US Foreign Trust Taxation & Reporting v0.1

What this file is

This is a topic content skill. It loads on top of cross-border-tax-workflow-base and assumes the cross-border-tax-router has already run and sequenced the engagement. It carries the US foreign-trust rules only; the workflow architecture, intake map, sequenced-plan contract, and mandatory human hand-off live in the base.

Characterize the trust FIRST. Before any distribution is taxed, any gain on a sale is computed, or any form is selected, this skill determines (1) whether the trust is foreign, and (2) whether it is a grantor (owned) or non-grantor trust as to the US person. Every downstream number depends on that answer. A distribution from a grantor trust the US person already owns is not a taxable distribution at all; the same cash from a non-grantor trust can carry throwback tax plus an interest charge. Do not compute the consequence before you have fixed the character.

Currency. Provisions cited are current US federal law (IRC + Forms 3520 / 3520-A). Penalty amounts below are the long-standing statutory figures; confirm current indexing and any active penalty-relief procedure for the filing year.

This output is a working paper, never a filed return. Foreign-trust positions carry some of the highest penalty exposure in the Code (§6677, §6048). The foreign-country (e.g. Australian) treatment is out of scope and is deferred to a local accountant — see the flash points.

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Layer A — Reference layer

A1. Is the trust FOREIGN? (the two "courts" tests)

A trust is a US (domestic) trust only if it passes BOTH of the following. Fail either one and it is a foreign trust (IRC §7701(a)(30)(E), §7701(a)(31)(B)):

COURT TEST (§7701(a)(30)(E)(i))
  A court within the US is able to exercise primary supervision
  over the administration of the trust?
        NO  ──────────────────────────────► FOREIGN TRUST
        YES ▼
CONTROL TEST (§7701(a)(30)(E)(ii))
  One or more US persons have authority to control all
  substantial decisions of the trust?
        NO  ──────────────────────────────► FOREIGN TRUST
        YES ▼
                                  ───────────► DOMESTIC TRUST

• "All substantial decisions" is read strictly (distributions, who can benefit, investment, removal/replacement of trustee, termination, litigation). A single substantial decision controlled by a non-US person taints the control test.
• A foreign trustee, foreign situs, or foreign-law governing instrument typically fails the court test.
• Conservative default: if either test is not clearly met on the documents, treat the trust as FOREIGN and proceed under this skill.

A2. GRANTOR vs NON-GRANTOR (is a US person the OWNER?) — §671–679

If a US person is treated as the owner of all or part of the trust under the grantor-trust rules, that person is taxed currently on the trust's income (income, deductions, credits flow through — §671), regardless of whether anything is distributed. Run these in order:

§673–678 ordinary grantor-trust triggers
  Retained reversion, power to control beneficial enjoyment, certain
  administrative powers, revocability, retained income interest, or a
  power held by a person to vest corpus/income in himself?
        YES ─► US person is OWNER of that portion (GRANTOR TRUST)
        NO  ▼
§679  — the foreign-trust-specific owner rule  ◄── the decisive one offshore
  A US person (directly or indirectly) TRANSFERRED property to a
  FOREIGN trust that has (or may have) a US BENEFICIARY?
        YES ─► US transferor is treated as OWNER of the transferred
               portion → GRANTOR TRUST as to that US person
        NO  ▼
                          ───► NON-GRANTOR FOREIGN TRUST
                               (throwback regime applies to US-beneficiary
                                distributions — see A3)

§679 notes:

• The "US beneficiary" condition is read broadly: if any trust terms could permit a US person to benefit, or amounts could be accumulated for a future US beneficiary, the condition is generally treated as met.
• §679 can apply to transfers made before the transferor became a US person but within the look-back window tied to US residency (the 5-year pre-residency rule) — flag any transfer near an immigration date.
• A transfer for full fair-market-value consideration is generally outside §679; a gratuitous or below-value transfer is in.

A3. NON-GRANTOR foreign trust → US-beneficiary DISTRIBUTIONS: throwback (§665–668)

A US person who is a beneficiary (not owner) of a foreign non-grantor trust is taxed on distributions under the throwback / accumulation-distribution regime:

• DNI first. A current-year distribution carries out distributable net income (DNI) and is taxed to the beneficiary at ordinary rates (character preserved).
• UNI / accumulation distribution (§665). Income a foreign trust earned in a prior year but did not distribute becomes undistributed net income (UNI). A distribution exceeding current DNI is an accumulation distribution that pulls UNI out of prior years ("throwback").
• Throwback tax (§666–667). The thrown-back UNI is taxed as if received in the earlier years (averaging mechanics), and — critically — long-term capital gains accumulated in a foreign trust lose their preferential character and come out as ordinary income.
• §668 interest charge. A non-deductible interest charge is imposed on the deferred tax, compounding for every year the income sat undistributed. For a trust that accumulated for decades, the interest charge alone can approach or exceed the distribution — this is why long-accumulating foreign trusts are punitive to US beneficiaries.

Default method vs actual method:

• Actual (exact) method — requires the trust's complete year-by-year DNI/UNI records to allocate UNI to specific accumulation years; usually the lower number, but needs reliable historical accounting.
• Default method (Form 3520 instructions) — used when the year-by-year history is unavailable. It synthesizes an average accumulation period and applies the highest rate, generally producing a higher tax and interest charge.
• Conservative default: if the trust cannot produce reliable year-by-year UNI records, assume the default method applies and flag the UNI exposure as material and probably understated by any back-of-envelope estimate.

A4. Reporting forms

Form	Who / when	Covers
Form 3520 (§6048(a)/(c))	The US person	Transfers TO a foreign trust; distributions FROM a foreign trust; ownership of a foreign trust; AND large gifts/bequests from foreign persons/estates.
Form 3520-A (§6048(b))	The foreign trust (the US owner is responsible for ensuring it is filed; owner files a substitute if the trust will not)	Annual information return of a foreign trust with a US owner — income statement, balance sheet, and Foreign Grantor Trust Owner/Beneficiary statements to the US persons.

Penalties (§6677):

• Form 3520: greater of $10,000 or 35% of the gross value of the property transferred / distribution received (5% for failure to report ownership), per failure.
• Form 3520-A: greater of $10,000 or 5% of the gross value of the trust's assets treated as owned by the US person, per month of non-compliance.
• Large foreign gift/bequest under-reporting carries a separate 5%-per-month penalty (capped).
• Reasonable cause is a defense (§6677(d)); recent IRS practice has moved toward first-time-abatement-style relief and away from automatic systemic assessment on late-filed 3520/3520-A — confirm the current procedure and assert reasonable cause affirmatively where the facts support it.

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Layer B — Executable layer (trust facts → owner → treatment → forms)

Run top to bottom. Stop and flag at any unknown — do not assume favorably.

1. Gather trust facts. Instrument, governing law, situs, trustee nationality/residence, who controls each substantial decision, settlor, beneficiary class, funding history (who transferred what, when, for what consideration), and year-by-year income/distribution records if any.
2. FOREIGN test (A1). Apply court + control. If either fails → foreign. If either is unclear → treat as foreign.
3. OWNER test (A2). Apply §673–678, then §679. Decide grantor vs non-grantor as to each relevant US person. A trust can be a grantor trust as to one US person and not another.
4. Branch:
   • Grantor (US owner): trust income is reported on the owner's US return currently (Schedule B / relevant schedules). File Form 3520-A (or substitute) and Form 3520. Distributions to the owner are generally non-taxable returns of owned assets — characterize the trust before calling any cash a "distribution."
   • Non-grantor + US-beneficiary distribution: compute DNI; identify any accumulation distribution; run throwback (A3) under actual method if records allow, else default method; add the §668 interest charge. Report on Form 3520.
   • No US owner, no distribution this year: report transfers/ownership as applicable on Form 3520; UNI continues to accrue silently — note future exposure.
5. SALE overlay (see flash point). Determine the tax owner at the moment of sale from step 3, before computing gain. Grantor analysis first: if a US person owns the trust under §679, gain on the trust selling an asset is that US person's gain currently. If non-grantor, gain stays in the trust, swells DNI/UNI, and is taxed to a US beneficiary only on distribution (with throwback on any accumulated portion).
6. Residency overlay. If the US person's status is changing (expatriation, becoming/ceasing to be a US person), the router's sequencing rule governs order of operations and you must cross-reference us-expatriation-exit-tax — a §877A mark-to-market and the §679 ownership question can collide.
7. Assemble working paper + reviewer brief per the base contract.

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Audit flash points

⚑ AUDIT FLASH POINT — §679 deemed ownership. A US person who transferred property to a foreign trust that could benefit any US person is treated as the owner even with no distribution and no retained control. Check funding history and any transfer within the pre-residency window. Missing this turns a "non-grantor" analysis into a current-tax-and-3520-A filing obligation.

⚑ AUDIT FLASH POINT — throwback interest on long-accumulated UNI. For a foreign non-grantor trust that accumulated income for many years, the §668 interest charge compounds across every accumulation year and capital gains lose their character. The interest can rival the distribution itself. If year-by-year records are missing, assume the default method and treat the exposure as large and under-estimated.

⚑ AUDIT FLASH POINT — 3520 / 3520-A penalties and reasonable cause. Penalties run to 35% (3520) and 5%/month (3520-A) of trust value. File on time; if late, assert reasonable cause (§6677(d)) affirmatively and check the current IRS penalty-relief / first-time-abatement posture before assuming an automatic penalty.

⚑ AUDIT FLASH POINT — US vs foreign characterization mismatch. A trust the US treats as a foreign non-grantor trust may be treated entirely differently abroad. Australian discretionary and unit trusts are common and are typically foreign non-grantor trusts to the US unless §679 applies — but their Australian treatment (e.g. trust distributions, CGT, present entitlement) does not track the US analysis. The two systems can each tax the same economics differently and double-tax relief is not automatic. The Australian side requires a local accountant — do not opine on it.

⚑ AUDIT FLASH POINT — selling trust assets vs distributing then selling: order matters. Whether the trust sells the asset (gain lands in the trust → DNI/ UNI → throwback to a US beneficiary later) or distributes the asset first and the US person sells (gain on the beneficiary's own return, possibly with stepped basis questions) produces materially different US tax. Fix the tax owner at the instant of sale under the §679/grantor analysis before modelling the sale, and sequence per the router.

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Topic self-checks

• Court test AND control test both applied; foreign/domestic conclusion stated (defaulted to FOREIGN where unclear).
• §673–678 screened, then §679 screened against full funding history and any pre-residency transfers; grantor vs non-grantor fixed per US person.
• If grantor: owner's current income inclusion handled; 3520-A (or substitute) and 3520 identified.
• If non-grantor distribution: DNI vs accumulation distribution computed; throwback run; §668 interest charge included; actual vs default method chosen and justified.
• UNI / records availability assessed; default method assumed where history missing.
• Form 3520 transfer/distribution/gift items captured; penalties and reasonable-cause posture noted.
• Sale overlay: tax owner at moment of sale fixed before any gain computed.
• Residency overlay: us-expatriation-exit-tax cross-referenced and router sequencing applied where status is changing.
• Australian (or other foreign-country) treatment explicitly deferred to a local accountant.
• Output labelled a working paper; no human sign-off claimed.

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Disclaimer

Provides computational and interpretive guidance on US foreign-trust taxation and Forms 3520/3520-A only. Not tax or legal advice and not a filed return. Trust characterization and throwback turn on the trust instrument and history and require professional judgement; the foreign-country treatment requires a local accountant. Have outputs reviewed and signed by a qualified, licensed accountant before acting. Research-verified (tier 2) pending credentialed sign-off.