In a city as international as New York, it's common for one spouse to hold a green card or a work visa while the other has become a naturalized citizen — or for neither spouse to be a U.S. citizen at all. I see this pattern constantly in my practice: successful, well-organized couples who assume that basic estate planning rules apply to them the same way they'd apply to any other married couple. Then I have to deliver the surprise. If your spouse is not a U.S. citizen, the federal government treats your estate very differently when you die, and without the right planning tool in place, that difference can mean a tax bill your family never expected. That tool is called a Qualified Domestic Trust, or QDOT, and understanding how it works is essential for any estate planning strategy involving a non-citizen spouse. If you haven't already, it's also worth reading our companion piece on estate planning for immigrant families in New York, which covers some of the broader issues international families face here.
Why Non-Citizen Spouses Don't Get the Unlimited Marital Deduction
Most married couples in the United States benefit from what's called the unlimited marital deduction under Internal Revenue Code Section 2056. In plain terms, this rule allows one spouse to leave an unlimited amount of assets to the other spouse at death without triggering any federal estate tax. It's the reason so many married couples never think twice about estate tax at the first death — the tax simply doesn't apply, because everything passes to the surviving spouse tax-free, with the tax question deferred until the second spouse dies.
Here's the surprise: that unlimited marital deduction is not available when the surviving spouse is not a United States citizen — even if that spouse is a lawful permanent resident with a green card, has lived in the U.S. for decades, and files joint tax returns every year. Citizenship, not residency, is what the law cares about. Congress created this rule out of concern that a non-citizen surviving spouse could receive property tax-free and then leave the country, taking assets beyond the reach of the IRS with no future opportunity to collect estate tax on the family's wealth. Whether or not that concern feels realistic in any individual family's situation, it is the rule as written, and it applies automatically unless you plan around it.
What Is a QDOT?
A Qualified Domestic Trust, authorized under IRC Section 2056A, is the mechanism Congress built to solve this problem. Rather than losing the marital deduction outright, a married couple can direct that the non-citizen spouse's inheritance pass into a properly structured QDOT instead of directly to that spouse. Assets funding a valid QDOT still qualify for marital deduction treatment at the first spouse's death, which means no federal estate tax is due immediately.
It's important to understand what a QDOT actually accomplishes, because it's often misunderstood. A QDOT does not eliminate federal estate tax — it defers it. The tax that would have been due at the first spouse's death is postponed until the trust principal is eventually distributed to the surviving non-citizen spouse, or until that surviving spouse dies, at which point the deferred tax is generally paid out of the trust. In the meantime, the surviving spouse can typically receive income generated by the trust assets and, in many cases, live off of and benefit from the trust much as they would have if they'd inherited outright. For background on how the federal estate tax system works more broadly, the IRS estate tax guidance is a useful primer, though it does not substitute for individualized legal advice given how fact-specific this area is.
A QDOT can be created in one of two ways. The deceased spouse's will or revocable trust can direct that a QDOT be established automatically for the non-citizen spouse's share at death, or in some circumstances the surviving spouse can create and fund a QDOT with assets they've already received, though this must generally happen before the estate tax return is filed. I almost always recommend building the QDOT provision directly into the estate plan in advance, since scrambling to create one after a death — while grieving, and often while relatives abroad are also involved — is far harder than planning for it calmly ahead of time.
QDOT Trustee and Bonding Requirements
A QDOT isn't just any trust with the right label attached to it — it has to meet specific structural requirements to qualify, and the IRS enforces these carefully because the entire point of the trust is to preserve the government's ability to eventually collect the deferred tax.
First, at least one trustee of the QDOT must be a United States citizen or a domestic corporation, such as a U.S. bank or trust company. This requirement exists because that U.S. trustee is responsible for withholding and remitting the deferred estate tax to the IRS when a taxable distribution occurs. A trustee who lives abroad or a foreign institution cannot fill this role.
Second, if the QDOT holds more than $2 million in assets, the rules get more demanding. In that case, the U.S. trustee generally must be a bank, or alternatively the trust must furnish a bond or an irrevocable letter of credit to the IRS in an amount sufficient to secure eventual payment of the deferred tax. This bonding requirement is designed to protect the government's interest in a larger trust where the eventual tax liability could be substantial. Couples with more modest QDOTs have more flexibility in who can serve as trustee, but larger estates need to plan around this requirement specifically, often by naming an institutional trustee from the outset rather than trying to retrofit a bond later.
Income vs. Principal: How Distributions Are Taxed
One of the most practical questions I get from clients is what the surviving spouse can actually do with QDOT assets day to day, and the answer depends entirely on whether we're talking about income or principal.
Distributions of income earned by the QDOT — interest, dividends, rental income, and similar returns generated by the trust's assets — can generally be paid out to the surviving non-citizen spouse without triggering the deferred estate tax. This is by design: the surviving spouse is meant to be able to live on the trust's income much as they would have lived on the inherited assets directly.
Distributions of principal are a different story entirely. Any distribution of QDOT principal to the surviving spouse generally triggers the deferred federal estate tax at the time of that distribution, calculated on the amount distributed. There is a narrow exception for distributions made on account of demonstrated hardship, typically tied to the surviving spouse's health, maintenance, or support needs, but this exception is applied carefully and isn't a loophole for routine withdrawals. Trustees need to document hardship distributions carefully, because the IRS can scrutinize whether a given withdrawal genuinely qualifies. Families should go into this arrangement understanding that the QDOT is meant to preserve principal for the eventual tax, not to function as an unrestricted account the surviving spouse can draw down freely.
Lifetime Gifts to a Non-Citizen Spouse
The citizenship rule doesn't only affect what happens at death — it also affects lifetime giving between spouses. Just as the unlimited marital deduction doesn't apply to transfers at death to a non-citizen spouse, the unlimited marital deduction for lifetime gifts between spouses doesn't apply either. If your spouse isn't a citizen, you can't simply give them unlimited assets during your lifetime free of gift tax the way citizen spouses can.
To soften this, Congress created an enhanced annual gift tax exclusion specifically for gifts to a non-citizen spouse. This amount is substantially higher than the ordinary annual gift tax exclusion available for gifts to anyone else, and it's adjusted for inflation each year. For 2025, this enhanced exclusion was $190,000, meaning a citizen spouse could give a non-citizen spouse up to that amount during the year without using any lifetime gift and estate tax exemption or filing a gift tax return. This figure changes annually, so couples relying on lifetime gifting as part of their planning should confirm the current year's amount rather than assuming last year's number still applies.
Becoming a Citizen Can Change Everything
There's a meaningful escape hatch built into these rules: if the surviving non-citizen spouse becomes a United States citizen, the entire QDOT analysis can change. Specifically, if the surviving spouse becomes a citizen before the deceased spouse's federal estate tax return (Form 706) is filed, the QDOT requirement can potentially be avoided altogether, or if a QDOT has already been established, it may be possible to terminate it and restore normal unlimited marital deduction treatment as though the citizenship issue never existed.
This timing matters enormously. Form 706 generally must be filed within nine months of death, with a possible six-month extension, which gives a surviving spouse who is already in the naturalization process a real but limited window. I've had clients whose spouse was already partway through the citizenship process at the time of a death, and coordinating with immigration counsel to understand realistic timing became just as important as the tax planning itself. For couples where one spouse is a permanent resident and citizenship seems plausible in the coming years, it's worth discussing that timeline honestly as part of the overall estate plan, since it may reduce or eliminate the need for QDOT machinery entirely.
The New York Estate Tax Trap Inside a QDOT
This is the part of QDOT planning that most catches families off guard, and I want to flag it clearly: a QDOT defers the federal estate tax, but it does nothing for New York's separate state estate tax. New York has its own estate tax system with its own exemption amount, and critically, New York does not offer any equivalent to the QDOT or any comparable deferral mechanism for non-citizen spouses.
Key planning point: Successfully deferring federal estate tax through a QDOT does not mean no estate tax is due at the first spouse's death. If the estate's value exceeds New York's estate tax exemption, New York estate tax can still be owed at that time, in cash, even while the federal tax sits deferred inside the QDOT. Families who focus only on the federal picture are frequently blindsided by a New York tax bill they didn't plan liquidity for.
This mismatch between federal deferral and immediate New York liability is one of the most important reasons this area of planning requires coordinated attention to both systems simultaneously, not just a federal-focused plan borrowed from a couple where both spouses happen to be citizens. An estate that would owe nothing at the first death if both spouses were citizens can still generate a real New York tax bill when one spouse isn't, precisely because the QDOT only solves half the problem. We go into New York's separate exemption structure and its own quirks, including its notorious "cliff" effect, in more detail in our explanation of the New York estate tax, and I'd strongly encourage any couple in this situation to review it alongside this article. Our estate tax planning team routinely models both the federal and New York consequences together before finalizing a QDOT structure, precisely because looking at only one system gives an incomplete and sometimes dangerously misleading picture.
Building This Into Your Estate Plan Now
QDOT planning is not something to leave until a health crisis forces the issue. Because a QDOT provision is typically built into a will or revocable trust — directing that the non-citizen spouse's share automatically fund a properly structured trust at death — the best time to put this in place is well before either spouse's death, while both spouses are healthy and thinking clearly about long-term goals. Waiting until after a death to try to assemble a QDOT, choose a qualifying trustee, and arrange any necessary bond is far more stressful and leaves much less room for careful decision-making.
If you or your spouse is not a U.S. citizen, this is a conversation worth having now with an attorney who works regularly across both federal and New York estate tax rules, not just one or the other. Our wills and trusts practice regularly drafts QDOT provisions into estate plans for international and immigrant families throughout New York City, coordinating trustee selection, bonding requirements where applicable, and New York-specific tax exposure from the outset. We offer a free consultation to walk through your family's specific citizenship status, asset levels, and goals, and to explain in plain language what a coordinated plan would look like for your situation. You can reach our office at (212) 561-4299 to get started.
Frequently Asked Questions
Why don't non-citizen spouses get the unlimited marital deduction?
The unlimited marital deduction under IRC Section 2056 only applies when the receiving spouse is a U.S. citizen, regardless of how long a non-citizen spouse has lived in the U.S. or whether they hold a green card. Congress limited the deduction this way out of concern that a non-citizen spouse could leave the country with tax-free assets, putting them beyond the IRS's future reach.
What is a QDOT and how does it help?
A Qualified Domestic Trust, authorized under IRC Section 2056A, allows assets left to a non-citizen spouse to still qualify for marital deduction treatment if they pass into the trust instead of directly to the spouse. This defers federal estate tax until trust principal is distributed to the surviving spouse or that spouse dies, rather than eliminating the tax entirely.
How are distributions from a QDOT taxed?
Income distributed from the QDOT to the surviving non-citizen spouse is generally tax-free and doesn't trigger estate tax. Distributions of principal, however, generally trigger the deferred estate tax at the time they're made, with a narrow exception for demonstrated hardship distributions such as documented medical needs.
Does becoming a U.S. citizen eliminate the need for a QDOT?
It can. If the surviving spouse becomes a U.S. citizen before the deceased spouse's federal estate tax return (Form 706) is filed, the QDOT requirement may be avoided, or an existing QDOT may potentially be terminated, restoring normal unlimited marital deduction treatment. Timing relative to the filing deadline is critical, so this should be coordinated closely with an attorney.
Does a QDOT also defer New York estate tax?
No, and this is a common and costly misunderstanding. New York has its own separate estate tax with no QDOT-equivalent relief or deferral mechanism, so even when a QDOT successfully defers the federal estate tax, New York estate tax can still be due in full at the first spouse's death if the estate exceeds New York's exemption.
