Domestic Korean stocks typically face no separate individual capital gains tax outside specific large-shareholder rules - a habit many Korean investors carry with them without realizing it does not extend to US shares. Overseas stocks, US included, fall under a dedicated regime: a flat 22% capital gains tax above a modest annual exemption.
This guide covers what you can buy, the treaty’s 15% dividend rate, and exactly how the 22% overseas-stock tax works.
Everything here is verified from official sources for 2026.
Meet Jiho
Jiho is 31, lives in Seoul, and works in gaming. He has traded Korean stocks for years without ever thinking about capital gains tax - it simply has not applied to him as an individual investor. He wants to add US equity exposure and assumes the same tax-free experience will carry over. It will not, and understanding why before his first sale saves a surprising tax bill later.
Step 1: Which US Funds Reach South Korea
South Korea does not fall under PRIIPs, so the restriction that limits European residents to UCITS versions is irrelevant here. Jiho can buy VOO, VTI, and QQQ directly through a broker offering US market access.
Step 2: What the South Korea Treaty Gives You
The US-Korea tax treaty caps US withholding on dividends paid to Korean resident individuals at 15% for portfolio investors, claimed with Form W-8BEN.
| Income Type | Default US Rate | Treaty Rate (Portfolio) |
|---|---|---|
| Dividends | 30% | 15% |
| Capital gains (securities) | Generally not US-taxable for non-residents | Taxed under Korean domestic law |
No form means 30% withheld, beginning with the first distribution.
For the full treaty mechanics, see our US-South Korea tax treaty guide.
Step 3: The 22% Overseas Stock Capital Gains Tax
This is the detail most likely to surprise a Korean investor used to domestic-market tax treatment.
For a Korean tax resident, capital gains on foreign stocks - US shares included - are taxed at a flat 22% (already inclusive of the local income tax surcharge), applied to net trading profit above an annual KRW 2.5 million exemption.
Loss offsetting works within the tax year: gains and losses across different overseas stock positions in the same year net against each other before the exemption and 22% rate apply.
Worked example: Jiho realizes KRW 30 million in gains and KRW 5 million in losses on US stocks in the same year. Net gain: KRW 25 million. After the KRW 2.5 million exemption: KRW 22.5 million taxable. Tax at 22%: KRW 4.95 million.
A 2026 incentive worth knowing about: Korea introduced a temporary measure for 2026 allowing individual investors who sell overseas stocks held as of a specified late-2025 reference date, repatriate the proceeds, and invest in domestic Korean equities for at least one year to access an exemption of up to KRW 50 million - well above the standard KRW 2.5 million. This is a policy-driven, time-limited measure - confirm current eligibility, reference dates, and conditions with a Korean tax advisor or the National Tax Service before assuming it applies to a specific sale.
Why a measure like this exists at all: Korean tax policy has periodically used incentives like this to encourage capital that flowed overseas (into US stocks, often via the same brokers covered in this guide) to redirect back into the domestic Korean market - a policy goal distinct from any change in the underlying tax treatment of holding US stocks generally. This kind of incentive tends to be genuinely temporary and tied to specific conditions (holding dates, repatriation, minimum domestic holding periods) rather than a permanent expansion of the exemption, which is exactly why confirming current terms directly rather than assuming a prior year’s rules still apply is worth the extra step before relying on it for a specific, large sale.
Step 4: The W-8BEN Step for South Korea Residents
Form W-8BEN goes to Jiho’s broker and brings his US withholding down from the 30% default to the treaty’s 15%.
Step 5: The Broker Decision in South Korea
You can open an account from South Korean with Interactive Brokers (IBKR) or with eToro. See our full IBKR review → · See our full eToro review →
Step 6: What Jiho’s Portfolio Looks Like in Practice
Broker: Interactive Brokers, chosen for cost as the position grows.
Portfolio allocation:
- 70% VOO (S&P 500, bought directly)
- 30% QQQ (Nasdaq-100, bought directly)
- Jiho realises gains in deliberate slices each year rather than in one large sale, because Korea’s annual basic deduction on overseas capital gains is use-it-or-lose-it
- W-8BEN filed and confirmed active (15% withholding on his dividend statement)
Annual tax situation:
- 15% US withholding on dividends
- Any overseas stock capital gains taxed at 22% above the KRW 2.5 million annual exemption, with losses netted against gains within the year
He tracks his lot-level gains and losses across the year so that, at tax time, he can net them correctly before the exemption and 22% rate apply, rather than calculating each sale in isolation.
The Errors Worth Avoiding on South Korea
Assuming domestic Korean stock tax habits carry over. They do not - overseas stocks, including US shares, fall under a separate 22% regime.
Not tracking losses across positions. Losses on other overseas holdings can offset gains before the exemption and 22% rate apply - skipping this leaves money on the table.
Forgetting W-8BEN. An unfiled form costs the difference between 15% and 30% on every dividend you receive.
Assuming the 2026 repatriation incentive applies automatically. It has specific reference dates and conditions - confirm current eligibility before relying on it.
Your First Week Investing From South Korea
- Open a broker account. IBKR or eToro, both confirmed to accept South Korean residents.
- File your W-8BEN during account opening.
- Buy VOO or QQQ in their US form - the UCITS workaround is for EU residents.
- Track gains and losses by lot across the year to plan around the KRW 2.5 million exemption.
Educational content about South Korea; it carries no advice for your case. Treaty rates are based on the US-Korea Income Tax Convention. Korea’s overseas stock capital gains rate, annual exemption, and the temporary 2026 repatriation incentive are set by Korean tax law and can change - consult a qualified Korean tax advisor or the National Tax Service for advice specific to your situation.
Frequently Asked Questions
Can I buy VOO and QQQ directly as a South Korean investor? Yes. US-domiciled ETFs are directly available from South Korea - PRIIPs applies to European residents only.
What’s the US withholding rate on my dividends? 15%, under the US-Korea tax treaty, once Form W-8BEN is filed with your broker. Without it, the default 30% applies.
Does Korea tax my US stock capital gains the way it taxes Korean stocks? No. Domestic Korean shares typically face no separate individual capital gains tax outside large-shareholder rules, but US and other overseas stocks fall under a dedicated regime: a flat 22% tax above a KRW 2.5 million annual exemption.
Can losses offset gains for this calculation? Yes. Gains and losses across different overseas stock positions in the same year net against each other before the exemption and 22% rate apply.
Which brokers accept South Korean residents? Interactive Brokers and eToro are both confirmed to accept South Korean residents for account opening.
Sources: US-Korea Income Tax Convention; IRS treaty text; IRS Technical Explanation of the Convention; IRS Publication 515 (2026).
