How Are Foreign Trusts Taxed in the United States? (w/Examples) + FAQs

How a foreign trust is taxed in the United States depends entirely on two things: who created it and what kind of trust it is. The tax rules are completely different if the person who funded the trust is a U.S. citizen versus a foreign citizen. The rules also change dramatically based on whether the trust is a “grantor” trust or a “non-grantor” trust.

The primary problem comes from a specific federal law, Internal Revenue Code (IRC) § 679. This rule creates a major trap for U.S. persons. It states that if a U.S. person puts money or property into a foreign trust that has a U.S. beneficiary, the IRS treats the U.S. person as if they still own the assets, forcing them to pay U.S. taxes on the trust’s worldwide income every year.

This area of tax law is a major focus for the Internal Revenue Service (IRS). In 1998 alone, U.S. individuals reported transferring nearly $852 million to foreign trusts, highlighting the significant flow of wealth into these complex structures.¹ The IRS has since increased its scrutiny to combat tax evasion.

Here is what you will learn to navigate this complex topic:

❓ Discover if your overseas pension or family inheritance is secretly a “foreign trust” in the eyes of the IRS.
🎁 Learn how some families use foreign trusts to give millions to their U.S. children completely tax-free.
💀 Uncover the “throwback rule,” a tax nightmare that can consume over 100% of a distribution with taxes and interest charges.
✍️ Get a line-by-line guide to the dreaded IRS Forms 3520 and 3520-A to avoid crippling penalties.
🛡️ Find out the critical mistakes that can destroy your asset protection and how to avoid them.

What Makes a Trust “Foreign” in the Eyes of the IRS?

The first step is figuring out if you are even dealing with a foreign trust. The IRS has a simple rule: a trust is automatically considered foreign unless it passes two specific tests to prove it is a domestic (U.S.) trust.² This means “foreign” is the default status, and the burden is on you to prove otherwise.

This classification has nothing to do with where the trust’s assets are located or where the beneficiaries live. A trust in Ohio holding only U.S. stocks can be a “foreign trust.” A trust in the Cayman Islands holding only foreign real estate can be a “domestic trust.”

The Two Tests That Define a U.S. Trust

To be a domestic trust, a trust must pass both the Court Test and the Control Test. If it fails even one, it is a foreign trust.⁴

The Court Test: Is a U.S. Court in Charge?

This test asks whether a court within the United States can exercise primary supervision over the trust’s administration.³ This means a U.S. judge must have the main authority to handle legal issues or disputes related to the trust.

A trust usually fails this test if its legal documents contain an “automatic migration clause” or “escape clause.” This is a provision stating that if a U.S. court tries to take charge, the trust’s legal home automatically moves to another country. This feature, designed for asset protection, instantly makes it a foreign trust because it prevents a U.S. court from having the final say.⁶

The Control Test: Do U.S. Persons Hold the Reins?

This test asks whether one or more U.S. persons have the authority to control all “substantial decisions” of the trust.³ If any non-U.S. person has the power to veto a key decision, the trust fails this test.

Substantial decisions are the important ones, such as deciding when to distribute money, how much to distribute, who gets it, how to invest the assets, or when to end the trust.⁷ A common trap is appointing a foreign “trust protector” who can block the U.S. trustee’s decisions. Even if this power is never used, its existence is enough to make the trust foreign.⁸

The Key Players: Grantor, Trustee, and Beneficiary

Every trust has three main roles: the grantor, the trustee, and the beneficiary. Understanding who does what is critical because U.S. tax law assigns different responsibilities and tax burdens to each.

Role	Description
The Grantor	This is the person who creates the trust and puts assets into it. They are also called the “settlor” or “transferor.” Under U.S. tax law, the grantor’s citizenship and residency are the most important factors in determining how the trust is taxed.³
The Trustee	This is the person or company (like a bank) that legally holds and manages the trust’s assets. The trustee has a fiduciary duty to act in the best interests of the beneficiaries and follow the rules set out in the trust document. The trustee’s U.S. or foreign status helps determine if the trust passes the Control Test.³
The Beneficiary	This is the person, people, or entity who will receive money or assets from the trust. A beneficiary’s U.S. status can trigger major tax consequences, especially if they receive distributions from a foreign non-grantor trust.³

The Great Divide: Is It a Grantor or Non-Grantor Trust?

After determining a trust is foreign, the next question is the most important one: is it a grantor trust or a non-grantor trust? This single distinction changes everything about who pays tax, when they pay it, and how much they pay.² The answer almost always depends on the U.S. tax status of the grantor.

A grantor trust is considered a “disregarded entity” for tax purposes. This means the IRS looks right through the trust and taxes the person who is considered the “owner” on all the trust’s income, as if they owned the assets directly.¹⁰ A non-grantor trust is treated as a separate taxpayer, like a person, and it must file its own tax returns.¹⁰

Feature	Foreign Grantor Trust	Foreign Non-Grantor Trust
Who Pays Tax on Income?	The “owner” (usually the grantor) pays tax on the trust’s worldwide income each year on their personal tax return.	The trust itself pays tax on its U.S.-source income. U.S. beneficiaries pay tax when they receive distributions of income.
How Are Distributions to U.S. Beneficiaries Taxed?	They are treated as tax-free gifts from the owner.	They are taxable as income and may be subject to a punitive “throwback tax” with compounding interest.
Primary IRS Form for Beneficiary	Form 3520 to report the gift (if over the threshold).	Form 3520 to report the taxable distribution.

When the Grantor is a U.S. Person

When a U.S. person creates a foreign trust, the rules are designed to be harsh to prevent people from hiding money offshore. IRC § 679 is the law that governs this. It says a U.S. person who transfers property to a foreign trust is automatically treated as the owner if the trust has any U.S. beneficiaries.¹³

The law is so strict that it presumes a foreign trust has a U.S. beneficiary unless you can prove to the IRS that it is impossible for a U.S. person to ever benefit from the trust.¹³ The result is that the U.S. grantor must report and pay U.S. tax on all of the trust’s income and capital gains from around the world, every single year, even if no money is ever paid out.³

When the Grantor is a Foreign Person (Non-U.S. Person)

The rules are completely different, and much more favorable, when a non-U.S. person (a nonresident alien) creates a foreign trust. The harsh rules of IRC § 679 do not apply. Instead, under IRC § 672(f), the trust is only a grantor trust in two limited situations.¹⁵

The trust is revocable by the foreign grantor.
During the foreign grantor’s lifetime, the only people who can receive distributions are the grantor or the grantor’s spouse.

If either of these is true, the trust is a foreign grantor trust owned by a foreign person. Because a foreign person is not subject to U.S. tax on non-U.S. income, the trust can grow tax-free from a U.S. perspective. Most importantly, any distributions made to a U.S. beneficiary (like a child or grandchild) are treated as tax-free gifts from the foreign grantor.¹⁶

This makes the foreign grantor trust an incredibly powerful tool for foreign families to support their U.S. relatives. However, this favorable treatment ends the moment the foreign grantor dies. At death, the trust is no longer revocable, so it automatically converts into a foreign non-grantor trust, triggering a much more dangerous set of tax rules.¹⁶

The Tax Nightmare: Distributions from a Foreign Non-Grantor Trust

Receiving money from a foreign non-grantor trust is where U.S. beneficiaries face the biggest danger. The system is intentionally complicated and punitive. It is designed to force foreign trustees to provide detailed financial records to the U.S. beneficiaries, who need them to avoid a disastrous tax outcome.

DNI: The Trust’s Yearly Income

The first concept to understand is Distributable Net Income (DNI). Think of DNI as a measuring stick for the trust’s taxable income in a given year.¹⁸ When a foreign non-grantor trust makes a distribution to a U.S. beneficiary, that distribution is considered taxable income up to the amount of the trust’s DNI for that year.¹⁹

A key difference for foreign trusts is that their DNI includes capital gains.²¹ If a distribution is larger than the current year’s DNI, it might be considered a tax-free distribution of the trust’s original principal (corpus). But once that runs out, you fall into the throwback rule.

The Throwback Rule: A Penalty for Tax Deferral

The most feared part of foreign trust taxation is the “throwback rule”.²³ This rule applies when a trust distributes income that it earned in a previous year but did not distribute at the time. This is called an “accumulation distribution.”

The purpose of the rule is to eliminate the benefit of letting income grow tax-free offshore for years. It does this by taxing the beneficiary as if they had received the income in the year the trust earned it. But it adds two punitive twists to make it painful.²⁷

All Income Becomes Ordinary Income. Any income that was originally a long-term capital gain (taxed at lower rates) is re-characterized as ordinary income, which is taxed at the highest personal rates.²¹
A Compounding Interest Charge is Added. The IRS adds an interest charge, calculated as if you underpaid your taxes for all the years the income was sitting in the trust. This interest compounds daily and can grow to an enormous sum, sometimes exceeding the tax itself.²¹

The Information Black Hole and the “Default Method”

To correctly calculate the tax and avoid the throwback rule on distributions of current-year income, a U.S. beneficiary needs a document from the trustee called a Foreign Nongrantor Trust Beneficiary Statement.²⁷ This statement breaks down the distribution into its components (current income, accumulated income, principal).

Many foreign trustees are unable or unwilling to provide this U.S.-specific document. If a beneficiary does not receive a complete statement, the IRS forces them to use a punitive “default method” on Form 3520.²⁸ This calculation method assumes the worst-case scenario, often treating a large portion of the distribution as a taxable accumulation distribution subject to the full force of the throwback tax and interest charge.²⁹

Three Common Scenarios: The Good, the Bad, and the Ugly

These rules are best understood through real-world situations. Here are three of the most common scenarios involving U.S. persons and foreign trusts.

Scenario 1: The Smart Pre-Immigration Plan

A non-U.S. couple in France wants to provide for their two U.S. citizen children in New York. They consult an expert and set up a foreign trust before moving any money. This is a textbook example of successful planning.

Action	Consequence
Parents create a revocable trust in a favorable jurisdiction.	The trust qualifies as a foreign grantor trust owned by a non-U.S. person under IRC § 672(f).¹⁵
Parents transfer $5 million of non-U.S. investments into the trust.	No U.S. gift tax is due because the grantors are foreign and the assets are not U.S. property.¹⁵
The trustee distributes $200,000 to each U.S. child.	The distributions are treated as tax-free gifts from the foreign parents. The children must report the gifts on Form 3520 but owe no tax.¹⁶
The trust’s investments grow over time.	The trust’s income and capital gains are not subject to U.S. tax, allowing the wealth to grow tax-efficiently for the U.S. heirs.¹⁵

Scenario 2: The Accidental Foreign Trust

A U.S. citizen has been working in the United Kingdom for years and contributes to a standard UK workplace pension plan. He is unaware that this simple retirement account has created a major U.S. reporting headache.

Situation	U.S. Tax Reality
The UK pension is administered by a UK company under UK law.	The pension fails both the Court Test and the Control Test. The IRS classifies it as a foreign trust.⁴
The U.S. citizen makes contributions to his own pension.	He is a U.S. person transferring property to a foreign trust with a U.S. beneficiary (himself). This makes it a foreign grantor trust under IRC § 679.¹³
He is unaware of any special U.S. reporting requirements.	He fails to file Form 3520 and ensure Form 3520-A is filed. This exposes him to annual penalties starting at $10,000 or 5% of the account’s value.³¹
He discovers the mistake years later.	He must use an IRS amnesty program, like the Streamlined Filing Compliance Procedures, to get back into compliance and argue for penalty relief.³²

Scenario 3: The Inheritance Nightmare

A U.S. resident is the beneficiary of a trust created by her foreign grandmother. While her grandmother was alive, distributions were tax-free gifts. But after her grandmother passes away, everything changes.

Event	Tax Impact
Foreign grandmother passes away.	The trust, which was revocable, becomes irrevocable. It instantly converts from a tax-friendly foreign grantor trust to a punitive foreign non-grantor trust.¹⁶
The trust distributes $500,000 of money that has been accumulating for 20 years.	This is an accumulation distribution, as the trust has no current-year income (DNI).²⁷
The foreign trustee provides no U.S. tax paperwork.	The beneficiary is forced to use the default method on Form 3520, which assumes a large portion of the distribution is taxable accumulated income.²⁸
The throwback rule is applied.	The accumulated income is taxed at the highest ordinary rates, and a massive, compounding interest charge is added. The final tax bill could easily be over $250,000, consuming more than half of the distribution.²¹

Mistakes to Avoid with Foreign Trusts

Setting up or being involved with a foreign trust is filled with traps. A single mistake can undo all the intended benefits and lead to financial disaster. Here are some of the most common and costly errors.

Attempting a DIY Approach. The rules are far too complex for generic online templates. Using a non-specialist or trying to create a trust yourself often results in fatal structural flaws that offer no protection and create huge tax problems. The cost to fix a broken trust is always higher than the cost to set it up correctly the first time.³³
Choosing the Wrong Jurisdiction. Not all offshore locations are equal. Some have strong, modern trust laws (like the Cook Islands), while others offer weak protection. A country’s political stability, reputation, and banking infrastructure are critical factors that are often overlooked.³³
Picking the Wrong Trustee. Appointing a friend or family member can create conflicts of interest. An inexperienced trustee may not understand the complex compliance duties or how to defend the trust against legal challenges. A professional, independent corporate trustee in a strong jurisdiction is usually the safest choice.³³
Keeping Too Much Control. If the grantor retains too much power over an “irrevocable” trust, a U.S. court may declare the trust a sham and disregard it completely. This includes acting as the trust protector with veto powers or being able to direct the trustee’s decisions. True asset protection requires giving up control.⁶
Waiting Too Long to Set Up the Trust. Transferring assets into a trust after a lawsuit has been filed or a creditor is threatening action can be deemed a “fraudulent conveyance.” Courts can undo these transfers. Asset protection planning must be done proactively, long before any legal clouds appear on the horizon.⁶
Ignoring the PFIC Rules. Allowing a foreign trust to invest in non-U.S. mutual funds or ETFs creates a tax catastrophe. These are likely Passive Foreign Investment Companies (PFICs), which have their own punitive tax regime that layers on top of the throwback rules, leading to confiscatory tax rates.¹⁶

Do’s and Don’ts for Foreign Trust Planning

Do’s	Don’ts
✅ Hire a Team of Specialists. You need a qualified attorney, an international tax CPA, and potentially a financial advisor who all specialize in this area. Their expertise is not optional.³⁵	❌ Don’t Assume Anything. Don’t assume your foreign pension isn’t a trust. Don’t assume a trust created in the U.S. is a “domestic” trust. Every detail must be verified.³⁵
✅ Clarify Your Goals. Are you planning for asset protection, multi-generational wealth transfer for U.S. heirs, or pre-immigration tax efficiency? Your goal dictates the entire structure.⁵	❌ Don’t Forget About the Grantor’s Death. The transition from a foreign grantor trust to a non-grantor trust is a critical and often overlooked event that must be planned for in advance.¹⁶
✅ Understand the Trust’s Classification. You must know if the trust is foreign or domestic, and grantor or non-grantor. This classification determines all U.S. tax and reporting obligations.⁵	❌ Don’t Mix U.S. and Foreign Assets Carelessly. Holding U.S. real estate or stocks in a foreign trust can create U.S. estate tax exposure for a foreign grantor and other complications. Assets should be segregated strategically.¹⁵
✅ Communicate with the Foreign Trustee. Ensure the trustee understands their U.S. reporting duties. You, the U.S. person, will be the one penalized if they fail to provide the necessary information or file Form 3520-A.³⁵	❌ Don’t Try to Hide. With global information sharing agreements like FATCA and the Common Reporting Standard (CRS), financial secrecy is a myth. The IRS knows about foreign accounts and trusts.³⁷

A Deep Dive into the Reporting Forms

The entire foreign trust tax system is built on a foundation of intense reporting. The IRS uses these forms to gain visibility into offshore structures. The penalties for failing to file them are automatic and severe, often calculated as a percentage of the assets involved.³⁸

Form 3520: The U.S. Person’s Report

This is the main form filed by a U.S. person to tell the IRS about their interactions with foreign trusts and their receipt of large foreign gifts.⁴⁰ It must be filed separately from your income tax return and mailed to a specific IRS center in Ogden, Utah.⁴² A separate Form 3520 is required for each foreign trust you interact with.⁴³

Here is a breakdown of the key parts of Form 3520:

Who Files? You must file if you are a U.S. person who:
- Created a foreign trust or transferred money/property to one.
- Are treated as the U.S. “owner” of a foreign trust.
- Received any distribution from a foreign trust.
- Received a large gift from a foreign person or entity.
Part I – Transfers by U.S. Persons to a Foreign Trust. This section is where you report creating a foreign trust or making a “gratuitous transfer” to one. A gratuitous transfer is any transfer other than a sale for full market value.⁴³ You must provide details about the trust, the property transferred, and its value.
Part II – U.S. Owner of a Foreign Trust. If you are treated as the owner of a foreign grantor trust (for example, under the IRC § 679 rules), you must check the box here. This part must be filed every year you are considered the owner, even if no transactions occurred.⁴³ This is also where you attach the “substitute Form 3520-A” if the foreign trustee fails to file it.
Part III – Distributions to a U.S. Person From a Foreign Trust. This is the most complex part of the form for beneficiaries. You must report any distribution received, including cash, property, loans, or even the rent-free use of a trust-owned vacation home.⁴²
- Line 29 & 30: These lines ask if you received a Foreign Grantor Trust Beneficiary Statement or a Foreign Nongrantor Trust Beneficiary Statement. Your answer here determines which calculation schedule you must use.
- Schedule A – Default Calculation. If you answer “No” to line 30 because you did not receive a complete statement from a non-grantor trust, you are forced to use this schedule. It applies a punitive formula that often results in a large portion of your distribution being treated as a taxable accumulation distribution.²⁸
- Schedule B – Actual Calculation. You can only use this schedule if you received a complete Foreign Nongrantor Trust Beneficiary Statement. It allows you to separate current income from accumulated income and principal, leading to a much more favorable tax result.²⁸
- Schedule C – Calculation of Interest Charge. If you have an accumulation distribution (from either Schedule A or B), you must use this schedule to calculate the painful, compounding interest charge owed under the throwback rule.⁴⁴
Part IV – U.S. Recipients of Gifts or Bequests. This part is for reporting large gifts from foreign persons that are not from a trust.
- From a foreign individual or estate: You must file if you receive more than $100,000 in a year. You must aggregate gifts from related persons.³²
- From a foreign corporation or partnership: You must file if you receive more than a much lower, inflation-adjusted threshold (around $19,570 for 2024).³²

Form 3520-A: The Foreign Trust’s Report

This is the annual information return that the foreign trust itself is required to file if it has a U.S. owner.⁴⁶ It provides the IRS with a detailed look at the trust’s finances, including its balance sheet and income statement. The due date is March 15 for a calendar-year trust, much earlier than a personal tax return.⁴⁶

The biggest challenge with Form 3520-A is that the legal duty to file falls on the foreign trustee, who is outside the IRS’s direct control. To solve this, the law makes the U.S. owner liable for the penalty if the form is not filed.³⁹ The penalty is the greater of $10,000 or 5% of the trust’s assets.³¹

To avoid this penalty, the U.S. owner has a critical escape hatch: the substitute Form 3520-A. If the foreign trustee will not file, the U.S. owner must complete Form 3520-A to the best of their ability and attach it to their own timely filed Form 3520.⁴⁶ By doing this, the U.S. owner satisfies the requirement and is protected from the penalty.

Frequently Asked Questions (FAQs)

Is my foreign retirement plan, like a UK pension or Australian Superannuation, considered a foreign trust?

Yes, in most cases. Because these plans are managed by foreign trustees and governed by foreign courts, they fail the tests to be a U.S. trust and are treated as foreign trusts by the IRS.9

Are distributions I receive from my foreign grandmother’s trust taxable?

Yes, if your grandmother has passed away. The trust became a non-grantor trust upon her death, and distributions of income are now taxable to you and may be subject to the punitive throwback rule.27

Do I have to report a $50,000 gift from my foreign aunt?

No. The reporting threshold for gifts from a foreign individual is more than $100,000 in a year. You only need to file Form 3520 if the total gifts from her and her relatives exceed that amount.32

What happens if the foreign trustee won’t give me any tax information?

No, you cannot simply ignore the distribution. The IRS requires you to use a punitive “default method” on Form 3520, which will likely result in a much higher tax bill, including throwback taxes and interest.28

My accountant forgot to file my Form 3520. Can I get the penalties waived?

Yes, it is possible but very difficult. You must prove you had “reasonable cause” for the failure. Simply blaming an accountant is often not enough, as the IRS holds you ultimately responsible for your own compliance.47

What is the difference between Form 3520 and Form 3520-A?

Yes, they are very different. Form 3520 is filed by the U.S. person to report transactions. Form 3520-A is the annual information return filed by the foreign trust itself (or by the U.S. owner).31

Can I avoid U.S. taxes by putting my assets in a foreign trust?

No, not if you are a U.S. person. A foreign trust you create will be a grantor trust, and you will be taxed on its worldwide income annually. Foreign trusts do not offer tax avoidance for U.S. persons.