Form 3520 / 3520-A: Foreign Trust and Gift Reporting for Bay Area Filers

Your parents wire you $500,000 from Hong Kong to your Mountain View bank account as a wedding gift. Your father in Mumbai dies and you inherit a share of a family trust. Your uncle in Vietnam sets up an offshore trust naming you as beneficiary so the family can pass assets across generations. In all three cases you owe no US income tax on the receipt itself. A missed Form 3520 on a $500,000 foreign-parent gift creates up to $125,000 in federal penalty (25% statutory cap under §6039F); a foreign trust failure stacks at the $10,000 minimum per form per year under §6677. Many Bay Area immigrants discover the requirement three years late.

That disclosure is Form 3520 (and its companion Form 3520-A). Bay Area dual citizens, first-generation immigrants, and anyone with foreign family wealth ties get tripped up by these forms more than almost any other international filing. The numbers are big, the forms look obscure, and unlike domestic late-filing penalties, §6677 has never had a reliable first-time abatement safety valve. Reasonable cause is the only path most filers can count on.

This guide covers what triggers a 3520 filing, the brutal penalty structure under IRC §6677, why first-time abatement is generally not available for international penalties, and the streamlined offshore procedures that let most non-willful filers fix prior years for zero penalty. Our international tax practice handles these filings every season for Bay Area families with cross-border roots.

What Form 3520 Reports

Form 3520 is the annual disclosure a US person files to report four distinct categories of foreign activity. The form is filed by the US recipient or owner, attached to (but separately mailed alongside) the Form 1040, due April 15 with extensions to October 15 for individuals.

The four reportable events under IRC §6048 and §6039F:

1. Large gifts or bequests from a nonresident alien individual or foreign estate. Reportable when the aggregate from all related foreign individuals or estates exceeds $100,000 in the tax year. This is a statutory floor, not inflation-indexed.
2. Gifts from foreign corporations or foreign partnerships. Reportable when the aggregate exceeds the inflation-adjusted threshold ($19,570 for 2025; the 2026 figure is updated annually by IRS revenue procedure). Verify the current-year figure before filing.
3. Transactions with a foreign trust. Includes any transfer of money or property to a foreign trust, receipt of a distribution from a foreign trust, or loans between a US person and a foreign trust.
4. Ownership of a foreign trust under the grantor trust rules. If you are treated as the owner of any portion of a foreign trust under IRC §§671 through 679, you must report annually.

The threshold for category 1 has not changed since 1996, which is why so many first-generation immigrant families cross it without realizing. A $200,000 down-payment gift from parents in Taipei is a 3520 event. A $150,000 wedding gift from grandparents in Seoul is a 3520 event. A $300,000 inheritance from a parent who passed away in India is a 3520 event.

Form 3520 vs Form 3520-A: Who Files Which

This is the single most-confused piece of the regime. Two forms, two different filers, two different due dates.

Form 3520 is filed by the US person, meaning the recipient of the gift, the transferor to the trust, the beneficiary of the distribution, or the grantor-trust owner. Due with the individual's Form 1040 (April 15, extendable to October 15). See About Form 3520 at IRS.gov.

Form 3520-A is filed by the foreign trust itself, reporting the trust's activity, US owners, and US beneficiaries. Due by the 15th day of the third month after the close of the trust's tax year (March 15 for a calendar-year trust), with an automatic extension available via Form 7004. See About Form 3520-A.

The trap: most foreign trusts do not file Form 3520-A. They are governed by foreign law, have no US filing obligation under their home jurisdiction, and the trustees often refuse to sign IRS paperwork. When the foreign trust fails to file Form 3520-A, the US owner is required to file a substitute Form 3520-A as an attachment to their own Form 3520. The substitute filing obligation falls on the US beneficiary even though they do not control the trust.

Practical consequence: if you are the US beneficiary or grantor-trust owner of a Hong Kong, Singapore, UK, Cayman, or BVI trust, you are almost certainly responsible for the substitute 3520-A every year, even if you have never received a distribution.

The Brutal Penalty Structure (IRC §6677)

The penalties under IRC §6677 are unlike any other US tax filing penalty. They are assessed automatically the moment a late or incomplete form posts, and they are calculated on the gross value of the asset, not on any tax owed.

• Foreign trust reporting (transfers, distributions, ownership) under §6048: 35% of the gross reportable amount, or for §6048(b) ownership reporting, 5% of the gross value of the portion of the trust treated as owned by the US person. Penalty stacks at 5% per month until the form is filed, capped at 100% of the reportable amount.
• Foreign gift reporting under §6039F: 5% of the unreported gift per month, up to a maximum of 25% of the gift.
• Minimum penalty for §6677/§6048 trust failures: $10,000 per form per year, even if the percentage-based calculation would yield less. The $10,000 minimum applies to trust failures only and does not extend to §6039F gift penalties, which are capped at 25% of the gift.

Run the math on a real Bay Area family situation. A Singapore family trust with $5,000,000 in assets, US owner under the grantor rules, three years of missed 3520 and 3520-A filings. Penalty exposure: 5% × $5M × 3 years = $750,000, or 6 missed forms × $10K minimum = $60,000, whichever is greater. The percentage calculation wins, and the family is looking at three quarters of a million dollars in penalties on a trust they have never touched, on assets that have never produced US-taxable income to them.

The IRS has, in practice, assessed these penalties aggressively since the 2010 FATCA-era buildup. The Tax Court and several Circuit Courts have upheld the assessments where the taxpayer cannot establish reasonable cause.

First-Time Abatement Is Generally Not Available for §6677

The IRS's first-time penalty abatement (FTA) program is the administrative shortcut for taxpayers with a clean three-year compliance history to wipe out a single late-filing or late-payment penalty without proving reasonable cause. It works well for domestic Form 1040 and business-return penalties.

It does not work for international information-return penalties under §6677. Per the IRS's longstanding administrative posture documented in IRM 20.1.9 (International Penalties), FTA is generally not available for Form 3520 / 3520-A penalties. Some taxpayers have had isolated success arguing FTA via reasonable-cause framing in Appeals, but it has never been a routine grant the way domestic FTA is. Practitioners who treat §6677 like a §6651 late-filing penalty learn the hard way.

This means the only reliable path to relief is establishing reasonable cause under the Boyle line of cases, on a fact-by-fact written submission with documentation. The taxpayer carries the burden, and the IRS often says no. The voluntary-compliance side of the foreign trust regime is unforgiving by design.

Reasonable Cause Defenses Under Boyle

Reasonable cause for §6677 is fact-specific. The defenses the IRS has historically accepted:

• Reliance on a competent tax advisor. The taxpayer hired a CPA or EA, disclosed the foreign activity, and the advisor failed to file the 3520. Per United States v. Boyle, this defense generally requires that the failure was due to advice on a substantive question (not just "they forgot"), and the taxpayer provided full information.
• Unaware of the foreign source despite due diligence. The taxpayer did not know about the foreign trust or gift until after the deadline (for example, learning of an inheritance through a foreign probate process that took years).
• Foreign legal or cultural barrier to disclosure. A foreign trust governed by sharia inheritance law, a closely-held family trust where the trustees refused to provide information needed for the 3520, or a country whose privacy laws restricted the taxpayer's access to records.
• Serious illness, death in the family, or other genuine incapacity covering the filing window.

Pure ignorance of the law is not reasonable cause. "I didn't know I had to file" loses every time. The IRS expects a US person with foreign ties to either know the rules or hire someone who does.

Any reasonable cause submission needs documentation: engagement letters, email trails with the advisor, foreign probate records, medical records. We draft these submissions as detailed prosecutorial defenses, not as form letters.

Streamlined Offshore Procedures: The Best Available Off-Ramp

For non-willful filers, the IRS Streamlined Filing Compliance Procedures remain the cleanest path to fix missed 3520s, 3520-As, FBARs, and amended income tax returns in one coordinated package. Two flavors:

• Streamlined Foreign Offshore Procedures (SFOP). For taxpayers who meet the non-residency test in at least one of the most recent three years. Penalty: 0% miscellaneous offshore penalty. File 3 years of amended returns, 6 years of FBARs, and any missed 3520s, with a signed non-willful certification.
• Streamlined Domestic Offshore Procedures (SDOP). For US-resident taxpayers who do not qualify for SFOP. Penalty: 5% of the highest aggregate balance of foreign financial assets over the 6-year FBAR period. Same return / FBAR / 3520 submission package.

For most Bay Area immigrants who have lived in the US for years, SDOP applies. The 5% miscellaneous penalty applies to FBAR-reportable accounts, not necessarily to the gross value of a foreign trust if the trust itself is not a financial account the beneficiary controls. The 3520 penalty exposure is generally subsumed into the streamlined submission, which is the entire point of using the program.

Streamlined is non-willful only. If the IRS or DOJ concludes the failure was willful (intentional avoidance), streamlined eligibility is lost and the case moves into the IRS Criminal Investigation track. Honest assessment of willfulness is the threshold question on any streamlined case.

For broader FBAR context, see our companion piece on FBAR filing deadlines for Bay Area filers.

Worked Example: Bay Area Engineer, Hong Kong Wedding Gift

Mia is a software engineer in Mountain View. In June 2024 her parents, both Hong Kong residents (not US persons), wire her $500,000 as a wedding gift. She uses it as a down payment on a Sunnyvale condo. No US income tax is due on receipt because gifts from a nonresident alien are not US-taxable income to the donee.

Form 3520 was required by April 15, 2025 (extendable to October 15, 2025). Mia did not know. Her general-practice CPA prepared her 1040 but did not ask about foreign-source gifts. She files her 2024 return clean and never files a 3520.

In May 2026, while preparing 2025 with a new accountant, the issue surfaces. Her exposure if the IRS catches it on audit and denies reasonable cause:

• §6039F penalty: 5% of $500,000 per month, max 25% = $125,000.
• Or, depending on facts, the IRS may try to apply the §6677 minimum of $10,000 per form, but the gift category falls under §6039F so the 25% cap controls.

What we do for Mia: she is a US resident, so streamlined domestic (SDOP) applies. The 3520 was for a gift (not a financial account), so the 5% SDOP miscellaneous penalty does not attach to the $500K gift directly. She files the late 3520 inside the streamlined submission package with a non-willful certification, three years of amended returns showing no income tax change, and six years of FBARs (she had a $40K Hong Kong account from her university years she never reported). SDOP penalty applies only to the $40K FBAR balance: 5% × $40,000 = $2,000. The $500K gift carries no penalty inside the streamlined program. Total cost: $2,000 plus professional fees, vs $125,000 if she had ignored it and been caught.

What Goes Wrong Without a CPA Familiar with §6677

The most common mistake we see at intake: a general-practice CPA prepares the 1040 and never asks about foreign-source gifts, inheritances, or trust interests. The client mentions the wire transfer in passing months later. By then the 3520 deadline has passed; without a clean streamlined submission, the family faces a $125,000-cap penalty on a $500K gift versus the $2,000 streamlined outcome. The fix is to ask the question at intake, every year, of every client with cross-border family ties. Software does not flag this; the question has to be in the engagement workflow.

Common Bay Area Scenarios That Trigger 3520

• Down-payment gift from foreign parents. Common for Bay Area homebuyers from India, China, Taiwan, Hong Kong, South Korea, Singapore, Vietnam. Any single year over $100K triggers the form.
• Wedding gifts. Cultural norm of substantial parental gifts at marriage routinely crosses the threshold.
• Inheritance from a non-US parent. The death itself does not trigger US estate tax (the foreign decedent's estate is outside the US system if no US-situs assets), but the receipt by the US person beneficiary triggers Form 3520.
• Foreign trust set up by parents naming the US child as beneficiary. Especially common with Hong Kong, Singapore, BVI, Cayman, and Jersey family trusts.
• Foreign-grantor-trust beneficiary distributions. Distributions from a trust where the grantor is still alive and treated as the owner under §679 require 3520 reporting by the US beneficiary even if the income is ultimately reported by the grantor.
• Receipt of property under a foreign-jurisdiction probate. Real estate or financial accounts inherited through a foreign probate process count toward the $100K threshold at fair market value at the date of receipt.

Scope: What SVT Does and Does Not Do

SVT prepares Form 3520 and Form 3520-A as US international tax compliance. We file the substitute 3520-A when the foreign trust does not, we draft the reasonable cause statements, we run the streamlined submissions, and we coordinate with the IRS on penalty assessments.

We do not draft foreign trust instruments, advise on foreign trust formation, or handle non-US legal work. Foreign-jurisdiction trust formation is handled by your offshore counsel. We work alongside that counsel to make sure the trust structure is reportable in a clean, defensible way on the US side.

If you live in the Bay Area and have foreign family wealth, foreign trust beneficiary status, or have received a foreign gift over $100,000 in any year, the cost of a one-hour scoping call with our international team is a tiny fraction of the penalty exposure if you guess wrong. We see clients across Mountain View, Palo Alto, Cupertino, and the broader Bay Area for exactly this issue.

Action Items

• If you received more than $100K from a foreign individual or estate in any year: determine whether a 3520 was filed. If not, talk to an international tax CPA before the IRS finds it.
• If you are a beneficiary or owner of a foreign trust: assume substitute Form 3520-A is required unless you have written confirmation the trust files its own.
• If you have missed prior years: evaluate streamlined eligibility before any IRS contact. Streamlined eligibility is lost the moment the IRS opens an exam.
• If you are about to receive a large foreign gift or inheritance: set up the 3520 filing in advance so it goes in on time. Voluntary timely filing is free; the penalty is six figures.
• If your CPA has never asked you about foreign family money: get a second opinion. International disclosure is a specialty, and general 1040 practitioners frequently miss it.

When to Talk to Us

The §6677 penalty regime is one of the few places in the Internal Revenue Code where penalties on a non-tax disclosure can dwarf the tax on the underlying transaction. Because first-time abatement is generally not available for international penalties, there is no soft landing for filers who discover the requirement late. The streamlined procedures remain available but require a careful non-willfulness analysis and a coordinated submission.

Schedule a complimentary consultation with our international tax team. We will scope your foreign trust and gift exposure, assess streamlined eligibility, and lay out a remediation path before the IRS lays one out for you.