South Korea proposed a tax on unrealized gains in stocks and real estate during a National Assembly forum on Tuesday. The push has sparked what local traders are already calling “Black Tuesday” across the entire Korean stock market.
The proposal would tax investors on paper profits they never made through selling, redefining how wealth is handled in Asia’s fourth-largest economy.
What South Korea’s new tax proposal says
Unrealized gain is the profit an investor retains on paper before actually selling the asset and converting the value into cash. New South Korean batch You will treat this paper profit as taxable incomeeven if ownership of the underlying stock or property never changes hands.
The forum has brought together a strong coalition. Lawmakers from the Democratic Party, Progressive Party, Korea Reconstruction Party, and Social Democratic Party signed on.
Moreover, civic groups, including the Korea Federation of Trade Unions and the Korean Federation of Trade Unions, have joined these efforts.
The forum title clearly sets the tone. The organizers have titled the event “Exploring the Tax Gap on Asset Income and the Transition to Universal Income Tax.” This argument is based on a simple idea: higher wealth indicates higher ability to pay, regardless of whether assets are sold or not.
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The proposal is the latest step in a broader campaign. In February, Lawmakers proposed a cut Real estate capital gains exemption from 1.2 billion yen to 800 million yen (about $780,000 to $520,000).
Furthermore, the April payment targeted the long-term tenure deduction for property owners.
He added: “We must revive the financial investment income tax, reduce tax exemptions and deductions concentrated among high-income groups, and add nominal brackets to raise the effective tax rate for the very high-income group.” He said Park Ki-san, Director of the Korean Federation of Trade Unions.
Tuesday marks the first time the campaign has explicitly accessed unrealized stock gains.
Under current law, investors only bear taxes when they sell shares and realize a profit. The proposed shift would fundamentally redefine taxation across all major Korean asset classes.
The broader context matters. President Lee Jae-myung It canceled a previous plan in September 2025 To lower the capital gains tax threshold from 5 billion yen to 1 billion yen (about $3.26 million to $652,000) after a backlash from retail investors wiped billions off market value within a single trading week.
Why did the proposal spark Korean Black Tuesday?
The market reaction was immediate and brutal. Traders quickly dubbed June 23 “Black Tuesday” for Korean stocks. With major listings declining across the KOSPI index And the broader index. As a result, retail sentiment turned sharply negative within hours of the forum.
The fear among investors is structural. Taxing stock gains would force stockholders to sell shares simply to pay off an annuity obligation.
This policy may also undermine long-term investment, harm retirement portfolios, and accelerate the flight of capital towards offshore stock markets throughout Asia.
At the international level, there is now a clear precedent. The Netherlands issued a similar law On February 12, 2026, it imposed a flat 36% annual tax on unrealized gains across stocks, bonds and crypto assets. The Dutch backlash hit local markets and startups almost immediately.
Critics already Referring to the Dutch example. They argue that the Netherlands’ case shows how a system of unrealized gains can stifle innovation, push talent abroad, and squeeze household budgets.
As a result, opposition lawmakers are expected to mount resistance in the coming weeks.
Supporters position this policy as fairness. They claim that high net worth individuals have enormous capacity to pay long before they sell, while wage earners pay a tax on every paycheck. Civic groups insist that closing the gap is essential to a modern income tax structure.
The way forward remains uncertain. Any actual legislation must still receive approval from the National Assembly, where parties remain divided.
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