What is a QDOT and do I need one?

A QDOT is a qualified domestic trust under IRC section 2056A that preserves the US estate tax marital deduction where the surviving spouse is not a US citizen. You need one if a US citizen or US domiciliary spouse dies leaving assets to a non-citizen spouse and the estate would otherwise face immediate US estate tax. It defers the tax rather than removing it.

Can my wife inherit tax free if she has a green card but not US citizenship?

No. A green card makes your wife a US tax resident but not a US citizen, so the unlimited estate tax marital deduction is denied. The assets must pass into a QDOT for the deduction to apply, or she must become a US citizen before the federal estate tax return is filed while having remained a US resident since the date of death.

When does a QDOT actually pay US estate tax?

Two main events trigger the deferred tax: any distribution of principal to the surviving spouse during her life, and the value remaining in the trust at her death. Income distributions and qualifying hardship distributions are excluded. The tax is calculated by adding the taxable amount to the first decedent's taxable estate, so the first death's rates and exclusion position apply.

What is the deadline for making the QDOT election?

The election is made on Form 706 for the first spouse to die, generally due nine months after death with a six-month extension available. The outer limit is one year after the due date including extensions. Once made, the election is irrevocable; once the window closes, it cannot be made at all, and the marital deduction is lost permanently.

Does the US-UK estate tax treaty let a British widow avoid a QDOT?

No. The US-UK estate and gift tax convention provides domicile tie-breakers, allocation of taxing rights and double tax credits, and in some cases a prorated unified credit for a non-domiciled decedent. Unlike the US-Canada treaty, it contains no marital credit that substitutes for a QDOT. A qualifying trust remains the route to the marital deduction.

How much can I gift my non-US-citizen spouse each year?

Gifts to a non-citizen spouse do not get the unlimited gift tax marital deduction, but section 2523(i) allows a substantially larger annual exclusion than the ordinary annual gift exclusion. The amount is indexed and published each year by the IRS, so check the current figure on IRS.gov. Consistent annual gifting can materially reduce the estate later exposed to QDOT rules.

Qualified Domestic Trust: US Estate Tax Planning

If your spouse is not a US citizen, the unlimited estate tax marital deduction is denied, and the fix in almost every case is a qualified domestic trust (QDOT) under Internal Revenue Code section 2056A. A QDOT does not eliminate the US estate tax on assets passing to a non-citizen spouse; it defers it, on condition that at least one trustee is a US person with power to withhold tax, that principal distributions are reported and taxed, and that the executor makes a valid election on the federal estate tax return. For couples where one spouse is a US citizen or domiciliary and the other is British, this single rule frequently drives the whole estate plan.

Why is the marital deduction denied to a non-citizen spouse?

Section 2056(d) switches off the marital deduction where the surviving spouse is not a US citizen. The policy reason is collection. A US citizen spouse who inherits free of tax will eventually be taxed on her own death, because US estate tax follows citizenship. A non-citizen spouse can leave the country with the assets and never file a US return again.

Congress therefore traded an outright exemption for a deferral mechanism. Assets can pass to the survivor without immediate tax, but only inside a structure that keeps a US fiduciary in the chain of custody and taxes the principal when it finally leaves the trust. That structure is the QDOT.

The rule bites regardless of how long the couple have been married or how much of the wealth the surviving spouse originally contributed. It is a status test on the survivor, applied at the first death, and nothing about residence, tax filing history or length of green card holding overrides it.

Does a green card change anything?

No. Lawful permanent residence makes your spouse a US income tax resident and, usually, a US domiciliary for estate and gift tax. It does not make her a citizen. A long-settled green card holder who has filed Form 1040 for thirty years is still a non-citizen spouse for section 2056 purposes.

This is one of the most common and most expensive misunderstandings we see. Couples assume that because both spouses are inside the US tax net for income purposes, the marital deduction is available. It is not. Only citizenship, or a QDOT, or the narrow post-death naturalisation route below, will preserve it.

What exactly is a QDOT?

A QDOT is an ordinary marital trust that satisfies additional statutory conditions in section 2056A. It must first qualify for the marital deduction on normal principles, typically as a QTIP trust or a general power of appointment trust, so the surviving spouse is entitled to all the income for life and nobody else can take from the trust during her lifetime.

On top of that, section 2056A imposes a fiduciary and reporting overlay designed to secure the deferred tax. The Treasury regulations under section 2056A fill in the detail, and the IRS instructions to the federal estate tax return are the practical starting point.

At least one trustee must be a US citizen individual or a domestic corporation (in practice, a US bank or trust company).
No distribution of principal may be made unless the US trustee has the right to withhold the section 2056A(b) estate tax from that distribution.
The trust must meet the regulatory security requirements appropriate to its size, so the IRS can actually collect.
The executor of the first-to-die spouse's estate must make an irrevocable QDOT election on the estate tax return.
The trust must be maintained under, and administered in accordance with, the law of a US state or the District of Columbia.

The trust instrument should recite these requirements expressly. Drafting a conventional QTIP trust and hoping to bolt on QDOT status later is a poor plan, though as noted below reformation is sometimes possible.

Who can act as trustee of a QDOT?

You need a US trustee with real authority. A co-trustee arrangement is common: a family member or UK adviser who understands the survivor's circumstances, alongside a US institutional trustee who signs off on distributions and handles withholding. The US trustee cannot be a figurehead, because the withholding obligation is the whole point of the design.

For larger trusts the regulations tighten further. Above a regulatory value threshold, the trust must either use a US bank as trustee or provide security to the IRS in the form of a bond or an irrevocable letter of credit. Below that threshold, a simpler arrangement is available, and there is an alternative test that looks at the proportion of the trust invested in foreign real property. Check the current requirements and the applicable figure against the section 2056A regulations and IRS guidance before you commit to a trustee structure, because the cost of an institutional trustee and the cost of a standby letter of credit are very different numbers over a long survivorship.

How and when is the QDOT election made?

The election is made by the executor on the federal estate tax return, Form 706, for the first spouse to die. That return is generally due nine months after the date of death, with a six-month extension available on a timely request. The election must be made no later than one year after the due date including extensions.

Once made, the election is irrevocable. Once the one-year window closes, it cannot be made at all. There is no reasonable-cause relief that reliably rescues a missed section 2056A election, and the consequence of missing it is immediate estate tax on the entire marital share at the first death, with no deferral and no second bite.

Note also that a Form 706 must be filed even where the estate would otherwise fall below the filing threshold, because the deduction and the election both depend on the return. Executors who assume no return is needed because the estate looks modest against the basic exclusion amount can destroy the deferral by inaction.

Can a trust be created or reformed after death?

Yes, and this is the practical rescue route where the will did not contemplate a non-citizen spouse. If property passes outright to the surviving spouse, she can irrevocably assign it to a QDOT before the estate tax return is filed, and the marital deduction is then available for the assigned property.

Alternatively, an existing trust that fails the section 2056A conditions can be judicially reformed, or amended under a power in the instrument, to add the US trustee and withholding provisions. The reformation must be commenced within the statutory window. Get US counsel involved early; a reformation started after the deadline is worthless.

How does the section 2056A(b) deferred estate tax work?

The deferred tax is triggered by two events. The first is any distribution of principal from the QDOT during the surviving spouse's lifetime. The second is the value of the property remaining in the QDOT on the surviving spouse's death. Certain other events, such as the trust ceasing to satisfy the QDOT requirements, also accelerate the charge.

The tax is computed in an unusual way. You do not apply the surviving spouse's own estate tax position. Instead the taxable amount is added to the taxable estate of the first spouse to die, and the additional tax that would have been payable is the section 2056A(b) tax. In effect, the first death's marginal rate and exclusion position are frozen and applied years later.

Principal distributed to the surviving spouse during life: taxable, unless an exception applies.
Property remaining in the QDOT at the surviving spouse's death: taxable.
Income distributed to the surviving spouse: not subject to the section 2056A tax.
Distributions on account of hardship: not subject to the section 2056A tax.
Distributions to reimburse the trustee for tax paid: excluded, so the tax is not compounded.

The US trustee withholds and remits. This is why the trust instrument must give the trustee that right expressly, and why distributions should never be made without first quantifying the charge.

Are income distributions really tax free?

Distributions of trust income to the surviving spouse escape the section 2056A charge. They remain subject to normal income tax in the survivor's hands, and to UK income tax if she is UK resident, but they do not trigger the deferred estate tax. This makes the income and principal boundary the single most important accounting distinction in the trust.

What counts as income for this purpose follows fiduciary accounting principles, not the survivor's cash needs. A capital gain realised inside the trust is generally principal. A trustee who funds the survivor's lifestyle out of realised gains and calls it income is creating a large, avoidable liability and a bad audit record.

What is the hardship exception?

Principal can be distributed free of the section 2056A tax where the distribution is made on account of hardship. The regulations set a demanding standard: an immediate and substantial financial need relating to the health, maintenance, education or support of the surviving spouse, or of someone the survivor is legally obliged to support.

Medical or long-term care costs the survivor cannot otherwise meet.
School or university fees for a dependent child.
Housing costs following loss of the survivor's other income.
Not: a discretionary property purchase, gifts to children, or investment opportunities.

Critically, the exception is unavailable if the survivor has other assets reasonably available to meet the need. Marketable securities held personally are treated as reasonably available. Retirement accounts and illiquid property may not be. The trustee should document the survivor's whole balance sheet at the time of the distribution, not just assert hardship after the fact.

What does a QDOT have to file each year?

The trustee files Form 706-QDT to report taxable distributions and to pay the section 2056A tax, generally by 15 April of the year following the calendar year in which the distributions were made. A final Form 706-QDT is filed after the surviving spouse's death for the remaining trust property. The trust also has its own US income tax filing obligations.

How does a UK-resident surviving spouse change the analysis?

Substantially. The QDOT is a US domestic trust for US purposes, but if the surviving spouse lives in the UK, the trust sits inside two systems that do not align. HMRC will look at the trust under its own rules on residence, the settlements legislation, and the inheritance tax regime, and the answers rarely mirror the US treatment.

Trustee residence matters for UK purposes. A trust with a US corporate trustee will typically be non-UK resident for UK income tax and capital gains tax, but the addition of a UK-resident individual co-trustee can change that. Appointing the survivor's British sibling as co-trustee for family comfort is exactly the sort of decision that quietly imports UK trust taxation.

Distributions to a UK-resident beneficiary from a non-resident trust engage the UK matching rules. Payments can be matched to relevant income and to stockpiled gains, with the associated anti-avoidance provisions and, for offshore funds, the offshore income gains rules. HMRC's guidance in the Trusts, Settlements and Estates Manual and the Capital Gains Manual sets out the mechanics. The result can be a UK charge on a distribution that the QDOT treats as tax-free income, or a UK charge on capital that has already borne the section 2056A tax.

What about UK inheritance tax and UK-situs assets?

Whether the QDOT property is within the UK inheritance tax net depends on the situs of the assets and on the settlor's own UK status at the time the trust was created. UK-situs assets, including UK real estate and, under the extended rules, structures deriving value from UK residential property, are exposed regardless of the settlor's status.

If the trust is within the relevant property regime, it faces ten-year anniversary charges and exit charges independently of anything happening in the US. A QDOT holding a London flat can therefore pay a UK periodic charge, a UK exit charge on distribution, and a US section 2056A charge on the same capital, at different times and on different measures of value.

The UK also replaced domicile with a long-term residence test as the connecting factor for inheritance tax from April 2025. That reform changes when a surviving spouse, and a trust she is connected with, come into or fall out of the UK net. Check the current position on GOV.UK and take UK advice before assuming the excluded property analysis you were given years ago still holds.

Does the US-UK estate and gift tax treaty help?

The US-UK estate and gift tax convention is genuinely useful, but not as a substitute for the QDOT. Its main work is done through the domicile tie-breaker rules, the allocation of taxing rights over particular categories of asset, and the credit provisions that relieve double taxation where both countries have a claim.

It can also, in defined circumstances, allow a non-domiciled decedent to claim a prorated unified credit rather than being limited to the very small statutory exemption otherwise available to non-domiciliaries on US-situs assets. That matters where the first spouse to die is the British one holding US shares or US real property.

What the US-UK convention does not contain is an equivalent of the marital credit found in the US-Canada treaty. There is no treaty route that simply hands a UK surviving spouse the unlimited marital deduction. If the estate is large and the survivor is not a US citizen, the QDOT is the mechanism, and the treaty operates alongside it rather than instead of it.

Can lifetime gifting reduce the need for a QDOT?

Yes, and this is the most underused tool in the set. Gifts to a non-citizen spouse do not qualify for the unlimited gift tax marital deduction, but section 2523(i) provides a much larger annual exclusion for gifts to a non-citizen spouse than the ordinary annual exclusion. The figure is indexed and published annually by the IRS.

Used consistently over a long marriage, that annual allowance moves a meaningful sum out of the US spouse's estate and into the non-citizen spouse's ownership, where it may sit entirely outside US estate tax if she is not a US domiciliary. The gifts must be real: separate accounts, separate control, and contemporaneous records. Nominal transfers that the donor continues to manage will not survive scrutiny.

Watch the joint property rules. The usual assumption that jointly held property is half-included in the first decedent's estate does not apply automatically where the survivor is not a US citizen. The consideration-furnished test applies instead, so the full value can be included unless the survivor can prove her own contributions. Keep the evidence of who funded what.

Should the surviving spouse simply naturalise?

If the surviving spouse becomes a US citizen before the estate tax return is filed, and has been a US resident at all times from the date of death to the date of naturalisation, the marital deduction is available and no QDOT is needed. Where naturalisation is already close, accelerating it is often the cleanest answer.

But do not treat citizenship as a costless fix. It brings the survivor permanently inside the US estate, gift and income tax system on worldwide assets, complicates any future return to the UK, and creates potential exposure to the expatriation regime if she later renounces. For a British survivor intending to move home, a QDOT is frequently the better long-term outcome even though it is the more complex one.

There is also a timing trap. The relief depends on citizenship being obtained before the return is filed. Naturalisation timelines are outside your control. Build the QDOT into the documents anyway, and let the executor decline the election if citizenship arrives in time.

How does portability interact with a QDOT?

Portability of the deceased spousal unused exclusion is available where a QDOT is used, but it does not settle down at the first death. Because further estate tax may be imposed under section 2056A as distributions are made, the unused exclusion amount is not finally determined until the QDOT terminates. The executor must still make the portability election on a timely Form 706.

What are the most common mistakes?

Assuming a green card, or decades of US tax filing, gives the spouse citizenship status for the marital deduction.
Not filing Form 706 at all, because the estate looked small, and so losing the election.
Missing the one-year outer deadline for the section 2056A election.
Naming only non-US trustees, or naming a US trustee without an express right to withhold tax.
Appointing a UK-resident co-trustee for family reasons and inadvertently making the trust UK resident.
Funding the survivor's lifestyle out of principal without quantifying the section 2056A charge first.
Treating realised capital gains as distributable income.
Claiming hardship without documenting that no other resources were reasonably available.
Ignoring UK ten-year anniversary and exit charges on UK-situs assets held in the trust.
Failing to use the annual non-citizen spouse gift exclusion during a long marriage.
Holding jointly titled property on the assumption that only half will be included in the estate.
Overlooking the security or bond requirement for larger trusts until after the return is filed.

Most of these are avoidable at drafting stage for a fraction of what they cost to unwind after a death.

What documentation should you keep?

The executed trust instrument, any reformation order, and the filed Form 706 showing the section 2056A election.
Trustee appointment documents evidencing that a qualifying US trustee has served continuously.
Any bond or letter of credit, with renewal records, and correspondence with the IRS about the security arrangements.
A date-of-death valuation file for every asset funding the trust, with appraiser reports for real property and closely held interests.
Fiduciary accounting records that separate income from principal for every year of the trust's life.
Copies of every Form 706-QDT filed, with the computation showing how the tax was derived from the first decedent's estate.
For each hardship distribution: the underlying need, quotes or invoices, and a contemporaneous schedule of the survivor's other assets.
Records of lifetime gifts to the non-citizen spouse, including bank transfer evidence and any Forms 709.
Evidence of contributions to jointly held assets, for the consideration-furnished test.
UK trustee residence records, board minutes, and where relevant the trust's UK pool of relevant income and stockpiled gains.
The survivor's UK residence record, given the long-term residence test now driving UK inheritance tax exposure.

These files will be reviewed by a US trustee, an IRS examiner and HMRC at different points over what may be a thirty-year trust. Build them as you go. Reconstructing an income and principal split a decade later, across two currencies and two accounting conventions, is expensive and often impossible.

What should you do now?

Confirm each spouse's citizenship, US domicile and UK long-term residence position in writing.
Review the wills and any revocable trust for a QDOT provision, and add one if it is missing.
Identify a workable US trustee and price the institutional or security route against expected trust size.
Start or resume annual gifting to the non-citizen spouse within the section 2523(i) exclusion.
Map which assets are UK-situs and model the UK inheritance tax charges alongside the US deferral.
Agree with your advisers who will file Form 706 and Form 706-QDT, and diarise the deadlines.

Consult IRS.gov for the current exclusion amounts, the instructions to Form 706 and Form 706-QDT, and Publication 559 on survivors and executors. Consult GOV.UK and HMRC's manuals for the UK inheritance tax and trust position. Where the two systems overlap, read them together with the US-UK estate and gift tax convention and the US-UK income tax treaty rather than in isolation.

This article is general commentary on US and UK tax law and is not advice on your circumstances. QDOT planning turns on the precise citizenship, domicile and residence position of both spouses, the situs and character of each asset, and the terms of the governing instruments. Take coordinated US and UK advice on your own facts before acting, and take it before the first death rather than after it, when almost every option is still open.