What Is a Qualified Domestic Trust (QDOT) and Does My Non-Citizen Spouse Need One?

If your spouse is not a U.S. citizen, you cannot use the unlimited marital deduction to pass assets to them tax-free at death. Without a Qualified Domestic Trust (QDOT), your estate could owe federal estate tax on everything above the $13.99 million exemption (2025) the moment you die, rather than deferring that tax until your surviving spouse’s death.

A QDOT solves this by holding assets for your non-citizen spouse in a trust structure that qualifies for the marital deduction. According to the IRS, the executor must elect QDOT treatment on the estate tax return (Form 706), and the trust must meet specific requirements for the deduction to be allowed.

This matters for American expats in particular because mixed-citizenship marriages are common among expat couples, and the estate tax rules for non-citizen spouses are significantly less favorable than for citizen spouses.

Married to a Non-U.S. Citizen?

Greenback helps you understand whether a Qualified Domestic Trust (QDOT) is needed and how it affects your estate and tax planning.

Here’s how QDOTs work, what happens without one, the requirements your trust must meet, and what this means for your estate plan.

Why Does a Non-Citizen Spouse Need a QDOT?

U.S. estate tax law treats citizen and non-citizen surviving spouses very differently:

	U.S. Citizen Spouse	Non-Citizen Spouse (Without QDOT)	Non-Citizen Spouse (With QDOT)
Unlimited marital deduction?	Yes. Transfer any amount tax-free.	No. Not available.	Yes. Deduction applies to assets in the QDOT.
Estate tax at first death	Deferred until the surviving spouse dies	Immediately owed on assets above $13.99M exemption	Deferred until distributions or the surviving spouse’s death
Lifetime gift exclusion	Unlimited between spouses	Limited to $190,000/year (2025)	N/A (QDOT is for transfers at death)
Annual gift exclusion (general)	$19,000 per recipient	$19,000 per recipient	N/A

The problem without a QDOT: If you’re a U.S. citizen with $8 million in assets and your non-citizen spouse inherits everything outright, the estate owes $0 in federal estate tax (under the $13.99M threshold). But if your estate is $16 million, the IRS taxes the amount above $13.99M immediately at rates up to 40%. With a citizen spouse, the entire $16 million passes tax-free with the unlimited marital deduction, and tax is deferred until the surviving spouse dies.

The QDOT solution: Assets passing to the QDOT qualify for the marital deduction, deferring estate tax until the QDOT makes distributions to the surviving spouse or until the surviving spouse dies.

How Does a QDOT Work?

A QDOT operates like a bridge: it holds assets for your non-citizen spouse while preserving the marital deduction your estate would lose without it.

Income: The surviving non-citizen spouse receives all trust income. The trust must require that all income is distributable to the surviving spouse.
Principal distributions: Any distribution of principal (the underlying assets, not income) triggers federal estate tax at that time. The tax is calculated as if the distribution were part of the deceased spouse’s estate.
At the surviving spouse’s death: All remaining assets in the QDOT are subject to estate tax, calculated as if they were included in the first spouse’s estate.
If the surviving spouse becomes a U.S. citizen: The QDOT can terminate and the remaining assets pass outright to the spouse with no further estate tax consequences (provided the spouse was a U.S. resident at all times after the first spouse’s death).

What Are the Requirements for a QDOT?

Requirement	Details
Election on estate tax return	The executor must elect QDOT treatment on Form 706. This is not automatic.
All income distributable	Trust documents must require that all income is paid to the surviving non-citizen spouse.
At least one U.S. trustee	At least one trustee must be a U.S. citizen or a U.S. domestic corporation.
Estate tax on principal	Every distribution of principal triggers estate tax, computed as if it were included in the deceased spouse’s estate.
Annual reporting	Form 706-QDT must be filed annually to report the trust balance and any distributions.

Additional Security Requirements

The IRS imposes extra requirements based on the value of assets transferred to the QDOT:

QDOT Value	Additional Requirement
Over $2 million	At least one trustee must be a U.S. bank, OR the trustee must post a bond equal to 65% of the trust’s fair market value, OR the trustee must provide an irrevocable letter of credit equal to 65% of the trust’s FMV.
$2 million or less	Either no more than 35% of trust assets (measured annually) can be foreign real property, OR the trust must meet one of the bank/bond/letter of credit requirements above.

The $2 million threshold is based on the values finally determined for estate tax purposes, ignoring any debt on the property.

What Are the Tax Implications?

Income tax: The QDOT is taxed as a simple trust for income tax purposes. Income flows through to the surviving spouse and is reported on their personal tax return.
Estate tax on distributions: Each principal distribution triggers estate tax calculated at the rates that would have applied if the distribution were part of the first spouse’s estate. This means the tax is based on the deceased spouse’s marginal rate, not the surviving spouse’s.
Estate tax at surviving spouse’s death: Any assets remaining in the QDOT when the surviving spouse dies are included in the taxable estate and subject to estate tax at that time.
Form 706-QDT: Must be filed annually to report the trust’s value and distributions. The form is also used to report estate tax due on any principal distributions made during the year.

Is a QDOT Always the Best Option?

Not necessarily. A QDOT defers estate tax but does not eliminate it. In some situations, other strategies may produce better results:

If your combined estate is under $13.99 million (2025): You may not need a QDOT at all, because your estate won’t owe federal estate tax regardless. However, if asset growth could push your estate above the threshold, a QDOT provides insurance.
If your non-citizen spouse becomes a citizen: The surviving spouse can become a U.S. citizen before the estate tax return is filed (generally 9 months after death), which would make them eligible for the unlimited marital deduction without a QDOT. The spouse must also have been a U.S. resident at all times after the first spouse’s death.
If the OBBB changes the exemption: The One Big Beautiful Bill Act increased the basic exclusion amount to $15 million for 2026. For estates near the threshold, this may affect whether a QDOT is needed. Review your estate plan as exemption amounts change.
Credit shelter trust (bypass trust): Many estate plans for mixed-citizenship couples use both a credit shelter trust (funded up to the estate tax exemption) and a QDOT (for the excess), maximizing the amount that passes without triggering estate tax.

Pro Tip

The decision of whether a QDOT is the most tax-efficient approach depends on the spouses’ relative wealth, expected asset growth, residency plans, and state estate tax considerations. This is a case-by-case determination that should be reviewed periodically as your financial situation changes.

Expat-Specific Considerations

1. Living Abroad with a Non-Citizen Spouse

Mixed-citizenship marriages are especially common among American expats. If you are married to a citizen of the country where you live, QDOT planning becomes essential if your combined assets could approach the estate tax threshold.

2. Lifetime Gifts as an Alternative

During your lifetime, you can give your non-citizen spouse up to $190,000 per year (2025; $194,000 for 2026) without triggering gift tax. This annual exclusion is significantly higher than the $19,000 general exclusion but far lower than the unlimited transfer available to citizen spouses. Strategic lifetime gifting can reduce the assets that would otherwise need to pass through a QDOT.

For more on gift tax rules, see our gift tax guide for Americans abroad and our Form 709 guide.

3. Foreign Assets in the QDOT

If the QDOT holds foreign real property and the total trust value is $2 million or less, no more than 35% of the trust’s assets may be foreign real property (measured on the last day of the trust’s tax year). Expat couples with significant foreign real estate may need to use the bank trustee, bond, or letter of credit alternatives instead.

4. Cross-Border Coordination

Your non-citizen spouse’s country of residence may impose its own inheritance or estate taxes. The U.S. has estate tax treaties with 15 countries (plus Canada) that can prevent double taxation. Coordination between the QDOT and local inheritance rules requires professional planning.

For more on estate taxes for Americans abroad, see our estate tax guide for expats.

Frequently Asked Questions

Does my non-citizen spouse need a QDOT if our estate is under $13.99 million?

Not for federal estate tax purposes. If your estate (including worldwide assets) is below the exemption, no federal estate tax is owed, regardless of your spouse’s citizenship. However, some states have much lower estate tax thresholds, and asset growth could push your estate above the federal exemption in the future. A QDOT provides insurance against these risks.

Can my non-citizen spouse become a citizen to avoid needing a QDOT?

Yes. If the surviving spouse becomes a U.S. citizen before the estate tax return is filed (generally within 9 months of death) and was a U.S. resident at all times after the first spouse’s death, the unlimited marital deduction applies, and no QDOT is needed.

What happens if the QDOT pays out principal to the surviving spouse?

Each principal distribution triggers federal estate tax, calculated as if the distribution were part of the deceased spouse’s estate. The tax is reported on Form 706-QDT.

Can the surviving spouse receive income from the QDOT without triggering estate tax?

Yes. Income distributions from a QDOT are not subject to estate tax. Only distributions of principal (corpus) trigger the estate tax. Income is taxed as ordinary income on the surviving spouse’s personal return.

What is Form 706-QDT?

Form 706-QDT (U.S. Estate Tax Return for Qualified Domestic Trusts) is filed annually to report the QDOT’s assets and any taxable distributions made during the year. It is also used to pay any estate tax triggered by principal distributions.

How much can I give my non-citizen spouse during my lifetime without triggering gift tax?

For 2025, the annual exclusion for gifts to a non-citizen spouse is $190,000 ($194,000 for 2026). Gifts above this amount count against your $13.99 million lifetime exemption (2025) and require filing Form 709.

Does the QDOT election happen automatically?

No. The executor must affirmatively elect QDOT treatment on the estate tax return (Form 706). If the election is not made, the marital deduction does not apply to assets passing to a non-citizen spouse.

Estate planning with a non-citizen spouse involves complex rules that most domestic estate attorneys rarely encounter. At Greenback, we work with expat couples to coordinate U.S. tax obligations with international estate planning, ensuring your family is protected across borders.

If you’re ready to be matched with a Greenback accountant, click the get started button below. For general estate planning or Greenback questions, contact our Customer Champions.

Get Your Cross-Border Estate Planning Right

Greenback’s CPAs and Enrolled Agents help you understand QDOT requirements and manage estate tax obligations.

This article is for informational purposes only and does not constitute legal, tax, or estate planning advice. QDOT rules are complex and vary based on individual circumstances. For the latest guidance, see IRS instructions for Form 706 and the regulations under IRC Section 2056A. Always consult with qualified estate planning and tax professionals regarding your specific situation.