The Real Cost of Owning Korean Stocks: Taxes and Fees Foreign Investors Pay in 2026

The cost most people miss: Korea taxes the sale, not the profit

Almost every guide to buying Korean stocks explains the brokerage side and stops there. The part that catches foreign investors off guard is simpler and harder to avoid: Korea levies a securities transaction tax on the value of every sale, whether the trade made money or lost it.

The rate went up this year. For share transfers made on or after January 1, 2026, the tax on listed shares traded on KOSPI and KOSDAQ rose from 0.15% to 0.20% of the sale proceeds, inclusive of the special tax for rural development. On KOSPI, that 0.20% is the sum of a 0.05% securities transaction tax — new in 2026, the first time the main board has carried one — and the 0.15% rural development levy that was already there. KOSDAQ reaches the same 0.20% through a single rate. KONEX stays at 0.1%, and unlisted shares are taxed at 0.35%.

The mechanics matter more than the number. The tax is charged on gross proceeds, not on gain, so a position you sell at a loss is still taxed. It is collected by your broker at settlement rather than billed to you later, which is why it tends to show up as an unexplained line item on a trade confirmation instead of a bill you can plan around.

Dividends: 22% by default, 15% if your treaty says so

Korea withholds tax on dividends at the moment they are paid. The statutory rate for non-residents is 20%, plus a local income surtax equal to 10% of that tax, which brings the all-in rate to 22%. Nothing is billed to you afterward — the money simply never arrives.

If you are resident in a country with a Korean tax treaty, you may be entitled to less. For U.S. residents, the standard treaty rate on portfolio dividends is 15%; a 10% rate exists but applies only in narrow ownership situations that retail investors will not meet. Treaty rates across Korea's network generally land between 5% and 15%, depending on the country and the size of the holding.

The treaty rate is not automatic. Your broker acts as withholding agent and has to hold documentation establishing where you are resident and that you are the beneficial owner of the dividend before it can apply the lower rate. And as of January 1, 2026, Korea tightened this: withholding agents must now file the treaty-rate application together with supporting evidence of substantive ownership with the competent tax office, by the end of February following the year the income was paid. In practice this means the paperwork your broker asks you for is no longer a formality it can quietly skip — if it is missing, you are taxed at 22%.

Capital gains: most foreign retail investors owe Korea nothing

This is the part that surprises people in the other direction. A non-resident who sells listed Korean shares at a profit is generally not subject to Korean capital gains tax at all, provided two conditions hold: the investor did not own 25% or more of the company's total issued shares at any point during the year of the sale or the preceding five years, and has no permanent establishment in Korea.

For anyone buying a few hundred shares of Samsung Electronics or SK Hynix, the 25% threshold is not a live concern. It exists to catch strategic and control-level stakes, not portfolios.

Where the exemption does not apply — and no treaty relief covers it — Korean tax is charged at the lower of 11% of the sale proceeds or 22% of the realized gain. It is also worth knowing what did not happen: the financial investment income tax (FIIT) that Korea had scheduled for 2025, which would have taxed retail investment gains broadly, was withdrawn before taking effect. The older regime described here is what remains in force.

Being exempt in Korea does not make the gain untaxed. Your own country almost certainly taxes it — U.S. investors report the sale on their own return exactly as they would a domestic one.

What the whole bill looks like on a real position

Taxes are only part of what separates the price on the screen from the money that reaches your account. The full stack, in the order you meet it:

First, the FX conversion. Dollars have to become won, and the spread your broker applies there is usually the largest single cost of a small Korean position — larger than the commission and often larger than the transaction tax. Second, the commission, which varies widely by broker and by whether you are routed through an integrated account. Third, the 0.20% transaction tax when you sell. Fourth, 15% to 22% withheld from any dividend along the way. And finally, conversion back to your home currency, where you pay the spread a second time.

None of these individually is large enough to change an investment case. Together, on a position held for a few months, they can consume a meaningful share of a modest gain — which is an argument for sizing positions so the fixed costs are not proportionally punishing, and for treating Korean equities as multi-year holdings rather than short-term trades.

Why Korean dividends themselves may be getting larger

One more 2026 change is worth understanding even though foreign investors cannot claim it directly. From January 1, 2026, Korea applies separate, lower taxation to dividend income that resident individuals receive from qualifying high-dividend listed companies — starting at 14% on the first ₩20 million and rising through higher brackets above that, in place of the ordinary progressive treatment. It runs through the fiscal year that includes December 31, 2028.

The qualification test is what makes it interesting: a company's dividend must not have fallen versus the FY2024 base year, and its payout ratio must be at least 40% — or at least 25% with a year-on-year increase of 10% or more. In other words, the tax break belongs to the shareholder but the behavior it is designed to change belongs to the company.

It appears to be working at the margin. Of the firms that announced dividends for 2025, 398 — about 44.8% — met the eligibility criteria, nearly double the 287 companies (24.2%) that would have qualified on FY2024 settlement terms.

A foreign holder is still taxed under the treaty rate, not this domestic schedule. But if a Korean company raises its payout ratio to keep its domestic shareholders inside the 14% bracket, the larger dividend reaches every holder on the register, wherever they live. That is the channel through which this reform matters to you.

Two things worth working through before you trade

Photo: FIN / Unsplash

Assume a U.S.-resident investor with treaty documentation on file, a position bought for ₩10,000,000 and sold twelve months later for ₩11,000,000, having collected ₩200,000 in dividends along the way.

Korean capital gains tax on the ₩1,000,000 profit: nothing, because the 25% ownership threshold is nowhere close. Securities transaction tax: 0.20% of the ₩11,000,000 sale value, or ₩22,000 — charged on the proceeds, not the gain. Dividend withholding at the 15% treaty rate: ₩30,000, leaving ₩170,000 of the ₩200,000 declared.

Korean tax on the round trip therefore comes to ₩52,000 against a ₩1,200,000 gross return — a little over 4% of it. Note what is not in that figure: the FX spread on the way in and out, and your broker's commission, neither of which is a tax and both of which are frequently larger.

Photo: Olena Kholina / Unsplash

The difference between 22% and 15% on every dividend you will ever receive from a Korean company comes down to whether a form reached the right desk in time. Since January 2026 the filing obligation on your broker is explicit and dated, which cuts both ways: it is harder for the step to be skipped, and easier for a missing document on your side to cost you the rate.

Three things are worth confirming with your broker before the first dividend rather than after it. Whether they hold current residency documentation for you. Whether they apply treaty rates at source, or withhold at 22% and leave you to reclaim the difference — a materially worse outcome, because reclaims are slow and some are never filed. And what they report to you at year end, since the foreign tax withheld is what supports a foreign tax credit claim at home.

For U.S. investors, tax actually withheld by Korea is generally creditable against U.S. tax on the same income, subject to the limitations of the foreign tax credit rules. That is the mechanism that keeps the dividend from being taxed twice — but it depends on the withholding being documented, which returns you to the paperwork.

Featured photo: Yohan Cho / Unsplash

The Korea investing series

Nine guides, in the order they build on each other.

• 01Getting accessHow foreigners can now buy Korean stocks directly
• 02Converting currencyThe FX math behind a won-denominated position
• 03Choosing a boardWhat KOSPI vs. KOSDAQ actually tells you
• 04What it costs — you are hereTaxes, transaction levies and the fees in between
• 05When you can tradeHours, price limits and the halts that stop them
• 06Doing the researchReading Korean filings in English on DART and KIND
• 07Reading the labelWhy MSCI still calls Korea an emerging market
• 08Knowing the exitsThe delisting rules that now catch small KOSDAQ names
• 09Passing it onWhat Korea taxes when a non-resident dies owning shares