Do U.S. Estate Taxes Apply to Korean Assets?
한국 자산에 대한 미국 상속세 적용 — OBBBA 영구 면제액 $15M 2026
The 2026 federal estate tax exemption is permanently $15 million per person under OBBBA — the TCJA sunset that would have cut it to roughly $7M never happened. Plus the dramatic $60,000 exemption for non-domiciled nonresident aliens, and state-level estate taxes that apply regardless of the federal exemption.
Overview — Worldwide Estate Tax for Citizens and Domiciliaries 시민·거주자(상속세 기준)는 전세계 자산에 상속세 적용
A U.S. citizen or a U.S. domiciliary (resident for estate tax purposes, a distinct test from income tax residency) is subject to U.S. estate tax on worldwide assets at death — including Korean real estate, bank accounts, brokerage holdings, business ownership, and pension rights. Location of the asset, whether it ever entered the U.S., and whether Korea also taxes the same inheritance do not change this baseline rule.
The 2026 Exemption — OBBBA Made It Permanent at $15M 2026 면제액 — OBBBA가 1,500만 달러로 영구 확정
- TCJA's doubled exemption scheduled to expire December 31, 2025
- Reversion to pre-TCJA baseline (~$5M, adjusted for inflation to roughly $7M)
- Drove urgent "use it or lose it" gifting in 2023–2025
- Sunset eliminated entirely — no scheduled expiration
- Exemption INCREASED to $15M (higher than the pre-OBBBA 2025 level of $13.99M)
- Gifts made 2018–2025 under the higher TCJA exemption remain protected from clawback under Treasury Reg. §20.2010-1(c)
Domicile — The Facts-and-Circumstances Test 상속세상 Domicile — 사실관계 종합 판단
Estate tax "residency" (domicile) is a separate legal concept from income tax residency, determined by subjective intent rather than the bright-line green card or Substantial Presence tests.
- Domicile factors include: intent to remain in the U.S. indefinitely, length and pattern of stay, home ownership, family location, visa/green card status, business ties, and other personal connections.
- A green card holder is not automatically U.S.-domiciled for estate tax purposes — though green card status is strong evidence of intent to remain, and most green card holders living substantially in the U.S. will be found domiciled. A green card holder who has lived in Korea for many years, with minimal U.S. ties, presents a genuinely fact-specific domicile question.
- Abandoning a green card does not automatically end estate tax domicile if the person's actual intent and ties still point to the U.S. — domicile can persist or terminate somewhat independently of the formal immigration status change.
- This is why domicile is described as one of the highest-stakes, least bright-line determinations in cross-border estate planning — the consequence of being wrong is the difference between a $15,000,000 exemption and a $60,000 exemption (Section 4).
The Dramatic NRA Exemption Gap — $60,000 비거주 외국인의 극단적으로 낮은 면제액 — $60,000
This NRA framework applies in the opposite direction from the main topic of this guide (it concerns U.S.-situs assets of a non-domiciled Korean national, not Korean assets of a U.S. person) — but it is essential context for any Korean-American family where one spouse may be a U.S. domiciliary and the other is not.
Korean Assets Included in the Gross Estate 미국 상속세 과세대상에 포함되는 한국 자산
| Asset Type | Included in U.S. Gross Estate (If Citizen/Domiciliary)? |
|---|---|
| Korean real estate (regardless of how/when acquired) | YES — full fair market value at death |
| Korean bank accounts, brokerage accounts, cash, time deposits | YES |
| Cryptocurrency held on Korean exchanges | YES |
| Korean corporation ownership (법인 지분) | YES — valued as of the date of death (often requiring a business valuation) |
| Korean pension rights (vested/accrued value) | YES, generally — specific characterization depends on the plan structure |
| Korean life insurance the decedent owned | YES if the decedent owned the policy (incidents of ownership) — proceeds payable to a third party are still included in the decedent's estate if they retained ownership rights |
State Estate Taxes — Independent of the Federal Exemption 주(州) 상속세 — 연방 면제액과 별개
Example thresholds: Massachusetts taxes estates above $2,000,000; Oregon above $1,000,000; Washington above approximately $2,193,000 (varies by year). These thresholds apply to the decedent's worldwide estate for a domiciliary of that state, generally tracking the federal inclusion rules — meaning Korean assets are included for state estate tax purposes too.
Korean Inheritance Tax and Double Taxation 한국 상속세와 이중과세 문제
- Korea taxes inheritances at progressive rates up to 50% (with a surtax pushing the effective top rate to approximately 60% for certain very large estates involving controlling shareholders of Korean companies, per recent Korean tax law).
- Korean real estate, Korean financial assets, and Korean business interests held by a Korean national or inherited by Korean heirs are subject to Korean inheritance tax regardless of the deceased's U.S. status.
- The same asset can be taxed by both countries — Korea taxing it as Korean-situs property, and the U.S. taxing it as part of a citizen's or domiciliary's worldwide estate.
No U.S.–Korea Estate/Gift Tax Treaty Exists 한미 상속·증여세 조약은 존재하지 않음
- However, a separate U.S. domestic-law mechanism — IRC §2014 — does provide a limited, unilateral credit for foreign death taxes actually paid, available to citizen and domiciliary decedents regardless of whether any treaty exists. This is not a treaty benefit; it is built into the U.S. estate tax statute itself.
- The §2014 credit is capped by a limitation formula(the lesser of the Korean tax paid, or the proportional U.S. estate tax attributable to that specific Korean asset) — meaning it frequently does not fully offset Korean inheritance tax, particularly given Korea's relatively high effective rates (up to 50%+). The result is partial relief, not full elimination, and not the complete absence of any credit either.
- Any reduction in the combined burden must come from structuring(asset repositioning, lifetime gifting, entity planning) completed before the taxable event — not from a credit or treaty relief claimed afterward.
Planning Strategies 계획 전략
- Lifetime gifting using the $19,000 (2026) annual exclusion per recipient — $38,000 for a married couple via gift-splitting — removes assets from the estate with no use of the lifetime exemption.
- Trust structures(irrevocable trusts, including those holding Korean assets where feasible) can remove assets from the taxable estate, though funding a trust with Korean real estate or business interests requires careful Korean-side legal and tax coordination.
- Ownership restructuring of Korean corporations (e.g., gifting minority interests during lifetime, using valuation discounts for closely-held interests) can reduce the date-of-death value subject to estate tax.
- Domicile planning — for someone genuinely uncertain about U.S. domicile status, intentionally documenting ties (or lack thereof) to the foreign country can affect the outcome of a future domicile determination, though this requires genuine, consistent behavior, not just paperwork.
- With the $15M exemption now permanent, most Korean-American families are below the federal threshold — the planning priority for many shifts from federal estate tax avoidance to state estate tax exposure (if domiciled in one of the twelve states) and Korean inheritance tax coordination.
5 Fully Computed Examples 실제 계산 사례 5개
| Korean apartment: $1.2M; Korean stocks: $500K; Korean bank accounts: $300K; U.S. assets: $1M | Total worldwide estate: $3M |
| 2026 exemption: $15M — estate is far below the threshold | $0 federal estate tax |
| Korean inheritance tax may still apply to the Korean-situs assets independently | Korean-side filing and tax remain a separate matter |
| Korean real estate: $8M; Korean stocks: $2M; U.S. assets: $1M | Total: $11M |
| 2026 exemption: $15M — this estate, while large, remains below the federal threshold | $0 federal estate tax (would have likely been taxable under the pre-OBBBA sunset scenario of ~$7M) |
| If domiciled in a state with its own estate tax (e.g., Massachusetts, $2M threshold) | State estate tax could still apply despite no federal liability |
| If found U.S.-domiciled (e.g., intent to return, U.S. home maintained, family in U.S.) | Worldwide estate taxed; $15M exemption applies; Korean assets included |
| If found NOT U.S.-domiciled (genuine permanent relocation, no U.S. ties, green card maintained only for periodic U.S. visits) | Treated as a nonresident alien for estate tax purposes — only U.S.-situs assets taxed, with only a $60,000 exemption against those specific U.S. assets |
The domicile determination, not the green card status itself, is what actually controls — this is a genuinely fact-intensive analysis requiring careful documentation either way.
| Korean national, never U.S. domiciled, owns a $400,000 U.S. vacation condo plus a $200,000 U.S. brokerage account | U.S.-situs assets: $600,000 |
| NRA exemption: only $60,000 | $540,000 subject to U.S. estate tax (up to 40%) — Korean assets owned by this same person are entirely excluded from the U.S. estate, since they aren't U.S.-domiciled |
| Korean real estate valued at $3M at death, included in a U.S. citizen's worldwide estate (assume total estate exceeds the $15M exemption for this illustration) | Korea taxes the property under its own inheritance tax rules (up to 50%); U.S. estate tax also applies to the same asset as part of the worldwide estate (40% on the excess over the exemption) |
| IRC §2014 credit available (no treaty needed) but capped at the lesser of the Korean tax paid or the proportional U.S. tax attributable to this asset | If Korean tax paid exceeds that proportional U.S. amount — common given Korea's high rates — the excess remains genuinely double-taxed with no further relief |
| The most reliable mitigation is structuring completed before death | e.g., lifetime gifting of the property in stages, or restructuring through a Korean entity with valuation discounts (Section 6, Options A and B) — since the §2014 credit alone rarely closes the full gap |
Common Mistakes 자주 발생하는 오류
- 1 Planning around an estate tax exemption figure of roughly $7M or assuming a 2026 sunset reduction. OBBBA permanently set the 2026 exemption at $15M per person, eliminating the TCJA sunset entirely — estate plans built on the old assumption should be reviewed and likely revised.
- 2 Assuming Korean assets are outside U.S. estate tax simply because they're located in Korea. Location is irrelevant for a U.S. citizen or domiciliary — only domicile/citizenship status determines worldwide inclusion.
- 3 Assuming green card abandonment automatically ends estate tax domicile. Domicile is a separate, facts-and-circumstances determination that can persist or terminate somewhat independently of the formal immigration status change.
- 4 Not recognizing the dramatic NRA exemption gap ($60,000 vs. $15M). A Korean national with U.S. assets but no U.S. domicile faces a vastly lower exemption on those specific U.S.-situs assets than a U.S. domiciliary would on their entire worldwide estate.
- 5 Ignoring state estate tax exposure because the federal exemption is high. Twelve states and D.C. impose their own estate tax with thresholds as low as $1–2 million — a high federal exemption provides no protection from these.
- 6 Not planning for Korean inheritance tax independently of U.S. estate tax planning. Korea taxes inheritances of Korean-situs assets regardless of the deceased's U.S. status — this is a separate filing and payment obligation with no treaty-based coordination with the U.S. side at all.
- 7 Assuming either that a treaty eliminates double taxation, or that no credit exists at all. Both extremes are wrong: no U.S.–Korea estate tax treaty exists, but IRC §2014 provides a real, limited, treaty-independent credit for Korean death tax actually paid — capped by a formula that often falls short of fully offsetting Korea's relatively high rates.
- 8 Not valuing Korean corporation ownership or other illiquid Korean assets properly for estate tax purposes. Family-owned Korean businesses require a defensible date-of-death valuation, which is more complex than for publicly traded securities and should be obtained from a qualified appraiser familiar with both U.S. estate tax valuation standards and Korean business records.
Hanmi CPA Insight
The single most consequential update to how this topic should be discussed in 2026 is that the exemption anxiety driving estate planning conversations for the past several years has been resolved — not reduced, but resolved in the opposite direction of what was expected. OBBBA's permanent $15 million exemption means the overwhelming majority of Korean-American families who were not previously subject to federal estate tax remain comfortably below the threshold, and many families who were genuinely at risk under the anticipated ~$7M sunset scenario are now also below it. This is a genuinely different planning environment than the one that prevailed through 2025, and any estate plan, gifting strategy, or trust structure built specifically to beat a 2026 deadline should be revisited with this new baseline in mind — not necessarily undone, since the structures often retain other benefits, but reassessed for whether the original urgency still applies.
The domicile determination remains the area where the highest stakes and the least certainty intersect, and the $15M-versus-$60,000 exemption gap between domiciled and non-domiciled status is what makes this determination so consequential. A green card holder who has genuinely relocated to Korea, with the green card maintained mainly for periodic U.S. visits or family reasons, faces real uncertainty about which side of this line they fall on — and the financial difference between the two outcomes is enormous. This is not a question that resolves itself through paperwork alone; it requires a consistent, documented pattern of actual intent and behavior, ideally established well before any estate tax question becomes live.
For Korean-American families now comfortably below the $15M federal threshold, the practical planning focus should shift toward two areas that the federal exemption increase does not address: state estate tax exposure for the twelve states (and D.C.) that impose their own, much lower thresholds, and the independent, uncoordinated Korean inheritance tax that applies to Korean-situs assets regardless of what the U.S. federal exemption does. A family that breathes a sigh of relief at the $15M federal number but lives in Massachusetts or New York, or holds significant Korean real estate, has not actually completed their estate tax analysis — they've addressed only the largest, but not the only, relevant tax.