FILE / VWO-IEMG
2026 edition
EMERGING-MARKETS ETF PAIR
VWO vs IEMG: emerging markets in two ETF wrappers
Both ship at 0.07 percent. The composition difference is South Korea: FTSE classifies it as developed, MSCI as emerging. That single classification choice produces meaningfully different country weights.
QUICK VERDICT
read this if nothing elsePick the ETF if
IEMG (MSCI methodology) if you want South Korea classified as emerging and held in your EM allocation. The MSCI emerging-markets benchmark is more widely cited in institutional research.
Pick the index fund if
VWO (FTSE methodology) if you want South Korea moved to your developed-markets allocation alongside Japan and Australia. Vanguard's mutual-fund counterpart VEMAX gives a tax-free cross-share-class path inside Vanguard.
Both deliver broad emerging-markets equity exposure at 0.07 percent. VWO tracks the FTSE Emerging Markets All Cap China A Inclusion Index per the Vanguard VWO product page. IEMG tracks the MSCI Emerging Markets Investable Market Index per the iShares Core MSCI Emerging Markets ETF page. Both include large, mid, and small-cap stocks from emerging-market countries. Country weights diverge meaningfully because of the South Korea classification.
MSCI publishes its annual market classification review that determines emerging versus developed status. FTSE publishes a similar review. Reclassifications (most recently for Argentina) trigger fund-level rebalancing.
FIG. A / SPEC SHEET
Side by side
SECTION 02 / THE SOUTH KOREA QUESTION
Same country, two emerging-versus-developed verdicts
South Korea is a wealthy, industrialised country with a stable democracy, a developed financial system, and modern equity-market infrastructure. By those criteria, FTSE classifies it as a developed market, alongside Japan, Australia, the UK, and Western Europe. MSCI maintains its emerging-markets classification, citing limits on foreign investor access to the Korean won and constraints on currency convertibility for foreign institutional investors.
For the investor, this means: VWO (FTSE) does not include Samsung, SK Hynix, or Hyundai. IEMG (MSCI) does, with South Korea typically running 12 to 16 percent of total fund weight. If you hold VEA (Vanguard developed ex-US, FTSE) you already own South Korea. If you hold IEFA (iShares developed ex-US, MSCI) you do not.
The matched-pair logic to avoid double-counting or gaps:
- FTSE family: VEA (developed including South Korea) + VWO (emerging without South Korea).
- MSCI family: IEFA (developed without South Korea) + IEMG (emerging including South Korea).
- Mixing: Either combination of total ex-US (IXUS or VTIAX) avoids the issue by holding the entire ex-US universe in one fund. See the IXUS versus VTIAX page for that approach.
SECTION 03 / CHINA EXPOSURE IS THE OTHER VARIABLE
Both funds are concentrated in China
China typically runs 28 to 35 percent of either VWO or IEMG depending on relative market-cap movements. The next-largest country exposures are India (15 to 20 percent), Taiwan (15 to 20 percent), Brazil (5 to 8 percent), and Saudi Arabia (3 to 5 percent), followed by smaller emerging markets.
VWO's "China A Inclusion" naming refers to its inclusion of China A-shares, the mainland-listed Chinese equities that were previously inaccessible to foreign investors. IEMG also includes A-shares but at a slightly different inclusion factor under MSCI's methodology. Both funds therefore give you broader China exposure than older emerging-markets ETFs that excluded A-shares.
For investors uncomfortable with the China weight, the alternatives are EMXC (iShares MSCI Emerging Markets ex China) or XCEM (Columbia Emerging Markets ex China Connect). These ex-China EM funds carry meaningfully higher expense ratios (~0.18 to 0.25 percent) and lower liquidity. Removing China removes roughly one third of the emerging-markets asset class.
SECTION 04 / FOREIGN-TAX-CREDIT WORKS THE SAME WAY
EM dividends carry foreign withholding tax in a taxable account
Both VWO and IEMG pay foreign withholding tax to the source-country governments on dividend distributions before the income reaches the fund. Both pass the gross dividend and the foreign tax paid through to you on your 1099-DIV. In a taxable account, you claim the foreign tax credit on IRS Form 1116 or directly on your 1040 if foreign tax is below $300 single or $600 joint.
Inside a tax-advantaged account (Roth IRA, Traditional IRA, 401(k), HSA), you cannot claim the foreign tax credit because the account is not subject to US tax. This means EM funds give up roughly 8 to 12 percent of gross dividend yield to foreign withholding inside a tax-advantaged account, recoverable in a taxable account. The same placement argument applies as for total-international funds: see the taxable brokerage page for the full Bogleheads tax-efficient placement framework.
DESK Q&A
Frequently asked
Q01Should I split developed and emerging international or hold a total ex-US fund?
Both work. Splitting (VEA + VWO or IEFA + IEMG) lets you control the relative weights and reduces blended expense ratio by 1 to 2 basis points. A single total-ex-US fund (VXUS, IXUS, VTIAX) is one fewer fund to rebalance and adds 1 to 2 basis points of expense. For a tilt toward emerging markets above the market-cap weight (currently around 24 percent of ex-US), splitting lets you overweight EM. For a market-cap-weighted approach, the single-fund choice is simpler.
Q02Why is VWO cheaper than VEU?
VWO is emerging-markets-only at 0.07 percent. VEU (Vanguard FTSE All-World ex-US) is total ex-US at 0.05 percent. The lower headline on VEU reflects the developed-markets bias of total-ex-US funds and the lower management complexity. VWO costs more than VEU because emerging-markets fund management is operationally more expensive (more thinly traded markets, more rebalancing, more currency hedging).
Q03Are VWO and IEMG tax-efficient?
Both use the standard ETF in-kind creation and redemption mechanism, so capital-gains distributions are typically near zero per their issuer-filed annual reports on SEC EDGAR. The dividend yield is meaningful (typically 2.5 to 3.5 percent on emerging-markets equities) and that yield is taxed each year in a taxable account at qualified dividend rates if eligible. The foreign tax credit recovers most of the foreign withholding.
Q04Should I overweight emerging markets relative to market-cap?
Portfolio-construction question. The market-cap weight of emerging markets is currently around 24 percent of ex-US equities and 11 percent of global equities. Some investors overweight EM (to 30 to 40 percent of ex-US) on the argument that EM carries higher expected returns from higher growth rates. Others underweight EM (to 0 to 15 percent) on the argument that EM equity returns have not historically rewarded the higher volatility. The empirical record supports neither view strongly. Pick based on your conviction and stick with it.
Q05Can I hold both VWO and IEMG?
Mechanically you can but it produces little diversification benefit. The two funds hold approximately 75 to 85 percent overlap by holdings (the South Korea and small-cap inclusion thresholds drive most of the difference). The IRS may consider them substantially identical for wash-sale purposes. Pick one.
Q06Has VWO outperformed IEMG?
Annualised return differences over rolling 5-year windows are typically less than 0.3 percentage points and the leadership flips depending on whether South Korea (in IEMG, not in VWO) led or lagged in the period. For practical retail investing, treat them as equivalent on returns.
DESK ROUTING
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