IRS Audits and Cook Islands Trusts

IRS examinations of Cook Islands trusts follow a predictable pattern. The IRS already knows the trust exists through FBAR filings, Forms 3520 and 3520-A, Form 8938, and FATCA reports from the foreign financial institutions holding trust accounts. An audit does not mean the IRS suspects fraud. It means the IRS wants to verify that the reported numbers are accurate and that the trust is being treated correctly for tax purposes.

A Cook Islands trust that has been properly reported every year since formation is in a different position from one with compliance failures. For a compliant trust, the audit is a documentation exercise. The problems arise when the trust has not been reported, when filings are inconsistent, or when the grantor cannot produce the records the IRS requests.

IRS Enforcement Focus on Foreign Trust Reporting

The IRS Large Business and International Division (LB&I) ran a compliance campaign on Forms 3520 and 3520-A, using examinations and campus-assessed penalties for late or incomplete forms. That campaign is no longer active. In May 2025, the IRS released a Practice Unit on Forms 3520 and 3520-A penalties, giving examiners detailed guidance on how to calculate and impose them.

FATCA made the information flow automatic. Foreign financial institutions holding Cook Islands trust accounts now report account balances, income, and beneficial ownership directly to the IRS. The IRS cross-references these institutional reports against the grantor’s FBAR, Form 8938, and Form 3520-A. A mismatch between what the bank reports and what the taxpayer files draws further examination.

What Triggers an Examination

Cook Islands trust examinations typically start from one of four sources.

FATCA cross-referencing. A discrepancy between the foreign bank’s report and the grantor’s filings (different account balances, missing income, or misidentified account holders) flags the return for review.

Form 3520 or 3520-A anomalies. Late-filed, incomplete, or internally inconsistent Forms 3520 and 3520-A attract attention. A Form 3520-A that reports trust income inconsistent with the amounts on the grantor’s Schedule E or Schedule B raises an obvious question.

Income-to-asset mismatch. A grantor who reports a Cook Islands trust on the income tax return but shows minimal trust income relative to the asset values on Form 8938 may trigger examination. The IRS can estimate expected returns based on asset types and compare them to reported income.

Campaign audits. The IRS periodically runs examination campaigns focused on specific international compliance areas. Foreign trust information returns were the subject of one such campaign.

What the IRS Examines

A Cook Islands trust audit focuses on three questions: Is the trust properly classified? Is all income reported? Have all required information returns been filed?

Grantor Trust Classification

The threshold issue in any Cook Islands trust examination is whether the trust is correctly classified as a foreign grantor trust under IRC sections 671 through 679. Cook Islands asset protection trusts are typically grantor trusts under Section 679, which treats a U.S. person who transfers property to a foreign trust with a U.S. beneficiary as the owner for income tax purposes.

If the IRS determines the trust is not a grantor trust, the tax treatment changes. The IRS may reach that conclusion because the trust deed was drafted incorrectly, because the grantor died and no one updated the classification, or because amendments changed the trust’s terms. Nongrantor foreign trusts are taxed as separate entities, distributions carry different tax consequences, and the throwback tax on accumulated income applies. Reclassification can produce substantial back taxes and penalties.

Income Reporting

The IRS verifies that all trust income flows through to the grantor’s personal return. For a Cook Islands grantor trust, interest, dividends, capital gains, and any other income earned within the trust structure must appear on the grantor’s Form 1040. The trust itself does not file a U.S. income tax return. The trustee files Form 3520-A as an information return, not a tax return.

Examiners typically request bank and brokerage statements for all accounts held within the trust structure, including accounts held by the underlying Cook Islands LLC or Nevis LLC if the trust uses an LLC holding structure. The IRS matches these statements against the income reported on the grantor’s return.

Information Return Completeness

The IRS examines whether every required information return was filed for every year under examination. The grantor’s own return is Form 3520, filed for the year. Form 3520-A is the foreign trust’s return, which the trustee signs and files, and the IRS holds the grantor answerable if it is not filed. An FBAR (FinCEN Form 114) is due for any year in which the structure’s foreign accounts together exceed $10,000 at any point. Form 8938 is due once the grantor’s specified foreign financial assets cross the reporting threshold.

Each form serves a different purpose and carries its own penalty structure. The FBAR goes to FinCEN, and the other three go to the IRS. A grantor who filed Form 3520 but missed FBAR has a compliance deficiency even if every dollar of income was correctly reported on the tax return.

Penalties for Noncompliance

Information return penalties for Cook Islands trusts apply even when all income was correctly reported and all taxes were paid. The penalties target the failure to file information returns.

Form 3520. A missing or incomplete Form 3520 triggers a penalty equal to the greater of $10,000 or 35% of the gross reportable amount, which on a transfer is the property’s gross value.

Form 3520-A. If the foreign trustee fails to file Form 3520-A, the U.S. grantor must file a substitute return. Missing this substitute triggers a penalty equal to the greater of $10,000 or 5% of the trust assets attributable to the grantor.

FBAR. Willful failure to file FBAR carries a penalty up to the greater of $165,353 (a statutory $100,000 amount adjusted for inflation) or 50% of the account balance. Non-willful violations carry a penalty of up to $16,536 per unfiled report.

Form 8938. The initial penalty for missing Form 8938 is $10,000, plus $10,000 for each 30-day period noncompliance continues after IRS notice, up to $50,000. The larger consequence falls on the income tax return itself. The assessment period stays open while the information is missing, and it runs for at least three years after the form is furnished. A failure due to reasonable cause and not willful neglect leaves open only the items the missing form would have reported.

Continuation penalties. If the IRS sends a notice of failure to comply and the forms remain unfiled for more than 90 days, additional penalties of $10,000 per 30-day period accrue until the gross reportable amount is reached.

Accuracy-related penalties. Standard accuracy-related penalties (20% of the underpayment) and fraud penalties (75% of the underpayment) apply if the examination discovers unreported income. For the portion of an underpayment attributable to an undisclosed foreign financial asset, IRC § 6662(j) raises that 20% rate to 40%.

Statute of limitations. The statute of limitations for Forms 3520 and 3520-A penalties does not begin running until a complete and accurate form has been filed. If no form was ever filed, there is no statute of limitations, and the IRS can assess penalties at any time.

Responding to an Examination

A grantor’s response to an IRS examination requires coordination between the U.S. attorney who structured the trust and the CPA or international tax counsel handling the compliance. The Cook Islands trustee will need to provide documents, but the trustee communicates through the U.S. attorney, not directly with the IRS.

Document Assembly

In a Cook Islands trust examination, the IRS requests three sets of documents.

• Trust formation documents, including the trust deed, any amendments, and LLC operating agreements.
• All Forms 3520, 3520-A, FBAR, and Form 8938 covering the examination years.
• Bank and brokerage statements for every account in the trust structure.

Assembling these documents before the first IRS meeting demonstrates proper administration and sets the tone for the examination.

The Reasonable Cause Defense

Penalties for late or missing Forms 3520, 3520-A, and FBAR can be abated if the grantor demonstrates that the failure was due to reasonable cause and not willful neglect. Reasonable cause exists when the taxpayer exercised ordinary business care and prudence but was unable to comply on time, or when the reporting error resulted from an honest misunderstanding of fact or law.

Reliance on a qualified tax adviser can satisfy the reasonable cause standard if the grantor disclosed all pertinent facts to the adviser and relied on their guidance in good faith. The determination is fact-specific. A grantor who hired a CPA experienced in international trust reporting and followed their instructions has a stronger reasonable cause argument than one who never asked about filing requirements.

Privileged Communications

Communications between the grantor and the U.S. attorney regarding trust formation and structure may be protected by legal privilege. A CPA’s tax advice to the grantor may carry the federally authorized tax practitioner privilege under IRC § 7525. That privilege can be asserted only in a noncriminal tax matter before the IRS or a noncriminal federal court proceeding brought by or against the United States. The grantor coordinates document production with counsel to preserve applicable privileges.

Trustee Confidentiality

Cook Islands law makes trust information private, with exceptions for a Cook Islands court order, a search warrant, a duty under another Act, and the trustee’s judgment about what administering the trust requires. When the IRS requests information from the trustee, the request goes through the grantor and the U.S. attorney. The trustee provides documents to the grantor’s representatives, who then produce them to the IRS. This process is standard and does not create an obstruction issue as long as the grantor cooperates with document production.

A grantor who refuses to seek the documents bears the cost of that refusal. In Eulich v. United States, No. 3:99-CV-1842-L (N.D. Tex.), the IRS spent more than five years demanding the records the trust’s Bahamian trustee held. The Fifth Circuit declined to disturb a finding that the settlor controlled those documents. In August 2004 the district court held him in civil contempt and fined him $5,000 a day, doubling to $10,000 after thirty days.

To get the documents, the settlor traveled to the Bahamas, obtained a legal opinion confirming that production was lawful, put up $500,000 in securities to reimburse the trustee if it were sued, and indemnified the trust’s one-man advisory committee. Four boxes holding 9,501 pages reached the government on September 30, 2004. The court refused to abate the fine, assessed $135,000, and treated the production as proof that the documents had been obtainable with some effort all along.

Voluntary Disclosure and Remediation

Grantors who discover past compliance failures before the IRS contacts them have several remediation paths, each with different penalty structures and eligibility requirements.

Streamlined domestic offshore procedures. Available to U.S. residents who can certify that their noncompliance was non-willful, meaning negligence, inadvertence, or a good-faith misunderstanding of the law. The procedures carry a miscellaneous offshore penalty on the unreported foreign financial assets.

Streamlined foreign offshore procedures. Available to qualifying non-residents who meet the same non-willfulness certification. These procedures impose no penalty.

Delinquent information returns with a reasonable cause statement. Available to taxpayers who have no unreported income but missed required information returns. The grantor files the delinquent forms and attaches a statement of reasonable cause, which the IRS reviews before assessing a penalty on the trust portion of Forms 3520 and 3520-A.

Voluntary Disclosure Program. For willful violations or cases involving potential criminal exposure, the IRS Voluntary Disclosure Program requires full disclosure and carries civil penalties higher than those under the other remediation paths.

All remediation options close once the IRS initiates an examination or contacts the taxpayer about the trust. Grantors who identify unfiled returns should consult international tax counsel immediately. The CPA handles tax filing; the attorney evaluates which remediation path fits the facts.