What Is a foreign trust? IRS rules, reporting forms, and deadlines (2026)
If you’re a US citizen or resident who owns, benefits from, or contributes to a foreign trust – such as a foreign pension plan, or a family estate trust set up abroad – you’re likely dealing with a complex set of reporting obligations. Whether you’re planning to set up a trust or already receiving distributions, read on for tax information and compliance tips related to foreign trusts.
What you'll learn: You’ll learn what a foreign trust is under IRS rules, why expats run into this more often than they expect, and the biggest risk to avoid – missing required reporting and triggering steep penalties.
You’ll also see the key forms and the deadlines that matter for the 2026 filing season (2025 tax year).
You’re in the right place if…
- owner (grantor) under the grantor trust rules
- beneficiary who may get distributions
- transferor who moved money or property into a trust
- dealing with a foreign pension-like arrangement that may be treated as a trust for US reporting
This article is brought to you by Taxes for Expats (TFX) – a top-rated tax firm serving US citizens, residents, and anyone with US tax obligations, both at home and abroad. Are you a grantor or beneficiary of a foreign trust? Have questions about tax requirements? We’re here to assist you – learn more about our tax services or contact us.
What is a foreign trust?
For US tax purposes, the Internal Revenue Service (IRS) defines a foreign trust as any trust that fails to meet both of the following tests:
- Court test – A US court must be able to exercise primary supervision over the administration of the trust.
- Control test – One or more US persons must have the authority to control all substantial decisions of the trust.
If either test is not satisfied, the trust is classified as foreign.
Plain English: If a US court doesn’t supervise it OR US persons don’t control key decisions, it’s foreign.
In other words, a trust outside the domestic trust rules can still be treated as foreign. That’s why the foreign trust definition is about supervision and control, not just a mailing address. The official rule for these tests is in Treas. Reg. § 301.7701-7.
A common example of a foreign trust is a retirement or superannuation fund established under foreign law – such as an Australian super fund or a UK pension plan – where a US taxpayer is a contributor or beneficiary, but the fund is administered outside the United States.
Importantly, what qualifies as a foreign trust is not always obvious. It’s not just about location — many foreign entities classified as trusts for US tax purposes wouldn’t be treated as such if they were domestic. For instance, a significant number of foreign pension funds fall under the definition of foreign trusts. In contrast, US pension accounts, while trust-like in structure, are not treated as trusts for tax reporting purposes.
Reid Kopald, enrolled agent (EA) and tax manager at Taxes for Expats
Who is considered an owner of a foreign trust?
Under the grantor-trust rules (IRC 679), if a US person transfers property to a foreign trust that has (or is presumed to have) at least one US beneficiary, the transferor is treated as the owner of the portion of the trust funded by that property.
Owner status is determined under the broader grantor trust rules in IRC §§671–679, not just one section. The IRS uses these rules to decide who reports trust activity.
A quick distinction helps:
- Owner: treated as owning part (or all) of the trust for US tax reporting, often tied to funding and certain powers.
- Beneficiary: not treated as the owner, but may have reporting and tax results when distributions occur.
The IRS instructions for Form 3520 point directly to these grantor trust sections when discussing ownership reporting.
Types of foreign trusts
Foreign trusts come in many forms, and their classification directly affects your tax obligations and filing requirements if you’re involved with one.
Grantor and non-grantor trusts
- Grantor trust: The grantor (person who created or contributed assets to the trust) retains control or benefit from the trust’s income or assets. The grantor reports trust income on their personal US tax return.
- Non-grantor trust: The trust is treated as a separate taxable entity. The trustee (often a non-US person) is responsible for trust income, while US beneficiaries may be taxed only on distributions.
Distributions can trigger special rules and extra calculations, especially when income is built up over time.
Revocable and irrevocable trusts:
- Revocable: The grantor can revoke or amend the trust. Usually treated as a grantor trust.
- Irrevocable: Cannot be changed once established. These are typically non-grantor and subject to complex reporting and potential US tax exposure.
So what? Planning and reporting can be more document-heavy because control and benefit tests drive the outcome.
Discretionary and fixed trusts:
- Discretionary trusts: Trustees have discretion over whether to distribute income or principal to beneficiaries.
- Fixed trusts: Beneficiaries are entitled to specific amounts or shares.
So what? It can be easier to track who is entitled to what, but reporting still hinges on ownership and distributions.
A second point worth knowing: a foreign express trust can still be treated as owned by a US person under the grantor rules, even when trustees and assets sit abroad.
How to set up a foreign trust tends to start with local legal steps (deed, trustee, situs), then shifts quickly into US classification and reporting under the court and control tests.
US tax implications of foreign trusts
If you're a US person involved with a foreign trust, the IRS holds you to specific and often complex tax rules – whether you're a grantor, beneficiary, or transferor.
Tax impact overview: Some years are reporting-only, meaning forms are required even when no extra income tax is due. Other years create taxable income events, such as grantor income being reported on your return, or taxable outcomes tied to distributions and accumulation rules. The hard part is that reporting and taxes can move in different directions in the same year.
Official rules live in the Form 3520 and Form 3520-A instructions, and those instructions are the best place to confirm what applies.
Grantor rules
Under Internal Revenue Code (IRC) 679, when a US person transfers property to a foreign trust that has at least one US beneficiary, the IRS treats the transferor as the owner of that portion of the trust for US tax purposes.
This means you're responsible for reporting all income, deductions, and credits tied to that trust on your Form 1040, even if you don't receive any distributions or cash. The trust’s activity becomes yours effectively from the IRS’s perspective.
Even with no cash distribution, income may still be reportable on your 1040.
Example – Swiss family inheritance trust: A US citizen contributes personal assets into a Swiss trust that will benefit their children, all US persons. Even though the trust is set up abroad and may not make distributions for years, the grantor must report the trust income yearly, since US beneficiaries exist.
Beneficiary rules
If you're a beneficiary, your tax obligation is based on distributions received. For non-grantor foreign trusts, distributions may be subject to accumulation distribution rules, which apply when the trust distributes previously accumulated income.
This can trigger the throwback tax, a regime that taxes the income as if it had been distributed in earlier years, along with interest charges for deferred tax. These rules aim to prevent deferral of US tax through offshore structures.
This tends to show up with accumulation distributions from non-grantor trusts, especially when income builds up for years, and a later payout arrives. The simple reason it exists is to reduce long-term deferral by using special calculations.
A quick example path:
- The trust earns income.
- The trust does not distribute it.
- Later, it pays out – and special calculations may apply.
Example – UK pension trust inheritance: A US resident inherits a stake in a British pension trust established by a UK relative. When the trust makes a distribution, it includes income earned over multiple years. Since this income wasn't previously taxed in the US, the throwback tax regime kicks in.
Gift and estate tax exposure
Gift reporting (including foreign gifts rules)
Transferring assets to a trust may require gift tax reporting under US gift tax rules. Separately, Form 3520 Part IV can apply when large gifts or bequests are received from foreign persons, even though the foreign gift itself is generally not income taxable.
For tax year 2025 (filed in 2026), the §6039F threshold for gifts treated as received from foreign corporations/partnerships is $20,116. (For tax year 2026, that threshold increases to $20,573.)
Estate inclusion (retained control / funded assets)
Estate tax exposure is a different topic. When a US citizen or resident dies, assets they funded or retained certain powers over may be pulled into the taxable estate, depending on the facts and the relevant estate tax rules.
IRS reporting requirements
US persons must comply with strict reporting requirements for foreign trusts. The key forms are:
| Form | Who files it | Purpose |
|---|---|---|
| Form 3520 | US owners, beneficiaries, and transferors | Reports transactions with a foreign trust, including contributions and distributions |
| Form 3520-A | The foreign trust (or US owner if trust doesn’t file) | Provides annual information about the trust and its US owners |
| Form 8938 | US taxpayers with foreign financial assets | May include foreign trust interests if value thresholds are met |
| FBAR (FinCEN 114) |
US persons with foreign financial accounts over $10,000 |
Required if trust accounts are accessible or reportable |
Form 3520-A is typically due by March 15 of the following year. Form 3520 is due with your individual tax return (including extensions).
What you file when – quick decision aid
- Form 3520: file when there’s a reportable event involving a foreign trust – a transfer to the trust, a distribution to you, or US ownership reporting under the grantor trust rules.
- Form 3520-A: file when the trust has a US owner – it’s the trust’s annual information return, and it should produce the owner/beneficiary statements that support Form 3520 reporting.
- Form 8938: file when you meet the asset-threshold rules for specified foreign financial assets and your foreign trust interest is reportable under those rules.
- FBAR: file when you have financial interest or signature authority over foreign financial accounts (including accounts held by a trust, depending on your relationship and authority) and the combined maximum value of all foreign accounts is over $10,000 at any time during the year.
Also read. FBAR filing guide for 2026
You may receive Form 3520-A information or statements from the foreign trustee – sometimes around the same time as W-2s or 1099s. If you don’t, a substitute 3520-A may be needed to reduce penalty exposure, and the US owner can be on the hook when the trust doesn’t file.
The 3520-A instructions also make a key point: a Form 1040 extension does not extend the Form 3520-A deadline.
Who must file Form 3520?
File one Form 3520 per trust if you:
- You transferred money or property to a foreign trust.
- You are the grantor, owner, or transferor.
- You received a distribution from the trust.
- You have signature authority or financial interest.
- You are owed or owe a qualified obligation.
- You received a gift or bequest: over $100,000 from a nonresident or foreign estate, or over the threshold from foreign corporations/partnerships (check IRS Rev. Proc. for current amount).
Penalty snapshot: Form 3520 penalties are generally the greater of $10,000 or 35% of the gross value of certain transfers or distributions, or 5% tied to certain Form 3520-A failures involving trust assets treated as owned by a US person.
Which form do I file?
| Situation | Form(s) that usually come up | Notes |
|---|---|---|
| Money/property moved into a trust | Form 3520 | Report the transfer event. |
| Ownership under grantor rules | Form 3520 + Form 3520-A (or substitute) | Annual reporting is the core obligation. |
| Distribution from a foreign trust | Form 3520 | The distribution is a reportable event. |
| Foreign accounts you can control or access | FBAR (and sometimes Form 8938) | FBAR is about accounts – not “the trust value.” |
| Large foreign gifts/bequests | Form 3520 Part IV | Thresholds depend on the source and year. |
Foreign trust taxation deadlines & extensions
Form 3520 and Form 3520-A sound similar, but the deadlines work differently.
- Form 3520 is filed by the US person. It is due by the 15th day of the 4th month after the end of the filer’s tax year, with extra time for taxpayers who live and work outside the United States, and it can follow a personal extension.
- Form 3520-A is filed by the foreign trust, but the US owner is exposed when it isn’t filed. It is due by the 15th day of the 3rd month after the end of the trust’s tax year.
One critical rule: A Form 1040 extension (Form 4868) does not extend Form 3520-A.
NOTE! A Form 3520-A extension is typically requested using Form 7004, filed using the trust’s EIN, by the Form 3520-A due date.
Common expat scenarios – requirements
Foreign pension-like arrangements
Some foreign retirement arrangements may be treated as trust-like structures for US reporting, depending on the plan and country rules. The reporting risk is filing gaps on trust forms or on foreign asset forms.
Next steps: Collect plan documents and annual statements, then confirm classification using the Form 3520 and 3520-A instructions.
Inherited family trust abroad
An inheritance can arrive through a trust rather than directly. Reporting risk often shows up when you later receive cash or property, because distributions can be reportable even when the tax due is unclear at first glance.
Next steps: Request a trust accounting for the year and any beneficiary statements, and keep records of dates and amounts.
Non-US spouse or family trust
A trust created by a non-US spouse or parent can still touch US reporting once a US person becomes a beneficiary, receives gifts, or receives trust distributions. Reporting risk is mixing up “gift reporting” with “trust reporting” and filing the wrong parts of Form 3520.
Next steps: Identify whether payments are gifts or distributions, and track totals against the reporting thresholds.
Trustee won’t cooperate
Trustees sometimes refuse to file Form 3520-A or share statements. Reporting risk is that the US owner can still face penalties when the trust doesn’t file.
Next steps: Document requests in writing, gather what you can, then prepare a substitute filing “to the best of your ability,” following the IRS instructions.
NOTE! Foreign trust tax rules can feel intimidating, but the cleanest path is usually simple – lock down the facts, pull the right documents, then match the facts to the IRS reporting steps.
FATCA and FBAR compliance
FBAR isn’t based on “trust exceeds $10,000.” The filing rule is about foreign financial accounts where a US person has a financial interest in or signature authority over one or more accounts, and the aggregate value of those accounts exceeds $10,000 at any time during the calendar year.
Trust context still matters. A trust may hold foreign bank or brokerage accounts, and a US person might have signature authority or other reportable control. That can bring FBAR into the picture even when the tax return feels straightforward. Official FBAR guidance and filing instructions are maintained by FinCEN.
Foreign trust taxation often overlaps with asset reporting, but each form has its own trigger and its own deadline rules. Clean records make the whole process feel less heavy.
Quick wrap-up
- What is a foreign trust for US tax purposes? This comes back to one thing – the court and control tests.
- Foreign trust tax compliance is often about forms first, then tax second, and penalties can apply even when no extra tax is due.
- Foreign express trust planning can be valid under local law, but US reporting still needs to be handled with care.
Need help navigating foreign trust rules?
Are you an owner, beneficiary, or contributor to a foreign trust? Confused about IRS reporting requirements or which forms you need to file? At Taxes for Expats, we help US taxpayers around the world stay compliant with foreign trust reporting. Book your free discovery call – we’ll review your situation and guide you through your next steps.
FAQs on foreign trust taxation in the US
Yes. Legality depends on local law where the trust is formed and administered. US rules focus on reporting and tax treatment, not banning the structure.
The IRS applies the court test and the control test under Treas. Reg. § 301.7701-7. If a trust fails either test, it is treated as a foreign trust for US tax purposes.
Sometimes. Under the grantor trust rules, income can be taxed to a US owner even if no distributions were made. In other situations, there may be reporting obligations without current tax. The specific facts determine the outcome.
Form 3520 reports transfers to a foreign trust, ownership interests, or distributions received by a US person. Form 3520-A is the annual information return required for foreign trusts with a US owner.
If the foreign trustee does not file Form 3520-A or provide the required information, the US owner may need to file a substitute Form 3520-A attached to Form 3520, completed to the best of their ability. It is important to document requests made to the trustee.
Some foreign pensions and retirement plans may be treated as trust-like arrangements for US reporting purposes, depending on their structure and governing documents. Reviewing plan documents and relevant IRS guidance helps determine the correct classification.
