IRC 684: Gain Recognition Rules for Foreign Trusts

Under IRC Section 684, a U.S. person who transfers appreciated property to a foreign trust or foreign estate is treated as having sold that property at fair market value immediately before the transfer, and must recognize the built-in gain on a current U.S. tax return. The rule applies even when no money changes hands and the transfer is structured as a gift, bequest, or contribution. Several exceptions can defer or eliminate the immediate tax, but most come with conditions that, if broken later, bring the deferred gain due.¹

When Section 684 Triggers a Deemed Sale

Three conditions must line up before the deemed sale rule applies. The transferor must be a U.S. person. The recipient must be a foreign trust or foreign estate. And the property must be appreciated, meaning fair market value exceeds the transferor’s adjusted basis.

“U.S. person” is defined broadly. It covers U.S. citizens, U.S. residents, domestic corporations, domestic partnerships, and estates that are not foreign estates. If any of these entities moves appreciated property to a qualifying foreign recipient, Section 684 is in play.

Whether a trust is foreign turns on a two-part test. A trust is domestic only if a U.S. court exercises primary supervision over its administration and one or more U.S. persons control all substantial decisions.² Fail either prong and the trust is foreign. That matters because an otherwise domestic trust can flip to foreign status overnight if a U.S. trustee is replaced or if decision-making authority shifts abroad.

The timing of recognition is deliberate. The gain is treated as recognized immediately before the transfer, which locks in U.S. tax while the asset is still inside U.S. jurisdiction. The deemed sale applies whether the transfer is a lifetime gift, a contribution, or a bequest to a foreign estate, and whether or not a real buyer exists.¹

How the Gain Is Calculated

The recognized gain equals fair market value on the transfer date minus the transferor’s adjusted basis. The arithmetic is the same as a real sale; what is missing is the buyer and the cash.¹

The character of the gain follows normal rules. Property held longer than a year produces long-term capital gain at preferential rates.³⁴⁵

After the deemed sale, the foreign trust takes a basis in the property equal to the fair market value used to measure the gain. That prevents the same appreciation from being taxed twice when the trust eventually sells.

Section 684 is a one-way rule. The transferor recognizes gains but can never recognize losses. Transferring ten assets where five have appreciated and five have declined produces tax on all five gains and no offsetting benefit for any of the five losses, even inside the same transaction.⁶

Transfers That Look Indirect Still Count

The regulations define “transfer” to include direct, indirect, and constructive transfers, and borrow the anti-abuse framework from the Section 679 regulations to catch workarounds.⁷ Routing an asset through a third party does not help. If a U.S. person moves property to an intermediary who then transfers it to a foreign trust as part of a plan to avoid Section 684, the IRS treats the U.S. person as having made the transfer directly. Even without proof of a plan, the U.S. person has to show that the intermediary acted independently, or the transaction is attributed back.

Look-through rules reach entity transfers too. If a domestic trust, partnership, or other entity is partly owned by a U.S. person and transfers appreciated property to a foreign trust, the U.S. owners are treated as transferors of their proportionate share. The gain lands on the ultimate U.S. owners, not just the entity.

Exceptions That Can Defer or Eliminate the Tax

Several carve-outs can switch off the deemed sale, but each is narrower than it looks.

Grantor Trust Status

The most important exception applies when any person is treated as the owner of the foreign trust under the grantor trust rules of Subpart E. If a U.S. grantor retains enough control that the trust’s income is already taxed to the grantor, Section 684 steps aside; the anti-avoidance purpose is already satisfied.¹

Section 679 makes this exception practical for most foreign trusts with U.S. ties. Under Section 679, a U.S. person who transfers property to a foreign trust that has at least one U.S. beneficiary is automatically treated as the owner of the trust’s assets for income tax purposes.⁸ Because the transferor is already the deemed owner, the initial contribution escapes gain recognition.⁹ This is a deferral, not a permanent exemption. If grantor trust status later ends, the gain comes due.

Transfers at Death With a Stepped-Up Basis

When a U.S. person dies and property passes to a foreign trust or foreign estate, the deemed sale does not apply if the recipient’s basis is determined under Section 1014, the standard stepped-up basis rule.⁹ Basis resets to fair market value on the date of death, so there is no built-in gain left to capture. The exception is tied specifically to that stepped-up basis mechanism. Lifetime transfers of appreciated property to a foreign estate still trigger Section 684.

Sales for Fair Market Value

If a U.S. person sells appreciated property to an unrelated foreign trust for its full fair market value, Section 684 does not apply. The sale is already a taxable event that captures the appreciation, so the anti-avoidance overlay is unnecessary. Sales to related foreign trusts can still draw scrutiny under other rules.⁹

Charities and Section 1032 Stock

Two narrower exceptions round out the list. Transfers to a foreign trust that qualifies as a Section 501(c)(3) organization are exempt, as are transfers of corporate stock where the domestic corporation does not recognize gain under Section 1032.⁹ Both apply to limited fact patterns.

One boundary worth stating. The reverse direction, a foreign trust that migrates and becomes domestic, is not covered by Section 684 at all. The statute is only concerned with assets leaving U.S. tax jurisdiction, not entering it.

Later Events That Trigger the Deferred Gain

Because most foreign trusts with U.S. transferors rely on the grantor trust exception, the moment that status ends is often the moment Section 684 bites. When a foreign trust stops being treated as owned by a U.S. person, the regulations treat the U.S. person as having transferred all of the trust’s assets to a foreign trust immediately before the status change. The deemed transfer triggers gain on the full appreciation in the trust’s assets at that point.⁷

Three events commonly cause this.

Death of the grantor. Grantor trust status generally terminates at death, and the gain is recognized on the grantor’s final income tax return. The Section 1014 death-transfer exception may provide relief if the property receives a stepped-up basis.
Loss of U.S. beneficiaries. Under Section 679, a trust is treated as owned by the U.S. transferor only while at least one U.S. beneficiary exists. If all U.S. beneficiaries are removed or lose their U.S. status, grantor trust treatment ends and the deemed sale takes effect on the first day of the following tax year.
Release of a retained power. If the grantor voluntarily gives up a power that produced grantor trust treatment, the trust flips to non-grantor status and the deemed transfer is triggered.

Section 684(c) covers a separate scenario: a domestic trust that becomes a foreign trust. This outbound migration is treated as a deemed transfer of all the trust’s assets to a foreign trust immediately before the change takes effect. Unless the grantor trust exception or another carve-out applies, the trust itself must recognize gain on the full appreciation as of the migration date.¹¹⁰

Migration can happen without anyone intending it. Replacing a U.S. trustee with a foreign one, or a U.S. trust protector relocating abroad, can cause the trust to fail the court-and-control test and become foreign on that date. The regulations include a cure period. If residency shifts because of an unplanned event like the death, incapacity, or resignation of someone who controlled substantial decisions, the trust has 12 months to fix the problem by replacing the person or changing their residence. A timely cure preserves the trust’s original residency and no deemed transfer occurs. If reasonable steps were taken but outside circumstances prevented a timely fix, an extension can be requested from the IRS, though approval is discretionary.²

Form 3520 Reporting and the Open Statute of Limitations

Every transfer of property to a foreign trust by a U.S. person must be reported on Form 3520, even if an exception eliminates the gain.¹¹ The form requires the trust’s identifying information, the transfer date, and the fair market value of the property. A transferor who recognized Section 684 gain must attach a statement showing the deemed-sale calculation. A U.S. person treated as owner of a foreign trust is also responsible for ensuring the trust files Form 3520-A annually.¹²

The penalties are steep. For transfers to foreign trusts, the penalty is the greater of $10,000 or 35% of the gross value of the property transferred. Once the IRS issues a notice about the missing form, additional $10,000 penalties accrue for every 30-day period the failure continues, capped at the total reportable amount.¹³ A reasonable cause exception exists, but the IRS will not accept the fact that a foreign jurisdiction penalizes disclosure as reasonable cause.

The reporting failure also keeps the assessment window open. Under Section 6501(c)(8), when a taxpayer fails to report information required under Section 6048, the three-year statute of limitations on assessment does not begin to run until three years after the required information is actually furnished. If Form 3520 is never filed, the IRS can assess tax on the related items indefinitely; the clock simply never starts. If the failure is due to reasonable cause rather than willful neglect, the open window applies only to items connected to the missing information, not the whole return.¹⁴ A transferor who intentionally skips the filing gets no such limitation.

1
Office of the Law Revision Counsel. 26 U.S. Code 684 – Recognition of Gain on Certain Transfers to Certain Foreign Trusts and Estates
2
eCFR. 26 CFR 301.7701-7 – Trusts, Domestic and Foreign
3
Internal Revenue Service. Topic No. 409 – Capital Gains and Losses
4
Office of the Law Revision Counsel. 26 U.S. Code 1245 – Gain From Dispositions of Certain Depreciable Property
5
Office of the Law Revision Counsel. 26 U.S. Code 1 – Tax Imposed
6
eCFR. 26 CFR 1.684-1 – Recognition of Gain on Transfers to Certain Foreign Trusts and Estates
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eCFR. 26 CFR 1.684-2 – Transfers
8
Office of the Law Revision Counsel. 26 U.S. Code 679 – Foreign Trusts Having One or More United States Beneficiaries
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GovInfo. 26 CFR 1.684-3 – Exceptions to General Rule of Gain Recognition
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eCFR. 26 CFR 1.684-4 – Outbound Migrations of Domestic Trusts
11
Internal Revenue Service. About Form 3520, Annual Return To Report Transactions With Foreign Trusts and Receipt of Certain Foreign Gifts
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Internal Revenue Service. Instructions for Form 3520
13
Internal Revenue Service. Failure to File Form 3520/3520-A Penalties
14
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection