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The trustee of a foreign trust goes quiet as March 15 approaches, and the U.S. owner is left holding a filing obligation that was never theirs to begin with. When the trustee will not file, you attach a substitute Form 3520-A to your own Form 3520 by your deadline, which is the move that keeps the penalty off your desk.
Form 3520-A is the foreign trust's annual information return, reporting Part II income, the Part III balance sheet, and total distributions on Line 17a. The standard due date is the 15th day of the third month after the trust's year end, and an automatic six month extension is available with Form 7004 filed under the trust's EIN.
Key Takeaways
- Form 3520-A is the foreign trust’s annual information return. It reports the trust’s income, balance sheet, and allocations to U.S. owners and beneficiaries. The trustee files it, not you, unless you must file a substitute.
- Standard due date is the 15th day of the third month after the trust’s year end, for example, March 15 for a calendar-year trust. An automatic six month extension is available with Form 7004, filed using the trust’s EIN.
- Mail the return to the IRS Service Center, P.O. Box 409101, Ogden, UT 84409. Keep dated proof of mailing and delivery.
- If the trustee will not file, attach a substitute Form 3520-A to your Form 3520 by your Form 3520 deadline to help avoid penalties.
- Penalties can be steep, generally the greater of 10,000 or 5% of the year end gross value of the portion you own, plus 10,000 continuation fines for each 30 days after 90 days from IRS notice. Reasonable cause relief may apply.
What is Form 3520-A?
Form 3520-A is the annual information return a foreign trust files when any portion is treated as owned by a U.S. person under the grantor trust rules. It functions like a yearly “report card” for the trust. It includes the trust’s income statement and balance sheet, plus two critical schedules, the Foreign Grantor Trust Owner Statement and the Foreign Grantor Trust Beneficiary Statement. Copies of these statements must be furnished to each U.S. owner and each U.S. beneficiary who received a distribution for the year (the term distribution captures direct AND indirect transfers, loans other than qualified obligations, and uncompensated use of trust property, and it reaches any U.S. recipient even when that person is not formally named as a beneficiary in the trust instrument).
In practice, here is what that means for you:
- The trustee completes the Form 3520-A package.
- The trustee gives every U.S. owner the Owner Statement and every U.S. beneficiary the Beneficiary Statement by the same third month due date, unless extended.
- The return is filed with the IRS separately from any individual tax returns.
Accuracy, timeliness, and documentation matter because penalties attach to the U.S. owner if the foreign trust fails to file completely and on time. We cover those details, and how to get relief, in the penalties section below.
Who actually files it?
By default, the foreign trustee files Form 3520-A. If the trustee does not file, the U.S. owner must attach a substitute Form 3520-A to a timely filed Form 3520 to help mitigate penalties. Think of the substitute as your backstop, you do the best you can with the information available, you sign it, and you attach it to Form 3520 by your deadline.
The calendar you should trust
- Due date, the 15th day of the third month after the trust’s year end.
- Extension, file Form 7004 by the original due date for an automatic six month extension, using the trust’s EIN.
- Furnish statements to U.S. owners and beneficiaries by the same deadline, or later if extended.
A quick story you may recognize
A firm we spoke with had a calendar-year foreign trust and a March 15 deadline approaching. The trustee was overseas and slow to respond. The team set two tracks, they filed Form 7004 using the trust’s EIN to lock in an automatic six month cushion, and they prepared a substitute Form 3520-A package that could be attached to the U.S. owner’s Form 3520 if the trustee still did not deliver. That two-track plan prevented a penalty letter and calmed a very anxious client. You can adopt the same playbook.
Who must ensure Form 3520-A is filed, roles that really matter
The trustee has the filing duty, but the U.S. owner is responsible for ensuring compliance. If the trustee does not file, the U.S. owner must step in with a substitute filed with a timely Form 3520.
Trustee responsibilities
- Prepare a complete Form 3520-A package that includes the Owner and Beneficiary Statements.
- File the return with the IRS by the third month deadline, or extend with Form 7004.
- Furnish the statements to each U.S. owner and each U.S. beneficiary on time.
U.S. owner responsibilities
- Confirm the trustee has filed and furnished the statements.
- If the trustee will not file, complete a substitute Form 3520-A to the best of your ability and attach it to your timely Form 3520, signed by you.
- Track values, ownership percentages, and any distributions so you can complete your Form 3520 accurately.
Filing deadlines and extensions
The standard due date is the 15th day of the third month after the trust’s year end. For a calendar-year trust, that is usually March 15. You can secure an automatic six month extension by filing Form 7004 by the original due date, and you must use the trust’s EIN on that extension. The extension covers Form 3520-A and its statements, it does not extend your Form 3520 unless you also extend that separately.
- Calendar-year example, due March 15, extended due September 15 with a timely Form 7004.
- Fiscal-year example, due date moves with the trust’s year end, always the 15th day of the third month after.
- Substitute filing exception, if filing a substitute Form 3520-A with your Form 3520, your due date is your Form 3520 due date.
Where and how to file
Mail Form 3520-A to the IRS Service Center at P.O. Box 409101, Ogden, UT 84409. The instructions direct you to file with this address and to furnish statements by the same timeline. Use a trackable mailing method and keep proof of on-time filing.
What to include in a complete package
- The signed Form 3520-A.
- Foreign Grantor Trust Owner Statement for each U.S. owner, together with an attached explanation of the facts and law (including the specific IRC section, typically §§671 to 679) that establishes the trust is treated for U.S. tax purposes as owned by the U.S. person; attaching the trust documents alone is not enough.
- Foreign Grantor Trust Beneficiary Statement for each U.S. beneficiary who received distributions.
- Authorization of U.S. Agent, if applicable, and any required attachments noted in the instructions.
Practical workflow, so you do not get stuck on March 14
- Create a single-page checklist for each trust with the year end, due date, extended due date, EIN, and trustee contact.
- Set calendar reminders for 30, 15, and 7 days before the due date, then again at 60 and 30 days before the extended due date if extended.
- Ask trustees early for a draft package and for confirmations that Owner and Beneficiary Statements will be furnished on time.
- If there is any doubt, prepare a substitute Form 3520-A draft so you can file with your Form 3520 on time.
Small habit, big payoff, save a PDF of the filed package, mailing label, and delivery confirmation in the client’s permanent file. Future you will thank you.
Penalties, what triggers them and how to keep them off your desk
If the foreign trust fails to file a timely and complete Form 3520-A, the U.S. owner faces an initial penalty equal to 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 year end. If the IRS sends a notice and the failure continues more than 90 days, additional 10,000 continuation penalties can apply for each 30 days or part thereof, subject to a cap at the gross reportable amount.
What counts as “failure”
- Late filing or not filing.
- Missing required statements or required attachments.
- Incorrect or incomplete information in the return.
Good news, there are relief paths
The law allows relief when you show reasonable cause and that you acted with ordinary business care and prudence. The IRS guidance also confirms that attaching a complete substitute Form 3520-A to your timely Form 3520 can help you avoid the penalty when the trustee did not file. The key is to act before your due date, document your efforts to obtain information, and fix the issue quickly.
Reasonable cause, how to frame it
If you missed or could not file because of circumstances beyond your control, explain what happened, what you did to comply, and how quickly you corrected the issue once it was discovered. Support your statement with dates, emails, courier receipts, and any correspondence with the foreign trustee. Keep the tone factual and concise.
Suggested outline you can adapt:
- State the facts, including trust year end, due date, and what prevented timely filing.
- Detail your ordinary business care, for example, early requests to the trustee, follow ups, and attempts to obtain balances.
- Show prompt corrective action, for example, filing a substitute with Form 3520 as soon as you realized the trustee would not file.
- Attach proof, include correspondence logs, mailed notices, and delivery confirmations.
Programs and procedures that sometimes help
- Substitute Form 3520-A with a timely Form 3520, this is the first and best mitigation step if the trustee fails.
- Appeals, if a §6677 penalty is assessed, you can present reasonable cause in IRS Appeals and request abatement. Referencing the Internal Revenue Manual sections on §6677 can help explain how penalties are computed and the separate nature of each filing requirement.
- Keep perspective, penalties for Form 3520 and Form 3520-A are separate and can both apply, so cure all open years and both forms when needed.
Act early. A clean substitute filed with your timely Form 3520 is often the difference between no penalty and a very long, very avoidable back-and-forth.
Form 3520 vs. Form 3520-A, what changes from one to the other
Here is the side-by-side comparison most readers want.
| Item | Form 3520 | Form 3520-A |
| Who files | You, the U.S. person reporting transactions with a foreign trust and certain foreign gifts | The foreign trustee, unless you must file a substitute |
| What it covers | Transfers to a foreign trust, ownership information, and distributions received, plus certain gifts | Trust income statement, balance sheet, and Owner and Beneficiary Statements |
| Standard due date | Your income tax return due date, typically April 15 for individuals, extensions via Form 4868 | 15th day of the third month after the trust’s year end, for example March 15 for calendar-year trusts |
| Extension form | 4868 for individuals, 7004 for some entities | 7004, filed with the trust’s EIN |
| Substitute filing option | Not applicable | Yes, attach a substitute to your timely Form 3520 if the trustee will not file |
| Penalties | Separate penalties apply under §6677 | Separate penalties apply under §6677 |
Sources, IRS instructions for both forms.
U.S. agent, why it matters more than you think
If the trust appoints a U.S. agent under section 6048(b), the IRS can serve notices and obtain records domestically, which can streamline exams and reduce friction, and the trust is also relieved from attaching the underlying trust documents (trust instrument, agreement summaries, memoranda of wishes, subsequent variances, and organizational chart) to Form 3520-A. The instructions include a model Authorization of Agent agreement and suggest attaching it every three years, or sooner if there is a change. If there is no U.S. agent, the IRS may determine amounts required to be reported based on available information, which can increase risk for the U.S. owner.
Your action list:
- Confirm whether a U.S. agent has been appointed, and document it.
- Include the year the Authorization of Agent was last attached on Form 3520-A.
- Re-attach the Authorization every three years or when details change.
Exceptions for certain retirement, education, and medical trusts
Two narrow buckets can be out of scope for §6048 reporting for eligible individuals, Canadian RRSPs and RRIFs under Rev. Proc. 2014-55, and certain tax favored foreign retirement and nonretirement savings trusts under Rev. Proc. 2020-17. These exceptions do not change your possible obligations under FATCA Form 8938 or FBAR. Always confirm your facts against the revenue procedures and keep copies of plan documents.
Rev. Proc. 2020-17, what qualifies
Rev. Proc. 2020-17 exempts eligible individuals from Form 3520 and Form 3520-A reporting for certain tax favored foreign retirement trusts and certain tax favored foreign nonretirement savings trusts, such as plans organized and operated exclusively or almost exclusively to provide retirement, medical, disability, or educational benefits. It also outlines how eligible individuals can seek abatement or refunds of past §6677 penalties. Read the eligibility definitions closely before relying on the exemption.
Reminder, the Rev. Proc. 2020-17 and 2014-55 exemptions do not remove FATCA Form 8938 or FBAR reporting when those separate rules apply.
Missed deadlines, how to get back to compliant quickly
If the trustee missed the deadline, do not wait. Complete a substitute Form 3520-A to the best of your ability and attach it to your timely filed Form 3520, including extensions. Sign the substitute yourself. Include as much supporting information as you can, for example, year end balances, income summaries, and any trustee statements you have. This step is often the cleanest way to prevent or mitigate §6677 penalties.
A tight recovery plan
- Confirm the trust year end and compute the exact due date.
- If still on time, file Form 7004 with the trust’s EIN to secure six more months.
- If already late, prepare and file the most complete substitute you can with your Form 3520.
- Draft a reasonable cause statement if facts support it, attach evidence, and be ready to present it if the IRS assesses a penalty.
Tips to avoid common filing errors
- Use the trust’s EIN on Form 3520-A and on Form 7004, do not use an SSN or ITIN for the trust.
- Reconcile names and EINs across the return and both statements.
- Confirm that Owner and Beneficiary Statements were furnished on time.
- Keep mailing proofs, certified mail or trackable delivery, and save PDFs of everything.
- If there is no U.S. agent, revisit that decision each year, the lack of an agent can increase risk.
Operational help for busy firms
If your firm struggles every March because Form 3520-A work is stuck in review loops, consider tightening SOPs around data intake, statement furnishing, and substitute preparation. A disciplined workflow protects client trust and margins. When firms need added capacity without losing control of quality or security, Accountably can integrate trained offshore teams into your workflow so you hit every due date while protecting review time and file integrity. Use this only where it supports your standards, your templates, and your clients’ expectations.
Conclusion
You now have a clear checklist. Lock in the right deadline, file Form 7004 on time when needed, confirm that the trustee filed and furnished statements, and be ready with a substitute Form 3520-A attached to your timely Form 3520 if the trustee does not. Document everything. That is how you keep penalties off your desk and give your clients a calm, predictable process.
Compliance note, this article is general information, not tax advice. Confirm your facts with a qualified tax advisor. IRS references last reviewed October 22, 2024 for the 3520-A instructions and accessed December 1, 2025.
Sources
- IRS, Instructions for Form 3520-A, including When and Where to File, penalties, extensions, and U.S. agent provisions.
- IRS, Instructions for Form 3520, including substitute filing guidance and penalties.
- IRS, Internal Revenue Manual, International Penalties §8.11.5, and §20.1.9 on §6677 penalties and separate filing requirements.
- IRS, Rev. Proc. 2020-17, exemptions for certain tax favored foreign retirement and savings trusts.
Common Mistakes We See Every Season
The same Form 3520-A mistakes show up year after year, and every one of them lands as a late-spring fire drill. Here are the five we see most often and the SOP-style fix for each.
Reusable Checklists
These checklists are copy-paste ready for firm SOPs. Drop them into your engagement folder, your TaxDome workflow, or your internal review template, and walk every Form 3520-A through them before the foreign trust's tax year closes.
Pre-file packet for Form 3520-A
- Confirm at least one U.S. owner of the foreign trust for the tax year under IRC §6048(b).
- Decide who files: foreign trustee directly, or U.S. owner via substitute Form 3520-A.
- Pull the trust's beginning-of-year and end-of-year trial balance, line by line, for Part III lines 1 through 21.
- Pull income statement totals from the trust's books and records for Part II lines 1 through 16.
- Translate every foreign-language document to English and convert every amount to U.S. dollars.
- Confirm tax year (calendar or fiscal) and enter the beginning and ending dates at the top of the form.
- Check the correct top-of-form box: initial, final, amended, extension filed, or substitute.
- Pair the filing with each U.S. owner's Form 3520 for the same year.
U.S. agent versus no-agent decision check
- Has the foreign trust appointed a U.S. agent? Confirm yes or no in writing before drafting.
- If yes, capture U.S. agent name, TIN, and address on Line 3 of Part I.
- If yes, no underlying trust documents need to be attached to Form 3520-A.
- If no, attach the trust instrument, written or oral agreement summary, memoranda or letters of wishes, subsequent variances, and the organizational chart (Lines 2a through 2e).
- If documents were attached on a Form 3520-A filed within the past 3 years, attach only the relevant updates this year.
- For the Beneficiary Statement in a no-agent year, confirm the trust's written position on IRS and beneficiary inspection of permanent books and records.
Owner and Beneficiary Statement distribution check
- Prepare one Foreign Grantor Trust Owner Statement per U.S. owner. Never combine multiple owners into one statement.
- Prepare one Foreign Grantor Trust Beneficiary Statement per U.S. beneficiary who received a distribution, regardless of amount.
- Attach an IRC explanation (typically §§671 to 679) to each statement establishing grantor-trust treatment.
- Capture indirect distributions, loans (other than qualified obligations), and uncompensated use of trust property as reportable on the Beneficiary Statement.
- Include distributions to U.S. persons who are not formally designated beneficiaries of the trust.
- Confirm Line 17a includes total distributions to all persons (U.S. and foreign), with U.S. owners itemized on Line 17b and U.S. beneficiaries on Line 17c.
- Send a copy of each statement to the respective U.S. owner and U.S. beneficiary so they can attach it to their own Form 3520.
Keep 3520-A Season From Stalling
Form 3520-A does not move on the same cadence as the rest of the tax book. A foreign trust with at least one U.S. owner files annually under IRC §6048(b), and when the foreign trustee will not file, the U.S. owner files a substitute Form 3520-A in its place (per IRS Form 3520-A instructions, Rev. December 2023). Trust documents, U.S. agent decisions, IRC §671 to 679 analysis, currency translation, and the Part III balance sheet all collide in the same window the rest of your individual returns are stacking up.
The stall almost always comes from the same place: information arriving late from the foreign trustee, no clear owner of the U.S. coordination, and Part III balance sheet values that nobody has rolled forward from last year. The fix is not more hours, it is a clean workflow built around the form's actual structure.
- Lock the trustee-versus-substitute decision before the trust's tax year closes, so the U.S. owner is not waiting on a foreign cooperative party near the deadline.
- Build the Part III balance sheet as a two-column workpaper mapped to lines 1 through 21, with beginning-of-year tied to last year's filed Form 3520-A and end-of-year tied to the trust's books.
- Standardize the grantor-trust IRC memo as a one-page template (citing §§671 to 679 where applicable) attached to every Owner Statement and Beneficiary Statement.
- Run a Line 17a reconciliation: total distributions to all persons should match Line 17b (U.S. owners) plus Line 17c (U.S. beneficiaries) plus any foreign-recipient supporting schedule.
- Pair every Form 3520-A engagement with the matching Form 3520 filing for each U.S. owner and U.S. beneficiary on one calendar.
This is the kind of structured execution our team handles inside client workflows every season. If Form 3520-A is part of a broader foreign-information return book that is pulling senior reviewers off other work, see our taxation services for how Accountably builds production capacity around it.
FAQs
What is Form 3520-A for?
It is the annual information return for a foreign trust with a U.S. owner. It reports the trust’s income and balance sheet and includes Owner and Beneficiary Statements that must be furnished to U.S. owners and beneficiaries. The trustee files it unless you must file a substitute.
What is the difference between Form 3520 and Form 3520-A?
You file Form 3520 to report your transactions with a foreign trust and certain foreign gifts. The trustee files Form 3520-A as the trust’s annual information return. Deadlines, extensions, and penalties are separate, and you may need to file a substitute Form 3520-A with your Form 3520 if the trustee does not file.
Who needs to file Form 3520-A?
The foreign trustee files Form 3520-A when a U.S. person is treated as owning any portion of the trust under the grantor rules. If the trustee does not file, the U.S. owner must ensure compliance by attaching a substitute to a timely Form 3520.
Where do I mail Form 3520-A?
Mail it to Internal Revenue Service Center, P.O. Box 409101, Ogden, UT 84409. Use a trackable method and keep proof of mailing and delivery.