Case Studies
Case Study: How South Korea’s Exit Tax Applies to Major Shareholders
When does moving abroad trigger exit tax on stock holdings? This case-study breaks down Korea’s “국외전출자 주식등 양도소득세” rule with real figures and planning tips.
By NomadicTax Research Team • 5-8 min read • September 15, 2026
## 1. Understanding the Rule: What is 출국자 주식등 양도소득세?
South Korea imposes a tax on **major shareholders** (“대주주”) who **cease Korean residency** by emigrating or reporting overseas departure (**출국**)—taxing them on the **unrealized gains** in domestic shareholdings at exit date as if sold. ([nts.go.kr](https://www.nts.go.kr/nts/cm/cntnts/cntntsView.do?cntntsId=7821&mi=2515&utm_source=openai))
This “exit tax” is part of the **국외전출자 주식등 양도소득세** regime and targets mitigating tax base erosion through capital flight.
## 2. Who Qualifies?
| Criteria | Details |
|---|---|
| Major Shareholder | Someone holding shares surpassing thresholds (e.g., ownership percentage or value). The specific thresholds are defined under the 세법 시행령 (Enforcement Decree). ([nts.go.kr](https://nts.go.kr/nts/cm/cntnts/cntntsView.do?cntntsId=8800&mi=12274&utm_source=openai))|
| Departure Type | Includes formal overseas emigration or other moves that change tax residency under Korean law. Must make **해외이주 신고** via the Ministry of Foreign Affairs. ([nts.go.kr](https://www.nts.go.kr/nts/cm/cntnts/cntntsView.do?cntntsId=7821&mi=2515&utm_source=openai))|
## 3. How is the Tax Calculated?
At exit, the **unrealized gain** (current market value minus acquisition cost) on certain shareholdings is treated as a **양도소득 (capital gain)** and taxed per the capital gains rules for large shareholders. The taxpayer must submit the **납세증명서** (tax compliance certificate) to the Ministry of Foreign Affairs as part of departure paperwork. ([nts.go.kr](https://www.nts.go.kr/nts/cm/cntnts/cntntsView.do?cntntsId=7821&mi=2515&utm_source=openai))
## 4. Example Scenario
> John, a resident of Korea, owns shares in two domestic companies. He’s a large‐shareholder in one (over threshold), and holds smaller stakes in another. He acquired them at KRW 200 million. Upon moving abroad mid-2026, the current value is KRW 800 million for those shares.
>
> - Exit tax will apply to the KRW 600 million unrealized gain (on shares classified as 대주주 holdings).
> - If his combined gains are taxed at, say, 20–25%, his tax liability could be approximately **KRW 120–150 million** depending on the rate for large shareholders.
>
> Shares below threshold or not classified as 대주주 might **not** trigger exit tax.
## 5. Planning and Compliance Steps
- Assess if you qualify as 대주주—track your shareholding percentage and value regularly.
- Estimate unrealized gains periodically and monitor market value at potential departure dates.
- File 해외이주 신고 and ensure 납세증명서 is submitted and up to date.
- Consider **selling shares before moving**, if possible, to use progressive rates rather than exit tax (if more favorable). But note acquisition cost records still need to be intact.
## 6. Caveats
- Disposing shares triggers capital gains tax rules and possible forfeiture of preferences or exemptions.
- Non-resident vs resident dates matter: residency ending date determines what is taxable.
- Acquisition cost must be documented—lost records may lead to higher base used.
By mapping your shareholding status, documenting costs, and choosing departure timing consciously, major shareholders can meaningfully reduce exposure under South Korea’s exit tax regime.