How to Read Korea’s Buyback Tax Proposal

Key Takeaways

• On August 3, 2026, Korea’s Ministry of Finance and Economy published the 2026 tax reform plan. It runs to 11 bills. Public comment ran from August 4 to August 20, 2026; the State Council takes it up on September 1, and it goes to the National Assembly before September 3, 2026.
• One provision rewrites how a buyback is taxed. From January 1, 2027, when a Korean company acquires its own shares from a shareholder, the amount that shareholder receives above the acquisition cost of those shares would be a deemed dividend. The company’s reason for buying stops mattering.
• Purchases made through the exchange or through an alternative trading system are carved out of the charge. After-hours block trades and large-lot or basket trades are carved back in.
• For a non-resident, the character of a payment decides the tax. A gain on Korean shares is often exempt under a treaty. A dividend is not exempt under a treaty — it’s capped, commonly at 15%.
• Shares acquired on or before December 31, 2026, stay under the old rules. That line sits inside the calendar of every buyback program still open.
• None of this is law. It’s a draft bill, and Korean tax bills change between August and December.

Contents

1. What happened
2. Why it didn’t travel
3. What it means for a foreign investor
4. What to watch
5. FAQ

1. What happened

Korea’s Ministry of Finance and Economy published the 2026 tax reform plan on August 3, 2026 (Ministry of Finance and Economy, 2026 tax reform plan announcement, August 3, 2026). Eleven bills. Public comment ran from August 4 to August 20, 2026. The State Council reviews the package on September 1, and it reaches the regular session of the National Assembly before September 3, 2026.

The ministry’s own one-line summary of the item in question reads, in translation: the tax treatment of treasury shares is consolidated as a capital transaction—deemed dividend taxation on acquisition, no taxation on disposal.

Unpack the first half of that sentence, because it carries the whole story.

Under the proposal, a company that acquires its own shares from a shareholder creates a deemed dividend for that shareholder. The taxable amount is what the shareholder receives above the acquisition cost of the shares sold. The company’s purpose in buying becomes irrelevant. The taxable moment also moves: retirement of treasury shares comes out of the deemed-dividend rule, and acquisition goes in.

Then come the exceptions, and they’re the part worth reading twice.

Acquisitions made through a securities market opened by the exchange or by an alternative trading system sit outside the charge. That’s the ordinary open-market buyback, the kind announced by press release and executed over weeks on the order book.

But after-hours block trades and large-lot or basket trades are inside it. Those execute through exchange facilities, and they’re still treated as the negotiated transactions they are.

The measure applies to treasury shares acquired on or after January 1, 2027. Shares acquired on or before December 31, 2026, remain under the previous rules.

The reason the ministry gives is alignment with company law. The amended Commercial Act, Law No. 21448, was promulgated and took effect on March 6, 2026, making cancellation of acquired treasury shares the default rather than one option among several (Lawtimes, Yulchon client note on the amended Commercial Act). If most buybacks end in cancellation anyway, then taxing at the moment of purchase is the tidier design.

It also ends a long-running argument. Korean law has drawn the line by asking what the company intended: a buyback for retirement produced dividend income for the selling shareholder, and a buyback for another purpose produced a capital gain. Courts settled disputes by examining the substance of each transaction rather than the label on the contract, and a 2025 decision held that where no retirement purpose existed at acquisition, a later cancellation could not be taxed as a dividend against the shareholder who had sold (Joseilbo, July 2, 2025). The proposal doesn’t answer that question. It deletes it.

Why any of this got large enough to matter is a separate story, told in How to Read a Korean Value-Up Disclosure. Korean buybacks stopped being rare.

2. Why it didn’t travel

The 2026 tax plan wasn’t ignored in English. It was covered, and covered competently, by other items.

The Korea Times reported the stock-price-suppression valuation rule and the roughly 200 listed companies it could reach (August 4, 2026). Seoul Economic Daily’s English edition covered the domestic-production credit and the estate premium for suppression firms (August 3, 2026) and then the new savings account that blocks tax breaks on US-tracking exchange-traded funds (August 4, 2026). Korea JoongAng Daily covered the property and capital-gains backlash.

The company-law half of the treasury-share story also traveled. KED Global reported the mandatory-cancellation bill on July 11, 2025, framed as governance and shareholder returns. That article contains no tax content at all, which is fair enough — the tax measure didn’t exist yet.

What we searched for and didn’t find in the English-language press was the tax half: the recharacterization of buyback proceeds as a deemed dividend, its January 1, 2027 start date, the exchange and alternative-trading-system carve-out, the block-trade carve-back, or any statement about what it does to a non-resident shareholder.

In Korean, it was published the same week. Samil’s PwC’s tax flash carried the ministry’s current-versus-proposed table on August 3, 2026. The law firm Lee & Ko set out the same provision in Lawtimes on August 10, 2026, including the phrase that the acquisition purpose no longer matters.

There’s a structural reason for the gap, and it’s worth naming. A tax package is defined by its headline items—the ones with a constituency that complains. Treasury-share recharacterization has no retail constituency in Korea, because a Korean resident selling on the market isn’t touched by it either. It reads as plumbing, and plumbing doesn’t make headlines. The consequence for foreign shareholders isn’t written anywhere in the bill, so it surfaces only if somebody traces the definitions.

One more thing belongs here, because it cost us an hour. At least one English-language advisory page summarizes this provision backwards, saying that buybacks will be treated as capital transactions and therefore fall outside deemed-dividend taxation. The ministry’s table says the opposite. So does Lee & Ko. If you search this topic in English, you’ll likely meet that summary before you meet the provision.

3. What it means for a foreign investor

Start with what doesn’t change, because that covers most readers.

If you hold Korean listed shares and sell them on the exchange, nothing here reaches you. A non-resident who, together with related parties, held under 25% of the company during the year of sale and the five calendar years before it is exempt from Korean tax on that sale entirely. We set out that test in capital gains tax for foreign investors in Korea. Selling into a company’s open-market buyback is selling on the exchange, and the proposal carves those purchases out.

The change bites when a shareholder sells to the issuer, off the order book.

Under current law, that payment is a transfer of securities. Korea taxes a non-resident’s Korean-source transfer income by withholding the lower of 10% of the proceeds or 20% of the gain, with a 10% local surtax on top of the tax—11% or 22% in practice (National Tax Service, withholding on non-residents). And for many treaty residents, that domestic charge is switched off. Under the Korea–US treaty, gains on the sale of capital assets are taxable in the residence state, and share transfer gains are not among the listed exceptions.

Under the proposal, the same payment is a dividend.

Korea taxes Korean-source dividends paid to non-residents at 20%, plus the same 10% local surtax on the tax, so 22%. Treaties reduce it. The Korea–US ceiling is 15% for portfolio holdings and 10% where the recipient owns at least 10% of the payer and the payer’s interest and dividend income stayed under a quarter of gross income in the preceding year (PwC Worldwide Tax Summaries). The claim procedure, and the 2026 change that put the filing burden on the withholding agent, are in How to Cut Korea’s Dividend Withholding Tax to 15%.

Here’s the asymmetry that does the damage. A treaty gain article can exempt. A treaty dividend article only caps. Move a payment from the first category to the second, and a shareholder who owed nothing can owe 15%, without any rate in any treaty changing.

Now the honest part about how firm this reading is.

The bill says nothing about foreign investors. The route runs through definitions: Corporate Tax Act Article 93(2) fixes a foreign corporation’s Korean-source dividend income by reference to Income Tax Act Article 17(1), and Article 119(2) does the same for non-resident individuals. Article 17(1) is exactly what the proposal amends, so the new deemed dividend appears to flow through to non-residents by construction (Korea Law Information Center). The National Tax Service has already treated a deemed dividend from a capital reduction as Korean-source dividend income subject to a treaty limitation rate, which is the same characterization applied to an adjacent transaction.

That’s a reading of a draft, not a ruling on it. Treat it as a question to put to your own tax adviser before December, rather than as a settled position.

The block-trade point deserves its own line, because it’s the least intuitive part. The exception is written around the market, and after-hours block trading is a market facility. The drafters carved it back in anyway, which tells you the target is negotiated dealing with an identified counterparty rather than a particular venue. What that after-hours session is and who trades in it is covered in How to Read Korea’s After-Hours Trading Data.

4. What to watch

September 1 and September 3, 2026. The State Council reviews, then submits to the National Assembly. A provision can be dropped or rewritten at either point.

The autumn session. Korean tax bills are amended in committee before the December vote. The two details worth tracking are whether the block-trade carve-back survives and whether any language on non-residents appears. Silence on non-residents in the final text would leave the outcome to the definitions, which is where it sits in the draft.

January 1, 2027. If it passes as drafted, acquisitions from that date are inside the new rule. Acquisitions on or before December 31, 2026, are not.

Buyback announcements between August 21 and December 31, 2026. A transitional line creates an incentive to act before it. Whether Korean issuers actually pull purchases forward is a question about behavior, and we’ve found no data showing that they have. It’s worth watching rather than assuming.

Guidance from the National Tax Service. If the provision passes, the treatment of non-resident sellers is the kind of question that gets answered in a ruling rather than in the statute. That ruling, whenever it lands, is the document that settles what this article can only read for you.

5. FAQ

Is this a law?

No. It’s a draft bill published on August 3, 2026, out for comment until August 20, 2026, and headed to the National Assembly before September 3, 2026. Nothing’s settled until the Assembly votes.

If I sell Korean shares on the exchange, does this affect me?

No, acquisitions made through the exchange or an alternative trading system are carved out of the deemed-dividend charge, and a non-resident holding under 25% who sells on the exchange is outside Korean tax on that sale regardless.

What exactly is a deemed dividend here?

The amount a shareholder receives from the company for its own shares, above the acquisition cost of those shares. Under the proposal, it’s treated as a dividend rather than as proceeds of a sale.

Why does the character of the payment matter so much?

Because tax treaties treat the two differently. Many treaties, including the Korea–US treaty, leave share-transfer gains taxable only in the shareholder’s home country. No treaty exempts dividends; a dividend article sets a ceiling, commonly 15%.

Does it apply to shares a company already holds?

The transitional rule keeps treasury shares acquired on or before December 31, 2026, under the previous rules. The new charge attaches to acquisitions from January 1, 2027.

What happens on the company’s side?

Gains and losses on disposals of treasury shares would stop flowing through taxable income, which is the second half of consolidating the treatment as a capital transaction.

Where can I read the provision itself?

The ministry’s announcement page is linked in section 1, and it carries the detailed current-versus-proposed tables as attachments. They’re published in Korean only.

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Last updated: August 21, 2026

This article is for informational purposes only and does not constitute investment, tax, or legal advice. It describes a draft bill that has not been enacted and that may change before enactment. Tax outcomes for any particular holder depend on residence, treaty eligibility, ownership percentage, and how a transaction is executed. Consult a licensed professional before acting on any of it, and verify the provisions against the primary sources linked above.