International Index Funds: Investing Globally
A U.S.-only portfolio skips roughly 40% of the world's stock-market value. International index funds close that gap in one cheap, diversified position. Here's how to choose.
Don't have time? Here's what you need to know:
- 1The U.S. is only about 60% of global stock-market value; international funds capture the other ~40%.
- 2VXUS holds all non-U.S. markets; VEA is developed-only and VWO is emerging-only.
- 3International returns include currency movement against the dollar, so they can diverge from local-market moves.
- 4A common allocation is 20-40% of equities international; the key is sticking with it when the U.S. leads.
What a U.S.-Only Portfolio Leaves Out
Even a 'total U.S. market' fund owns zero shares of Nestlé, Toyota, ASML, Samsung, or Novo Nordisk. The United States is the largest single equity market, but it represents only around 60% of global stock-market value — meaning a U.S.-only investor skips roughly 40% of the world's public companies. International index funds exist to capture that other slice in a single, low-cost holding.
The case for owning it is diversification, not a prediction. U.S. and foreign stocks lead in different decades; through much of the 2000s, international and emerging markets outpaced the U.S., while the 2010s ran the other way. Owning both means you don't have to guess which region wins next — you hold the whole world and let the long-run global return accrue.
Developed vs Emerging Markets
International investing splits into two buckets. Developed markets cover established economies like Japan, the UK, Germany, France, Canada, and Australia — relatively stable, with mature companies and lower volatility. Emerging markets cover faster-growing but riskier economies like China, India, Taiwan, Brazil, and South Korea, where higher potential return comes with bigger swings and more political and currency risk.
You can buy them separately or together. VEA holds developed markets only; VWO holds emerging markets only. Or you can own both in one fund: VXUS (total international, the ETF twin of the VTIAX mutual fund) bundles developed and emerging ex-U.S. markets into a single position, which is the simplest way for most investors to get complete international coverage.
| Fund | Coverage | Risk/return profile |
|---|---|---|
| VXUS | All non-U.S. (developed + emerging) | Broadest one-fund international |
| VEA | Developed markets only | More stable, mature companies |
| VWO | Emerging markets only | Higher growth, higher volatility |
Currency Risk: The Extra Variable
When you own international stocks, your return has two moving parts: how the stocks perform in their local currency, and how that currency moves against the U.S. dollar. If foreign stocks rise 8% but their currencies fall 3% against the dollar, your dollar return is closer to 5%. A strengthening dollar drags on international returns; a weakening dollar boosts them.
Most broad international index funds, including VXUS and VEA, are unhedged, meaning you take this currency exposure as part of the package. Over the long run, currency swings tend to wash out and even add a small diversification benefit. It mainly matters that you understand why an international fund's dollar return can differ from the headline foreign-market move.
Tip: Don't be alarmed when an international fund's return diverges from the foreign index it tracks. A chunk of the gap is usually currency movement, not tracking error.
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How Much International Should You Hold?
Pinning down the ideal international weight is one question that lacks a tidy answer, and thoughtful investors disagree. A market-cap purist would hold international at its global weight — roughly 40% of your stock allocation. Vanguard has often suggested somewhere around 30-40% of equities in international. Others, citing the U.S. market's strong recent run and the global revenue of U.S. multinationals, hold less or none. A common practical range lands between 20% and 40% of the stock side.
What matters more than hitting a precise number is picking an allocation you'll stick with through the inevitable stretches when international lags. A simple two- or three-fund portfolio — VTI for U.S. and VXUS for the rest of the world, optionally with BND for bonds — gives you full global equity diversification in one or two extra positions.
Important: Avoid abandoning your international allocation just because the U.S. has outperformed recently. Performance leadership rotates between regions, and chasing the recent winner is a classic way to buy high.
Frequently Asked Questions
Why should I own international index funds?
Because a U.S.-only portfolio misses roughly 40% of global stock-market value and every company headquartered abroad. U.S. and international stocks lead in different decades, so owning both diversifies your equity exposure and removes the need to guess which region will outperform next. One fund like VXUS captures the entire non-U.S. market cheaply.
What's the difference between VXUS, VEA, and VWO?
VXUS is total international — it holds both developed and emerging markets outside the U.S. in one fund. VEA holds only developed markets (Japan, Europe, Canada, Australia), which are more stable. VWO holds only emerging markets (China, India, Taiwan, Brazil), which offer higher potential growth with more volatility. VXUS essentially equals VEA plus VWO.
How much of my portfolio should be in international index funds?
There's no universal answer. A market-cap approach would put around 40% of your stock allocation abroad, and Vanguard has often suggested roughly 30-40% of equities in international. Many investors land between 20% and 40%. The most important thing is choosing an allocation you can hold through the periods when international underperforms.
What is currency risk in international index funds?
Your return depends on both how foreign stocks perform locally and how those currencies move against the U.S. dollar. A stronger dollar reduces your dollar-denominated returns; a weaker dollar boosts them. Most broad international funds like VXUS are unhedged, so you take this exposure, though currency swings tend to wash out over long periods.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.