Can You Open a Korean ISA From Japan? (2026)

If you’re a foreign resident in Japan and you’ve come across Korea’s ISA (Individual Savings Account) while researching ways to invest in Korean markets, here’s the short answer: it’s very unlikely to be available to you — not because of your nationality, but because of how Korean tax residency works.

What Is Korea’s ISA?

Korea’s ISA lets you hold deposits, funds, and stocks in a single account with a tax break on the income. It isn’t fully tax-free: interest and dividends are tax-free up to KRW 2 million (KRW 4 million for lower earners), and anything above that is taxed at a flat 9% instead of being added to your other income.

Under Article 91-18 of the Special Tax Treatment Control Act, it’s limited to Korean tax residents aged 19 or older — or 15 or older with earned income in the previous year. It’s one account per person, with a minimum 3-year term and contributions of KRW 20 million a year (unused room carries forward) up to KRW 100 million in total. These are the figures in the law as of September 18, 2026.

⚠️ The key word is “resident.” This isn’t about Korean citizenship — it’s a Korean tax residency test, and almost no one based full-time in Japan meets it.

Why Foreign Residents in Japan Almost Never Qualify

Under Korean tax law, you’re a resident if you maintain a domicile in Korea or stay there 183 days or more in a year. If you’re planning to live abroad for a year or longer and have no ongoing base of life in Korea, you’ll generally be classified as a non-resident — and non-residents cannot open a new ISA.

This test applies regardless of nationality. In practice, it’s mainly relevant to Korean nationals living abroad who sometimes retain “resident” status because of family or assets still in Korea — a foreign national living in Japan with no such ties simply doesn’t fall into either category; the ISA program isn’t designed with you in mind.

So What Can Foreign Investors in Japan Actually Do?

If Korea’s ISA is off the table, there are still legitimate ways to get exposure to Korean markets:

• Open a Korean brokerage account directly — Since December 14, 2023, foreign investors no longer need to register with Korea’s Financial Supervisory Service before investing in listed securities. Individuals are identified by their passport number, which has simplified direct access to the KRX (Korea Exchange).
• Buy Korea-focused ETFs listed overseas — For example, the iShares MSCI South Korea ETF (EWY) tracks the MSCI Korea 25/50 Index. No Korean paperwork required, though you get index-level rather than direct-stock exposure. Check whether your Japanese broker offers it.
• Ask your broker about Korean shares — Foreign brokers can trade for clients through an omnibus account in Korea, and the reporting rules for those accounts were eased in December 2023. Whether your broker offers KRX stocks is up to the broker, so ask before assuming it does.

Quick Summary

Item	Detail
Korean ISA eligibility	Korean tax residents only — nationality is not the deciding factor
Why most Japan-based expats don’t qualify	No domicile or 183+ days in Korea, no ongoing life-base there
Direct KRX access	No prior registration since Dec 2023; individuals use their passport number
Simplest alternative	Overseas-listed Korea ETFs (e.g. EWY, tracking MSCI Korea 25/50)

This article is for general informational purposes only and does not replace individual tax or investment advice. Residency determinations and account eligibility depend on your specific circumstances — always confirm current rules with a licensed financial or tax advisor before acting.