Form 706-NA: US Estate Tax for Nonresident Aliens

Most foreign founders learn the U.S. tax system through the income-tax lens — substantial presence, effectively connected income, Form 5472. The estate tax runs on a completely different track, and the difference is what catches people. For estate-tax purposes the controlling concept is domicile, which the IRS defines as physical presence in a place combined with an intent to remain there indefinitely. A person can spend meaningful time in the United States and still be a nonresident not a citizen for estate tax, and an income-tax substantial-presence analysis simply does not answer the estate-tax question.

The reason this matters so much is the filing trigger. The executor must file Form 706-NA if the date-of-death value of the decedent's U.S.-situated assets, combined with the old gift-tax specific exemption and adjusted taxable gifts, exceeds $60,000. The IRS is explicit that this $60,000 threshold is not indexed for inflation — it does not climb each year the way the citizen exclusion does.

Sit that next to the exclusion a U.S. citizen or domiciliary gets. On the IRS's current estate-tax pages the 2026 basic exclusion amount is $15,000,000. So the practical federal threshold for many nonresident estates is about $60,000, while the citizen/domiciliary exclusion is $15,000,000 — a gap of roughly 250 times. That single mismatch is why a foreign investor who would never think about U.S. estate tax as a domiciliary can have a large filing and payment problem purely from direct ownership of U.S.-situs assets.

The operative federal provisions are concentrated in IRC sections 2101, 2102, 2103, 2104, 2105, 2106, and 2209, with the situs and deduction detail in the estate-tax regulations. In shorthand: section 2101 imposes the tax, section 2103 defines the gross estate by reference to U.S.-situated property, section 2102 supplies the limited nonresident credit, sections 2104 and 2105 do the situs work, and section 2106 governs deductions.

There is no nonresident equivalent of the multimillion-dollar exclusion. A U.S. citizen or domiciliary shelters up to the 2026 basic exclusion of $15,000,000 through a unified credit; a nonresident gets a unified credit of only about $13,000 under section 2102, which is the credit historically tied to the roughly $60,000 effective threshold. Everything above that is exposed to a graduated rate schedule that climbs to 40%.

Two features make the nonresident regime unforgiving. First, the threshold is fixed — there is no annual inflation bump, so it erodes in real terms every year. Second, the tax is computed on the U.S.-situs portion only, but at rates set by the size of that U.S. slice, and the tax generally must be paid before the estate is settled and the property can pass to heirs. A six- or seven-figure U.S. rental held directly can therefore generate a real cash liability that the family has to fund out of pocket or by selling the asset.

Because the number is so low, the planning question is rarely 'will I owe estate tax' in the abstract — it is 'is this specific asset U.S.-situs, and can it be restructured before death so it is not.' That is where the rest of this report lives.

Start from the statute, not intuition. Under the regulations, real property physically located in the United States is U.S.-situs property. Direct ownership of U.S. land, a home, a condo, or rental property is therefore the classic nonresident estate-tax exposure — there is no ambiguity about it.

Stock of a domestic corporation is also U.S.-situs, and this rule is unusually important because it applies even though stock is intangible property. The mirror-image rule is the planning lever: stock of a foreign corporation is treated as property situated outside the United States. That domestic-vs-foreign corporate-stock split is one of the most consequential lines in the whole subject.

Debt and cash need care. The situs rules generally treat debt obligations of U.S. persons and certain U.S. governmental obligations as U.S.-situs, but section 2105 and the regulations carve out big exceptions — most famously the U.S. bank-deposit exception: a qualifying deposit with a U.S. banking business, if not tied to a disqualifying U.S. business use, is generally not U.S.-situs property. It is one of the best-known nonresident protections.

The trap is assuming brokerage cash gets the same treatment. A cash balance in a brokerage account is not automatically the same thing as a protected bank deposit. Whether it qualifies depends on the actual legal arrangement — is it a true bank deposit, a money-market instrument, or simply part of the brokerage relationship. The statute protects qualifying bank deposits; it does not bless every U.S. cash position merely because a U.S. financial institution holds it.

One more protected category drives planning: the Code and regulations exclude certain life-insurance proceeds on the decedent's own life from U.S.-situs treatment for nonresident estate-tax purposes. That is why life insurance shows up so often in cross-border estate structures.

This is the most under-documented part of the subject, and the most dangerous to guess at. Sections 2104 and 2105 expressly classify U.S. real estate, domestic-corporation stock, certain debt, foreign-corporation stock, bank deposits, and similar assets — but they do not expressly classify partnership interests or LLC interests. That statutory silence is the root of the section 2104 controversy.

For a single-member LLC that is disregarded for federal tax purposes, conservative planning usually assumes the estate-tax analysis looks through to the underlying asset. If the disregarded LLC owns U.S. real estate, most practitioners treat the underlying U.S. real estate as the real exposure, because the federal transfer-tax system tends to follow the underlying ownership economics for a disregarded entity. That is a practical filing norm, not a clean statutory sentence.

For a multi-member LLC taxed as a partnership, the answer is genuinely unsettled. Because Congress said domestic-corporation stock is U.S.-situs but said nothing about partnership or partnership-classified LLC interests, advisers split across at least three approaches: an aggregate look-through to the underlying U.S. assets, an entity-interest view that treats the interest itself as the asset, and more nuanced tests that ask where the business is carried on or what kind of property dominates the entity. The official materials gathered here contain no single modern IRS pronouncement that resolves this across all partnership and LLC facts.

So the practical answer to 'is my U.S. LLC interest U.S.-situs?' usually comes in one of three versions, and the structure that actually solves the situs question cleanly is the foreign corporation — because the estate then holds foreign-corporation stock, which section 2105 places outside the United States.

If you take one structural idea from this report, take this one. Because section 2105 treats stock of a foreign corporation as situated outside the United States, interposing a foreign blocker corporation between the nonresident and the U.S. investment changes what the estate owns. The foreign person owns the foreign corporation; the foreign corporation owns the U.S. asset; and at death the estate holds only foreign-corporation stock, which is normally outside the U.S. estate-tax base. It is the classic bright-line federal situs answer for many nonresident families.

The tradeoff is that a blocker is an estate-tax fix, not a whole-tax fix. Holding U.S. real estate through a corporation can change the income-tax, FIRPTA, corporate-tax, and refinancing picture — corporate rates on rental income, no preferential long-term capital-gain rate on a sale, and possible branch-profits or withholding consequences depending on the structure. The situs point is clear; the total-tax answer is not, and the two cannot be planned in isolation.

The corollary is just as important: partnerships and LLCs are not a bright-line answer. A domestic or foreign partnership can solve other business problems and may help in some treaty or operations settings, but the federal estate-situs answer for a partnership or partnership-classified LLC is precisely where the controversy sits. 'Put it in an LLC' is not reliable estate-tax advice unless the planner has also answered what tax classification the LLC has and what assets it holds.

The federal default is the small section 2102 unified credit. But section 2102(b)(3)(A) says that credit must be coordinated with U.S. treaty obligations, and a treaty can increase it — often by reference to the ratio of U.S.-situated property to the decedent's worldwide estate. The current Form 706-NA instructions confirm that treaties with Australia, Canada, Finland, France, Germany, Greece, Italy, Japan, and Switzerland contain provisions to which section 2102(b)(3)(A) applies, and they separately address the United Kingdom treaty, which works through a specific cap rather than that generic list.

Canada has the most developed language: Article XXIX B of the U.S.-Canada treaty expressly provides a pro-rata unified credit, a possible marital credit, and additional death-tax rules, and the current instructions also describe Canadian small-estate relief for certain U.S. securities and other U.S.-situs property where the worldwide estate is not more than $1.2 million.

France and Germany were modernized by protocol. The 2004 protocol to the U.S.-France estate/gift treaty added a pro-rata unified credit for a non-U.S.-citizen domiciled in France plus noncitizen-spouse relief, raising the French domiciliary's credit toward the citizen credit on a ratio basis. The 1998 protocol to the U.S.-Germany treaty added a greater-of unified-credit rule for a German domiciliary and a treaty marital-deduction mechanism — its protocol text is one of the clearest primary sources in this area.

The United Kingdom is different in form. The instructions state that if the decedent was a U.K. national (and neither domiciled in nor a national of the United States) and property is subject to U.S. estate tax under the treaty, the U.S. tax may not exceed the estate tax that could have been imposed had the decedent died domiciled in the United States — a worldwide-cap computation. The instructions cite Paragraph 5 of Article 8 and require a statement showing the alternate computation.

Australia and Japan remain current treaty countries listed for section 2102(b)(3)(A), but the deep-research source did not independently retrieve the operative article text for either. Older treaty texts should be read directly rather than assumed to operate like the newer Canadian, French, or German models — verify the article before relying on it.

Use the current form package, not an old checklist. The instructions say that to complete Form 706-NA you must also obtain Form 706 and its instructions, and you must attach Form 706 schedules if you claim the marital deduction, the charitable deduction, a qualified conservation easement exclusion, the credit for tax on prior transfers, or if you answer 'Yes' to certain Part III questions. The right mental model is Parts I through V plus attached Form 706 schedules where needed — older practitioner shorthand about schedules can be outdated.

Part I is decedent and executor identification, where the executor's status and contact data become operational; the instructions stress that executors must provide documentation proving their authority. Part II is the tax computation — use the Form 706 unified rate schedule for the date of death, apply the nonresident unified credit, then layer in treaty adjustments, including the Canadian marital credit on line 10 when that election applies.

Part III asks the general-information questions that often determine which extra schedules or statements must be attached — which is why incomplete filings get into trouble: the return is not just an asset list, it is a gateway form for elections, treaty positions, and cross-references to Form 706 schedules. Part IV computes the taxable estate and is where the proportional-deduction framework lives: line 2 requires the value of the gross estate outside the United States (with documentary proof such as a certified foreign death-tax return or probate inventory), and line 4 gathers deductions like funeral and administration costs, claims, mortgages, and casualty losses.

Part V is the property-valuation section for the U.S.-situated estate and the election point for alternate valuation. The U.K. note recurs here too: if the Article 8(5) limitation applies, the executor must attach the statement showing the alternate computation and claim the treaty benefit on the filed return.

The return is due within 9 months after death, and Form 4768 gives an automatic 6-month extension to file. An executor who is out of the country and has already taken the 6-month extension can request a further extension by filing a second Form 4768 with the required explanation. Tax payment is generally due within that same 9-month window unless an extension to pay is granted.

Valuation starts at date-of-death fair market value. The section 2032 alternate valuation election is available only if it decreases both the gross estate and the net estate tax after credits; if elected it applies across the board, with property disposed of within six months valued on the disposition date and property still held valued six months after death.

The noncitizen-spouse marital deduction is a trap. Since 1988, transfers to a noncitizen surviving spouse have been taxed currently rather than sheltered by the ordinary marital deduction — the later French and German protocols were written partly to soften that, and both build relief around the idea that property would have qualified had the spouse been a U.S. citizen (the German protocol even references the date a qualified domestic trust (QDOT) election could be made). In practice, the default rule for a noncitizen spouse is far less generous than the citizen-spouse marital deduction, so a QDOT or treaty relief becomes central.

Charity is narrower than families expect. The Treasury technical explanation to the Canada protocol states that, for a decedent who is not a U.S. citizen or resident for estate-tax purposes, a charitable bequest is deductible under section 2106(a)(2) only if the recipient is a U.S. corporation — the treaty then widens that for qualifying Canadian organizations. The pattern is general: the federal baseline restricts the charitable deduction to U.S. organizations, and treaty relief can expand it country by country.

The cleanest pre-death moves follow from the situs rules. A foreign blocker corporation converts the estate asset to foreign-corporation stock. Life insurance stays valuable because the protected insurance category is not treated like directly held U.S. real estate or domestic stock. An irrevocable trust can remove assets from the estate — but only if the transfer is complete and the decedent keeps no powers or interests that pull the property back in under the ordinary inclusion rules, which is a separate trust-level review beyond Form 706-NA itself.

A Chinese owner with a U.S. rental property shows the default problem. Held directly, the U.S. real estate is U.S.-situs and a Form 706-NA filing is likely once value crosses the $60,000 threshold. Held through a properly structured foreign corporation, the estate would more likely hold foreign-corporation stock, outside the U.S. situs rule. Held through a domestic LLC — disregarded or partnership-classified — the answer becomes far more dangerous and fact-sensitive.

A Canadian with a U.S. brokerage account needs asset-by-asset classification. U.S. shares inside the account are still U.S.-situs domestic stock; qualifying bank deposits may be excluded under section 2105, but brokerage cash is not automatically covered. If the Canadian decedent qualifies for treaty relief, Article XXIX B may grant a pro-rata unified credit, and a small enough worldwide estate may reach the small-estate relief the instructions describe for certain U.S. securities.

A U.K. national with a U.S. LLC interest sits in the hardest box. If the LLC is effectively a wrapper around U.S. real estate or operating assets, direct-exposure thinking is usually the safer filing posture; if it is partnership-classified and holds a U.S. investment portfolio, the situs answer may be debated — but the executor must not confuse 'LLC' with 'non-U.S.-situs.' If the U.K. treaty applies, the instructions point to Article 8(5) and require the alternate tax-cap computation to be attached.

Filing is not the end of administration. The instructions separately flag transfer certificates for U.S. assets — the documents U.S. custodians and registrars often demand before they will release or re-register a deceased nonresident's U.S. property — and direct executors to the IRS Estate and Gift unit that handles them. The same instructions note that an estate-tax closing letter is not issued automatically: it must be requested through Pay.gov, and executors should generally wait at least 9 months after filing before requesting it, with account transcripts offered as an alternative.

The IRS does not publish a one-page list of 706-NA exam triggers. The safe inference from the instructions is that review risk rises when the return lacks support for the worldwide estate values needed in Part IV, support for the line-4 deductions, a treaty statement and alternate computation when the treaty requires one, or a defensible explanation for excluding assets from Part V under a treaty or situs theory. That is an inference from the filing instructions, not a verbatim examination manual.

Finally, state death taxes sit on top of the federal problem. The federal instructions allow a deduction for qualifying state death taxes, subject to a proportional formula and a certificate from the taxing state — which means a nonresident with U.S. real or tangible property can face both a federal 706-NA issue and a separate state-level death-tax issue. The federal analysis above should always be paired with separate local review before planning or filing.