How to Structure Assets for Cross-Border Estate Planning
한미 자산 구조 설계 — Estate Tax Treaty 부재와 OBBBA 2026 면제액
There is genuinely no U.S.–Korea estate or gift tax treaty (the U.S. has such treaties with only 16 countries, and Korea is not one of them) — but IRC §2014 separately provides a limited, treaty-independent U.S. credit for Korean death tax actually paid. Plus the 2026 OBBBA exemption figures.
Overview — Planning for Two Independent Systems 서로 독립된 두 제도를 위한 계획
A cross-border family with assets in both the U.S. and Korea faces U.S. estate tax on worldwide assets (for citizens and domiciliaries) and Korean inheritance tax on Korean-situs assets (regardless of the heir's residency) — with no treaty coordinating the two. Effective structuring requires treating these as two separate, uncoordinated tax systems that happen to both reach the same underlying assets, not as a single combined system with built-in relief.
Confirmed — There Is No U.S.–Korea Estate/Gift Tax Treaty 확인됨 — 한미 상속·증여세 조약은 존재하지 않음
South Korea is not among them.
- The 1976 U.S.–Korea Convention covers income tax only — its formal title is the "Convention... for the Avoidance of Double Taxation... With Respect to Taxes on Income." It contains no estate or gift tax provisions whatsoever.
- Countries with which the U.S. does have estate/gift tax treaties include Japan, Canada, the United Kingdom, Germany, France, and Austria, among others — Korea's absence from this list is a genuine structural gap, not an oversight in casual summaries.
- Practical consequence: there is no foreign tax credit mechanism, no treaty-based situs allocation rule, and no mutual agreement procedure for estate or gift tax double taxation between the U.S. and Korea. Any double taxation that arises must be addressed entirely through unilateral planning (asset structuring, timing, gifting) — there is no treaty relief to fall back on.
2026 Exemption Figures — OBBBA's Permanent $15M 2026 면제액 — OBBBA가 영구 확정한 $15M
With the federal exemption now permanently at $15M, many Korean-American families who would have been at risk under the previously expected sunset scenario (~$7M) are now comfortably below the federal threshold. This shifts planning priority for many families away from federal estate tax avoidance and toward (a) state estate tax exposure if domiciled in one of the twelve states with their own estate tax, and (b) Korean inheritance/gift tax, which remains fully applicable regardless of the U.S. federal exemption level.
Domicile — The First Question Domicile — 가장 먼저 확인할 질문
- U.S. citizens are always subject to worldwide estate/gift tax — citizenship alone settles this question.
- Green card holders and others are subject to the same worldwide rule if found U.S.-domiciled — a facts-and-circumstances test distinct from income tax residency, considering intent to remain, length of stay, family location, and similar ties.
- Non-domiciled individuals (even SPT-based income tax residents) face only the $60,000 exemption against U.S.-situs assets specifically — a dramatically different and far less favorable position than the $15M worldwide exemption.
- This single determination should be made explicitly and documented early in any cross-border estate plan — it changes every subsequent structuring decision.
Categorizing Assets by Situs 소재지 기준 자산 분류
| Asset Category | U.S. Estate Tax Risk (If Domiciliary) | Korean Inheritance Tax Risk |
|---|---|---|
| Korean real estate | HIGH — fully included in worldwide estate | HIGH — Korean-situs, taxed regardless of heir's residency |
| Korean business ownership (법인 지분) | HIGH — included, requires valuation | HIGH |
| Korean stock/brokerage accounts | HIGH | Generally HIGH |
| Korean cash/bank accounts | HIGH | Depends on Korean rules and relationship-based deductions |
| U.S. real estate | HIGH (always U.S.-situs) | Not directly Korean-taxed unless the heir is a Korean resident receiving worldwide assets |
| U.S. retirement accounts | HIGH | Not directly Korean-situs |
Five Structuring Options 5가지 구조 설계 옵션
- Removes the asset from the future U.S. estate
- Korean gift tax now may be lower than future Korean inheritance tax on a larger, appreciated value
- Korean gift tax applies immediately
- Loss of control over the asset
- Carryover (not stepped-up) basis if later sold by the recipient
- May reduce Korean inheritance tax through valuation discounts on fractional shares
- Allows gradual gifting of shares over time
- Form 5471 required for the U.S. owner (10%+ ownership)
- GILTI/NCTI exposure if the corporation is a CFC, unless check-the-box disregarded election is made
- Added compliance complexity
- Avoids U.S. probate
- Simplifies U.S. estate administration
- Does NOT reduce U.S. estate tax (revocable trusts are includible in the grantor's estate)
- Not recognized under Korean law — provides no benefit for Korean-situs assets
- Should not be assumed to address Korean assets at all
- Removes future appreciation from the taxable estate
- $19,000 annual exclusion per recipient (or $38,000 with gift-splitting) generates no exemption usage at all
- $15M lifetime exemption provides substantial additional capacity
- Korean gift tax may apply on the Korean side (recipient-based, no treaty coordination)
- Carryover basis — no step-up for the recipient, unlike inheritance
- A Qualified Domestic Trust (QDOT) can preserve marital-deduction-like deferral for U.S. assets left to a non-citizen spouse
- Annual exclusion gifts to a non-citizen spouse ($194,000 in 2026) avoid using lifetime exemption
- No unlimited marital deduction without a QDOT — direct bequests above available exemption are taxable
- QDOT has its own ongoing compliance requirements (U.S. trustee, distribution restrictions)
Living With Double Taxation — No Treaty Means No Automatic Relief 이중과세와 함께 — 조약이 없으니 자동 구제도 없음
Reporting Obligations by Structure 구조별 신고 의무
| Structure | Reporting Triggered |
|---|---|
| Direct individual ownership of Korean assets | FBAR, FATCA (Form 8938), Form 8621 if PFIC funds held |
| Korean corporation ownership (10%+) | Form 5471, plus Form 8992 if the corporation is a CFC |
| Lifetime gifts of Korean assets (recipient is a U.S. person) | Form 3520 if aggregate from related donors exceeds $100,000 |
| U.S. trust holding U.S. assets only | Standard U.S. trust/estate filings; no Korean-side benefit or filing relief |
5 Fully Computed Examples 실제 계산 사례 5개
| Korean apartment: $1.5M; Korean stocks: $500K; total estate (with other assets): $4M | |
| 2026 exemption: $15M — well below the threshold | $0 federal estate tax |
| Korean inheritance tax still applies independently to the Korean-situs assets | Up to 50%, no treaty credit available |
| If found U.S.-domiciled | Worldwide estate subject to U.S. estate tax with the $15M exemption — Korean real estate ($2M) and business ($3M) both included |
| If found NOT U.S.-domiciled | Only U.S.-situs assets taxed, with just a $60,000 exemption against those — Korean assets entirely excluded from the U.S. side (but still fully Korean-taxed) |
| Korean apartment held inside a family 법인; shares gifted gradually to children over several years, $19,000/year per recipient (no exemption used) | Each year's gift uses no lifetime exemption if within the annual exclusion |
| Form 5471 required throughout for the U.S.-resident parent's remaining ownership | GILTI/NCTI exposure unless check-the-box election made |
| Korean real estate, $3M value, included in a U.S. citizen's worldwide estate (assume total estate exceeds $15M for this illustration) | U.S. estate tax applies to this asset as part of the worldwide total |
| Korea separately taxes the same asset under Korean inheritance tax rules | No treaty-based credit exists — but IRC §2014 allows a credit against U.S. estate tax for the Korean death tax actually paid, capped at the lesser of that Korean tax or the proportional U.S. tax attributable to this asset |
| Given Korea's relatively high effective inheritance tax rates, the Korean tax paid frequently exceeds the §2014 cap | The excess beyond the credit limitation remains genuinely double-taxed, with no further relief or carryover |
| Without a QDOT: U.S. citizen leaves $5M of U.S. assets directly to a Korean-national (non-citizen) spouse | No unlimited marital deduction — taxable estate includes this $5M, applied against the deceased's own $15M exemption (using up exemption rather than deferring) |
| With a QDOT: same $5M passes into a properly structured trust for the surviving non-citizen spouse | Estate tax on this portion is deferred until distributions are made from the QDOT or the spouse's death — preserving more of the deceased's exemption for other beneficiaries |
Common Mistakes 자주 발생하는 오류
- 1 Assuming a treaty-based credit exists for U.S.–Korea estate/gift tax, or conversely assuming no credit exists at all. No estate/gift tax treaty exists — the 1976 convention covers income tax only. But IRC §2014 provides a separate, limited, treaty-independent U.S. credit for Korean death tax actually paid. Double taxation on Korean-situs assets is typically only partially addressed by this credit, with the remaining gap requiring structuring.
- 2 Planning around outdated exemption figures (roughly $6.8M or a 2026 sunset scenario). OBBBA permanently set the 2026 federal exemption at $15M — current plans should reflect this baseline.
- 3 Using a U.S. revocable trust and assuming it addresses Korean assets. U.S. trusts are not recognized under Korean law and provide no benefit — Korean assets require entirely separate planning.
- 4 Not determining domicile status explicitly before structuring. The difference between $15M and $60,000 in exemption hinges entirely on this determination — it should be resolved and documented first, not assumed.
- 5 Gifting Korean appreciated assets without considering the carryover basis consequence. Lifetime gifts pass along the donor's original basis; only inheritance receives a step-up to date-of-death value — this materially affects future capital gains for the recipient.
- 6 Using a Korean corporation to hold real estate without evaluating the check-the-box election. Leaving the entity in default corporate classification triggers Form 5471/GILTI exposure; a disregarded election (if the entity type qualifies) can avoid this while still achieving the fractional-gifting benefit.
- 7 Leaving U.S. assets directly to a non-citizen spouse without considering a QDOT. This forfeits the deferral benefit a properly structured QDOT would provide, using up the deceased's exemption immediately instead.
- 8 Not coordinating U.S. and Korean advisors on the same plan. A structuring decision that looks optimal from the U.S. side alone (e.g., a certain gifting pattern) may create unexpected or suboptimal Korean gift/inheritance tax consequences if not reviewed by Korean tax counsel simultaneously.
Hanmi CPA Insight
The absence of an estate/gift tax treaty between the U.S. and Korea is the single fact that should anchor every cross-border estate planning conversation for Korean-American families — but the correct conclusion sits between two oversimplifications. It is wrong to say a treaty provides meaningful relief — no such treaty exists; the 1976 U.S.–Korea convention addresses income tax exclusively. It is equally wrong to conclude there is therefore zero relief mechanism at all: IRC §2014 provides a real, U.S. domestic-law credit for Korean death tax actually paid, entirely independent of any treaty. The credit is capped by a limitation formula that frequently falls short of Korea's relatively high effective inheritance tax rates — so families should plan for partial relief on the U.S. side, with the remaining gap closed only through structuring choices made before the taxable event, not assume either complete relief or none at all.
OBBBA's permanent $15 million exemption changes the relative urgency of U.S.-side planning without changing the Korean-side analysis at all. A family that previously worried about both a shrinking U.S. exemption and an uncoordinated Korean tax now generally only needs to worry about the latter — Korean inheritance tax, at rates up to 50%, remains exactly as significant as it always was, untouched by anything that happens in U.S. tax legislation. This means the planning conversation for many Korean-American families should shift from "how do we avoid U.S. estate tax" to "how do we manage the now-larger, uncoordinated Korean tax exposure on our Korean-situs assets" — a different question requiring different tools (Korean-side gifting timing, entity structuring, valuation planning) than U.S. exemption-maximization strategies.
The five structuring options in this guide are not mutually exclusive, and the right combination depends heavily on family-specific facts — particularly domicile status, the relative size of U.S. versus Korean holdings, and whether a non-citizen spouse is involved. What they share is a common thread: because no treaty coordinates the two systems, and the available IRC §2014 credit only partially offsets Korean tax at best, every option's value depends substantially on actually reducing the value or repositioning the situs of Korean assets before the taxable event — not on relying on the statutory credit to close the gap after the fact. This is why proactive, multi-year structuring — rather than reactive estate settlement — is where the real planning value lies in this topic.