Two ETFs can track the same index and still be taxed under completely different regimes in Korea. A fund listed on the Korea Exchange has its trading gains taxed as dividend income at 15.4%; the same exposure bought on a US exchange is taxed as capital gains at 22%. The lower rate looks like the obvious winner, but the amount you actually pay depends on the size of your annual gain. Once the 2.5 million won basic deduction is added to the equation, the two taxes converge at roughly 8.33 million won. Below that line the US-listed fund costs less; from there up to 20 million won the Korea-listed one does. And the moment losses enter the picture, the ordering breaks down again.
If 15.4% Is Lower, Why Does It Flip?
The split starts with classification. An ETF listed on the Korea Exchange is treated as a trust-type fund under Korean tax law, so its trading gains count as dividend income even when the fund holds only foreign stocks. An ETF listed abroad is treated like a foreign stock, so its gains are capital gains. KB Kookmin Bank's ETF tax comparison puts the trading-gain rate for Korea-listed foreign equity ETFs at 15.4% dividend tax and foreign-listed ETFs at 22% capital gains tax, and states plainly that the Korea-listed version gets neither loss offsetting nor a basic deduction.
Capital gains treatment comes with two cushions: an annual basic deduction of 2.5 million won, and loss offsetting that nets all trades in the same calendar year. Toss Bank's guide sets the rate at 22% (20% national plus 2% local), the deduction at 2.5 million won per year, and the filing window in May of the following year for the prior January–December trades. Dividend treatment has neither cushion — 15.4% is withheld on every profitable sale as it happens.
That makes the break-even a one-line equation. Call the annual gain G. The Korea-listed fund pays 0.154G; the foreign-listed fund pays 0.22 × (G − 2.5 million). Setting them equal gives 0.066G = 550,000 won, so G is about 8.33 million won.
| Annual trading gain | Korea-listed foreign ETF (15.4%) | Foreign-listed ETF (22%, 2.5M deduction) | Difference |
|---|---|---|---|
| 3,000,000 won | 462,000 won | 110,000 won | Korea-listed pays 352,000 more |
| 5,000,000 won | 770,000 won | 550,000 won | Korea-listed pays 220,000 more |
| 8,330,000 won | 1,283,000 won | 1,283,000 won | Even |
| 10,000,000 won | 1,540,000 won | 1,650,000 won | Foreign-listed pays 110,000 more |
| 20,000,000 won | 3,080,000 won | 3,850,000 won | Foreign-listed pays 770,000 more |
The 3–5 million won band is the striking part. Despite a rate that is 6.6 percentage points lower, the Korea-listed route costs three to four times as much. At small gains, the 2.5 million won deduction swallows the rate gap whole. For an account in its first few years, picking by the headline rate produces exactly the wrong answer.
Losses Widen the Gap
Real accounts hold winners and losers together, and that is where the two regimes diverge most. Suppose two ETFs are closed out in the same year: one up 10 million won, the other down 6 million won.
| Step | Korea-listed foreign ETF | Foreign-listed ETF |
|---|---|---|
| Gain on winner | +10,000,000 won | +10,000,000 won |
| Loss on loser | −6,000,000 won | −6,000,000 won |
| Income after offsetting | 10,000,000 won (loss ignored) | 4,000,000 won |
| Basic deduction | None | 2,500,000 won |
| Taxable base | 10,000,000 won | 1,500,000 won |
| Rate | 15.4% | 22% |
| Tax | 1,540,000 won | 330,000 won |
| Effective rate on 4M net gain | 38.5% | 8.25% |
The gap is 1.21 million won in tax and over 30 percentage points in effective rate. Realizing a loss in the same year does nothing for the Korea-listed holder, because withholding on the winning trade already happened. The familiar year-end tax-loss harvesting move simply does not exist on that side of the line.
The rate table says 15.4% versus 22%, but the money that actually leaves your account is decided by deductions and loss offsetting. Paying 1.54 million won on a 4 million won net gain is an effective rate of 38.5%.
Above 20 Million Won, It Flips Back
Dividend income has a ceiling too. Once interest plus dividends exceed 20 million won in a year, the excess is rolled into comprehensive income taxation at progressive rates. Trading gains on Korea-listed foreign ETFs are dividend income, so they count toward that threshold. Sisa Journal-e described the structure — 15.4% with no offsetting and no deduction — and noted that combined interest and dividend income above 20 million won triggers comprehensive taxation.
Foreign-listed ETF gains are capital gains, taxed separately and finally. No matter how large, they are never aggregated with other income, and the flat 22% holds. The result is a three-stage ordering: below 8.33 million won the foreign-listed fund wins, from there to 20 million won the Korea-listed one does, and past 20 million won of total financial income the foreign-listed fund wins again. Note that the threshold test sweeps in deposit interest and domestic dividends too, not just ETF gains.
Tax-Advantaged Accounts Rewrite the Equation
Everything above assumes an ordinary brokerage account. Inside an ISA, the coefficients change. Sisa Journal-e lists the brokerage-type ISA terms as a three-year minimum holding period, 2 million won of tax-free gains (4 million won for the qualified lower-income tier), 9.9% separate taxation on the excess, and exclusion from comprehensive income taxation. Holding a Korea-listed foreign ETF inside an ISA removes both of its weaknesses at once.
The catch is eligibility: ISAs and pension accounts can only hold products listed on a Korean exchange, so foreign-listed ETFs are out of scope entirely. The 8.33 million won break-even therefore applies only inside a standard account; within the annual contribution room of a tax-advantaged account, the math leans toward the Korea-listed product.
What to Watch
- Total realized gains for the year — above or below 8.33 million won decides the ordering
- Unrealized losses in the same account — whether offsetting applies changes any year-end strategy
- Total annual financial income including deposit interest and domestic dividends — the 20 million won test aggregates beyond ETFs
- Remaining contribution room in ISA and pension accounts — different math inside those limits
- Settlement date rather than trade date — a late-December sale can land in the following tax year
- Pending tax law changes — the break-even shifts whenever the rate or deduction moves