[In-Depth Analysis] The Unending Financial Investment Income Tax Debate: Tax Reform Issues Reignited Amidst Sluggish Stock Market

Introduction

As of July 1, 2026, one of the most hotly debated topics surrounding the stock market is undoubtedly the controversy over the Financial Investment Income Tax. The tax, which was legally abolished at the end of 2024 through a plenary session of the National Assembly, has recently come under scrutiny again, coinciding with the prolonged sluggishness of the domestic stock market. Caught between the firm principle of tax equity and the practical, urgent goal of vitalizing the capital market, investors' anxiety and policy uncertainty are mounting once again. At this juncture, we provide an in-depth analysis of the structural causes behind this reignited controversy and its ripple effects on the market and investor sentiment.

Fundamental Background of the Reignited Controversy

1. The Unbridged Gap in Tax Equity

Even after the decision to abolish the tax, academia and civic groups have continuously pointed out that the fundamental tax principle of "tax where there is income" has been undermined. Recently, some political figures have strongly argued for the need to reform the taxation system on capital gains, citing the deepening polarization within the stock market. In particular, along with criticisms that benefits are concentrated among high-net-worth individuals, there is a growing voice that a reasonable taxation standard for financial income must be established in some form to protect retail investors and redistribute wealth. This is being treated not simply as a revival of a past system, but as part of a broader macroeconomic tax reform.

2. Range-Bound Domestic Market and Worsening Investor Sentiment

While the KOSPI index has recently shown a limited upward trend driven by large-cap stocks, the overall domestic stock market still fails to find clear momentum. In the KOSDAQ market, in particular, investment sentiment, largely centered on small and medium-sized caps, has extremely contracted due to spreading concerns over the mass delisting of marginal companies following stricter listing maintenance conditions. The tax-related controversy that erupted in this market environment acts as a factor maximizing investors' uncertainty. Many retail investors express concern that merely reopening a matter already settled by the legislature seriously damages market trust and will be a self-inflicted wound that deepens the "Korea Discount."

Current Status of Capital Gains Tax Policies in Major Countries

In the global financial market, major developed countries establish clear taxation principles for capital gains while simultaneously operating sophisticated deduction systems to induce market vitalization and long-term investment.

• United States: The US has a system that strictly classifies capital gains into short-term (1 year or less) and long-term (over 1 year) based on the holding period and applies differential tax rates. For long-term investments, preferential tax rates of 0%, 15%, or a maximum of 20% are applied depending on the taxpayer's income level, thereby reducing market volatility and strongly encouraging long-term holding by investors.
• Japan: Japan applies a single separate taxation rate of 20.315% (15.315% income tax, 5% resident tax) to capital gains and dividend income from listed stocks. Concurrently, by significantly expanding the annual investment limit and tax-free period of the new NISA (Nippon Individual Savings Account), the government actively supports citizens' asset accumulation under the national slogan of "from savings to investment."
• United Kingdom: The UK levies a Capital Gains Tax (CGT) but provides an Annual Exempt Amount each year. Furthermore, it offers full tax exemption on investment returns through ISAs (Individual Savings Accounts), significantly easing the tax burden on retail investors.

These global examples suggest that rather than merely focusing on securing tax revenue, it is essential to have carefully designed policy arrangements that can build the physical strength of the capital market and elicit voluntary participation from investors.

Future Policy Direction and Investor Response Strategies

Currently, the government and financial authorities are maintaining a cautious stance, stating that they have no immediate plans to reintroduce the tax or drastically change the existing capital gains tax system, fearing market confusion. Amidst lingering external uncertainties such as fading expectations of interest rate cuts and global geopolitical tensions, a hasty tax reform carries a high risk of accelerating a massive exodus of domestic capital overseas.

During these times of uncertainty, it is paramount for investors to adhere to an orthodox long-term investment perspective based on intrinsic corporate value and earnings fundamentals, rather than reacting emotionally to short-term policy volatility. Moreover, in preparation for the possibility that mid- to long-term tax reform discussions may surface in the future, investors should proactively build strategies to defend the after-tax return of their portfolios by maximizing the contribution limits of legal tax-saving accounts currently available, such as ISAs and pension savings funds.