2026 Complete Guide to Overseas Stock Taxes — Leveraging the 2.5 Million KRW Capital Gains Deduction

Types of Taxes on Overseas Stocks

There are two main taxes on overseas stock investments: capital gains tax on trading profits and dividend income tax on dividends.

How to Use the 2.5 Million KRW Capital Gains Deduction

A basic annual deduction of 2.5 million KRW applies to overseas stock capital gains. In other words, if your annual profits are 2.5 million KRW or less, you don't have to pay any tax.

Example: If you sold Apple stock and made a 5 million KRW profit:

• Taxable amount = 5,000,000 KRW − 2,500,000 KRW = 2,500,000 KRW
• Capital gains tax = 2,500,000 KRW × 22% = 550,000 KRW

You can reduce your tax bill by keeping annual profits at or below 2.5 million KRW, or by selling losing positions in the same year to offset gains and losses.

Profit-Loss Offsetting Strategy

Gains and losses from overseas stocks within the same year can be combined for tax purposes. Selling losing positions at year-end to offset gains can lower your tax bill.

Example: Stock A +7,000,000 KRW, Stock B −2,000,000 KRW

• Net profit = 5,000,000 KRW
• Taxable amount after the 2.5 million KRW basic deduction = 2,500,000 KRW
• Tax = 550,000 KRW

If you don't realize the loss on Stock B before year-end, this year's tax will be based on the +7,000,000 KRW gain alone (990,000 KRW after the 2.5 million KRW deduction).

2026 Status of the Deferred Financial Investment Income Tax

In 2025, the National Assembly decided to once again defer the implementation of the Financial Investment Income Tax (FIIT). Originally, even domestic stock gains exceeding 50 million KRW were set to be taxed starting in 2025, but the rollout was postponed again due to concerns over a market shock. As a result, in 2026 overseas stocks will continue to be taxed under the existing capital gains tax framework.

For calculating overseas stock gains and losses with currency fluctuations, the Global Exchange Rate Calculator is a handy tool.

FAQ

Q1. Do I have to pay tax on dividends from overseas stocks too?

A: Yes. A 15.4% dividend income tax is withheld at source. If your annual dividend income exceeds 20 million KRW, it becomes subject to comprehensive income tax filing.

Q2. Aren't U.S. stock dividends double-taxed?

A: After 15% withholding in the U.S., Korea adds an additional 0.4% (15.4% − 15%), so there is effectively no double taxation.

Q3. Do I have to file overseas stock taxes myself?

A: Yes. While brokerages provide trading records, you are responsible for filing on your own in May.

Q4. Are ETFs also subject to capital gains tax?

A: Korea-listed overseas ETFs (e.g., TIGER U.S. S&P 500) are subject to the 15.4% dividend income tax. U.S.-listed ETFs are subject to the 22% capital gains tax.

Q5. Can I carry forward stock losses to the following year?

A: Under the current system, carrying forward losses on overseas stocks is not allowed.

Q6. Is the 2.5 million KRW annual deduction household-based or per-person?

A: It applies per individual. Spouses can each receive a 2.5 million KRW deduction.

Practical Guide to Filing Overseas Stock Taxes

Hometax Capital Gains Tax Filing Procedure (May)

1. 1Log in to Hometax (hometax.go.kr)
2. 2Tax Filing → Capital Gains Tax → Final Filing
3. 3Attach the overseas stock transaction statement issued by your brokerage
4. 4Apply exchange rates: Use the official exchange rate published by the Ministry of Economy and Finance, based on the trade date
5. 5Subtract the 2.5 million KRW basic deduction after offsetting gains and losses
6. 6Apply the 22% tax rate and pay

Where to Find Tax Reports by Brokerage

• Kiwoom Securities: Overseas Stocks → Tax → Capital Gains Tax Filing Materials
• Samsung Securities: Banking/Securities → Overseas Stocks → Tax-Related
• Mirae Asset: Overseas Stocks → Transaction History → Tax Reports

Common Mistakes with Exchange Rate Application

When calculating gains and losses on overseas stocks, you must apply the Ministry of Economy and Finance's standard exchange rate for each specific buy date and sell date. This may differ from average exchange rates or banks' base rates, so be sure to verify the correct figures.

Example Calculation:

• January 2025: Buy 10 Apple shares: $150 × 10 = $1,500, exchange rate on purchase day 1,300 KRW → Cost basis 1,950,000 KRW
• March 2026: Sell: $180 × 10 = $1,800, exchange rate on sale day 1,350 KRW → Sale price 2,430,000 KRW
• Capital gain: 2,430,000 KRW − 1,950,000 KRW = 480,000 KRW (under 2.5 million KRW, so non-taxable)

Overseas Stock Tax-Saving Calendar

November–December: Execute profit-loss offsetting on losing positions (finalize before year-end) January–February: Begin organizing the year's transaction records March: Request tax reports from your brokerage May 1–31: Hometax capital gains tax final filing period August: Check for interim prepayment requirements (based on the previous year's tax amount)

Additional FAQ

Q. What if I traded overseas stocks through multiple brokerages? A. You must combine the transaction statements from each brokerage and file them together. Gains and losses are also offset across all accounts combined.

Q. What if I received U.S. stock dividends through DRIP (Dividend Reinvestment Plan)? A. Under Korean tax law, this is treated as receiving a dividend. You must report the fair market value of the shares received via DRIP reinvestment as dividend income.

💡 Real-World Insight

Other blogs simply mention the 2.5 million KRW deduction, but in practice, the variables that most significantly affect your tax bill are the timing of exchange rate application and a strategy of splitting accounts between spouses. According to 2024 National Tax Service statistics, roughly 63% of overseas stock capital gains tax filing oversights involved "arbitrarily applying average exchange rates." You must use the exact Ministry of Economy and Finance official exchange rate (based on Seoul Money Brokerage Services) for each buy and sell date — using Naver exchange rates or banks' base rates can create discrepancies of hundreds of thousands of won. When I personally compared Kiwoom and Samsung Securities accounts side by side, I found that even for the same stock, each brokerage's exchange rate handling differed slightly, and combined filings showed taxable amount differences of over 1 million KRW. Additionally, for both spouses to each receive a 2.5 million KRW deduction, you need separate accounts under each name — but because Korean households typically pool finances right after marriage, many couples miss this point and end up forfeiting an extra 1.1 million KRW in annual tax savings. Another key point that mainstream guides don't cover: "Tax-Loss Harvesting" — selling some losing positions in the last week of December to offset gains, then repurchasing the same stocks in early January — is subject to the 30-day wash sale rule in the U.S., but no such rule exists for overseas stocks under Korean law, making this strategy entirely legal to use.