTI by weight |
| Selection | Rules-based, quarterly | Committee, profitability screen |
| Correlation | 0.99 across all periods | |
| Tax treatment | Identical: both are ETFs with the same qualified-dividend and capital-gains treatment | |
Vanguard fund documents (December 2025) and ETF Research Center. Correlation measured over 1-, 3-, 5-, and 10-year windows.
The one real difference
VTI adds the roughly 15% of the U.S. market that VOO leaves out: mid- and small-cap stocks. Over long periods that exposure has produced small and inconsistent return differences, sometimes favoring VTI, sometimes VOO, because large caps dominate both funds by weight. VTI is the more complete answer to “own the U.S. market.” VOO is a clean, defensible large-cap core. Neither is a mistake.
Does the choice even move your outcome?
Before agonizing over it, size the decision. This calculator shows how much a small annual difference actually changes your ending wealth, so you can see whether VTI versus VOO belongs anywhere near the top of your to-do list.
Does This Decision Even Matter?
$120.9K
impact over 25 years from 44bp annual gap
$175.5K
impact over 25 years
Saving $200/month more matters 1x more than the fund choice.
Other decisions that typically matter more: international allocation, tax-advantaged account usage, behavior during downturns.
Focus on the decisions that matter. Track your FI progress at Summitward's dashboard.
Who should pick which
Lean VTI if you
- Want one fund for all of U.S. equity beta.
- Value owning mid- and small-cap stocks too.
- Are starting fresh with no embedded gains.
Lean VOO if you
- Specifically want the S&P 500.
- Already hold it with gains you do not want to realize.
- Prefer the most widely benchmarked large-cap index.
The full reasoning
This page is the quick decision. For the deeper case, including why VTI is the more principled choice, why VOO is perfectly fine, and the decisions that actually move your net worth more than this one, read VTI vs. VOO: The Most Overrated Decision in Investing.
Want to see how this fits your whole portfolio?
Summitward turns portfolio, tax, and life-planning tradeoffs into decisions you can act on, including overlap, concentration, and tax-location analysis across your accounts.