If a U.S. person creates, funds, or is treated as the owner of a foreign trust, Form 3520-A is the trust-level return the IRS expects every year, and it trips up filers because the foreign trustee usually will not prepare it and the deadline is earlier than people expect. This guide explains who files Form 3520-A, the substitute-return rule, the March 15 deadline, the penalties, and how it works alongside Form 3520.
What Is Form 3520-A?
Form 3520-A is the Annual Information Return of a Foreign Trust With a U.S. Owner. It reports, at the trust level, the foreign trust's income statement and balance sheet, and it produces two key statements: a Foreign Grantor Trust Owner Statement that flows to the U.S. owner (who needs it to complete their Form 3520) and a Foreign Grantor Trust Beneficiary Statement for U.S. beneficiaries who receive distributions.
Who Is a "U.S. Owner" of a Foreign Trust?
A U.S. person is treated as the owner of a foreign trust under the grantor-trust rules in Sections 671 through 679. The most common trigger is Section 679, which treats a U.S. person who transfers property to a foreign trust that has (or could have) a U.S. beneficiary as the owner of the portion of the trust attributable to that transfer.
Common Ways a U.S. Person Becomes a Foreign-Trust Owner
Reference- Funding a foreign trust: a U.S. person settles or contributes assets to a trust organized abroad that has any U.S. beneficiary (Section 679).
- Retained powers: a U.S. person holds powers over the trust (to revoke, control beneficial enjoyment, or benefit from income) that make them a grantor-trust owner under Sections 673 to 677.
- Migration: a previously foreign grantor becomes a U.S. person, or a domestic trust becomes foreign, pulling the trust into the U.S. owner rules.
- Certain foreign pensions and savings arrangements that are structured as trusts, unless they qualify for relief under Revenue Procedure 2020-17.
When a U.S. person is the owner, the trust's income is taxed to that owner currently, and Form 3520-A reports the trust's activity to support that taxation.
Who Actually Files Form 3520-A, and What Is a Substitute Return?
Technically, the foreign trust is responsible for filing Form 3520-A and furnishing the owner and beneficiary statements. In practice, foreign trustees frequently will not file U.S. forms, so the law puts the burden on the U.S. owner.
The Substitute Form 3520-A
If the foreign trust does not file Form 3520-A by the deadline, the U.S. owner must complete and attach a substitute Form 3520-A to their own Form 3520 by the Form 3520 due date, to avoid the penalty. In other words, the U.S. owner cannot simply point to an uncooperative trustee, the obligation, and the penalty, flow to them. Preparing the substitute return requires the trust's financial statements translated into U.S. dollars and U.S. accounting concepts, which is why this filing benefits from professional preparation.
When Is Form 3520-A Due?
Form 3520-A is due by the 15th day of the third month after the end of the trust's tax year, which is March 15 for a calendar-year trust, with a six-month extension to September 15 available via Form 7004.
The Deadline Mismatch That Causes Missed Filings
CautionThe two foreign-trust forms have different deadlines, and the mismatch is a frequent source of penalties:
- Form 3520-A: due March 15 (calendar-year trust), extendable to September 15 via Form 7004.
- Form 3520: due with the U.S. owner's income tax return, April 15, extendable to October 15.
A U.S. owner who assumes both forms follow the April 15 individual deadline can miss the earlier March 15 Form 3520-A date by a month and trigger the penalty. Calendar the March 15 date separately, or file Form 7004 for the trust.
What Is the Penalty for Not Filing Form 3520-A?
The penalty under Section 6677(b) is the greater of $10,000 or 5% of the gross value of the portion of the trust's assets treated as owned by the U.S. person at the close of the year. Additional penalties can accrue if the failure continues after the IRS issues notice, and the penalty is generally imposed on the U.S. owner, not the foreign trust.
Because the 5% figure is based on trust asset value, not income, a large trust can generate a substantial penalty even in a year with little or no income. Reasonable-cause relief is available where the U.S. owner can show the failure was due to reasonable cause and not willful neglect, but relying on an uncooperative foreign trustee is generally not, by itself, reasonable cause, which is exactly why the substitute return exists.
How Does Form 3520-A Work With Form 3520 and Other Filings?
Form 3520-A almost never stands alone. A U.S. owner of a foreign trust typically has a cluster of obligations:
- Form 3520-A reports the trust's income, balance sheet, and owner and beneficiary statements (due March 15).
- Form 3520 reports the U.S. owner's ownership and any transfers or distributions (due with the 1040).
- The FBAR (FinCEN Form 114) reports the trust's foreign financial accounts if the U.S. person has a financial interest or signature authority.
- Form 8938 (FATCA) may report the trust interest as a specified foreign financial asset.
- The trust's income, because the U.S. person is the owner, is reported on the owner's Form 1040 under the grantor-trust rules.
When prior-year Form 3520-A filings were missed alongside unreported foreign income, the Streamlined Filing Compliance Procedures, the SFOP track for those abroad or the SDOP track for residents, are usually the cleanest correction path.
Bottom Line
Form 3520-A is the annual trust-level return for a foreign trust with a U.S. owner, and its danger lies in the details: the foreign trustee usually will not file it, the U.S. owner bears the penalty, the March 15 deadline is earlier than the related Form 3520, and the penalty is based on trust asset value rather than income. The fix is to identify ownership under the grantor-trust rules early, calendar the March 15 date, file a substitute return when the trustee will not, and keep Form 3520-A and Form 3520 consistent.
If you created, funded, or are treated as the owner of a foreign trust, or you discovered a missed Form 3520-A in a prior year, our international tax and estate and trust tax teams can prepare the return (including a substitute filing) and coordinate it with your Form 3520, FBAR, and FATCA obligations. Have questions about Form 3520-A or foreign trusts? Contact TS CPA for a free consultation. We respond within the same day.