US Estate Tax Exposure for Non-US Persons: What Globally Mobile Families Need to Know

US income tax rules for Americans abroad receive significant attention. US estate tax rules for non-Americans are far less understood and in many cases, far more immediately consequential. For internationally mobile families with any US-situs assets, the estate tax framework represents one of the most significant and underappreciated financial risks in cross-border planning.

This article explains how the rules work, where the exposure comes from, and what it means for families in Asia Pacific who may have US financial ties they have not fully mapped.

The foundational asymmetry: two very different exemptions

The US federal estate tax applies to transfers of wealth at death. For US citizens and US domiciliaries, the exemption is substantial, currently in the multi-million dollar range, though it is subject to legislative change. For non-resident aliens (NRAs)  (individuals who are not US citizens and are not domiciled in the US) the exemption is $60,000.

• NRA estate tax exemption: $60,000 (not indexed for inflation)
  
• Top marginal rate: 40% (on US-situs assets above exemption)
  
• US estate tax treaties: ~16 (very few in Asia Pacific)

The $60,000 exemption has not been updated for inflation in decades. For anyone holding meaningful US assets, it is effectively a nominal threshold. Assets above it are subject to progressive estate tax rates that reach 40% at the top.

The core mechanism: The US taxes the US-situs assets of non-resident aliens at death, regardless of where the decedent lived, was a citizen of, or paid income taxes during their lifetime. Residency, income tax history, and the location of the decedent at time of death are irrelevant to the analysis. What matters is the nature and location of the asset.

What counts as a US-situs asset?

The concept of situs, where an asset is legally located for estate tax purposes, determines whether the US can tax it. For non-resident aliens, the following are generally treated as US-situs assets and therefore subject to US estate tax:

• US real property (including vacation homes purchased by non-residents)
• Stock in US corporations; including publicly traded shares, ETFs holding US equities, and equity compensation such as restricted stock units (RSUs) granted by a US employer
• Debt obligations of US persons, businesses, or the US government (with some exceptions)
• Cash held in US bank accounts (generally)
• Tangible personal property located in the US at time of death

Non-US-situs assets, such as stock in foreign corporations, bonds issued by foreign governments, and assets held entirely outside the US, are generally not subject to US estate tax in the hands of a non-resident alien.

The RSU trap

One of the most common real-world examples of this exposure involves equity compensation. A professional working outside the US for a subsidiary or affiliate of a US parent company may receive RSUs as part of their compensation package. Those RSUs represent stock in a US corporation. They are US-situs assets. If that individual holds a meaningful unvested or vested position at the time of death, their estate faces potential US estate tax on the full value, above only the $60,000 exemption, with no income tax history, no residency, and often no awareness that such exposure existed.

This is not a theoretical scenario. It has played out for surviving spouses who had no prior involvement in the US financial system and no expectation of dealing with US tax authorities.

The role of territorial tax regimes and why they amplify exposure

Many countries in Asia Pacific operate territorial tax systems: they tax only income arising within their borders, not investment income earned internationally. Singapore and Malaysia are prominent examples. This creates a rational planning incentive to hold investments offshore, including in US-domiciled accounts or US-listed securities, because local tax on such income is not assessed.

Interactive Brokers, Schwab, and similar US-based brokerage platforms have historically opened accounts for residents of a number of Asian countries, enabling direct access to US individual stocks and ETFs. From a local tax perspective, this has often been advantageous. From a US estate tax perspective, it can create significant exposure that was never part of the original planning conversation.

The person holding $500,000 in a US brokerage account may owe zero local income tax on their dividends and capital gains and their estate may face US estate tax of approximately $176,000 on the same assets at death ($500,000 minus $60,000 exemption, taxed at roughly 40%).

The treaty situation in Asia Pacific

The US has estate and gift tax treaties with approximately 16 countries worldwide. These treaties can raise the effective exemption available to residents of treaty countries and modify the situs rules in various ways. For advisors and clients in Asia Pacific, the landscape is sparse.

Japan is the notable exception in the region, it has both a US estate tax treaty and an income tax treaty with the US. Most other major jurisdictions in Asia Pacific have neither. Australia, Singapore, Hong Kong, South Korea, Taiwan, India, and New Zealand all lack a US estate tax treaty, meaning residents of those countries cannot rely on any bilateral agreement to modify the default NRA rules. Some (including Australia, South Korea, India, and New Zealand) do have income tax treaties with the US, but income tax treaties do not govern estate tax treatment and provide no relief in this context. Singapore, Hong Kong, and Taiwan have no treaty relationship with the US in either category.

Treaty status should always be verified with a qualified tax professional and confirmed against current US Treasury guidance, as treaty positions can change.

The practical consequence is that for the vast majority of Asia Pacific residents holding US-situs assets, the default framework applies in full: a $60,000 exemption and a top rate of 40% on everything above it, with no bilateral modification available.

The intersection with citizenship planning

A theme that arises frequently with families in Asia Pacific is intergenerational citizenship planning: parents securing US passports for children born in the US, giving the next generation optionality and mobility. As Hui-chin Chen noted in our conversation, for more planning-oriented families, this decision is made deliberately. But the financial architecture of the family does not always keep pace with it.

The US passport held by the second generation creates a US person within the family structure. That individual is subject to worldwide income tax reporting, FBAR and FINCEN reporting obligations on foreign financial accounts, and the full US estate and gift tax regime — including rules governing transfers from non-US family members that may constitute foreign gifts requiring disclosure. If the family's wealth is held in structures, accounts, or closely-held companies where the US-person child has signatory authority or beneficial ownership, those facts may create reporting obligations that neither generation anticipated.

The planning implication is that the decision to establish citizenship for the next generation should coincide with a full review of family financial structures — not years later when a tax event forces the issue.

Inadvertent inclusion of a non-US spouse in US tax filings

A separate but related exposure arises in mixed-nationality couples where one spouse is a US person and one is not. US tax rules offer filing status elections that can appear advantageous in a given year — claiming a non-US spouse as a dependent, or filing jointly under certain elections. When these elections are made without full visibility into the non-US spouse's financial picture, they can bring that spouse's worldwide income and assets into the US reporting framework unintentionally.

In family structures common across Asia Pacific — where joint accounts with parents, signatory authority over family business accounts, or inherited ownership interests are part of normal estate and wealth management practice — the implications of this inadvertent inclusion can be significant. The non-US spouse may not even be aware of the filing position taken on the US return.

Key planning considerations for globally mobile families with US-situs exposure

• Identify all US-situs assets held by non-US family members, including equity compensation, US brokerage accounts, US real property, and interests in US entities
• Assess whether any applicable estate or gift tax treaty modifies the default NRA rules
• Review jointly-held or signatory-only accounts for potential reporting implications if a US-person family member is involved in tax filings
• Include family accounts, business interests, and inherited holdings in the financial audit — not only personal accounts
• Begin planning at least four to six months before any international relocation that changes tax residency
• Coordinate citizenship planning for the next generation with a concurrent review of family financial structures and estate plans

What to do if you already hold US-situs assets

Awareness of the exposure does not eliminate it, but it does create planning options. Depending on the nature of the assets, the family's overall financial picture, and the applicable rules in their country of residence, there may be ways to restructure holdings, use entities, or take other steps to manage the estate tax exposure over time. The right approach will be specific to individual circumstances and should be developed with a qualified cross-border tax professional who understands both the US rules and the relevant local law.

What is not an option is assuming the rules don't apply because you are not American, have never lived in the US, or have always paid your taxes locally. The US estate tax on US-situs assets of non-resident aliens is a self-contained regime that operates independently of those facts.

Passport to Wealth Podcast

Listen to the full conversation with Hui-chin Chen of Jade & Cowry covering US-connected individuals, transitional tax regimes, and what families in Asia Pacific need to know before any cross-border move.

_{The content in this article is for informational purposes only and does not constitute financial, tax, or legal advice. Tax rules are complex, jurisdiction-specific, and subject to change. The figures and treaty status referenced reflect publicly available information and should be verified with a qualified professional before relying on them. Consult a licensed cross-border tax adviser before making any decisions based on your specific circumstances.}