Form 3520 Foreign Trust Reporting: Gifts, Inheritances & Traps

Form 3520 is the U.S. information return that catches out more accidental non-filers than almost any other international disclosure. It reports transactions with foreign trusts, ownership of foreign trusts, and large gifts or inheritances received from foreign persons. It carries no tax liability of its own — but the penalties for missing it start at USD 10,000 and climb into six figures quickly. Americans abroad, dual citizens, and green card holders inheriting from family overseas run into it constantly, often without realising the form applies.

The trigger is disclosure, not taxation. The IRS wants to see the money flow, even when the underlying receipt is entirely tax-free. Understanding which events cross the threshold, how Form 3520-A fits alongside it, and which foreign arrangements the IRS treats as trusts is the difference between a routine filing and an assessment notice.

Who must file Form 3520

Any U.S. person — citizen, resident alien, or domestic corporation, partnership or estate — must file Form 3520 if any of four events occur in the tax year:

• Creating a foreign trust or transferring money or property to one, including a U.S. person becoming an owner of a previously non-U.S. trust after moving to the United States.
• Ownership of any part of a foreign trust under the U.S. grantor trust rules (Sections 671 through 679 of the Internal Revenue Code).
• Receiving distributions — direct or indirect — from a foreign trust, including the uncompensated use of trust property.
• Receiving large gifts or bequests from foreign persons above the reporting thresholds set out below.

Form 3520 is due when the U.S. income tax return is due, generally 15 April, with an automatic extension to 15 October if Form 4868 is filed. U.S. persons abroad get the automatic 15 June extension. Unlike FinCEN Form 114 (the FBAR), Form 3520 is filed on paper and mailed separately to the IRS Ogden service center. Our FBAR and FATCA reporting guide covers how those companion filings intersect.

The gift and inheritance threshold most people miss

The reporting threshold for foreign gifts looks simple until the aggregation rules bite. A U.S. person must file Form 3520 Part IV when they receive, in aggregate during the tax year:

• More than USD 100,000 in gifts or bequests from a nonresident alien individual or foreign estate; or
• More than an inflation-adjusted threshold — around USD 19,570 for 2024, verified annually in the Form 3520 instructions — in gifts from foreign corporations or foreign partnerships.

The USD 100,000 individual threshold is aggregated across related donors. A parent giving USD 60,000 and a sibling giving USD 45,000 in the same year both count where the IRS treats them as related persons for gift purposes. Multiple bequests from the same foreign estate combine. Where a bequest arrives in tranches across more than one tax year — common in probate — the aggregation resets each year.

Critically, the gift itself is not taxed. U.S. gift tax falls on the donor, not the recipient, and a nonresident alien donor is generally outside the U.S. gift tax net for gifts of foreign-situs property. The Form 3520 filing is pure information reporting. But failure to file when required triggers a penalty of 5% of the unreported amount per month, capped at 25% — so a USD 500,000 unreported inheritance sits at a USD 125,000 exposure before any question of culpability is even reached. The related discussion of cross-border wealth transfers in our inheritance tax when moving abroad piece sets out the wider planning picture.

Form 3520-A: the trustee filing

Form 3520-A is the annual information return of a foreign trust with a U.S. owner. In principle it is the foreign trustee's responsibility, filed by the 15th day of the third month after the trust's tax year end — 15 March for a calendar-year trust. In practice foreign trustees rarely file it. The U.S. owner remains responsible for ensuring the return is filed and, if the trustee does not do so, must attach a substitute Form 3520-A to their own Form 3520.

The interaction matters because the penalties stack. A U.S. beneficiary who owns a portion of an unreported foreign trust can face:

• A USD 10,000 minimum penalty (or 5% of the U.S. owner's share of trust assets, whichever is greater) for the missed 3520-A;
• A 35% penalty on the gross value of any transfers to the trust reported late on Form 3520;
• A 35% penalty on distributions received but not reported;
• Further continuing penalties of USD 10,000 per 30-day period after IRS notice, capped at the reportable amount.

The accidental foreign trusts

The category that generates the most non-compliance is what practitioners call the accidental foreign trust. The IRS applies a broad, functional definition of trust that captures many arrangements not called trusts in their home jurisdiction.

Foreign pensions and retirement accounts

Employer pensions, personal pension wrappers, and many defined-contribution schemes outside the United States can be classified as foreign grantor trusts for U.S. tax purposes. Australian superannuation, UK SIPPs and personal pensions, Mexican Afores, Singaporean SRS accounts and Hong Kong MPF have all been treated as trusts in different fact patterns. The result is potential exposure to Form 3520, Form 3520-A, and — because the account holds pooled investments — the Passive Foreign Investment Company (PFIC) regime on top.

The IRS carved out relief in Revenue Procedure 2020-17, which exempts certain tax-favored foreign retirement trusts and tax-favored foreign non-retirement savings trusts from Forms 3520 and 3520-A, provided the trust meets specific conditions on contribution limits, tax-favored status, information reporting, and other criteria. Whether any particular pension actually qualifies is a facts-and-circumstances question. See the companion piece on the U.S. tax treatment of foreign pensions for the analytical framework.

Canadian TFSA, RESP and RDSP

Canadian Tax-Free Savings Accounts, Registered Education Savings Plans, and Registered Disability Savings Plans are the most notorious accidental foreign trusts. Unlike RRSPs and RRIFs — which received explicit relief in Revenue Procedure 2014-55 and no longer require Forms 3520 or 3520-A — these three account types generally remain reportable. The income inside a TFSA is also currently taxable to the U.S. holder despite being tax-free in Canada. The problem is compounded because the accounts are typically opened by cross-border families for entirely non-tax reasons, and neither the Canadian bank nor a general U.S. tax preparer flags the issue. See the Canada country profile for how Canadian residency interacts with U.S. citizenship.

Mexican fideicomisos

A Mexican fideicomiso — the bank trust structure Americans must use to hold real estate in Mexico's coastal and border restricted zones — was long treated as a foreign trust requiring Forms 3520 and 3520-A. The IRS reversed course in Revenue Ruling 2013-14, holding that a fideicomiso used solely to hold Mexican real estate is not a trust for U.S. tax purposes. The ruling is narrow. A fideicomiso holding anything other than real property, or engaged in any commercial activity, may still be characterised as a trust.

UK ISAs and offshore bonds

The UK's Individual Savings Account is not treated as tax-free in the United States. The underlying investments are frequently PFICs, and any life-wrapper offshore bond arrangement can itself trigger foreign trust classification. Under the UK's post-2025 residence-based regime, the United Kingdom's residence framework pulls many Americans in the UK into full UK worldwide scope after four years of residence, layered on top of continuing U.S. citizenship-based obligations.

Comparing the reporting landscape: US, UK and Canada

The table underscores that the U.S. is unusual in requiring recipient-side gift disclosure at all. UK and Canadian residents facing similar family-money flows generally have no equivalent obligation, and the U.S. person's Form 3520 exposure is often a surprise to European or Canadian family members trying to help. Figures above are as of 2026 and jurisdiction-dependent; verify with a qualified local adviser before acting.

Penalty structure and reasonable cause defence

The Form 3520 penalty regime is one of the harshest in the Internal Revenue Code:

• Gifts and inheritances (Part IV): 5% of the unreported amount per month, capped at 25%.
• Transfers to foreign trusts (Part I): 35% of the value of the property transferred.
• Distributions from foreign trusts (Part III): 35% of the gross distribution received.
• Form 3520-A failures: the greater of USD 10,000 or 5% of the trust's assets attributable to the U.S. owner.

Penalties are assessable — the IRS can collect without first going through Tax Court, so the taxpayer's usual pre-payment forum is unavailable. Recent litigation challenged the IRS's authority to assess certain international information return penalties, and the D.C. Circuit ruled in the government's favour in 2024. The statutory position is now settled, but this is an area where case law continues to move; verify the current state of the law with a specialist adviser.

Reasonable cause is available as a defence but is difficult to establish. Reliance on a preparer who was unaware of the form generally does not qualify. Not knowing an account existed — for example, a jointly-held foreign account opened by a parent decades earlier — has occasionally succeeded when documented carefully.

Coming into compliance late

The IRS operates several pathways for taxpayers who discover late Form 3520 obligations:

• Streamlined Filing Compliance Procedures — for taxpayers whose non-compliance was non-willful. Foreign-resident U.S. citizens use the Streamlined Foreign Offshore Procedures and face no penalty on properly filed information returns. U.S.-resident filers use the Streamlined Domestic Offshore Procedures and pay a 5% miscellaneous offshore penalty on the highest year-end value of undisclosed foreign assets. See the streamlined filing guide for the mechanics.
• Delinquent International Information Return Submission Procedures — for taxpayers who have no unreported income but missed the information returns. The IRS may waive penalties for reasonable cause.
• Quiet disclosure — filing late returns outside any formal programme. Not recommended: the IRS has explicitly stated that quiet disclosures do not qualify for penalty relief and can invite audit.

Choosing between programmes turns on whether unreported income exists, whether the conduct was willful, and — for people who have decided the compliance burden is no longer worth continued U.S. status — whether renouncing U.S. citizenship is a realistic option.

Practical filing checklist

• Identify every foreign account, retirement wrapper, and family arrangement that could be characterised as a trust, and get a written classification from a U.S.-qualified adviser.
• Track inbound gifts and bequests by donor and by year. The USD 100,000 threshold is per year of receipt and aggregated across related donors.
• File Form 3520 by the income tax due date, on paper, to the Ogden service center. Extensions of the 1040 extend Form 3520.
• Confirm Form 3520-A has been filed by any foreign trustee, or attach a substitute 3520-A to your own Form 3520.
• Retain the underlying documentation — deeds of gift, probate paperwork, trust deeds, and trustee correspondence — for at least six years after filing.

Where to go next

For further TaxAtlas coverage of the related reporting and residency questions, see the guide on how tax residency works, the analysis of U.S. tax treatment of foreign pensions, and the reference on the Common Reporting Standard. Country profiles for the United States, United Kingdom and Canada summarise the underlying residency and income tax rules; the country comparison tool sets them alongside alternatives. This article is informational only and not tax advice; anyone with a specific Form 3520 exposure should consult a U.S. tax adviser experienced in international information returns.