The United States imposes estate tax on the U.S.-situs assets of non-citizens who are not domiciled in the United States at death. The federal estate tax exemption for this population is $60,000 — compared to the approximately $13.99 million available to U.S. citizens and domiciliaries. For a non-U.S. investor who owns a Miami condominium, a brokerage account at a U.S. custodian, and interests in a U.S. operating company, the exposure is real and measurable. It is also largely addressable through timely planning. The irrevocable trust is one of the primary structural tools available to non-citizen investors and their families. This article describes how these structures work and the planning considerations that govern them — it is not tax advice, and outcomes depend on individual facts reviewed by qualified legal and tax counsel.

The Non-Citizen Estate Tax Problem

Under Sections 2101 through 2108 of the Internal Revenue Code, a non-resident alien — defined as a non-citizen who is not domiciled in the United States — is subject to U.S. estate tax only on U.S.-situs assets. The domicile determination is not the same as tax residency: domicile is a facts-and-circumstances determination based on physical presence, intent to remain, and other indicators, and it is possible to be a U.S. tax resident (subject to worldwide income tax) without being a U.S. domiciliary for estate tax purposes, and vice versa.

The $60,000 exemption means that a non-resident alien with $5 million in U.S.-situs assets has $4.94 million exposed to estate tax at rates up to 40%. The tax is due within nine months of death, and it attaches to U.S.-situs property regardless of where the decedent's estate is being administered or who the beneficiaries are.

The contrast with U.S. citizens and domiciliaries is stark. A U.S. citizen who owns the same $5 million in U.S. assets has a $13.99 million exemption — the entire estate may be covered. A non-citizen investor with no planning in place is exposed to a tax that was not designed with their situation in mind and that operates without the exemptions and deductions available to the domestic estate.

What Counts as a U.S.-Situs Asset

Understanding the estate tax exposure requires knowing which assets are treated as U.S.-situs property. The rules under Section 2104 of the Code define situs asset by asset class:

  • U.S. real property — real estate physically located in the United States is always U.S.-situs for estate tax purposes. This includes land, buildings, condominiums, and commercial property.
  • Stock of U.S. corporations — shares of corporations organized under U.S. law are U.S.-situs property, regardless of where the stock certificates are held or where the shareholder lives. This includes publicly traded U.S. equities held in a foreign brokerage account.
  • Debt obligations of U.S. persons — certain debt instruments issued by U.S. issuers may be U.S.-situs, with specific exceptions for portfolio interest obligations.
  • Cash on deposit in U.S. banks — deposits in U.S. bank accounts are generally U.S.-situs, subject to a significant exception for non-interest-bearing deposits (bank deposits of non-resident aliens at U.S. banks that do not bear interest are generally excluded from the U.S.-taxable estate under Section 2105(b)).
  • Interests in U.S. partnerships and LLCs — the situs of a partnership or LLC interest is generally determined by the situs of the entity's underlying assets, which makes the analysis fact-intensive for entities that hold a mix of U.S. and non-U.S. assets.

Non-U.S.-situs assets — foreign real estate, stock of non-U.S. corporations, deposits with foreign banks — are not subject to U.S. estate tax in the hands of a non-resident alien. This asymmetry means that structuring how U.S.-situs assets are held can alter the estate tax profile significantly, depending on how the structure operates under applicable law.

How Irrevocable Trusts Are Used in This Context

An irrevocable trust is a trust in which the settlor surrenders control over the trust assets and cannot unilaterally revoke or amend the trust. The irrevocability is not merely a formality — it is the structural feature that affects how U.S. estate tax rules interact with the trust. A revocable trust, by contrast, is generally included in the settlor's taxable estate because the settlor has retained the power to reclaim the assets.

For a non-citizen investor, an irrevocable trust can be structured to hold U.S. assets during the settlor's lifetime. If the trust is properly drafted to avoid the estate inclusion provisions of Sections 2033 through 2044 of the Code — meaning the settlor does not retain a prohibited interest in or power over the trust assets — the trust assets may not be included in the settlor's taxable estate at death. Whether this outcome is achieved depends on the specific terms of the trust, the nature of the transferred assets, the timing and manner of the transfer, and the application of applicable law by qualified counsel. We describe this as a structural possibility, not a guaranteed result.

Timing matters enormously. A transfer of U.S. assets to an irrevocable trust is a completed gift for U.S. gift tax purposes if the settlor is a U.S. domiciliary at the time of transfer. For a non-resident alien settlor, the U.S. gift tax does not apply to transfers of non-U.S.-situs property — but transfers of U.S.-situs property (including U.S. real estate) are subject to U.S. gift tax even by non-resident aliens, with a $18,000 annual exclusion (2025) and no lifetime exemption for non-resident aliens transferring U.S.-situs property (unlike the unified credit available to U.S. citizens and domiciliaries).

This asymmetry — where the gift tax applies to U.S.-situs transfers by non-resident aliens but without the generous exemptions available to U.S. persons — means that simply gifting U.S. real estate into a trust is not a cost-free strategy. The structure must be designed to balance the long-term estate tax benefit against the immediate gift tax cost, and in some cases the economics favor holding assets in the trust from inception rather than transferring them after they have been held individually.

Grantor Trust Rules and Non-U.S. Settlors

The grantor trust rules under Sections 671 through 679 of the Code apply to irrevocable trusts as well as revocable ones. A trust that is irrevocable from a state-law standpoint may nonetheless be treated as a grantor trust for U.S. income tax purposes if the settlor retains certain powers — including certain powers to control beneficial enjoyment, administrative powers, or the power to borrow from the trust without adequate interest or security.

For non-citizen settlors, grantor trust status creates a nuanced planning tension. On the income tax side, a grantor trust means that the trust's income is taxed directly to the settlor rather than to the trust or its beneficiaries — which may simplify the reporting structure and avoid the compressed trust income tax brackets that apply to non-grantor trusts. On the estate tax side, a trust where the settlor retains powers sufficient to create grantor trust status may also be pulled into the settlor's taxable estate under the estate inclusion provisions — particularly Section 2036 (retained enjoyment or right to designate who shall possess trust property) and Section 2038 (power to alter, amend, revoke, or terminate).

The coordination between the grantor trust income tax rules and the estate tax inclusion provisions means that a trust designed for estate tax efficiency may create income tax complexity, and vice versa. There is no universally optimal solution — the structure must be calibrated to the settlor's priorities, and the trade-offs must be evaluated by counsel who understands both regimes.

QDOT: The Qualified Domestic Trust for Non-Citizen Spouses

U.S. law provides a marital deduction under Section 2056 that allows a decedent to leave an unlimited amount to a surviving spouse without estate tax. This deduction is available for transfers to U.S. citizen spouses. For non-citizen spouses, Congress created a different vehicle: the Qualified Domestic Trust (QDOT) under Section 2056A.

A QDOT allows a decedent to transfer assets to a trust for the benefit of a non-citizen surviving spouse and obtain the marital deduction — but only if the trust meets specific requirements. The QDOT must have at least one U.S. trustee (a U.S. citizen or domestic corporation) who has the authority to withhold estate tax on any distribution of principal from the trust. Estate tax is then imposed on distributions of principal from the QDOT (other than hardship distributions) and on the QDOT's assets remaining at the surviving spouse's death, at the rate that would have applied to the first decedent's estate.

The QDOT is essentially a tax deferral mechanism — it defers estate tax from the first death to the second, while allowing the assets to remain available for the surviving spouse. It is not an exemption from estate tax, and the tax ultimately comes due on the surviving spouse's death or on distributions of principal. For families where one spouse is a U.S. citizen and the other is not, the QDOT is a critical planning tool, but it must be established and funded in accordance with specific procedural requirements — it cannot be created retrospectively after the first spouse has died without timely post-death action within the estate administration period.

When to Plan — and When It Is Too Late

Estate planning for non-citizen investors has a timing dimension that is unforgiving. The most effective planning involves transferring assets to irrevocable structures while the settlor is healthy, the transfers can be valued accurately, and the structure can operate for a meaningful period before any potential estate tax event. The further from death the planning is done, the more flexibility exists.

Planning becomes more constrained — and in some cases impossible to execute fully — in the following circumstances:

  • Fraudulent transfer risk. Under applicable state law (Florida's Uniform Voidable Transactions Act, for example), a transfer made with actual intent to defraud creditors, or made for less than reasonably equivalent value while the transferor was insolvent, can be set aside by creditors. Transfers to irrevocable trusts in anticipation of a known liability may be challenged as fraudulent transfers — a risk that increases dramatically when the transfer is made in the shadow of financial distress or pending claims.
  • Deathbed planning. Transfers made shortly before death are scrutinized by the IRS under multiple theories — including whether the decedent in fact surrendered control over the transferred property, whether the transfer was complete and final, and whether any implied understanding that the assets would revert to the decedent's estate undermines the structure under Section 2036 or 2038. Incomplete transfers — where the documentation was not finalized, the assets were not retitled, or the settlor continued to use or control the assets — are a significant source of estate tax controversy.
  • Look-back issues. Certain estate planning techniques that involve sales or transfers to grantor trusts, GRATs, or similar structures have implicit look-back periods under which the IRS can challenge the transfer if the settlor dies within a specified window after the transaction. The risk analysis depends on the specific technique and must be evaluated with counsel.
  • Domicile shifts. An investor who becomes a U.S. domiciliary — through establishing a permanent home in the United States with the intent to remain indefinitely — crosses from the non-resident alien estate tax regime (U.S.-situs assets only, $60,000 exemption) to the U.S. domiciliary regime (worldwide assets, full exemption). Planning done before the domicile shift has different consequences and available techniques than planning done after.

The consistent thread in all of these timing issues is that effective planning requires time — time to transfer assets properly, time for structures to season and operate as intended, and time to integrate the estate plan with income tax planning, entity structuring, and home-country legal considerations.

The Role of Legal Counsel

Estate planning for non-citizen investors is a multidisciplinary undertaking. U.S. legal counsel must draft the trust instrument and advise on the estate inclusion analysis, the gift tax implications of any transfers, the grantor trust analysis, and how the structure interacts with U.S. reporting obligations. Where a QDOT is involved, the drafting and funding requirements must be executed precisely.

A U.S. tax accountant or international tax adviser must evaluate the income tax treatment of the trust, the reporting obligations (Form 3520, Form 3520-A, and any entity-level reporting for assets held inside the trust), and the interaction between U.S. estate planning and the family's home-country succession and tax law. In many LATAM jurisdictions, gratuitous transfers to trusts have implications under forced heirship rules, transfer taxes, or exit tax regimes that must be coordinated with local counsel.

For families who have accumulated U.S. assets over time without engaging in formal estate planning, the starting point is an asset inventory — identifying what is U.S.-situs, how it is held, and what the current estate tax exposure would be if the principal owner died tomorrow. The gap between that exposure and the $60,000 exemption is the planning target, and the available tools to address it are well-established under U.S. law. The challenge, as with all estate planning, is executing before the need arises rather than after.