Overseas Stock Capital Gains Tax in Korea for Foreign Residents

Who this guide is for

• Foreign residents selling overseas shares through Korean or foreign brokers
• Residents approaching five continuous years in Korea
• Foreign employees selling shares after an RSU or stock-option event

Key points

• Check Korean tax residence and continuous residence history before calculating tax.
• Overseas shares, dividends and employment stock benefits are separate questions.
• Keep acquisition costs, sale proceeds, fees and KRW conversion evidence.
• Review annual filing and other overseas reporting obligations separately.

Detailed explanation

Check residence history before calculating

NTS guidance says overseas shares sold by a resident who has continuously maintained a Korean domicile or residence for at least five years up to disposal are within the overseas-share capital gains rules. Its published interpretation also addresses a sale before five years of continuous residence.

Build a dated timeline of arrival, residence changes and the proposed sale. A visa expiry date or an entry stamp alone may not resolve tax residence. Do not substitute the separate residence tests used for other foreign-income provisions. Ask for individual advice if departures, a second home or treaty residence make the timeline unclear.

For the broader residence framework, see Korea tax residency rules.

Classify the transaction

Identify the issuer, security, transaction and relevant dates rather than relying only on where the broker is located. Keep fund and ETF documentation when product classification is uncertain.

Use the Korean stock capital gains guide for domestic shares. For employment awards, see stock options and RSUs.

Prepare a transaction worksheet

Create one row for each disposal with acquisition references, quantity, sale evidence, costs and fees. Attach records for splits, mergers, transfers or other events affecting the holding. A transferred account can lose the acquisition history displayed by the receiving broker, so obtain the original records early.

Do not translate a single annual dollar profit into won and assume the calculation is complete. Review the applicable conversion method and transaction dates. See foreign income conversion to KRW for record preparation.

Review aggregation and deductions

Before completing a return, check which gains and losses may be combined and which deduction applies. Do not combine unrelated asset classes or claim a deduction independently for every broker account. Use the current NTS overseas-stock materials and retain the computation supporting the result.

A foreign tax payment also needs a separate review. Keep the foreign return or withholding evidence and ask whether relief is available under the applicable domestic rules and treaty. Do not assume the Korean liability is reduced automatically by every amount charged abroad.

Keep the filing calendar separate

The August 2026 NTS announcement explains that overseas shares do not use the domestic-share preliminary filing route and directs qualifying 2026 gains to the May 2027 final filing period. Check the final deadline and filing requirement for the relevant year, including any applicable adjustment or relief.

Keep capital gains preparation separate from dividend reporting and ordinary annual income tax work. Filing one return does not establish that every other obligation has been completed.

Before selling or submitting

Confirm residence history, asset classification and available acquisition evidence before a large or complex disposal. Keep copies of the calculation, submitted return and payment confirmation. Also assess overseas financial-account reporting separately; a capital gains return is not a substitute for that review.

This guide was reviewed on October 13, 2026. Recheck the official rules for the disposal year, especially where residence, inherited or gifted holdings, employee awards or cross-border relief affect the result.

Documents you may need

• Residence history
• Trade confirmations
• Acquisition costs and fees
• Corporate action records
• KRW conversion worksheet

Common mistakes

• Assuming foreign nationality automatically exempts overseas gains
• Confusing continuous residence with a different foreign-income residence test
• Reporting only money transferred to a Korean bank
• Using a broker profit summary without supporting transactions
• Treating an RSU employment benefit and later stock sale as one tax event

When should you ask a tax professional?

Ask a qualified tax professional if you have income from several countries, business income, unclear tax residency, treaty questions, missing documents, late filing concerns, or a visa situation that depends on tax records. This site explains general patterns only and cannot review your personal facts.

FAQ