During a National Assembly forum held on Tuesday, South Korea put forward a plan to impose taxes on unrealized gains from stocks and equities. The announcement set off a dramatic selloff in the Korean stock market, with local traders quickly labeling the day “Black Tuesday.”
The proposal would require investors to pay taxes on paper profits they haven’t actually collected through a sale, fundamentally reshaping how wealth is taxed in Asia’s fourth-largest economy.
What South Korea’s New Tax Proposal Says
An unrealized gain refers to the paper profit an investor carries on an asset before actually selling it and converting that value into cash. South Korea’s new initiative would classify that paper profit as taxable income, even if the stock or property in question has never been traded.
The forum united a broad coalition of supporters. Legislators from the Democratic Party, the Progressive Party, the Rebuilding Korea Party, and the Social Democratic Party all endorsed the effort.
In addition, civic organizations such as the Korean Confederation of Trade Unions and the Federation of Korean Trade Unions threw their weight behind the push.
The forum’s title made the intent clear. Organizers billed it as “Exploring the Tax Gap on Asset Income and a Transition to Comprehensive Income Taxation.” The core argument is straightforward: growing wealth indicates a growing ability to contribute, irrespective of whether assets have been liquidated.
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This proposal represents the latest move in a wider legislative campaign. Back in February, lawmakers considered reducing the real estate capital gains exemption from ₩1.2 billion to ₩800 million (~$780,000 to $520,000).
Then in April, a separate effort targeted the long-term holding tax deduction available to property owners.
“We should bring back the financial investment income tax, scale back tax exemptions and deductions that disproportionately benefit high-income earners, and introduce additional brackets to lift the effective tax rate on the ultra-wealthy,” said Park Ki-san, director at the Federation of Korean Trade Unions.
Tuesday marked the first time the campaign has directly targeted unrealized stock market gains.
Under existing law, investors are only taxed when they sell shares and realize a profit. The proposed change would bring a sweeping overhaul to taxation across all major Korean asset classes.
The broader political backdrop is significant. In September 2025, President Lee Jae Myung walked back a prior proposal to lower the capital gains tax threshold from ₩5 billion to ₩1 billion (~$3.26 million to $652,000) after a fierce retail-investor backlash wiped out billions in market value in just one trading week.
Why the Proposal Triggered a Korean Black Tuesday
The market’s response was swift and punishing. Traders wasted no time branding June 23 as Black Tuesday for Korean stocks, with major companies on the KOSPI and the broader index suffering steep drops. Retail investor sentiment turned sharply bearish within hours of the forum’s conclusion.
The concern among investors runs deep. Taxing unrealized gains would compel shareholders to sell holdings simply to cover an annual tax bill.
Beyond that, the policy could discourage long-term investment strategies, weaken retirement accounts, and push capital toward overseas equity markets throughout Asia.
Internationally, a precedent already exists. On February 12, 2026, the Netherlands enacted a comparable law, applying a flat 36% annual tax on unrealized gains across stocks, bonds, and crypto assets. The Dutch market and startup ecosystem felt the repercussions almost immediately.
Critics are already citing the Dutch experience. They contend that the Netherlands demonstrates how an aggressive unrealized gains tax can stifle innovation, push talent overseas, and strain household finances.
As a result, opposition lawmakers are expected to intensify their pushback in the weeks ahead.
Proponents, however, frame the policy as a matter of equity. They argue that wealthy asset holders possess a substantial capacity to pay well before any sale takes place, while salaried workers are taxed on every paycheck. Civic organizations maintain that closing this gap is critical for building a modern income tax system.
The road ahead remains unclear. Any formal legislation would still need to pass through the National Assembly, where political parties remain sharply divided on the issue.
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