The Tax Break Nobody Outside Seoul Is Really Using
South Korea’s long-term holding special deduction — jangteuk gongje (장기보유특별공제) in Korean — is supposed to reward homeowners who hold property for years. In principle it applies nationwide. In practice, it is one of the most geographically concentrated tax reliefs in the Korean fiscal system.
In 2024, the total long-term holding deduction claimed on high-value residential property amounted to 863.8 billion won (roughly US $630 million). Seoul alone absorbed 782.3 billion won — 90.6% of the entire national total.1 Add in the broader Seoul Capital Region (Gyeonggi Province and Incheon), and the share jumps to 98.0%. Busan, South Korea’s second-largest city, accounted for a mere 18.2 billion won — 2.3% of what Seoul claimed.
That concentration is not an accident. It is baked into the structure of the deduction itself. And that structure is now at the center of the most consequential housing tax debate since 2018.
How the Deduction Works — and Why It Favors Expensive Homes
Under current law, a single-homeowner household selling a property with a transaction price above 1.2 billion won (approximately US $880,000) can claim the deduction in two separate streams:
- Holding-period deduction: 4% per year of ownership, up to 10 years, for a maximum of 40% off capital gains.
- Residency-period deduction: an identical 4% per year of residence, again capped at 40%.
Combined, a homeowner who has both owned and lived in a property for a decade or more can shield up to 80% of capital gains from tax. Below the 1.2 billion won threshold, a single-household owner pays no capital gains tax at all — so the deduction is simply irrelevant for the vast majority of provincial homeowners.
The math is brutally simple: the larger the capital gain, the more valuable an 80% deduction becomes. An apartment in Gangnam bought for 500 million won in the 1990s and now valued at 3 billion won carries an unrealized gain of 2.5 billion won. An 80% deduction on that gain is worth roughly 700–800 million won in tax savings, depending on the applicable rate. No property in Daejeon or Jeonju comes close to generating numbers like that.
Data from the Narasallim Research Institute (April 2026) found that 52.3% of the entire 5 trillion won in long-term holding deductions nationally flows to owners who have held their properties for 20 years or longer.2 Properties valued above 3 billion won absorb 44% of total deductions.3
Citizens’ Coalition for Economic Justice (경실련) put concrete numbers to this distortion. In their March 2026 analysis, a seller of an Apgujeong Hyundai 3rd Complex apartment in Gangnam faced an effective tax burden of just 7% after applying the long-term deduction — while a gap-investment seller of a regional property paid 790 million won in taxes.4 Same tax code, radically different outcomes.
Two Reform Proposals on the Table
Two distinct legislative proposals are currently before the National Assembly. Neither has been passed into law. The direction the government takes — or whether it finds a middle ground — will determine who actually gets hurt.
| Category | Current Law | Proposal A (Residency-Based) |
Proposal B (Lifetime Cap) |
|---|---|---|---|
| Structure | Holding deduction (max 40%) + Residency deduction (max 40%) = max 80% | Holding deduction eliminated; residency only at 8% per year | 80% rate deduction abolished; replaced by a lifetime tax credit cap of 200 million won |
| Core shift | — | Non-resident long-term holders lose all benefit | Owners with massive gains hit a hard ceiling |
| Proposed by | — | National Assembly (April 2026) | Rep. Yun Jong-o, Progressive Party |
| Who loses most | — | Long-term non-resident owners of Seoul high-value homes | Ultra-high-gain sellers (gains in the billions of won) |
| Owner-occupiers | — | Likely neutral to mildly favorable | Neutral if tax credit cap is hit gradually |
President Lee Jae-myung stated on April 18, 2026: “We will reduce deductions for holding periods without residency, and expand deductions for residency periods.”5 That language aligns squarely with Proposal A.
Does This Affect Your Home? Three Questions
Before drawing conclusions, it’s worth walking through three quick filters. The answer to the first question resolves the issue for a large majority of Korean homeowners.
Question 1: Is your property worth less than 1.2 billion won?
If yes — and if you own only one home — you pay no capital gains tax at all when you sell. The long-term holding deduction reform is structurally irrelevant to you. This covers most homeowners outside the Seoul metropolitan area and the majority even within it. Busan, Daegu, Gwangju: the deduction’s practical impact is close to zero regardless of what happens in the National Assembly.
Question 2: Is your property worth more than 1.2 billion won, and do you actually live there?
Under Proposal A, the residency-period deduction survives — and is actually enhanced (8% per year vs. 4% currently). If you have lived in your home for 10 years, you would accumulate an 80% residency deduction on your own. For genuine owner-occupiers of expensive Seoul apartments, the reform is either neutral or modestly favorable.
Question 3: Do you own a high-value Seoul property but live somewhere else?
This is the target. Under current law, you collect 4% per year just for holding — even if you’ve never slept there. Under Proposal A, that holding-period deduction disappears entirely. An owner who has held a non-occupied Gangnam apartment for 20 years currently shelters 40 percentage points of their gain purely from holding. That entire benefit could vanish.
The Comprehensive Property Tax Package
The long-term deduction reform does not stand alone. The government is simultaneously considering raising the comprehensive real estate tax (jongbuse) fair market value ratio from 60% to 80%.
According to Seoul Sinmun (July 9, 2026), if the 80% ratio is applied, the average per-person comprehensive real estate tax bill would rise from 3.24 million won to 6.24 million won — a 93% increase.6
Read together, these two reforms create a vice: hold a non-occupied expensive Seoul property, and you pay more every year in comprehensive real estate tax; sell it, and you lose much of the deduction cushion you were counting on. The policy logic is coherent — incentivize actual residence or liquidation — but the history of Korean property regulation suggests that outcomes rarely follow policy intent cleanly. Owners who can afford it may simply absorb the higher holding costs rather than sell into an uncertain market.
For context: Seoul apartment prices rose 0.30% in the first week of July 2026 alone, according to the Korea Real Estate Board (July 6, 2026).7 Policy tightening hasn’t always dampened price momentum, and there is no guarantee this cycle will behave differently.
Political Landscape and Timeline
The ruling Democratic Party, led by President Lee, supports the reform in principle. The opposition People Power Party (국민의힘) has labeled it a “tax bomb” and is opposing it. With the reform requiring legislative passage, the outcome depends on the balance of votes in the National Assembly.
The tentative effective date being discussed is January 1, 2027 — but this is not confirmed. Major provisions could still be amended, delayed, or blocked during the second-half regular National Assembly session. Owners of high-value non-occupied properties should monitor developments closely, as a decision to sell before versus after implementation could represent a meaningful difference in tax liability.
The Bottom Line
The long-term holding deduction reform is neither a universal “tax bomb” nor a simple “normalization” of the tax code. It is a targeted measure aimed at one specific profile: owners of expensive Seoul-area properties who have benefited from holding-period deductions without actually living in those homes.
If your home is worth less than 1.2 billion won, or sits outside the capital region, your direct exposure to this reform is effectively zero. If you live in the home you own in Seoul, the reform may actually work in your favor. Only the non-resident high-value holder faces a genuinely adverse change — and even that group still has options, including adjusting sale timing and consulting a tax professional about the interaction with other deductions.
The most productive first step for any homeowner right now is not anxiety — it is clarity about which bracket applies to them.
Footnotes
- Yonhap News Agency, “고가주택 장기보유특별공제 90.6% 서울 집중”, June 29, 2026. https://www.yna.co.kr
- Narasallim Research Institute, Analysis of Long-Term Holding Special Deduction Distribution, April 2026. https://www.narasallim.net
- Richmaninfo, “30억 초과 주택에 장특공제 44% 쏠려”, July 1, 2026. https://www.richmaninfo.com
- Citizens’ Coalition for Economic Justice / Donga Ilbo, Apgujeong Hyundai 3rd Complex tax burden analysis, March 3, 2026. https://www.donga.com
- President Lee Jae-myung public statement, April 18, 2026. Reported by Yonhap News and multiple domestic outlets.
- Seoul Sinmun, “종부세 공정시장가액비율 80% 시 1인당 평균 624만 원”, July 9, 2026. https://www.seoul.co.kr
- Korea Real Estate Board (한국부동산원), Weekly Apartment Price Trend Report, July 6, 2026. https://www.reb.or.kr
Investment Disclaimer: This article is provided for general informational purposes only and does not constitute individual tax, legal, or investment advice. All legislative proposals described are pending and subject to change based on National Assembly deliberations. Tax outcomes vary significantly based on individual circumstances including property value, holding period, residency history, and household composition. Readers are strongly advised to consult a qualified Korean certified tax accountant (semu-sa) or attorney before making any property sale or purchase decision. Past tax treatment and market performance do not guarantee future results.
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