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.

A Qualified Domestic Trust defers the estate tax. An offshore trust addresses a second risk, creditor claims against the couple’s assets. 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. That rule, the unlimited marital deduction, 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, a figure the One Big Beautiful Bill Act set with no expiration date. The exemption is indexed for inflation starting in 2027. 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 assets passing to the trust exceed $2 million at the first spouse’s death, a U.S. bank must be one of the trustees. The alternative is a bond or letter of credit equal to 65% of that value. The trust must be maintained under the law of a U.S. state or the District of Columbia, and its administration must be governed by that law.

A QDOT defers estate tax but 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. Distributions of income do not trigger that estate tax. A hardship distribution is also exempt, but only for an immediate and substantial need relating to health, maintenance, education, or support that the spouse cannot meet from other available assets.

A QDOT is not an asset protection structure. The trust is administered under state law with a U.S. trustee, so it sits within the reach of U.S. courts. A spendthrift clause can still bar a creditor of the surviving spouse from reaching that spouse’s interest before the spouse receives a distribution, provided the deceased spouse funded the trust. That protection is lost if the surviving spouse instead funds the QDOT with property inherited outright, because the trust is then self-settled.

What an Offshore Trust Adds

An offshore trust solves a different problem than a QDOT. It protects assets from creditors, keeps ownership off the public record, and separates the assets from the U.S. legal system.

A Cook Islands trust places assets under a foreign trustee outside the jurisdiction of U.S. courts. A creditor cannot enforce a U.S. judgment there directly and must sue again under Cook Islands law. That claim needs proof beyond a reasonable doubt of both an intent to defraud the creditor and a disposition that left the settlor without property to satisfy it.

Two deadlines also cut the claim off: two years from the date the creditor’s claim arose, and one year from the transfer date when the claim came first. Those defenses have been tested in contested litigation since the late 1990s, and no creditor is known to have recovered assets from a properly structured trust.

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. The same structure fits American expats whose assets are already spread across countries.

Couples weighing a move abroad also face the U.S. exit tax, which treats a covered expatriate’s worldwide assets as sold the day before citizenship ends.

Cook Islands trusts cost about $21,000 to establish and about $5,000 per year in trustee fees once the trust is running. 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. That contribution can come from separate funds, traced gifts, or independent earnings. Without documentation showing the non-citizen spouse paid their share, the full value of a jointly held home or investment account could be taxed in the first estate.

Retitling assets into an offshore trust removes the tracing 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 bind the courts of the country that imposes them, and they reach real property located there. A U.S. citizen who owns real property in France can run into the French reserve, which sets aside part of an estate for the children and can override a will.

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.

An offshore trust protects liquid assets (cash, securities, business interests). Real property located in a foreign country remains subject to that country’s rules regardless of any trust structure.

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 have to deal 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 it has U.S. beneficiaries. 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. All of this compliance work sits with the accountant.

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.

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 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 case for the offshore trust holds either way, so 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.