A reasonable-cause request begins with an accurate history and supporting records. Before drafting an explanation for a late Form 3520, confirm the reporting requirement, the applicable deadline, and the facts that caused the omission. A generic letter cannot supply missing evidence.
This article provides a records checklist. Our Form 3520 guide explains the broader reporting and penalty rules; the delinquent-return guide covers correction procedures.
First Confirm That a Required Filing Was Missed
Review residency, donor identity, ownership, gift characterization, value, and aggregation. A large overseas wire is not enough to establish every element. Identify the affected year and check extensions or special relief against documentary proof.
If the recipient was moving to the United States, begin with the residency timeline. If relatives transmitted the funds, map the actual donor and intermediary chain.
Build a Chronology Before Writing the Explanation
- Transaction: when did the gift or other covered event occur, and what records establish it?
- Original filing period: what did you do to identify obligations and prepare returns?
- Advice: whom did you consult, what information did you provide, and what advice did you receive?
- Omission: what specific circumstances prevented or affected compliance?
- Discovery: when and how did you learn that a form might be missing?
- Correction: what steps did you take, on what dates, and what remains outstanding?
Separate documents from recollection. Mark a date as approximate when necessary. A chronology that acknowledges gaps is more useful than one that creates false precision.
Match Each Important Statement to Evidence
- Prior returns and filing acknowledgments.
- Extension requests and acceptance records.
- Preparers’ questionnaires, engagement scopes, and correspondence.
- Documents supplied to advisers and proof of when they were supplied.
- Bank, gift, ownership, and immigration records relevant to the obligation.
- Records supporting any illness, disruption, or access problem actually relied upon.
- IRS notices, envelopes, response dates, and proof of corrective filings.
If your explanation concerns professional advice, distinguish advice about the income-tax treatment of a gift from advice about Form 3520. Record the question asked and the information the adviser had. Do not turn silence or an assumption into an affirmative instruction that was never given.
What the Current IRS Procedure Says
The IRS directs eligible taxpayers with delinquent international information returns to follow normal filing procedures, with Forms 3520 and 3520-A filed under their own instructions. Current guidance says reasonable-cause statements attached to those two forms are considered before a penalty is assessed and instructs filers to identify the attachment on the first page. See the IRS delinquent information-return procedures.
This is not guaranteed relief. Section 6039F provides a reasonable-cause exception to the foreign-gift reporting penalty where the failure was not due to willful neglect. The taxpayer must support the applicable standard. Foreign-trust events involve different statutory provisions and need separate analysis.
Language Difficulties and Lack of Awareness Are Facts to Examine
Describe actual communication difficulties, attempts to obtain advice, and what the person understood at the time. Avoid asserting that limited English or unfamiliarity with a form automatically establishes reasonable cause. Explain the connection between the circumstances and the missed filing, with records where available.
A written explanation should also distinguish why the omission occurred from why it continued. Identify discovery and subsequent action rather than stopping the chronology at the original deadline.
A Working Checklist for Your Consultation
Prepare four short lists: established facts; supporting documents; missing records; and unresolved questions. Bring the complete IRS notice if one has arrived. Identify any response deadline at the outset.
If foreign income was omitted or other forms were missed, assess the broader compliance problem before choosing a filing package. IRS contact, examination status, and the facts surrounding the conduct can affect the available approach. See international tax penalties.
Frequently Asked Questions
Is a template reasonable-cause letter enough?
A template can organize headings. It cannot establish your history, evidence, or the applicable legal standard.
What if I have already received a penalty notice?
Preserve the notice and its deadline. A response to an assessed penalty needs review of that procedural posture.
Should I state uncertain facts as definite?
No. Identify the uncertainty and the evidence needed to resolve it.
Discuss the Filing History and Supporting Evidence
Schedule a $500 Tax Attorney Consultation with Philip M. Falco, Attorney & CPA. Up to one hour of total attorney time includes review, analysis, preparation, and the telephone consultation combined. Preparation, filing, notice responses, and ongoing representation require a separate written engagement.
General information, updated October 9, 2026. Reasonable-cause relief depends on the form, applicable law, facts, evidence, and procedural posture.