Cayman Islands

Trust law framework

The Cayman Islands trust regime is governed by the Trusts Act (2024 Revision), derived from English common law but substantially modernized through statutory amendments. The jurisdiction imposes no income tax, no capital gains tax, and no estate or inheritance tax. There is no U.S.–Cayman Islands income tax treaty.

For U.S. tax purposes, a Cayman trust is a foreign trust under Treas. Reg. §301.7701-7 unless both the court test and the control test are satisfied to make it domestic. In practice, virtually all Cayman trusts are foreign trusts. The absence of a tax treaty means there is no treaty-based deferral or exemption for income earned within the trust, and no mechanism to reduce the information reporting burden.

STAR trusts and purpose trusts

The Special Trusts (Alternative Regime), known as STAR, is codified in Part VIII of the Trusts Act. STAR trusts may be established for persons, purposes, or both. Unlike ordinary trusts, STAR trusts are enforced by a designated "enforcer" rather than by beneficiaries, which means that beneficiaries may have no standing to compel distributions or to obtain information about the trust.

This enforcement structure creates genuine complexity for U.S. classification. Under the grantor trust rules (IRC §§671–679), a U.S. person who transfers property to a STAR trust may still be treated as the owner for U.S. tax purposes, particularly if the trust is revocable or if the grantor retains certain powers. However, the absence of beneficiary standing can affect the analysis under IRC §679 (which looks at whether the trust has a U.S. beneficiary) and under the distribution reporting requirements of §6048(c).

Practitioners should analyze each STAR trust on its specific terms. The existence of an enforcer who is not a beneficiary, and the potential for purpose-only STAR trusts with no individual beneficiaries, raises classification questions that the IRS has not directly addressed in published guidance.

Fund structures

The Cayman Islands is the dominant domicile for offshore investment funds. Many hedge funds, private equity funds, and venture capital funds use Cayman entities, including unit trusts, exempted limited partnerships with trust components, and master-feeder structures where the offshore feeder may be organized as a trust.

A U.S. person who invests in a Cayman fund structured as a unit trust is investing in a foreign trust. Depending on the structure, the U.S. investor may be treated as the owner of a portion of the trust (triggering Forms 3520 and 3520-A) or as a beneficiary receiving distributions (triggering Form 3520 Part III). However, many fund entities are classified as corporations or partnerships for U.S. tax purposes under the check-the-box regulations (Treas. Reg. §301.7701-2 and -3), which takes the arrangement outside the foreign trust reporting regime.

Practitioners should obtain the fund's U.S. tax classification before assuming that Form 3520 does not apply. A fund that has not filed Form 8832 and is structured as a trust under Cayman law will default to trust classification for U.S. purposes.

Reporting obligations and penalties

A U.S. person who creates or transfers property to a Cayman trust must report the transfer on Form 3520 Part I (§6048(a)). A U.S. person treated as the owner of a Cayman trust must file Form 3520-A and Form 3520 Part II annually (§6048(b)). A U.S. person who receives a distribution from a Cayman trust must report it on Form 3520 Part III (§6048(c)).

Failure-to-file penalties under §6677(a) are 35% of the gross reportable amount for Parts I and III of Form 3520. For Part II (U.S. owner reporting) and Form 3520-A, the penalty under §6677(b) is the greater of $10,000 or 5% of the gross reportable amount. Continued failure after IRS notice adds $10,000 per 30-day period.

Because the Cayman Islands imposes no income tax, there are no foreign tax credits to offset the U.S. tax on trust income. All income earned by a grantor trust is taxable to the U.S. grantor at full U.S. rates.