Trust and Inheritance Planning for Dual-Citizen Entrepreneurs

Trust and Inheritance Planning for Dual-Citizen Entrepreneurs: The Complete US-UK Guide

Trust planning for dual-citizen entrepreneurs is a uniquely high-stakes discipline. Entrepreneurs holding both US and UK citizenship sit at the intersection of two aggressive tax regimes, each with worldwide reach, each with its own trust rules, and each with an inheritance tax system that can confiscate up to 40% of an estate if structures are absent or misaligned. Add the complexity of business assets—founder equity, carried interest, private company shares, intellectual property—and the result is an estate planning puzzle that ordinary high-net-worth advisors cannot solve.

This guide provides a complete framework for trust planning that dual-citizen entrepreneurs must adopt to protect business wealth, ensure seamless succession, and avoid the double-taxation traps that await the unprepared.

What Is Trust Planning for Dual-Citizen Entrepreneurs?

Trust planning for dual-citizen entrepreneurs refers to the strategic use of trusts and related legal structures to transfer business and personal assets across generations while minimizing exposure to both US estate tax and UK inheritance tax. For an entrepreneur holding a US passport and UK indefinite leave to remain (or UK citizenship), a trust that works perfectly under English law may trigger punitive US tax consequences under the Internal Revenue Code—and vice versa.

The goal is a coordinated structure: one that respects the UK’s “relevant property” trust regime without creating a “foreign grantor trust” in the eyes of the IRS, and that locks in the US estate tax exemption before the 2026 sunset while sheltering assets from UK inheritance tax’s 40% charge.

For official guidance on US trust classification, see the IRS Foreign Trust Reporting Requirements. For UK inheritance tax on trusts, consult the HMRC Inheritance Tax Manual.

Why Dual-Citizen Entrepreneurs Face Elevated Trust Planning Risk

The trust planning dual-citizen entrepreneurs need is not just a matter of tax efficiency—it is a matter of survival for the business after the founder’s death. Several intersecting factors create acute danger:

1. Worldwide Taxation by Both Nations

The United States taxes its citizens on worldwide assets, income, and gifts, irrespective of residence. The United Kingdom taxes individuals on worldwide assets if they are UK-domiciled or deemed domiciled. A dual-citizen entrepreneur who has lived in London for 20 years is simultaneously in the US estate tax net and the UK inheritance tax net. Without trust planning, dual-citizen entrepreneurs can have the same business shares taxed twice—once by the IRS at up to 40%, and once by HMRC at 40%—before a single heir receives a penny.

2. The US-UK Estate Tax Treaty: A Shield, Not a Fortress

The US-UK Estate and Gift Tax Treaty provides a pro-rata unified credit and a foreign tax credit mechanism to mitigate double taxation. But it does not eliminate all friction. Certain trust structures, especially foreign situs trusts, may lose treaty protection. And the treaty must be affirmatively claimed via IRS Form 706 or 706-NA. Many dual-citizen families learn this too late.

3. Foreign Trust Classification and the Throwback Tax

A trust is considered “foreign” under Internal Revenue Code Section 7701(a)(31) if it fails the control test or the court test. Most UK family trusts—governed by English law, with UK trustees—are foreign trusts to the IRS. For a dual-citizen entrepreneur who is a beneficiary or settlor of such a trust, the consequences include:

• Form 3520 and 3520-A filing obligations, with penalties starting at $10,000 per form per year.
• The “throwback tax” levies an interest charge for the deferral in addition to taxing accrued income at the beneficiary’s highest marginal rate.Before being considered domiciled, the settlor must create the trust. Contributions can include non-UK real estate, US-based company stock, and specific investment portfolios. 
• Potential grantor trust status, which attributes all trust income to the US settlor personally, even if no distributions are made.

4. Business Assets and Valuation Challenges

Founder shares in a private company are illiquid. Yet US estate tax and UK inheritance tax both become due within six months of death. Without a liquidity plan—typically life insurance held in an appropriate trust—the family may be forced to sell business interests under distress to pay the tax. Trust planning for dual-citizen entrepreneurs incorporates bridges that this gap.

Trust Structures That Work for Dual-Citizen Entrepreneurs

Effective trust planning for dual-citizen entrepreneurs deploys structures that satisfy both the IRS and HMRC. The following are the most commonly used, each with specific drafting requirements:

1. The US Domestic Grantor Trust for UK Business Assets

A US domestic trust—one that satisfies both the court test and the control test—can hold UK business shares while avoiding foreign trust classification. If structured as a grantor trust, the dual-citizen entrepreneur pays income tax on trust earnings, allowing the trust to grow tax-free for beneficiaries. For UK inheritance tax purposes, the trust must be drafted to avoid the “gift with reservation of benefit” rules. This means the settlor cannot retain any benefit from the trust property.

2. The Excluded Property Trust for Non-UK Domiciliaries

If the dual-citizen entrepreneur is not yet UK-domiciled or deemed domiciled, an excluded property trust can permanently shelter non-UK assets from UK inheritance tax. Before being considered domiciled, the settlor must create the trust. Contributions can include non-UK real estate, US-based company stock, and specific investment portfolios. For US tax purposes, the trust must be structured as a domestic trust or a foreign trust with proper reporting to avoid punitive outcomes.

3. The Qualified Domestic Trust (QDOT) for Non-Citizen Spouses

If the entrepreneur’s spouse is a UK citizen (and not a US citizen), a QDOT is essential. Without it, the unlimited marital deduction is denied, and US estate tax becomes due on the first death. A QDOT defers the estate tax until distributions are made or the surviving spouse dies, preserving liquidity for the business and family.

4. The Intentionally Defective Grantor Trust (IDGT) for Business Succession

An IDGT is a US domestic trust that is a grantor trust for income tax purposes (the settlor pays the tax) but a completed gift for estate tax purposes (the assets are removed from the settlor’s estate). A dual-citizen entrepreneur can sell closely held business shares to an IDGT in exchange for an installment note, freezing the value of the business in the estate and shifting future appreciation to heirs. UK capital gains tax implications must be addressed, as the sale may trigger a disposal for UK purposes.

5. The Section 678 Beneficiary Trust

Under Internal Revenue Code Section 678, a trust created by a non-US person for the benefit of a US beneficiary can be structured so that the beneficiary, not the settlor, is treated as the owner for US tax purposes. This allows a UK-domiciled parent to create a trust for a dual-citizen child without the child suffering the throwback tax on distributions. The child is taxed currently on trust income, but the trust corpus grows outside the child’s estate.

The 2026 Sunset: A Critical Deadline for Trust Planning Dual-Citizen Entrepreneurs

The US federal estate tax exemption currently stands at $13.61 million per individual (2024). On January 1, 2026, it sunsets to approximately $7 million (adjusted for inflation). For trust planning dual-citizen entrepreneurs, this is the most actionable deadline in tax planning. The IRS has confirmed that gifts made before the sunset will not be clawed back. An entrepreneur who transfers business shares to an irrevocable trust before 2026 locks in the higher exemption amount and shields future appreciation from estate tax.

Consider an entrepreneur whose private company is valued at £8 million today. Under current law, the entire value falls within the exemption. After 2025, that same £8 million could trigger US estate tax of approximately $400,000 (40% of the excess above the reduced $7 million exemption). By funding an IDGT now, the entrepreneur eliminates that liability.

Step-by-Step Action Plan for Trust Planning Dual-Citizen Entrepreneurs

Step 1: Citizenship and Domicile Audit
Confirm both citizenships, plus any additional residencies. Map the entrepreneur’s UK domicile status under the deemed-domicile rules (15 out of 20 tax years). This single determination shapes inheritance tax exposure and trust eligibility.

Step 2: Business Valuation
Obtain a qualified valuation of the business, including founder shares, carried interest, intellectual property, and any holding company interests. The valuation forms the basis for gifting, trust funding, and estate tax projections.

Step 3: Dual-Jurisdiction Tax Modeling
Calculate the US estate tax and UK inheritance tax liability under current structures. Compare scenarios: with and without a trust, before and after the 2026 sunset, with and without a QDOT. This modeling identifies the net benefit of each planning option.

Step 4: Trust Selection and Drafting
Select the appropriate trust structure(s) from the menu above. Engage US and UK counsel jointly to draft trust deeds that satisfy both jurisdictions’ requirements. Pay particular attention to:

• Court test and control test clauses for US domestic trust status
• Reservation of benefit exclusions for UK inheritance tax
• QDOT provisions if the spouse is a non-US citizen

Step 5: Funding the Trust
Transfer assets to the trust. For business shares, execute sale or gift documentation. File any required UK capital gains tax elections (such as holdover relief). For cash and securities, transfer accounts into the trust’s name. File IRS Form 709 (Gift Tax Return) to report gifts and allocate the lifetime exemption.

Step 6: Liquidity Planning
Assess the projected death-tax liability (both US and UK). Fund a life insurance policy held inside an appropriate trust (irrevocable life insurance trust in the US, or a relevant property trust in the UK) to provide tax-free cash to the estate. This prevents forced liquidation of business interests.

Step 7: Wills and Cross-Border Coordination
Draft separate wills for UK-situs and US-situs assets. Include mutual recognition clauses. Coordinate executor and trustee appointments to ensure seamless administration.

Step 8: Annual Compliance and Review
Trusts trigger ongoing IRS forms—Form 3520, 3520-A, 8938, and FBARs for foreign accounts held by the trust. Implement a compliance calendar. Review the structure bi-annually to adapt to tax law changes and business valuation shifts. At Jungle Tax, we provide continuous monitoring for trust planning dual-citizen entrepreneurs to ensure ongoing compliance and optimal structure.

Common Mistakes in Trust Planning for Dual-Citizen Entrepreneurs

• Using a UK discretionary trust without IRS analysis: The trust will almost certainly be a foreign non-grantor trust, triggering Form 3520 and throwback tax exposure.
• Delaying planning until after the 2026 sunset: The higher exemption will be lost. Gifting later wastes a multi-million-dollar tax-saving opportunity.
• Ignoring the non-citizen spouse issue: Failing to establish a QDOT can cause immediate estate tax on the first death, potentially wrecking the business.
• Assuming UK trusts are invisible to the IRS: FATCA, CRS, and the US-UK information-sharing agreements mean full transparency. All trusts reportable to HMRC are effectively reportable to the IRS.
• Valuing the business low to reduce tax: The IRS and HMRC aggressively audit closely held business valuations. An inadequate valuation invites penalties and trust invalidity.

Final Thoughts: Trust Planning Is Business Continuity Planning

For trust planning dual-citizen entrepreneurs, the stakes are not just personal—they are enterprise-wide. An illiquidity crisis at death can shatter a business built over a lifetime, a double-taxation event, or a trust structure that the IRS classifies as foreign and punishes retroactively. The founders who protect their legacy are those who act while the business is healthy, the exemptions are high, and all planning tools remain available.

Do not allow dual citizenship to become a dual liability. Coordinate the jurisdictions. Fund the trusts. Secure the QDOT. And lock in the exemption before the 2026 sunset closes the window.

At Jungle Tax, we guide dual-citizen entrepreneurs through every stage of trust and inheritance planning. Reach out to our team for a confidential consultation and begin building the structure that will carry your business legacy into the next generation.