Offshore Trusts and Non-Citizen Spouses

A U.S. citizen married to a non-citizen faces estate tax rules that do not apply when both spouses hold citizenship. The unlimited marital deduction allows a citizen to leave any amount to a surviving citizen spouse free of federal estate tax. That deduction does not apply when the surviving spouse is not a U.S. citizen, even if that spouse holds a green card.

An offshore trust addresses the asset protection side of this problem while a Qualified Domestic Trust handles the estate tax deferral. Cross-border couples whose assets already span multiple countries need both structures working together, because neither domestic asset protection nor standard estate planning covers both risks alone.

The Marital Deduction Problem

Federal estate tax law allows a surviving U.S. citizen spouse to inherit an unlimited amount without triggering estate tax. This unlimited marital deduction is one of the most valuable provisions in the tax code for married couples. It does not apply when the surviving spouse is not a U.S. citizen, regardless of immigration status or how long the non-citizen spouse has lived in the United States.

Without the marital deduction, the deceased spouse’s estate owes tax on assets above the federal exemption. In 2026, the exemption is $15 million per individual, and the One Big Beautiful Bill Act made this amount permanent with annual inflation adjustments. Assets above the exemption are taxed at 40%. For couples whose combined estates exceed the exemption, the tax at the first death can be substantial.

The annual gift tax exclusion also changes for non-citizen spouses. Transfers between citizen spouses are unlimited, with no gift tax regardless of amount. Transfers to a non-citizen spouse are capped at $194,000 per year in 2026. Gifts above that amount count against the lifetime estate and gift tax exemption.

How a QDOT Works and Where It Falls Short

A Qualified Domestic Trust (QDOT) is the standard solution for deferring estate tax when the surviving spouse is not a U.S. citizen. The QDOT holds assets that would otherwise be immediately taxed at the first spouse’s death. Estate tax is deferred until the surviving spouse receives distributions from the trust or dies.

QDOT requirements are strict. At least one trustee must be a U.S. citizen or U.S. corporation. If the trust holds more than $2 million, either a U.S. bank must be the trustee or the trustee must furnish a bond or letter of credit equal to 65% of the trust’s value. The trust must be established under U.S. law and governed by U.S. courts.

A QDOT defers estate tax. It does not eliminate it. Every distribution of principal to the surviving spouse triggers estate tax at the rate that applied at the first spouse’s death. Only distributions of income are tax-free. The surviving spouse cannot simply withdraw principal without a tax consequence, unless the distribution qualifies as a hardship distribution for health, education, or support.

A QDOT provides no creditor protection. Because the trust is governed by U.S. law and managed by a U.S. trustee, it is fully within the reach of U.S. courts. A creditor with a judgment against either spouse can pursue QDOT assets through standard domestic enforcement procedures.

What an Offshore Trust Adds

An offshore trust solves a different problem than a QDOT. A QDOT defers estate tax. An offshore trust protects assets from creditors, provides financial privacy, and creates jurisdictional separation from the U.S. legal system. The two structures work in parallel: one handles estate tax, the other handles lawsuit risk.

A Cook Islands trust places assets under a foreign trustee outside the jurisdiction of U.S. courts. Creditors must pursue enforcement in the Cook Islands, where they face a beyond-a-reasonable-doubt burden of proof and a one-to-two-year statute of limitations on fraudulent transfer claims. No creditor has successfully recovered assets from a properly structured Cook Islands trust through Cook Islands litigation.

For cross-border couples, the offshore trust also addresses a practical concern. When one spouse is not a U.S. citizen, the couple’s financial life often already spans two countries. The non-citizen spouse may hold bank accounts, real property, or business interests in their home country. An offshore trust can hold the couple’s liquid assets in a single structure that protects against creditors in both the U.S. and the spouse’s country of citizenship. American expats whose financial lives already span multiple countries often find offshore trust planning a natural extension of existing arrangements.

Cook Islands trusts cost $20,000 to $25,000 to establish and $5,000 to $8,000 per year to maintain. These costs apply regardless of marital status or the citizenship of either spouse.

Joint Property Titling and the Contribution Problem

Joint ownership between spouses creates an additional tax risk when one spouse is not a U.S. citizen. Between citizen spouses, jointly held property is presumed owned 50/50 for estate tax purposes. That presumption does not apply when one spouse is a non-citizen.

When the citizen spouse dies, the IRS presumes that 100% of any jointly held property belongs to the deceased spouse’s taxable estate. The surviving non-citizen spouse must prove their own financial contribution to the property to reduce that inclusion. Without documentation showing the non-citizen spouse paid their share, whether through separate funds, traced gifts, or independent earnings, the full value of jointly held homes, investment accounts, and other assets could be taxed in the first estate.

Retitling assets into an offshore trust removes this problem for protected liquid assets. The trust holds the assets independently, and the trust deed defines how they pass at death. No contribution tracing is required because the trustee holds legal title.

Forced Heirship and Foreign Inheritance Rules

Many countries outside the United States impose forced heirship rules that override the deceased person’s stated wishes. Civil law jurisdictions across Europe, Latin America, and parts of Asia entitle children and surviving spouses to fixed shares of the estate. A will that leaves everything to one person may be partially void under local law.

Forced heirship rules apply to assets located within the country’s jurisdiction. A U.S. citizen who owns real property in France cannot simply will that property to anyone—French law reserves a portion for the children regardless of what the will says.

An offshore trust can insulate liquid assets from forced heirship claims by holding them in a jurisdiction that does not recognize those rules. Cook Islands law does not apply forced heirship to trusts governed under its statutes. Assets held in the trust pass according to the trust deed, not according to the inheritance laws of the non-citizen spouse’s home country.

Real property located in a foreign country remains subject to that country’s rules regardless of any trust structure. The offshore trust protects liquid assets—cash, securities, business interests—not real estate held in forced heirship jurisdictions.

Multi-Country Probate

When a person dies holding assets in multiple countries, each country’s probate system may assert jurisdiction over locally held assets. The result is parallel proceedings with different timelines, different rules, and different outcomes. A surviving non-citizen spouse may need to retain attorneys in two or three countries to access jointly held assets.

An offshore trust avoids multi-country probate for the assets it holds. The trustee distributes assets according to the trust deed without court involvement. No probate filing is required in any jurisdiction. This is particularly valuable when the surviving spouse lives outside the United States and would otherwise need to engage with the U.S. probate system from abroad.

IRS Reporting for the U.S. Citizen Spouse

The U.S. citizen spouse who creates and funds the offshore trust bears all reporting obligations. The IRS treats the trust as a grantor trust under IRC Section 679 because a U.S. person funded it and U.S. beneficiaries exist. All trust income appears on the U.S. citizen’s personal return. The trust does not create a separate tax liability or defer income.

Required forms include Form 3520, reporting transactions with the foreign trust, and Form 3520-A, the trust’s annual information return. FBAR filing applies if foreign accounts connected to the trust exceed $10,000 in aggregate value. FATCA reporting on Form 8938 applies above the standard filing thresholds. The accountant handles all ongoing tax compliance, not the attorney or the trustee.

The non-citizen spouse has no U.S. reporting obligation for the trust unless that spouse is also a U.S. tax resident. A non-citizen, non-resident spouse named as a trust beneficiary does not file U.S. trust reporting forms solely because of the beneficiary designation.

Strategic Lifetime Gifting

The $194,000 annual gift exclusion for non-citizen spouses resets every year, making it a tool for gradually shifting assets between spouses during life. Over ten years, a citizen spouse can transfer nearly $2 million to a non-citizen spouse without using any lifetime exemption or triggering a gift tax return.

Strategic gifting reduces the assets that would otherwise need to pass through a QDOT at the first death. It also moves future appreciation on those assets outside the citizen spouse’s taxable estate. For couples where the citizen spouse holds substantially more wealth, annual gifting is a straightforward complement to both QDOT and offshore trust planning.

Direct payments for tuition or medical expenses on behalf of a non-citizen spouse do not count against the $194,000 exclusion. These payments must go directly to the institution, not to the spouse, to qualify.

When This Planning Makes Sense

An offshore trust paired with QDOT planning fits couples where the U.S. citizen holds substantial liquid assets and the couple faces creditor exposure in the U.S. or the non-citizen spouse’s home country. The QDOT component adds value when the combined estate is large enough that losing the marital deduction creates real tax exposure.

The asset protection rationale applies at the same thresholds as any other offshore trust, generally $1 million or more in total assets or $500,000 or more in liquidity. The QDOT component becomes relevant when the combined estate approaches the federal exemption, currently $15 million per individual. If the non-citizen spouse is pursuing U.S. citizenship, the QDOT may become unnecessary once citizenship is granted. The asset protection rationale for the offshore trust remains regardless, and planning should not wait for a citizenship timeline that may change.

The planning also protects the next generation by consolidating liquid assets in a single structure that avoids multi-country probate and overrides forced heirship claims on movable property.