Pre-Immigration Tax Planning: Before You Move to the US

Taxpayers planning to relocate to the United States face a narrow but valuable window in which to structure their foreign assets before US income tax, estate tax, and gift tax rules apply to them in full force. Once an individual becomes a US person for tax purposes, worldwide income and, eventually, worldwide assets come within the reach of the US tax system but assets and structures put in place well in advance of that date can remain outside it.

Key Takeaways

• Pre-immigration planning should address US income tax, estate tax, and gift tax exposure together, not in isolation.
• A foreign irrevocable “drop-off trust,” funded before the move, can shield future income on transferred foreign assets from US income tax.
• The trust must generally be established and funded at least five years before the individual becomes a US person, or the income tax benefit is lost.
• An irrevocable transfer to a foreign trust can also remove those assets from the individual’s future US taxable estate, provided no “strings” are retained.
• An alternative structure allows the individual and family to be discretionary beneficiaries while still achieving estate tax exclusion, though continued income tax grantor status may apply.

Introduction

For individuals planning to relocate to the United States — whether for employment, business, or family reasons — the period before the move represents a uniquely valuable planning opportunity. Once US tax residency begins, the individual’s worldwide income becomes subject to US federal income tax, and on death, worldwide assets become subject to US estate tax. Many of the most effective planning tools available to reduce this future exposure can only be implemented before residency begins; once the move has occurred, several of the most powerful options close permanently. Pre-immigration planning is therefore not a matter to defer until after arrival — it must be addressed well in advance.

Income Tax Planning: The Foreign “Drop-Off” Trust

One of the principal pre-immigration income tax strategies involves establishing a foreign irrevocable trust before moving to the United States and irrevocably transferring foreign assets into that trust — an arrangement often referred to informally as a “drop-off trust.” By completing this transfer before becoming a US person, the individual can avoid US income tax on the future income generated by the transferred assets, since those assets and their income belong to the trust rather than to the individual directly.

The Critical Five-Year Rule

This strategy carries an important timing requirement: a non-resident should establish and fund the foreign trust at least five years before becoming a US person.[1] If the trust is set up and funded within five years of the individual becoming a US person, special anti-abuse rules treat the individual as the grantor of the trust for US income tax purposes, meaning the future income earned on the transferred assets becomes taxable to the individual after all — effectively negating the intended benefit. This five-year lead time makes early planning essential; taxpayers who wait until a move is imminent will generally find this particular strategy unavailable to them in its most effective form.

Estate and Gift Tax Planning

Beyond income tax, an irrevocable transfer of foreign assets to a foreign trust before immigration can also serve estate tax planning objectives. Once assets are irrevocably transferred out of the individual’s ownership, they are generally removed from that individual’s estate and are not subject to US estate tax on death — even after the individual has become a US citizen or resident.

Avoiding the “Strings” That Undo the Plan

As with any irrevocable trust planning, care must be taken that the settlor (transferor) does not retain any rights or powers — commonly referred to as “strings” — that could pull the transferred assets back into the settlor’s taxable estate. These include retained control over distributions, retained beneficial enjoyment of the trust property, retained substitution rights, or other retained powers over the trust. A trust that appears irrevocable on its face but leaves meaningful control in the settlor’s hands risks failing to achieve its intended estate tax benefit.

An Alternative Route: Discretionary Trust with Family as Beneficiaries

Pre-immigration planning is not limited to a strict drop-off structure in which the individual has no further connection to the transferred assets. An alternative approach allows a taxpayer, before migrating to the United States, to transfer foreign assets into a foreign irrevocable discretionary trust in which the individual and family members can become discretionary beneficiaries.

Under this structure, the taxpayer may still be treated as the grantor of the trust for US tax purposes, meaning the trust’s future income remains taxable to the individual going forward. Even so, if the trust is properly structured, the transferred assets can remain outside the individual’s taxable estate and will not be subject to US estate tax on death. This approach effectively trades away some of the income tax benefit of the strict drop-off trust in exchange for retaining the ability of the individual and their family to benefit from the trust’s assets during the individual’s lifetime — a trade-off that may be attractive depending on the individual’s priorities and the nature of the underlying assets.

Practical Implications for Prospective Immigrants

Taxpayers contemplating a move to the United States should treat pre-immigration planning as a coordinated exercise spanning income tax, estate tax, and gift tax simultaneously, rather than addressing each in isolation. Key action points include:

Beginning the planning process at least five years before an anticipated move, to preserve the full income tax benefit of a foreign drop-off trust.

Carefully drafting any trust instrument to avoid retained “strings” that would undermine the intended estate tax exclusion.

Deciding, based on individual circumstances and priorities, between a strict drop-off trust (maximum income and estate tax benefit, but no ongoing personal benefit from the assets) and a discretionary trust structure (continued family benefit, with estate tax exclusion but continued grantor income tax treatment).

Coordinating any pre-immigration entity restructuring — such as check-the-box elections for foreign companies — alongside trust planning, since both trust and entity planning windows generally close, or become far more costly, once US residency begins.

The overarching lesson is straightforward: plan early, and structure the arrangement correctly before moving to the United States. Because many of these strategies are time-sensitive and depend on facts that are difficult or impossible to unwind after the fact, always consult a cross-border tax advisor well before a planned relocation to ensure the chosen structure fits your specific circumstances.