VFIAX vs VTSAX: Which Vanguard Fund Is Right for You? (2026)
VFIAX and VTSAX are two of Vanguard's most popular mutual funds. Both are cheap index funds and excellent long-term investments — but they track different things. This breakdown covers every meaningful difference so you can make the right call for your portfolio.
VFIAX vs VTSAX: At a Glance
| Metric | VFIAX | VTSAX |
|---|---|---|
| Index Tracked | S&P 500 | CRSP U.S. Total Market Index |
| Number of Holdings | ~500 | ~3,700 |
| Expense Ratio | 0.04% | 0.04% |
| Minimum Investment | $3,000 | $3,000 |
| AUM | ~$519B | ~$1.4T |
| 1-Year Return | ~28.14% | ~27.01% |
| 5-Year Annualized | ~15.76% | ~15.77% |
| 10-Year Annualized | ~13.76% | ~13.72% |
| ETF Equivalent | VOO (0.03%) | VTI (0.03%) |
Returns are approximate. Past performance does not guarantee future results.
What's the Actual Difference?
VFIAX tracks the S&P 500 — a market-cap-weighted index of the 500 largest publicly traded U.S. companies.
VTSAX tracks the CRSP U.S. Total Market Index — essentially every investable publicly traded U.S. stock, across all market caps. That includes the same ~500 large-cap companies in the S&P 500, plus mid-cap, small-cap, and micro-cap stocks.
The practical result: VTSAX owns ~3,700 stocks. VFIAX owns ~500. But because both funds are market-cap weighted, the additional ~3,200 stocks in VTSAX represent only about 10–15% of the fund's total value.
Historical Performance Comparison
| Period | VFIAX | VTSAX | Difference |
|---|---|---|---|
| 1-Year | 28.14% | 27.01% | VFIAX +1.13% |
| 3-Year (Ann.) | 9.52% | 9.38% | VFIAX +0.14% |
| 5-Year (Ann.) | 15.76% | 15.77% | ~Tied |
| 10-Year (Ann.) | 13.76% | 13.72% | VFIAX +0.04% |
Takeaway: Performance is nearly identical over most periods. VFIAX has a slight recent edge because large-cap tech has dominated. When small- and mid-cap stocks outperform, VTSAX tends to pull ahead.
VFIAX vs VTSAX: Which Should You Choose?
Choose VFIAX if you…
- ✅ Believe large-cap U.S. companies will continue to drive market returns
- ✅ Want exposure only to established, profitable companies
- ✅ Hold international funds separately and want a clean large-cap U.S. core
- ✅ Are benchmarking against the S&P 500
Choose VTSAX if you…
- ✅ Believe in broad market diversification, including small and mid caps
- ✅ Want maximum U.S. market exposure in a single fund
- ✅ Follow a three-fund portfolio strategy (VTSAX + VXUS + BND)
- ✅ Want exposure to smaller companies that may outperform over very long periods
The Jack Bogle take: Bogle himself preferred the S&P 500 as a proxy for the total market. The academic argument for VTSAX is "true total market exposure." Both views are defensible.
The pragmatic take: If you already own one of these, don't switch. If you're starting fresh, VTSAX is the more complete market representation.
Frequently Asked Questions
Is VFIAX or VTSAX better for a Roth IRA?
Both are excellent for a Roth IRA. VTSAX gives you broader market exposure. Either is a strong core holding. If you have no other U.S. equity exposure, VTSAX gives you the full market.
Do VFIAX and VTSAX overlap?
Significantly — roughly 85–90% of VTSAX's value comes from the same companies in VFIAX. The additional ~3,200 stocks in VTSAX make up only the remaining 10–15%.
Which is riskier: VFIAX or VTSAX?
VTSAX carries slightly more risk due to its small- and mid-cap exposure. In practice, the difference is marginal — both funds move almost identically in bull and bear markets.
Should I hold both VFIAX and VTSAX?
No. Holding both is redundant — VTSAX already contains everything in VFIAX, plus more. Pick one and put your full U.S. equity allocation there.
What is the ETF alternative to VFIAX and VTSAX?
VOO (Vanguard S&P 500 ETF, 0.03% ER) is the ETF equivalent of VFIAX. VTI (Vanguard Total Stock Market ETF, 0.03% ER) is the ETF equivalent of VTSAX. Both ETFs are slightly cheaper and available with no minimum investment.
Get New Comparisons in Your Inbox
New fund comparisons, data updates, and investing guides — delivered free. No spam.
Keep Comparing
Data current as of March 2026. Returns are approximate based on historical data. Past performance does not guarantee future results. This article is for informational purposes only and does not constitute investment advice.