VTSAX vs VTIAX: U.S. vs International — How to Split Your Portfolio (2026)
VTSAX covers the entire U.S. stock market. VTIAX covers everything outside it. Together they give you the whole world. This comparison breaks down returns, risk, diversification benefits, and how much to allocate to each.
By Dan Mahler · Published August 25, 2026
💡 Bottom Line Up Front
These are not competing funds — they complement each other. Most investors should hold both. A 60% VTSAX / 40% VTIAX split roughly matches global market-cap weights and is what Vanguard uses in its own target-date funds. VTSAX has dominated over the past decade, but VTIAX is leading in 2026. Holding both means you don't have to guess which market wins next.
VTSAX vs VTIAX: Quick Comparison
| Metric | VTSAX | VTIAX |
|---|---|---|
| Full Name | Vanguard Total Stock Market Index Admiral | Vanguard Total Int'l Stock Index Admiral |
| Market Coverage | U.S. stocks only | Non-U.S. stocks only |
| Number of Holdings | ~3,640 | ~8,500 |
| Expense Ratio | 0.04% | 0.12% |
| Minimum Investment | $3,000 (both) | |
| 1-Year Return | 16.27% | 22.10% |
| 3-Year Annualized | 22.65% | 21.31% |
| 5-Year Annualized | 12.73% | 9.96% |
| 10-Year Annualized | 14.57% | 9.63% |
| Volatility (Std Dev) | 13.10% | 16.01% |
| Dividend Yield | 1.05% | 2.55% |
| Total Assets | $2.29 trillion | $645.8 billion |
| Index Tracked | CRSP U.S. Total Market | FTSE Global All Cap ex US |
Overview: Two Halves of the Global Market
VTSAX and VTIAX are the two building blocks of a globally diversified stock portfolio. VTSAX gives you exposure to the entire U.S. stock market — large-caps like Apple and Microsoft, mid-caps, and small-caps down to micro-cap companies. VTIAX covers everything else — developed markets like Japan, the UK, Germany, and France, plus emerging markets like China, India, Brazil, and Taiwan.
Together, the two funds hold over 12,000 stocks across 40+ countries. This is about as diversified as a stock portfolio can get. Vanguard itself uses this exact two-fund approach in its target-date retirement funds, splitting roughly 60/40 between U.S. and international stocks.
The key thing to understand: these are not substitutes. You don't pick one or the other — you pick how much of each to own. The question is allocation, not selection.
Performance: The Decade of U.S. Dominance (and Why It May Not Last)
Looking at the numbers, VTSAX has crushed VTIAX over the past decade — 14.57% annualized vs 9.63%. That's a massive gap, driven largely by the outperformance of U.S. mega-cap tech stocks (the "Magnificent Seven" and their predecessors).
| Time Period | VTSAX | VTIAX | Winner |
|---|---|---|---|
| 1-Year Return | 16.27% | 22.10% | VTIAX ✅ |
| 3-Year Annualized | 22.65% | 21.31% | VTSAX ✅ |
| 5-Year Annualized | 12.73% | 9.96% | VTSAX ✅ |
| 10-Year Annualized | 14.57% | 9.63% | VTSAX ✅ |
But here's the critical nuance: VTIAX is winning in 2026, returning 22.10% vs VTSAX's 16.27%. International markets are surging — European stocks have rallied, emerging markets are recovering, and the valuation gap between U.S. and international stocks is historically extreme.
History is clear: leadership rotates. From 2000-2009 (the "lost decade" for U.S. stocks), international stocks massively outperformed. From 2010-2024, U.S. stocks dominated. Investors who abandoned international stocks after the 2010s missed the current recovery. The lesson: hold both and rebalance.
Expense Ratios and Costs
Both funds are extremely cheap, but VTSAX is cheaper: 0.04% vs VTIAX's 0.12%. On $100,000 invested, that's $40/year vs $120/year.
Why is VTIAX more expensive? International index funds inherently cost more because of foreign transaction costs, withholding taxes, and the complexity of tracking stocks across 40+ countries in different currencies. A 0.12% expense ratio for an international total market fund is still among the lowest available anywhere.
Both funds require a $3,000 minimum investment. If you don't have $3,000 for each, consider Vanguard's ETF equivalents: VTI (VTSAX) and VXUS (VTIAX), which trade like stocks with no minimum.
Risk and Volatility
VTIAX has higher volatility — a standard deviation of 16.01% compared to VTSAX's 13.10%. International stocks carry risks that domestic stocks don't:
- • Currency risk: Returns are affected by USD exchange rate movements
- • Political risk: Regulatory changes, trade tensions, geopolitical events
- • Emerging market risk: ~25% of VTIAX is in emerging markets (China, India, Brazil, Taiwan)
- • Liquidity: Some smaller international stocks trade less frequently
However, here's the paradox: adding VTIAX to a VTSAX-heavy portfolio can reduce overall portfolio risk. Because U.S. and international stocks don't move in perfect lockstep (correlation is roughly 0.80-0.85), combining them produces a smoother ride than holding either one alone. This is the diversification benefit in action.
Dividend Yield
VTIAX offers a significantly higher dividend yield: 2.55% vs VTSAX's 1.05%. International companies tend to pay out a larger share of earnings as dividends compared to U.S. companies, which favor buybacks.
For income-focused investors, VTIAX's higher yield is a notable advantage. However, keep in mind that international dividends may be subject to foreign withholding taxes (partially recoverable via the foreign tax credit on U.S. tax returns).
How to Allocate: VTSAX vs VTIAX Split
There's no single "right" answer, but here are the most common approaches:
80/20 (U.S. Heavy)
80% / 20%
Strong U.S. bias. Simple. Worked well over the past decade. Misses a large chunk of global diversification. Common among investors who believe U.S. exceptionalism will continue.
60/40 (Market Weight) ⭐
60% / 40%
Approximately matches global market-cap weights. This is what Vanguard uses in its own target-date funds. Balanced diversification without excessive international exposure.
50/50 (Equal Weight)
50% / 50%
Maximum diversification. Slightly overweights international relative to market cap. Good for investors who want to hedge against U.S. concentration risk.
Our suggestion: Start with 60/40 (VTSAX/VTIAX) and rebalance annually. This is the closest to a "set it and forget it" global stock allocation. If you have strong convictions about U.S. vs international, adjust from there — but avoid going below 20% international.
Top Holdings Comparison
The funds have zero overlap — VTSAX holds only U.S. stocks, VTIAX holds only non-U.S. stocks.
VTSAX Top Holdings
- 1. NVIDIA (NVDA)
- 2. Apple (AAPL)
- 3. Microsoft (MSFT)
- 4. Amazon (AMZN)
- 5. Alphabet (GOOGL)
- 6. Broadcom (AVGO)
- 7. Meta Platforms (META)
- 8. Eli Lilly (LLY)
- 9. JPMorgan Chase (JPM)
VTIAX Top Holdings
- 1. Taiwan Semiconductor (TSM)
- 2. Samsung Electronics
- 3. ASML Holding (ASML)
- 4. SK Hynix
- 5. Tencent Holdings
- 6. HSBC Holdings
- 7. Roche Holding
- 8. Royal Bank of Canada
- 9. Novartis
Notice the geographic and sector diversification: VTSAX is heavily weighted toward U.S. tech. VTIAX brings exposure to Asian semiconductors, European pharmaceuticals, global banks, and consumer conglomerates — sectors and regions underrepresented in a U.S.-only portfolio.
VTSAX vs VTIAX: Which Should You Choose?
VTSAX only if you…
- ✅ Want maximum simplicity (one fund)
- ✅ Believe U.S. markets will continue to outperform
- ✅ Already get international exposure through your 401(k) or other accounts
- ✅ Want the lowest possible expense ratio
Both VTSAX + VTIAX if you…
- ✅ Want true global diversification
- ✅ Don't want to bet on one country's market
- ✅ Follow Vanguard's own asset allocation philosophy
- ✅ Want higher dividend income (VTIAX yields 2.55%)
- ✅ Want to reduce overall portfolio volatility through diversification
The evidence strongly favors holding both. Vanguard, Bogleheads, and most financial planners recommend 20-40% international allocation. The only debate is how much, not whether to include it.
Frequently Asked Questions
What is the difference between VTSAX and VTIAX?
VTSAX tracks the entire U.S. stock market (~3,640 stocks). VTIAX tracks stocks outside the U.S. (~8,500 stocks across 40+ countries). Together they cover the global stock market. They have zero overlap — VTSAX holds only domestic stocks, VTIAX holds only international stocks.
How should I split my portfolio between VTSAX and VTIAX?
A 60% VTSAX / 40% VTIAX split roughly matches global market-cap weights and is what Vanguard uses in its target-date funds. Other common splits are 70/30 or 80/20 for more U.S. exposure. Avoid going below 20% international — you'd be ignoring 40% of the global market.
Which has better returns: VTSAX or VTIAX?
VTSAX has dominated over the past decade (14.57% vs 9.63% annualized over 10 years). But VTIAX is leading in 2026 (22.10% vs 16.27%). Leadership rotates — international stocks outperformed in the 2000s, U.S. stocks dominated the 2010s. Holding both means you capture whichever market wins.
Is VTIAX riskier than VTSAX?
VTIAX has higher individual volatility (16.01% vs 13.10% standard deviation), plus currency and political risks. However, adding VTIAX to a VTSAX portfolio can actually reduce overall risk because the two don't move in perfect lockstep (correlation ~0.80-0.85).
Do I need both VTSAX and VTIAX?
Most experts say yes. The U.S. is about 60% of the global stock market — skipping VTIAX means ignoring 40% of investable global stocks. Vanguard, Bogleheads, and most financial planners recommend 20-40% international exposure for proper diversification.
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