Korean Inheritance Law and Cross-Border Estate Planning under Korean Law: A Comprehensive Guide

Korean inheritance law is complex and ever-changing, particularly when family and estate matters cross international borders. Issues of jurisdiction, nationality, residence, asset location, and inheritance taxation often overlap. The nationality of the decedent, the residence of both the decedent and the heirs, and the situs of assets may each affect the applicable inheritance law and tax treatment. For more information on Korean inheritance law, please see: IPG Legal’s Inheritance & Estate Law Archive.

For this reason, retaining an experienced Korean inheritance lawyer and a proactive tax professional is crucial to avoid disputes, minimize tax burdens, and safeguard family wealth.

With over seven million Koreans living abroad, including nearly three million in North America, inheritance cases involving Korea increasingly involve cross-border estates. Despite this global reality, many families remain without an estate plan, leaving their heirs exposed to unnecessary risk, taxation, and litigation.

This article, prepared by IPG Legal, addresses some of the most frequently asked questions by our clients regarding Korean inheritance law and inheritance tax.

Cross-Border Estate Planning for Korean Estates

1. Which Law Governs Wills and Inheritance in Korea?

Determining the governing law of succession depends on the nationality and residence of the decedent:

• Non-Korean Nationals:
  Generally, the law of the decedent’s nationality (or U.S. state of domicile, where applicable) governs succession, even if assets are located in Korea. However, Korean taxation may still apply.
  • If the decedent’s permanent residence was in Korea, worldwide assets may be subject to Korean inheritance tax.
  • If the decedent was a non-resident, only Korean-situs assets are taxable.
  • Foreign residents in Korea may elect to have Korean law apply to their estate.
• Korean Nationals Residing in Korea:
  Korean inheritance law applies, even if the will specifies otherwise.
• Korean Nationals Residing Abroad:
  • Without a will: Korean law will generally apply.
  • With a valid will: Korean courts usually recognize the law of the decedent’s residence.

Practice Tip: All individuals—Korean and non-Korean—should prepare a will and estate plan to minimize disputes and taxes. Proper planning ensures efficient inheritance procedures in Korea and abroad. We advise, in some cases, a trust and a living will.

2. Can a Decedent Disinherit a Spouse or Child Under Korean Law?

No. Under Korean law, heirs are entitled to a mandatory reserved portion of the estate (유류분 / 遺留分).

Even if a will expressly disinherits a spouse or child, Korean inheritance law requires that these heirs receive a minimum share.This rule applies when Korean law governs the estate.

Recent amendments and a Constitutional Court case have provided narrow exceptions for heirs who have clearly abandoned their legal or moral duties to their family. IPG Legal will provide a detailed analysis of these developments in a forthcoming update.

The Constitutional Court of Korea declared, in part, the mandatory legal reserve unconstitutional. However, the system was deemed, in of itself, constitutional. More information on this can be found at: Korea’s Statutory Inheritance Reserve Deemed Partially Unconstitutional.

3. How Is the Legal Reserve Calculated Under Korean Law?

Article 1112 of the Korean Civil Act governs the inheritance reserve:

• Lineal descendants (children/grandchildren): 50% of the statutory share
• Spouse: 50% of the statutory share
• Lineal ascendants (parents/grandparents): 33% of the statutory share
• Siblings: 33% of the statutory share

Only these categories of heirs are entitled to reserved shares. Others (such as more distant relatives) may inherit under intestacy but do not benefit from the reserve.

4. How Does Intestate Succession Work in Korea?

When a decedent dies without a valid will, the Korean intestate succession law applies. The order of priority is:

1. First priority: Lineal descendants (children and grandchildren)
2. Second priority: Lineal ascendants (parents and grandparents)
3. Third priority: Siblings
4. Fourth priority: Relatives within the fourth degree (e.g., uncles, aunts, nephews, nieces)

A surviving spouse inherits jointly with first or second priority heirs but receives an additional 50% share compared to other heirs of the same rank. If no such heirs exist, the spouse inherits the entire estate.

Caveat: Even when a will exists, Korean inheritance law mandates that heirs receive at least their reserved portion. Please see Section 3 above.

5. Are Holographic Wills Valid in Korea?

Yes. Korean law recognizes five forms of wills:

1. Notarial will
2. Holographic will
3. Secret/sealed document will
4. Recorded will
5. Dictated will

Strict compliance with statutory formalities is required. Defective wills may be declared invalid, leading to costly litigation and delays in transferring assets. Professional legal assistance is strongly recommended when drafting wills involving Korean assets. For more information on Holographic Wills, see: Korean Wills and Korean Holographic Wills.

6. Do Heirs Inherit the Debts of the Deceased?

Yes. Heirs inherit both assets and liabilities. Failure to renounce an estate with liabilities exceeding assets may result in heirs being legally bound by the debts. Korean judgments, including those concerning estate debts, are widely enforceable in foreign jurisdictions such as the United States, Canada, and the European Union. For more information on renouncing an estate in Korea and the inheritance of family debt, please see: Renouncing an Estate under Korean Law.

7. Can Heirs Renounce a Korean Inheritance?

Yes. Under Article 1041 of the Korean Civil Act, heirs may file a declaration of renunciation with the Korean family court within three months of notification of inheritance.

If this deadline passes, the estate is deemed accepted in full, including debts. Limited exceptions exist, and IPG Legal has successfully secured such relief for clients.

8. Does Korea Impose Inheritance Tax on Domestic and Global Estates?

Yes. Korean inheritance tax law distinguishes between residents and non-residents:

• Residents (more than 183 days in Korea or a permanent residence): Worldwide assets are taxable.
• Non-residents: Only Korean-situs assets are taxable.

For more information on the Korean Inheritance Tax, please see: Korean Inheritance Tax.

Key Deductions and Exemptions (2022)

• Resident deduction: KRW 500 million
• Basic deduction: KRW 200 million
• Child deduction: KRW 50 million per child
• Spousal deduction: KRW 500 million or the amount inherited (whichever is greater, subject to caps)
• Additional deductions for minors, seniors, and disabled heirs

Tax Rates (2022)

• Up to KRW 100 million: 10%
• KRW 100–500 million: 20% (deduction KRW 10 million)
• KRW 500 million–1 billion: 30% (deduction KRW 60 million)
• KRW 1–3 billion: 40% (deduction KRW 160 million)
• Above KRW 3 billion: 50% (deduction KRW 460 million)

Because inheritance tax law in Korea is highly complex—particularly with respect to residency determinations and cross-border estates—professional advice is indispensable.

Why Engage IPG Legal?

Korean inheritance law is one of the most complex areas of Korean civil law, particularly in cases involving cross-border elements. Issues of choice of law, forced heirship rules, and inheritance tax require careful advance planning.

At IPG Legal, we regularly assist clients—both Korean nationals and foreign residents—with:

• Drafting and reviewing wills under Korean law
• Cross-border inheritance planning
• Inheritance tax compliance and mitigation
• Renunciation of debt-laden estates
• Probate and intestate succession proceedings

With our in-house tax professionals and extensive litigation experience, we are uniquely positioned to help clients navigate Korea’s evolving inheritance and inheritance tax system.

For more information, please contact IPG Legal or explore our Korean Inheritance Law Archive for further resources.

by Sean Hayes
Sean Hayes is a senior foreign attorney at IPG Legal, one of Korea’s leading international law firms. With over two decades of experience in Korea, he is recognized as the first non-Korean attorney to work for the Korean court system and one of the first to be appointed a regular member of a Korean law faculty. He is known for his aggressive advocacy and proactive street-smart advice. Sean is recognized as a top attorney for his work in Asia, and his firm is ranked as a top dispute resolution law firm, with a tier ranking in the leading legal rating services.