Form 3520-A: The Trust Files It, You File the Substitute, and the March 15 Deadline That Arrives Before Your Return

Of all the foreign information returns, Form 3520-A has the strangest ownership: the obligation belongs to the trust, the deadline is the trust's, and the penalty lands on the US person — who, in the Canadian context, is usually the only party who has ever heard of the form. The structure: a foreign trust with at least one US owner under the grantor trust rules must file Form 3520-A annually, reporting the trust's income, balance sheet, and distributions, and issuing statements to each US owner and US beneficiary; the trustee is the filer; the due date is the 15th day of the third month after the trust's year-end (March 15 for a calendar-year trust), extendable by six months with Form 7004 filed by the trustee before the deadline. When the trustee does not file — the normal case for a Canadian trust with a Canadian trustee who owes nothing to the IRS — the US owner's obligation activates: to avoid the penalty, the owner must ensure the form is filed, which in practice means completing a substitute Form 3520-A themselves and attaching it to their own Form 3520 (due with their income tax return, including extensions), with "substitute" marked at the top. The penalty for a missing or late 3520-A is the greater of US$10,000 or 5% of the gross value of the trust's assets treated as owned by the US person at the close of the year — a penalty that has historically been assessed automatically on late filings, and which the reasonable-cause and abatement guides address when it lands. Who this reaches in the corridor: US persons who are treated as owners of Canadian trusts under the grantor trust rules — the settlor of a Canadian family trust who retains powers or interests that make them the owner for US purposes; the person who transferred property to a Canadian trust with US beneficiaries (the rules deem a US transferor the owner in many configurations); and — the mass-market question — holders of Canadian registered accounts that are structured as trusts, principally the TFSA and RESP, where the US owner's contributions and control make the account a grantor trust owned by them in the view many practitioners have taken. On that last category, the IRS's 2020 revenue procedure exempted eligible individuals from Forms 3520 and 3520-A for certain tax-favored foreign trusts — retirement trusts and non-retirement savings trusts meeting listed conditions (contribution limits, tax-favored status in the foreign country, a purpose such as education, and information reporting to that country's authorities) — and whether a given TFSA or RESP qualifies is a fact-and-structure question on which practitioners take documented positions: many treat TFSAs and RESPs as within the exemption's non-retirement savings trust category and file neither form; others file protectively; the essential discipline is a documented position applied consistently year over year, with the substitute mechanics available when the protective route is chosen. The deadline trap has a specific shape: the US owner who believes the 3520-A can wait for their April return has already missed the March 15 trust deadline — the substitute attached to a timely Form 3520 is the cure, but the sequence only works if the owner understands that the 3520 (due with the return) carries the substitute 3520-A (whose own deadline has passed) and that the substitute is what avoids the penalty. Where the trustee is cooperative (a professional Canadian trust company, a family member willing to sign), having the trust itself file by March 15 — or file Form 7004 by March 15 for the extension — keeps the cleaner form of compliance; where the trustee is a Canadian bank administering a TFSA, cooperation is not available and the substitute route is the only one. The catch-up implication mirrors the other information returns: streamlined submissions for US owners of Canadian trusts attach the substitute 3520-As for each covered year alongside the 3520s; the delinquent international information return procedures cover the missed forms where all income was reported; and the form's penalty base — the trust's assets — is what makes a documented position on the TFSA and RESP question worth deciding deliberately rather than by default.

Key takeaways

• The trust files, the owner pays: Form 3520-A is the foreign trust's return, filed by the trustee, due March 15 for calendar-year trusts (extendable by Form 7004 filed by the trustee) — and the penalty for its absence lands on the US owner.
• The substitute is the owner's cure: when the trustee doesn't file, the US owner completes a substitute Form 3520-A and attaches it to their own Form 3520, due with their return — the only route when the trustee is a Canadian bank or an uninvolved relative.
• The penalty base is the trust: the greater of US$10,000 or 5% of the trust assets treated as the US person's — computed on assets, not income, which is why the form matters even for trusts earning little.
• Who's caught: US persons treated as owners of Canadian trusts under the grantor rules — family-trust settlors, US transferors, and, on many practitioners' view, TFSA and RESP holders unless the 2020 exemption applies.
• The TFSA/RESP position is a decision: the exemption for tax-favored non-retirement savings trusts may cover them; take a documented position, apply it consistently, and use the substitute route where filing protectively.
• Two deadlines, one sequence: March 15 (trust) then the return date (owner's 3520 with the substitute attached) — the owner who waits for April has missed the first and must use the second correctly.

The US owner's annual routine

January: confirm which Canadian trusts you are treated as owning (family trusts, TFSA and RESP under your documented position). February: for cooperative trustees, request the trust's 3520-A or a Form 7004 extension by March 15; for uncooperative or institutional trustees, gather the trust's year-end statement, income, and distribution figures. By your return deadline (with extensions): Form 3520 for each trust with the substitute 3520-A attached where the trust didn't file, statements to yourself as owner completed, the position on any exempt accounts noted in your file. The routine is an afternoon; the penalty for skipping it is computed on the trust's balance sheet.

Worked example

A US citizen in Ottawa is the settlor of a Canadian family trust (C$900,000, holding a rental property and investments) that she is treated as owning under the grantor trust rules, with her Canadian brother as trustee. She also holds a TFSA (C$70,000) and is subscriber of her children's RESP (C$55,000). The family trust: her brother has never heard of the IRS — the first year, the substitute route is used (substitute 3520-A completed from the trust's statements, attached to her Form 3520 with her extended return); from the second year, a professional trust administrator is retained and the trust itself files by March 15, with Form 7004 as the safety valve. The TFSA and RESP: after review, a documented position is taken that both fall within the 2020 exemption for tax-favored non-retirement savings trusts, the position memo is filed with her records, and no 3520 or 3520-A is filed for them — with the alternative (protective substitute filings each year) modeled and declined on the facts, and the position revisited annually as guidance evolves. The counterfactual she avoided: filing nothing for the family trust and receiving an automatically assessed penalty of 5% of C$900,000 — about US$33,000 — for a form whose existence her trustee could not have known about, followed by the reasonable-cause fight the abatement guides describe. Instead, a substitute 3520-A and a position memo, and the trust's assets never became a penalty base.

Official sources

"Form 3520-A is due by the 15th day of the 3rd month after the end of the foreign trust's tax year." If the foreign trust fails to file, "the U.S. owner must complete and attach a substitute Form 3520-A ... to the U.S. owner's Form 3520 ... to avoid being subject to the penalty," which 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." — Internal Revenue Service, Instructions for Form 3520-A, https://www.irs.gov/instructions/i3520a

"The IRS has ended its practice of automatically assessing penalties at the time of filing for late-filed Forms 3520, Part IV, which deal with reporting foreign gifts and bequests," and by the end of 2024 would "begin reviewing any reasonable cause statements taxpayers attach to late-filed Forms 3520 and 3520-A for the trust portion of the form before assessing any ... § 6677 penalty." — Taxpayer Advocate Service (IRS), NTA Blog: IRS Makes Favorable Changes to Foreign Gifts and Inheritance Filing Penalties, https://www.taxpayeradvocate.irs.gov/news/nta-blog/irs-hears-concerns-from-tas-and-practitioners-makes-favorable-changes-to-foreign-gifts-and-inheritance-filing-penalties/2024/10

Practitioner note

Form 3520-A is the information return whose filer doesn't know it exists and whose penalty lands on someone else — which is why our US-owner routine assumes the trustee won't file and builds the substitute into the owner's own return every year. The TFSA and RESP question gets a documented position rather than a default, revisited annually, because the alternative to deciding is a penalty computed on the account balance for a form the bank was never going to send.

See also: For Form 8938 and the FBAR side by side, see Form 8938 and the FBAR side by side; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the foreign-trust owner routine — grantor-trust ownership determination, trustee filing or Form 7004 by March 15 where cooperative, substitute 3520-A preparation and attachment to Form 3520 otherwise, and the documented TFSA/RESP exemption position. See cross-border pricing or book a call.