Same Index, Different Tax Bill: Two Ways to Buy the S&P 500 from Korea
If you live in Korea and want to own the S&P 500, you have two routes. You can buy a Korea-listed ETF that tracks it, in won, from a domestic app, during Korean market hours. Or you can convert to dollars and buy the US-listed original.
Same index. Same underlying companies. Completely different tax treatment — and not in the way the headline rates suggest.
| Korea-listed foreign ETF | US-listed ETF | |
|---|---|---|
| Tax on gains | 15.4% (dividend income) | 22% (capital gains) |
| Classification | Trust-type fund | Stock |
| Annual exemption | None | ₩2.5M |
| Loss offsetting | Not available | Against other foreign stocks, same year |
| Global income tax | Included above ₩20M | Excluded (separate taxation) |
| Filing | Withheld at source | Self-reported each May |
| Tax-advantaged accounts | ISA, pension eligible | Not eligible |
The two systems
Under Korean tax law, a Korea-listed ETF isn’t a stock. It’s a trust-type fund. That single classification drives everything that follows.
Gains on a Korea-listed foreign ETF are treated as dividend income, taxed at 15.4%, withheld automatically. No filing required.
Gains on a US-listed ETF are treated as capital gains on a stock, taxed at 22%, self-reported every May — a filing I ended up doing by hand after missing the deadline.
At a glance, 15.4% beats 22% and the answer looks obvious. It isn’t.
Three things the rate doesn’t show
The ₩2.5 million exemption only exists on one side. Direct US holdings get an annual exemption before tax applies. Korea-listed ETFs get nothing — the first won of gain is taxed.
Losses only offset on one side. With direct US holdings, a loss on one position reduces the gain on another within the same calendar year. Korea-listed ETFs can’t be offset against anything, not against other funds and not against your direct holdings. A bad position and a good position are taxed as if the bad one never happened.
Only one side stays out of the progressive system. Capital gains on foreign stocks are taxed separately and never join your other income. Dividend income does — if your combined interest and dividend income passes ₩20 million in a year, you enter progressive taxation, and the effective rate on that money can go well above 22%. The 15.4% is a floor, not a ceiling.
Where the lines cross
Ignore the complications for a moment and just compare the two rates against the exemption.
At a gain of G won: direct investment costs (G − 2,500,000) × 22%. The Korea-listed ETF costs G × 15.4%.
Those meet at roughly ₩8.3 million, about $6,000.
Below that, direct US investment is cheaper — the exemption matters more than the rate. Above it, the lower rate starts to win, until the progressive threshold and the offset rules pull it back the other way.
For a lot of ordinary investors realizing modest gains, the “higher” 22% is the smaller bill.
What the local ETF actually wins on
Not the rate. Two other things.
No filing. Tax is withheld. There is no May, no spreadsheet, no self-calculated penalty for getting the date wrong.
Tax-advantaged accounts. This is the real one. Korea-listed ETFs can be held inside ISA and pension accounts, where gains are deferred and eventually taxed at a much lower rate on withdrawal. US-listed ETFs cannot go in those accounts at all. For long-horizon retirement money, this advantage is large enough that the comparison above stops being the relevant question.
That deserves its own post.
One more asymmetry
There’s a detail that surprised me. For Korea-listed ETFs, the taxable amount isn’t simply your gain — it’s the smaller of your actual gain and the change in the fund’s official tax base price. In practice the two are usually close. But they aren’t the same number, and the one that goes on your tax bill isn’t the one in your brokerage app.
Why I skip the account that would save me the most
I use a pension account, and Korea-listed ETFs inside it, because the year-end tax deduction is a certain, immediate return. But I don’t fill it to the limit. Money in there is locked until retirement, and I’m not willing to commit that much.
I don’t use ISA at all, which surprises people given how the tax math looks. Three reasons, none of them about the tax rate.
I don’t trade much. Tax deferral compounds when you realize gains often. If you buy and hold, there’s very little tax being deferred in the first place — most years, nothing is realized at all. The benefit that ISA advertises is a benefit for someone with a higher turnover than mine.
I don’t trust the expense ratios to stay where they are. Korea-listed ETFs are cheap right now. US ETFs have decades of history at low cost; the Korean products have a shorter record, and “cheap today” and “cheap for twenty years” are different claims. I’d rather pay a known cost.
The maturity reset costs more than it looks. An ISA has to be closed and reopened every few years. That means selling everything and buying it back — trading costs on both sides, and no guarantee you get back in at the price you sold. On a long horizon this friction isn’t small, and it doesn’t appear in any of the comparison tables.
So in practice: pension account holds Korea-listed ETFs, everything else is direct US holdings. Not because I ran the numbers and 22% won, but because the account that makes 15.4% attractive comes with strings I don’t want.
And the friction is about to become mandatory
In August 2026 the government published its tax reform proposal for the year, and ISA is one of the targets.
Under the current rules, you clear the three-year minimum and then extend the contract indefinitely. The proposal caps the total contract at five years — three years minimum plus a two-year extension, and then it ends. The stated reasoning is that indefinite deferral was an excessive benefit.
The carry-forward of unused annual contribution room would also be abolished. The ₩20 million annual cap and ₩100 million lifetime cap stay as they are.
There’s a new account alongside it, aimed at domestic investment, with a much larger allowance and full exemption on interest and dividend income. It only holds Korean assets. If you’re buying a US index, it isn’t available to you — a point that has drawn criticism in the National Assembly.
None of this is law yet. It’s a government proposal, and it goes through legislative notice, cabinet, and parliamentary review before anything is final. The content can change.
But if it passes as written, the thing I listed above as a personal reason to avoid ISA — having to liquidate and re-enter every few years — stops being a choice and becomes the design.
So which one
There isn’t one answer, which is the honest version.
If your realized gains are modest and you’re comfortable filing in May, direct investment is usually cheaper. If you’re realizing large gains and already have meaningful dividend income, check where you sit against the ₩20 million line before deciding anything. And if the tax-advantaged accounts fit how you actually invest, they beat both of the options I’ve compared here.
The mistake worth avoiding is treating the two as the same fund with one being easier to buy. They’re taxed under different systems, and which system you’re in changes more than the rate does.
Figures are as of 2026. Korean tax rules change, sometimes yearly. This is my own experience as an individual investor, not tax advice.