Korea's Dividend Separate Taxation: The 22% Break-Even

Korea's new separate taxation option for dividend income runs 14% up to 20 million won, 20% up to 300 million, 25% up to 5 billion, and 30% above that. A local income tax equal to 10% of the tax amount is charged on top, so the effective rates are 15.4%, 22.0%, 27.5% and 33.0%. Those are the figures under the 2026 amended tax law, as summarized by KB's Thinking.

Compared with the 45% top marginal rate under global (aggregate) taxation — 49.5% including local tax — the maximum saving is 16.5 percentage points. But it is not automatic. You must elect separate taxation when filing your global income tax return, and electing it forfeits the dividend tax credit. For investors with modest dividends, the election can actually increase the bill.

Only cash dividends from listed firms paying out 40% or more

This provision, added to the Restriction of Special Taxation Act, does not apply to every dividend. Dawon Tax Accounting lists three conditions. The company must be a domestic corporation listed on KOSPI or KOSDAQ; its dividend payout ratio must be 40% or higher; and the dividend must be cash, received through direct share ownership.

The third condition trips people up most often. Distributions received through ETFs, funds or REITs are excluded. The same underlying dividend can be taxed differently depending on whether you held the stock directly or through a product. REITs have their own 9% separate taxation regime, judged under separate conditions.

The rules apply to dividends paid on or after 1 January 2026. As Toss Bank noted, the start date and top rate were contested while the bill was still a government proposal; the final version cut the top rate from 35% to 30%, Joseilbo reported. It is a temporary measure running through 2028.

Add local income tax and the break-even appears

The published rate table is national tax only. To compare what actually leaves your account, add the 10% local income tax surcharge and place the result next to your marginal rate under aggregate taxation. The table below adds that surcharge to each bracket.

The top row shows 0.0 percentage points for a simple reason. Financial income of 20 million won or less a year is already settled by 14% withholding (15.4% with local tax). For anyone in that band, the new regime changes nothing. The threshold sits at the same line as the 20-million-won trigger for global taxation of financial income.

If your marginal rate is under 22.0%, you lose

The fourth column above assumes an extreme case: other income above 1 billion won. Most people sit well below that, which is why the benchmark should be your own marginal rate, not the statutory maximum. For someone whose dividends exceed 20 million won and fall into the 20% band, electing in makes no sense if their marginal rate is below the 22.0% effective figure.

Adding local income tax to Korea's basic income tax brackets shows exactly where that line falls.

The boundary is a taxable income of 50 million won. Below it, electing separate taxation converts a 16.5% bill into a 22.0% one. On dividends of 30 million won, the 10 million above the threshold would be taxed 5.5 percentage points higher — an extra 550,000 won. The election starts paying off above 50 million won, and the gap only becomes meaningful past 88 million, where the marginal rate reaches 38.5%.

Separate taxation is an option, not a gift. If your marginal rate does not clear 22.0%, electing it raises your tax.

Two more variables: the tax credit and health insurance

Two factors keep the comparison from ending at rates. The first is the dividend tax credit, which you give up by electing separate taxation. The lower your marginal rate, the more that credit is worth in relative terms, and the more aggregate taxation holds up. The break-even calculated above compares rates only, so the real boundary sits somewhat above 50 million won.

The second is national health insurance. Dawon Tax Accounting argues that the decision should weigh total income, tax credits and health insurance premiums together. For a regional subscriber, financial income feeds into the premium calculation, so tax saved can be partly offset by premiums added. Which effect dominates depends on your enrollment status and cannot be generalized.

The temporary nature of the measure is a variable in itself. A 40% payout ratio is not something a company is obliged to maintain. A firm that qualifies this year may not next year, and once it falls short, dividends from the same stock drop out of the regime.

What to watch

• Whether the 40% payout ratio holds — check cash dividends against net income each year in the annual report and dividend disclosures. Qualifying once does not mean qualifying always.
• How you hold it — distributions through ETFs, funds and REITs are excluded even for the same stock. Track directly held dividends separately from product-held ones.
• Your own taxable income — whether your non-dividend taxable income sits above or below 50 million won is the first test. It appears on your withholding statement.
• The filing step — nothing is automatic. The election must be filed with your global income tax return, and reversing the choice afterwards is difficult.
• Your health insurance category — employee and regional subscribers are affected differently. Put the tax saved and the premium added in the same table.
• After 2028 — no extension has been decided. Anchoring a long-term dividend plan to these rates leaves the premise exposed when the measure lapses.

Sources

• A walk through the 2026 tax law changes — KB's Thinking
• Top separate-taxation rate on dividends cut from 35% to 30%, effective next year — Joseilbo
• 2026 dividend separate taxation guide: rates, conditions, strategy — Dawon Tax Accounting
• Dividend separate taxation, from definition to the reform bill — Toss Bank