"Black Tuesday" in South Korea: Tax on "paper" profits crashes markets
Today, June 23, 2026, the financial world of South Korea experienced a real shock, already dubbed "Black Tuesday." The reason for the market collapse was a sensational statement in the National Assembly: a group of influential lawmakers proposed introducing a tax on unrealized profits from stocks and real estate. In other words, citizens would have to pay the state even on income they have not yet received, but only "see" on paper.
The Essence of the New Tax Initiative
This concerns the taxation of so-called "virtual" or "paper" profits. This is net income arising from the increase in value of assets held in a portfolio but not yet sold. The authors of the bill insist that the mere fact of an increase in a citizen's wealth is sufficient grounds for levying a tax. The actual sale of the asset and receipt of real cash are not required for this.
Behind this initiative is a powerful coalition uniting representatives of the Democratic, Progressive, and Social Democratic parties, as well as the "Rebuilding Korea" movement. Major public forces, particularly the Federation of Korean Trade Unions, quickly joined the discussion.
This proposal is a logical continuation of a broader tax reform. Recall that back in February, lawmakers proposed reducing the tax-exempt amount on real estate sales, and in April, cutting benefits for long-term investors.
"It is necessary to reinstate the tax on financial investment income, reduce benefits and deductions concentrated among the wealthiest, and introduce additional categories for super-high incomes," emphasized Park Ki-sang, director of the Federation of Korean Trade Unions.
For the first time in the country's history, officials have spoken about a fiscal burden specifically on unrealized income from securities. The current system taxes profits only after the portfolio is sold. The new rules completely dismantle the familiar financial paradigm.
Reasons for the Korean "Black Tuesday"
The market reaction was immediate and extremely painful. Within just a couple of hours, the quotes of leading enterprises on the KOSPI stock exchange collapsed. Panic gripped all individual investors. People are frightened by the absurdity of the upcoming rules: investors will be forced to sell off their own shares to find cash to annually pay tax on fictional income.
Such steps will ultimately kill long-term investments, deal a devastating blow to pension savings, and provoke a massive flight of capital to other Asian jurisdictions. There are already precedents in the world: on February 12, 2026, the Netherlands passed a similar law — a fixed 36% annual tax on unrealized profits from stocks, bonds, and crypto assets. The reaction was immediate: local markets and startups began losing ground right after the law was passed.
Skeptics already cite the experience of the Netherlands. They believe such a tax regime stifles innovation, pushes talented specialists abroad, and increases pressure on the budgets of ordinary families. The opposition in parliament promises to intensify resistance in the coming weeks.
Supporters of the initiative, however, call it fair. In their view, owners of large assets can afford to pay the tax in advance, while ordinary workers pay from every paycheck. Civil organizations are convinced that narrowing the gap between these groups is a necessary step for forming a modern tax system.
Analyst's Opinion: The initiative of Korean lawmakers is a dangerous precedent that could lead to a stock market crash and massive capital outflow. A tax on "paper" profits is a direct path to liquidating the middle class of investors and destroying the long-term investment climate in the country. The markets have already delivered their verdict, and it is extremely negative.