Two US citizens can pass unlimited wealth between each other, during life and at death, without a dollar of federal gift or estate tax. That unlimited marital deduction is the backbone of ordinary married-couple planning. It quietly disappears the moment one spouse is not a US citizen, and the couples it affects almost never see it coming, because nothing about the marriage, the green card, or the joint tax return signals that the rule has changed.
Why Is There No Unlimited Marital Deduction for a Noncitizen Spouse?
Because Congress worried the deduction would let untaxed wealth leave the country. The marital deduction defers estate and gift tax, it does not forgive it, on the theory that whatever passes to the surviving spouse is taxed in that spouse's own estate later. A noncitizen spouse, the reasoning goes, could take the assets and expatriate, and the United States might never collect the deferred tax. So IRC §2523(i)(1) turns off the deduction for lifetime gifts to a noncitizen spouse and IRC §2056(d)(1) turns it off for transfers at death.
This is a rule about the recipient spouse's citizenship, applied to the donor or decedent who is a US person. It is a distinct problem from the one facing a nonresident alien who owns US assets. Here the person with the exposure is typically a US citizen or a US domiciliary with the full $15 million exemption, and the wrinkle is simply that the ordinary spousal deduction they would rely on does not apply to their marriage.
Two points catch people off guard. First, the rule does not care whether the couple lives in the United States or abroad, whether they file jointly, or whether the noncitizen spouse is a long-term green card holder. Second, the deduction is not reduced or capped, it is fully unavailable, replaced for lifetime gifts by a specific annual exclusion and at death by the QDOT mechanism.
How Much Can You Give a Noncitizen Spouse Tax-Free in 2026?
For 2026 you can give a noncitizen spouse up to $194,000 in present-interest gifts without gift tax, under the enlarged annual exclusion in IRC §2523(i)(2). That figure was $190,000 for 2025 and rose to $194,000 for 2026 under Rev. Proc. 2025-32. It is separate from, and roughly ten times larger than, the ordinary $19,000 §2503(b) annual exclusion that applies to gifts to any other person.
The statute builds this number by substituting $100,000 for $10,000 in the §2503(b) annual exclusion rule, then indexing that $100,000 base for inflation. That is why the published amount climbs each year and why you must confirm the current figure in the IRS revenue procedure for the year of the gift rather than reusing a prior year's number. Using the stale $190,000 in 2026 understates the exclusion by $4,000 per year of transfers.
The enlarged exclusion is generous but it is still an annual number, not the unlimited deduction citizen couples enjoy. A US citizen who wants to equalize a $3 million estate with a noncitizen spouse cannot simply retitle the assets. Moving that much into the spouse's name outright would take many years of $194,000 exclusions, and any excess in a single year is a taxable gift that consumes lifetime exemption. This is exactly why lifetime equalization for mixed-nationality couples is paced against the annual exclusion, not done in one stroke.
Does the Rule Depend on Residency, Domicile, or Green Card Status?
No. The marital deduction rules in §2523(i) and §2056(d) turn on citizenship and nothing else. A spouse who holds a green card, lives full-time in the United States, files a joint return, and is a US person for income tax is still a noncitizen for this purpose. The unlimited deduction stays off until the day that spouse naturalizes.
This is a common trap because the couple has every reason to believe they are treated identically. They may have made the election to file jointly as residents for income tax, they may both report worldwide income, and the noncitizen spouse may be fully subject to US estate tax on their own worldwide assets as a domiciliary. All of that is true, and none of it grants the marital deduction. The estate and gift tax draw a line at the passport that the income tax does not.
The distinction runs the other way too. It does not matter whether the donor or decedent is domiciled here, so long as they are the US person making the transfer. And it is worth separating this from the entirely different fact pattern where the person with US assets is themselves the noncitizen. If it is the nonresident alien who owns the US property and dies, the governing regime is Form 706-NA and the $60,000 exemption equivalent, a separate article, because there the deceased is the noncitizen rather than the recipient.
Citizenship, Not Residency, Controls the Deduction
Reference- Lifetime gifts: IRC §2523(i)(1) denies the marital deduction for a gift to a noncitizen spouse. §2523(i)(2) substitutes the enlarged annual exclusion ($194,000 for 2026).
- At death: IRC §2056(d)(1) denies the marital deduction for property passing to a surviving spouse who is not a US citizen, unless it passes to a §2056A QDOT.
- Irrelevant to both: the noncitizen spouse's green card, US residency, domicile, joint-filing election, or presence in the country.
- Relevant only: whether the recipient spouse holds US citizenship at the operative moment, the date of the gift or the date of death (as extended by the naturalization rules below).
- Who has the exposure: usually the US-citizen or US-domiciliary spouse, who has the full $15,000,000 exemption but not the spousal deduction.
What Happens at Death Without Planning?
Without a QDOT or a citizen surviving spouse, property left outright to a noncitizen spouse gets no marital deduction and is fully taxable in the first spouse's estate to the extent it exceeds the available exemption. For a couple well under the $15 million exemption this may cost nothing in federal tax, and the deduction denial is a non-event. The exposure appears when the combined estate is large, when one spouse holds most of the assets, or when a state estate tax with a far lower threshold is in play.
Consider a US citizen with an $18 million estate and a noncitizen spouse. Leaving everything outright to the spouse, a citizen couple would owe zero at the first death because of the unlimited marital deduction, deferring all tax to the survivor. This couple cannot. The amount above the decedent's $15 million exemption, $3 million, is exposed at the first death, generating roughly $1.2 million of federal estate tax at the 40 percent marginal rate, unless the excess is routed into a QDOT. The QDOT does not erase that tax, it defers it to the surviving spouse's death or to earlier principal distributions, which for a family that needs the deferral is the difference between a liquidity crisis and an orderly plan.
What Is a QDOT and What Are Its Requirements?
A qualified domestic trust under IRC §2056A is a trust that restores the estate tax marital deduction for property passing to a noncitizen surviving spouse. The property passes into the QDOT rather than outright to the spouse, the estate claims the deduction, and the trust then acts as a collection mechanism: a US trustee must be positioned to withhold the deferred §2056A estate tax whenever principal is distributed. The core statutory requirements are that the instrument require at least one trustee to be a US citizen or domestic corporation, that no corpus distribution be made unless that US trustee has the right to withhold the §2056A tax, that the trust meet the regulatory collection-security rules, and that the executor make an irrevocable QDOT election on the estate tax return.
The collection-security rules in Treas. Reg. §20.2056A-2(d) apply to every QDOT, not only large ones, and they scale with the trust's size. Where the fair market value of the trust assets exceeds $2 million, the trust must have a US bank as trustee, or furnish a bond or letter of credit equal to 65 percent of the value. Where the value is $2 million or less, the instrument is still not excused: it must provide either that no more than 35 percent of the fair market value of the trust assets, determined annually, will consist of real property located outside the United States, or that the trust will meet those same US-bank-trustee, bond, or letter of credit requirements. In testing against the $2 million threshold, the executor may elect to exclude up to $600,000 attributable to a personal residence and related furnishings owned directly by the QDOT and used by the surviving spouse.
How Is a QDOT Taxed, and Does It Ever End?
A QDOT buys timing, not forgiveness. Income distributions to the surviving spouse are free of the §2056A tax, but distributions of principal during the spouse's life trigger the deferred estate tax at the first decedent's marginal rate, and whatever remains in the trust at the spouse's death is taxed then. The one relief valve on lifetime principal is the regulatory hardship exception for an immediate and substantial need relating to health, maintenance, education, or support where other resources are not reasonably available.
The regime can also end early through naturalization. If the surviving spouse becomes a US citizen and any one of the three alternative conditions in §2056A(b)(12) is met, the QDOT tax stops applying to later events. Those conditions are that the spouse was a US resident at all times between the decedent's death and naturalization, or that no §2056A tax was imposed on any distribution before naturalization, or that the spouse elects to treat prior taxable distributions as taxable gifts. Only the first is a strict residency test, so a spouse who spent time abroad is not automatically shut out. This makes the surviving spouse's citizenship timeline a genuine planning variable, not an afterthought.
Can the Surviving Spouse Avoid a QDOT Entirely?
Yes, if the spouse naturalizes fast enough. IRC §2056(d)(4) allows the ordinary marital deduction with no QDOT when the surviving spouse becomes a US citizen before the day the estate tax return is filed, provided the spouse was a US resident at all times after the decedent's death and before becoming a citizen. Meet both conditions and the property is treated as passing to a citizen spouse, and the unlimited deduction applies as if the citizenship gap had never existed.
The practical constraint is the calendar. The estate tax return is generally due nine months after death, extendable six months on Form 4768, so the outside window to complete naturalization is roughly fifteen months. Naturalization on that timeline is rarely realistic for someone starting from scratch, but for a long-term green card holder already eligible to apply, it can be the cleanest possible outcome, eliminating the trust, the trustee, and the deferred tax in one step. Where the spouse is close to eligibility, filing the estate tax extension to preserve the maximum window is itself a planning move.
How Does This Differ When the Donor Is a Nonresident Alien?
When the person making the transfer is a nonresident alien rather than a US citizen, the analysis flips almost entirely. A nonresident alien donor is subject to US gift tax only on US-situated real property and tangible personal property, and IRC §2501(a)(2) puts gifts of intangible property, including US corporate stock, outside the US gift tax altogether. So an NRA can often give US shares to anyone, including a noncitizen spouse, with no US gift tax, which makes the §2523(i) enlarged exclusion largely beside the point for those intangibles.
The point where the two regimes converge is the estate tax at death and the QDOT. Section 2056(d)'s denial of the marital deduction and the §2056A QDOT requirement apply whenever the surviving spouse is not a US citizen, whether the deceased spouse was a US citizen with a $15 million exemption or a nonresident alien with only the $60,000 exemption equivalent delivered through the $13,000 credit. In the NRA case the QDOT protects a much smaller deductible base, but the mechanics are the same. The full mechanics of the nonresident side, situs, the $60,000 threshold, and Form 706-NA, are covered in our companion piece on the nonresident-alien estate tax; if the covered-expatriate rules could apply to either spouse, see our guide to expatriation and Form 8854.
Two Different Fact Patterns, One Shared QDOT Rule
Important- US citizen donor, noncitizen spouse (this article): full $15,000,000 exemption, but no unlimited marital deduction. Lifetime gifts capped at the $194,000 (2026) enlarged exclusion before touching exemption; bequests need a QDOT.
- Nonresident alien donor, noncitizen spouse: gifts of US intangibles (stock) escape gift tax under §2501(a)(2), so the §2523(i) exclusion rarely bites; but the estate side still needs a QDOT for US-situs property, against only a $60,000 exemption equivalent.
- The constant: §2056(d) and the §2056A QDOT apply whenever the surviving spouse is not a US citizen, regardless of the decedent's status.
- Not the same as receiving a foreign gift: a US person who receives a large gift from a foreign spouse or relative may owe no tax but must report it on Form 3520 above the threshold. That is an information return, a separate obligation from the transfer tax discussed here.
What Are the Practical Planning Moves for Mixed-Nationality Couples?
The toolkit is different from an all-citizen couple's, and it rewards starting early. Because the marital deduction cannot do the heavy lifting during life, planning leans on the enlarged annual exclusion, on the couple's individual exemptions, and on the QDOT as the death-time backstop.
None of these moves is exotic, but each depends on a fact that ordinary married-couple planning ignores: the citizenship of the recipient spouse. A plan drafted for two citizens, dropped onto a mixed-nationality couple, silently loses the marital deduction and can expose seven figures to a 40 percent tax that the couple assumed was deferred. The fix is to design for the citizenship gap from the outset rather than to discover it in the nine months after a death.
Bottom Line
The unlimited marital deduction is the one assumption a mixed-nationality couple cannot safely make. IRC §2523(i) removes it for lifetime gifts and hands back an enlarged annual exclusion, $194,000 for 2026 under Rev. Proc. 2025-32, that is generous but finite. IRC §2056(d) removes it at death and replaces it with the §2056A QDOT, a trust that defers the tax through a US trustee rather than forgiving it, and that carries mandatory security terms at every size, not only above $2 million. The trigger is citizenship, so a green card holder living in the United States still counts as a noncitizen for these rules, and the cleanest exit, the surviving spouse naturalizing before the estate tax return is filed under §2056(d)(4), runs against a nine-to-fifteen-month clock. When the donor is instead a nonresident alien, gifts of US intangibles escape gift tax entirely under §2501(a)(2), but the QDOT requirement at death is the same. Design for the citizenship of the recipient spouse from the start, because a plan built for two citizens quietly fails for this marriage.
If you are a US citizen married to a noncitizen, a nonresident alien with US assets and a noncitizen spouse, or an executor administering an estate that passes to a noncitizen surviving spouse, our estate and trust tax and international tax teams size the exposure, structure the QDOT and the lifetime gifting, and coordinate any naturalization timeline. Have questions about gifts or bequests to a noncitizen spouse? Contact TS CPA for a free consultation. We respond within the same day.
Official IRS and Government Sources
- IRS: Frequently Asked Questions on Gift Taxes for Nonresidents Not Citizens of the United States
- IRS: Estate Tax for Nonresidents Not Citizens of the United States
- IRS Instructions for Form 706 (marital deduction and QDOT, Schedule M)
- IRC Section 2523, Gift to Spouse (see subsection (i))
- IRC Section 2056, Bequests to Surviving Spouse (see subsection (d))
- IRC Section 2056A, Qualified Domestic Trust
- IRC Section 2503, Taxable Gifts (annual exclusion)
- IRC Section 2501, Imposition of Gift Tax (see 2501(a)(2))
- Treasury Regulation 20.2056A-2, Requirements for Qualified Domestic Trust
- IRS Revenue Procedure 2025-32 (2026 inflation adjustments)