Non-Citizen Spouse Estate Planning: The Marital Deduction Does Not Apply

Updated August 2, 2026. Quick answer: the rule that lets a married couple pass everything to each other free of estate tax — the unlimited marital deduction — does not apply if the surviving spouse is not a US citizen. Not reduced. Not delayed. Denied. Nearly every estate plan is drafted assuming it applies, and where one spouse holds a green card rather than a passport, that assumption fails at the worst possible moment.

If you are a US citizen married to a non-citizen, this is the single most important paragraph on this site for you. The fix exists and is well established, but it has to be put in place before death — or, in one narrow case, before a tax return is filed. Nobody will raise it for you unless they know your spouse’s citizenship, and most drafting conversations never ask.

The denial, in the statute

“Except as provided in paragraph (2), if the surviving spouse of the decedent is not a citizen of the United States— (A) no deduction shall be allowed under subsection (a)”

26 U.S.C. 2056(d)(1)(A)

Residency does not fix it. A green card does not fix it. Decades of marriage do not fix it. The test is citizenship, and only citizenship.

The same denial applies to lifetime gifts. Under § 2523(i)(1), “if the spouse of the donor is not a citizen of the United States … no deduction shall be allowed”. So the usual advice that spouses can move unlimited money between themselves is also wrong here.

When it does not matter

Worth saying early, because the alarm above is not a reason for panic in every household. The federal basic exclusion for 2026 is $15,000,000 per person. An estate comfortably below that owes no federal estate tax whether or not the marital deduction is available, and the denial costs nothing.

Where it bites is estates near or above the exclusion — and, importantly, estates that may grow into it, since the plan is written now and tested decades later. It also matters if the exclusion falls in future, which is a political question nobody can price.

The fix: a qualified domestic trust

The statute provides the exception in one sentence: “Paragraph (1) shall not apply to any property passing to the surviving spouse in a qualified domestic trust.” A QDOT restores the deferral — property passes into the trust, the deduction is allowed, and the tax waits.

Three requirements define it, and the second is the one that gives the trust its teeth:

• A US trustee. The trust must require “that at least 1 trustee of the trust be an individual citizen of the United States or a domestic corporation”.
• A withholding right. No distribution “(other than a distribution of income)” may be made unless that trustee “has the right to withhold from such distribution the tax imposed by this section”. The US trustee exists precisely so the tax cannot leave the country unpaid.
• An election. QDOT treatment applies only where “an election under this section by the executor of the decedent applies to such trust”. It is not automatic, and the person who must make it is your executor, after you are gone.

What the trust taxes, and what it does not

The tax is deferred, not forgiven. It falls on “any distribution before the date of the death of the surviving spouse” and on “the value of the property remaining … on the date of the death of the surviving spouse”.

But the exceptions are what make a QDOT livable, and they are frequently omitted:

So a surviving spouse can live on the trust’s income indefinitely without triggering anything. The tax arrives only when principal moves, or at the end. That is a materially more comfortable arrangement than the phrase “the tax is only deferred” suggests.

The other fix: citizenship — and its two different deadlines

If the surviving spouse becomes a US citizen, the problem can disappear. But the statute sets two different clocks, and confusing them is expensive.

To avoid needing a QDOT at all, the denial does not apply where the surviving spouse “becomes a citizen of the United States before the day on which the return of the tax imposed by this chapter is made” — together with a residency condition running from the date of death. That is a hard, short deadline measured against the estate tax return.

Once property is already in a QDOT, the relief is far more forgiving. Where the spouse later becomes a citizen and meets one of three statutory conditions, the lifetime tax “shall not apply to any distributions after such spouse becomes such a citizen”, and the tax at death does not apply either. This one is not tied to the return deadline — it can happen years afterwards.

The practical reading: naturalisation before the return is filed is a clean escape and rarely achievable on that timetable. Naturalisation later still unwinds most of the burden, provided the QDOT was put in place. Which is an argument for creating the trust even where citizenship is expected.

The lifetime move most affected couples should know about

Because the gift deduction is denied, the Code substitutes a much larger annual exclusion — § 2523(i)(2) applies the ordinary annual-exclusion rule “by substituting ‘$100,000’ for ‘$10,000’”, indexed since. For 2026 the figure is $194,000.

So a US-citizen spouse may transfer up to $194,000 to a non-citizen spouse in 2026 without it counting as a taxable gift, and may do so again each year. Over a long marriage that moves a great deal of value out of the citizen spouse’s estate and into the hands of the person the plan was trying to protect — without a trust, without an executor, and without a deadline measured in months. It is the least complicated tool available here and the most consistently overlooked. How the annual exclusion works generally covers the ordinary version.

What we are not going to tell you

Whether a bilateral estate or gift tax treaty changes any of this for your particular countries. Several such treaties exist and some materially alter these outcomes. That is treaty-dependent, it turns on which countries are involved and on the individual facts, and it is exactly the kind of question where a general article does damage. Anyone in this position needs a lawyer who does cross-border estate work — not because it is complicated in principle, but because the interaction is specific to you.

What to do this month

Establish citizenship status, on paper, for both spouses. A surprising number of couples are unsure, and green-card holders are frequently assumed to be citizens by the people drafting their documents.

Compare the estate against $15,000,000. Below it by a wide margin, this is a watching brief. Near or above it, it is urgent.

Consider starting the annual transfers. $194,000 a year, beginning now, is available without any instrument at all.

Then the wider estate work, which does not change: designations control, not the will, and what marriage itself does to retirement beneficiaries.

Denial from 26 U.S.C. § 2056(d)(1)(A); the QDOT exception from § 2056(d)(2)(A); trust requirements from § 2056A(a); tax triggers and the income and hardship exceptions from § 2056A(b)(1) and (b)(3); the citizenship provisions from §§ 2056(d)(4) and 2056A(b)(12); the gift-side denial and substituted exclusion from § 2523(i). The $194,000 figure for 2026 is from Rev. Proc. 2025-32 § 4.42(2) and the $15,000,000 exclusion from § 2010(c)(3). Read August 2026. General information, not legal or tax advice — and this is a situation that genuinely needs a professional.