Emerging Markets in a Diversified Portfolio: 4 Steps for High-Income Families

By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.

Emerging markets belong in a diversified portfolio as a small, deliberate slice of the stock allocation, held through a broad, low-cost index fund rather than single-country bets. Their job is to add exposure to economies and companies your other holdings barely touch. They are not a growth shortcut, and they come with currency, political and governance risks that US stocks do not.

For a California or Washington family earning $750,000 to $3 million, the more useful question is how emerging markets fit next to what you already own. If a large share of your net worth is employer stock from Apple, Amazon, Gilead or Genentech, your portfolio is already a concentrated bet on US companies. That changes how you size the emerging markets slice, where you hold it, and how you pay for it.

What emerging markets add, and what they do not

Emerging markets are economies that are still industrializing or building out their financial systems. Index providers group countries such as China, India, Taiwan, South Korea, Brazil and Saudi Arabia in this bucket, and a broad fund holds hundreds or thousands of companies across them.

The honest case for owning them:

• Different drivers. Their returns depend on local growth, commodity prices, local currencies and domestic policy. Over long stretches they have moved differently from US large-cap stocks, which is the point of diversification.
• Companies you cannot get elsewhere. Many of the world’s chip foundries, banks and consumer brands that serve fast-growing middle classes are based in these markets and do not appear in US stock indexes such as the S&P 500.
• Valuation spread. When US stocks are expensive relative to the rest of the world, a market-weight allocation keeps you from betting everything on one country staying expensive.

What they do not do: fast GDP growth does not reliably turn into higher stock returns for foreign shareholders. Share dilution, state-owned companies and weak minority-shareholder rights can leave investors with less of that growth than the headlines suggest. Treat any forecast that emerging markets “should” beat US stocks with caution.

The hidden risks in emerging markets

• Currency. You own assets priced in rupees, won or reais. A stronger dollar can erase a year of local gains.
• Political and legal risk. Governments can change rules overnight, restrict capital flows or target whole industries. Sanctions and capital controls can trap holdings, as happened to Russian shares held by US funds in 2022, when foreign investors were largely unable to sell.
• Index concentration. A “diversified” emerging markets fund is still dominated by a handful of countries and a few very large companies. Check the top holdings before you buy.
• Overlap with your job. If you work in semiconductors or consumer tech, the largest emerging markets holdings may be your employer’s suppliers or competitors. That is less diversification than it looks.
• Volatility. Drops of a third or more have happened several times. A small allocation is easier to hold through those drops than a large one.

Four steps to add emerging markets to a diversified portfolio

Step 1: Count what you already own

List every account: 401(k), taxable brokerage, vested RSUs, unvested grants, ESPP shares, 529s and any deferred compensation. Add up your exposure to your employer and to US stocks overall. Many high-income W-2 households find that employer stock alone is 25% to 50% of investable assets, and most target-date or S&P 500 funds in their 401(k) add more US large-cap exposure on top. Emerging markets are a small fix for that. Diversifying the employer stock itself is the bigger one, and each RSU vest is the cheapest moment to do it, because shares sold at vest carry almost no gain.

Step 2: Pick a target range and write down why

There is no correct number. Common reference points are zero (a home-country tilt), market weight within global stocks, or something in between. What matters is that you choose a range, for example 5% to 10% of your stock allocation, and write down the reasoning, including what would make you change it. A written rule is what keeps you from selling after a bad year or doubling up after a good one.

Step 3: Choose a broad, low-cost fund

For most families, a total emerging markets index fund or ETF is enough. Compare the expense ratio, the index it tracks (some include South Korea, some classify it as developed), the number of holdings and how closely it has tracked its index. Avoid single-country funds and thematic products unless you have a specific reason you can explain in two sentences. Actively managed emerging markets funds typically cost more, and the fee comes off your return every year. Our guide to how fund fees affect your return shows the math.

Step 4: Place it in the right account and rebalance with a rule

Emerging markets funds pay dividends that have often had foreign tax withheld. In a taxable account you can usually claim a foreign tax credit for that withholding. Inside a 401(k) or IRA, the credit is lost. If all your foreign income is passive (such as fund dividends), it is all reported on a payee statement such as Form 1099-DIV, and your creditable foreign taxes are $600 or less on a joint return ($300 for other filers), you can generally claim the credit without filing Form 1116 (IRS Form 1116 instructions). The trade-off: dividends in a taxable account are taxed every year, and some emerging markets dividends are not “qualified,” so they are taxed at ordinary rates federally. Set a rebalancing band (for example, rebalance when the slice drifts more than a few percentage points from target) and use new contributions or RSU proceeds to rebalance before selling anything.

Worked example: a $1.1 million household in Cupertino

Assumptions (illustrative): married couple, both W-2, two children ages 4 and 8, $1.1 million combined income, $3 million investable assets. Of that, $900,000 is vested employer stock, $700,000 is in 401(k)s in a US index fund, and $1.4 million is a taxable brokerage account in a US total market fund and bonds.

Here the family sells $300,000 of employer stock and splits the proceeds (ignoring taxes on the sale for simplicity) between international developed and emerging markets funds in the taxable account. Emerging markets end up at about 4% of the $2.4 million stock allocation ($100,000 of $2.4 million), just below a written 5% to 10% range they plan to reach with future RSU vests.

The tax cost depends on gain, not sale size. RSU shares sold shortly after vest have little gain, because the value at vest was already taxed as wages. Older shares with a large gain cost more. For 2026, federal long-term gains are taxed at 20% on joint taxable income above $613,700 (IRS Rev. Proc. 2025-32), plus the 3.8% Net Investment Income Tax above $250,000 of modified AGI (IRS). California has no lower rate for capital gains and taxes them as ordinary income, up to 13.3% under the 2025 rate schedule, the latest published (FTB). So a family in this position would typically sell its lowest-gain lots first.

How California and Washington change the math

California: every dollar of gain, and every dividend, is taxed at your ordinary state rate, with the top 13.3% rate (2025 rate schedule, the latest published) including a 1% Behavioral Health Services Tax on taxable income over $1 million (FTB 2025 rate schedules). That makes foreign tax credits and low-turnover index funds more valuable, and it is a reason to rebalance with new money rather than by selling.

Washington: there is no tax on wages in 2026, but the state taxes long-term capital gains at 7%, rising to 9.9% on gains above $1 million (WA DOR), after a standard deduction that was $278,000 for 2025. An Amazon executive in Bellevue selling $300,000 of long-held shares with a $200,000 gain, and no other gains that year, would typically owe no Washington capital gains tax. Note also that Washington has enacted a 9.9% income tax on AGI over $1 million starting in 2028 (WA DOR), so high earners should not plan on no state income tax indefinitely.

Common mistakes

• Buying emerging markets because a forecast says they will grow faster, then selling after the first 30% drop.
• Adding emerging markets while leaving 40% of net worth in one employer’s stock.
• Holding the fund only in a 401(k) and losing the foreign tax credit, when taxable space is available.
• Owning three overlapping international funds and not knowing the total.
• Paying an active-management fee for an allocation an index fund covers.

What to document for your kids

Write a one-page Decision Memo: the target range you chose, why, what you would do after a 30% drop, and when you would revisit it. Your children will see the account balance one day. The memo tells them how you thought about risk you could not control. As Kevin Luu puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.”

Frequently asked questions

How much of my portfolio should be in emerging markets?

There is no single right figure. Many diversified portfolios hold somewhere between zero and market weight within global stocks. For a high-income family already concentrated in US tech through RSUs, a modest written range, such as 5% to 10% of stocks, is a common starting point. The range matters less than writing it down and sticking to a rebalancing rule.

What is the best way to invest in emerging markets?

For most families, a broad emerging markets index fund or ETF with a low expense ratio and hundreds of holdings. It spreads company and country risk and keeps costs low. Single-country funds and actively managed funds add cost and concentration that most households do not need, especially when a large share of their wealth already sits in one employer’s stock.

Should emerging markets go in my 401(k) or my taxable account?

If you have room in a taxable account, holding the fund there usually lets you claim a foreign tax credit for taxes withheld on dividends, which is lost inside a 401(k) or IRA. The cost is annual tax on the dividends. California residents pay ordinary state rates on them, so compare both options with your tax preparer.

Next step

Pull your last statement from every account, including vested RSUs, and add up your US and employer exposure before you choose an emerging markets range. Our pages on US versus international stocks, family office asset allocation and investment and risk management cover the wider portfolio, and tax management covers selling concentrated stock. This is general education, and the right move depends on your family’s full picture.

Written by

Kevin Luu

Co-Founder and Chief Learning Officer, Bright Advisers

Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.

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