Offshore Trusts and US Reporting: Forms 3520, 3520-A, PFIC and FBAR

The Scope of US Reporting

The United States taxes its citizens and residents on worldwide income, regardless of where that income is earned or where the assets are located. This foundational principle extends to offshore trusts: if a US person creates, transfers property to, receives distributions from, or has an ownership interest in a foreign trust, multiple reporting obligations arise — each carrying severe penalties for non-compliance.

The reporting regime is designed to ensure that the IRS has full visibility into offshore trust structures. The penalties are intentionally disproportionate to the apparent significance of the forms, precisely because Congress determined that offshore trusts were being used to evade tax obligations.

Form 3520: Annual Return to Report Transactions with Foreign Trusts

Who Must File

Form 3520, Annual Return to Report Transactions with Foreign Trusts and Receipt of Certain Foreign Gifts, must be filed by:

• US transferors: Any US person who transfers property (including cash) to a foreign trust
• US owners: Any US person treated as the owner of any portion of a foreign trust under the grantor trust rules (IRC sections 671-679)
• US beneficiaries: Any US person who receives a distribution (directly or indirectly) from a foreign trust

What Is Reported

• Transfers to the foreign trust (Part I)
• US owner's share of trust income (Part II)
• Distributions received from the foreign trust (Part III)
• Receipt of gifts from foreign persons exceeding USD 100,000 (Part IV)

Filing Deadline

Form 3520 is due on the filing deadline of the US person's income tax return, including extensions. For calendar-year individuals, this is typically 15 April (or 15 October with extension).

Penalties

The penalty for failure to file or for filing an incomplete or inaccurate Form 3520 is:

• Transferors: 35% of the gross value of property transferred to the trust
• US owners: 5% of the gross value of the portion of the trust attributable to the US owner
• Beneficiaries: 35% of the gross distributions received

These penalties are per year and are assessed automatically. They are not subject to a reasonable cause exception unless the taxpayer affirmatively demonstrates reasonable cause — a high burden. The IRS has been aggressive in asserting these penalties, and the Tax Court has upheld them in numerous cases, including Wilson v Commissioner (T.C. Memo 2021-37).

Form 3520-A: Annual Information Return of a Foreign Trust with a US Owner

Who Must File

Form 3520-A must be filed by the trustee of any foreign trust that has at least one US owner. If the foreign trustee fails to file, the US owner is responsible for filing a substitute Form 3520-A and is subject to penalties.

What Is Reported

• The trust's income statement (income, deductions, and net income)
• The trust's balance sheet
• A Foreign Grantor Trust Owner Statement (provided to each US owner)
• A Foreign Grantor Trust Beneficiary Statement (provided to each US beneficiary who received a distribution)

Filing Deadline

Form 3520-A is due on 15 March of the year following the trust's tax year (for calendar-year trusts). An extension to 15 September is available.

Penalties

The penalty for failure to file Form 3520-A is 5% of the gross value of the trust assets attributable to the US owner, per year. This penalty applies regardless of whether the US owner was responsible for the trustee's failure to file.

FBAR (FinCEN Form 114)

Any US person who has a financial interest in, or signature authority over, a foreign financial account with an aggregate value exceeding USD 10,000 at any time during the calendar year must file an FBAR. A US person who is treated as the owner of a foreign trust that holds foreign financial accounts is considered to have a financial interest in those accounts.

• Filing deadline: 15 April (automatic extension to 15 October)
• Filed electronically through FinCEN's BSA E-Filing System (not with the IRS)
• Penalties: Non-willful failure to file: up to USD 12,500 per account per year. Willful failure: the greater of USD 100,000 or 50% of the account balance per account per year. Criminal penalties (up to USD 250,000 and 5 years' imprisonment) apply for wilful violations.

FATCA Reporting (Form 8938)

Under the Foreign Account Tax Compliance Act (enacted as part of the HIRE Act 2010), US persons must report specified foreign financial assets on Form 8938 if the aggregate value exceeds:

• Unmarried individuals living in the US: USD 50,000 on the last day of the tax year, or USD 75,000 at any time during the year
• Married filing jointly in the US: USD 100,000 / USD 150,000
• Individuals living abroad: USD 200,000 / USD 300,000 (single) or USD 400,000 / USD 600,000 (married filing jointly)

A US person's interest in a foreign trust is a specified foreign financial asset reportable on Form 8938. The penalty for failure to file is USD 10,000, plus USD 10,000 for each 30-day period of continued failure (up to USD 50,000).

Grantor Trust Rules: IRC Sections 671-679

For US tax purposes, an offshore trust is classified as either a grantor trust or a non-grantor trust. This classification determines who pays tax on the trust's income.

Section 679: The Presumption Rule

Under IRC section 679, a foreign trust is treated as a grantor trust (with all income taxable to the US transferor) if:

• A US person transfers property to the trust, directly or indirectly, and
• The trust has one or more US beneficiaries

The definition of "US beneficiary" is extremely broad — it includes any US person who could possibly receive a distribution from the trust at any time, even if the person is not currently named as a beneficiary.

Non-Grantor Foreign Trust: The Throwback Tax

If the trust is a non-grantor trust (e.g., because the settlor is not a US person), distributions to US beneficiaries are subject to the "throwback tax" under IRC sections 665-668. This rule:

• Taxes the distribution as if the income had been distributed to the beneficiary in the year it was earned
• Applies the highest marginal rate for each year of accumulation
• Adds an interest charge calculated from the year the income was earned to the year of distribution

The effective tax rate on accumulated distributions from a non-grantor foreign trust can exceed 50% when the interest charge is included.

PFIC Reporting (Form 8621)

If the foreign trust holds shares in a passive foreign investment company (PFIC) — which includes most offshore investment funds and many offshore holding companies — the US owner or beneficiary must file Form 8621 for each PFIC.

The PFIC rules (IRC sections 1291-1298) impose punitive tax treatment on gains and excess distributions from PFICs unless the taxpayer makes a qualifying electing fund (QEF) election or a mark-to-market election. In practice, the QEF election requires the PFIC to provide an annual information statement, which many offshore funds do not provide.

Practical Compliance Strategy

For US persons involved in offshore trusts, the following compliance framework is essential:

• Identify all reporting obligations at the time the trust is established or the US person becomes involved
• Engage a US tax adviser who specialises in international tax and offshore trust reporting
• Ensure the foreign trustee understands its obligation to file Form 3520-A and to provide the US owner with a Foreign Grantor Trust Owner Statement
• Coordinate FBAR and Form 8938 reporting to cover all foreign accounts held by the trust
• Screen trust investments for PFIC status before acquisition and maintain records for Form 8621 reporting
• Consider voluntary disclosure (through the IRS Streamlined Filing Compliance Procedures or the Delinquent International Information Return Submission Procedures) if prior returns were not filed

Key Takeaways

• US persons connected to offshore trusts face a web of overlapping reporting obligations: Forms 3520, 3520-A, FBAR, Form 8938, and Form 8621
• Penalties for non-compliance are severe and automatic — 35% of transfers, 5% of trust value per year, and up to 50% of account balances for wilful FBAR violations
• The grantor trust rules under IRC section 679 treat most offshore trusts created by US persons with US beneficiaries as tax-transparent, meaning the settlor pays tax on all trust income
• Distributions from non-grantor foreign trusts are subject to the punitive throwback tax with interest charges
• PFIC exposure arises from virtually any offshore investment fund held within the trust
• Compliance must be planned at the time the trust is established — retroactive correction is possible but more expensive and carries audit risk