Investing in Overseas Stocks from Korea: A Foreign Resident's Guide

Buying overseas stocks through a Korean brokerage is operationally simple, but the tax rules are not the same as buying Korean listed stocks. This guide keeps to rules that can be checked against official sources: Korean overseas-stock capital gains tax, Korean overseas financial account reporting, Korean dividend withholding basics, and US-person reporting pointers from IRS and FinCEN.

For the broader account map, read the personal finance accounts hub. For the brokerage account itself, read the Korean brokerage account guide.

Korean Capital Gains Tax

NTS says overseas stocks are subject to Korean capital gains tax when sold by a resident who has had an address or place of residence in Korea continuously for at least 5 years by the sale date.

That wording matters. The test is tied to resident status and continuous Korean address or residence by the sale date. If you are near the 5-year point, have left and returned, or have a borderline residence history, do not rely on a simple calendar-year shortcut. Ask a Korean tax agent (세무사) before making a large sale.

NTS also says domestic and overseas stock capital gains can be combined, and that the annual basic deduction is applied once to domestic and overseas taxable stock gains together at ₩2.5M. This is not a per-account deduction.

For filing, Easy Law says overseas-stock capital gains are not preliminary-filed. They are filed by final return from 1 May to 31 May of the following year. In practice, use Hometax (홈택스) or a tax office, and keep each brokerage's annual overseas-stock tax data file, trade confirmations, acquisition-cost records, and currency records.

Dividends

Dividends are not the same as sale gains. NTS says ordinary dividend income is withheld at a 14% national income tax rate. NTS also says that when foreign income tax has been paid, the withholding amount can be reduced by the foreign tax amount, capped at the Korean withholding amount.

That does not mean every cross-border dividend is settled automatically or identically. Source-country withholding, treaty paperwork, Korean withholding, and your overall Korean tax return can interact. If overseas dividends are large enough to matter, compare your Korean brokerage statement against the source-country withholding documents before filing.

For US dividends, IRS Form W-8BEN is the form non-US investors use to establish foreign status and, where applicable, claim a treaty withholding rate. IRS says failure to provide Form W-8BEN when requested may lead to 30% withholding. IRS also says a Form W-8BEN generally remains valid from the signing date through the last day of the third succeeding calendar year, unless a change in circumstances makes the form incorrect.

Overseas Financial Account Reporting

The Korean overseas financial account report is separate from overseas-stock capital gains tax.

NTS says a resident or domestic corporation must report when the combined balance of overseas financial accounts exceeds ₩500M on any month-end during the year. The rule is not only a year-end test. If any one month-end balance crosses the threshold, check the reporting duty.

NTS describes reportable overseas financial accounts as accounts opened with overseas financial companies for financial or virtual-asset transactions. Examples on the NTS page include bank accounts, securities accounts, derivatives accounts, virtual-asset accounts, and assets such as cash, stocks, bonds, funds, insurance products, and virtual assets held in those overseas accounts.

A Korean brokerage account is different. If your Apple, Microsoft, Japanese, Hong Kong, or other overseas stocks are held inside a Korean securities account, that account is not opened with an overseas financial company. If you also keep accounts at foreign-domiciled institutions, such as overseas banks, foreign brokerages, or foreign virtual-asset platforms, check the NTS reporting rule.

NTS says the report uses the overseas financial account report form and is filed from 1 June to 30 June of the following year through the tax office, Hometax, or Sontax.

Foreign residents have a specific exemption. NTS says a foreign resident is exempt when, during the 10 years before the end of the reporting year, the total period with an address or place of residence in Korea is 5 years or less. This is a cumulative 10-year lookback, not the same as the continuous 5-year capital-gains test above.

The penalty rules are serious. NTS says non-filing or under-reporting can trigger a 10% penalty on the unreported or under-reported amount, capped at ₩1B. NTS also says failure to explain the source of funds, or a false explanation, can trigger an additional 10% penalty on the unexplained or falsely explained amount. If the non-reported or under-reported amount exceeds ₩5B, NTS says public disclosure and criminal penalties can apply.

US Persons

This section applies only to US citizens, US permanent residents, and other US tax residents. It is a reporting map, not US tax advice.

The IRS Form 8621 instructions define a Passive Foreign Investment Company (PFIC) as a foreign corporation that meets either a 75% passive-income test or a 50% passive-asset test. IRS says a US person who is a direct or indirect shareholder of a PFIC generally files Form 8621 in specified circumstances, and that a separate Form 8621 is filed for each PFIC.

This is why US persons should be cautious with non-US ETFs and funds, including Korean-listed ETFs. The PFIC question is a US classification question about the fund structure, not a Korean tax benefit question. Before buying Korean ETFs inside a brokerage account, ISA, IRP, or pension savings account, ask a US tax professional whether Form 8621 applies.

FinCEN says a US person with a financial interest in, or signature authority over, foreign financial accounts must file FBAR if the aggregate value of foreign financial accounts exceeds US$10,000 at any time during the calendar year. Korean bank, brokerage, ISA, IRP, and pension savings accounts may be foreign financial accounts for US purposes even when they are not overseas financial accounts for Korean NTS reporting.

Form 8938 is separate from FBAR. IRS says foreign financial accounts, foreign stock or securities held outside a financial account, interests in foreign entities, and foreign pension or deferred compensation plans may be specified foreign financial assets. IRS also says filing Form 8938 does not relieve a taxpayer of the FBAR obligation, and vice versa.

Before You Trade

Use this checklist:

1. Confirm whether you are a Korean tax resident.
2. Count whether you have had a Korean address or place of residence continuously for at least 5 years by the planned sale date.
3. Keep annual brokerage tax data files and trade records.
4. Separate Korean brokerage accounts from foreign-domiciled accounts when checking the ₩500M overseas financial account report.
5. If you are a US person, check PFIC, FBAR, and Form 8938 before buying non-US funds or holding large Korean account balances.
6. Get Korean and home-country tax advice before large sales, large dividends, or a departure from Korea.

FAQ

Does Korea tax every overseas stock sale by a foreign resident?

No. NTS frames the taxable overseas-stock category as sales by a resident who has had a Korean address or place of residence continuously for at least 5 years by the sale date. If your residence history is close to the line, confirm the date analysis before selling.

Is the ₩2.5M deduction per brokerage account?

No. NTS says the annual basic deduction is applied once to domestic and overseas taxable stock gains together at ₩2.5M.

When do I file Korean tax on overseas stock gains?

Easy Law says overseas-stock capital gains are handled by final return from 1 May to 31 May of the following year. Use Hometax or a tax office, and keep brokerage records.

Do Korean brokerage accounts count as overseas financial accounts for the ₩500M report?

The NTS rule is about accounts opened with overseas financial companies. A Korean brokerage account is not opened with an overseas financial company, even if it holds US or other foreign stocks. If you also hold Schwab, IBKR, overseas bank, foreign insurance, or foreign virtual-asset accounts, check the NTS rule carefully.

I am a US citizen. Is Korean tax the only thing I need to check?

No. US persons may also have IRS and FinCEN reporting duties. Check PFIC/Form 8621 before buying non-US funds, FBAR if foreign financial accounts exceed US$10,000, and Form 8938 if the specified-asset thresholds apply.

@misc{seoulstart-overseas-stocks-korea-foreign-residents,
  author = {{Seoulstart Editorial Team}},
  title = {{Investing in Overseas Stocks from Korea: A Foreign Resident's Guide (2026)}},
  year = {2026},
  publisher = {Seoulstart},
  url = {https://seoulstart.com/guides/overseas-stocks-korea-foreign-residents},
  note = {Last updated June 6, 2026}
}