Inheriting UK Wealth With Unfiled US Returns? The Streamlined Path to Compliance

If you are a US person who inherited UK assets and never filed the required US returns, the streamlined route for inheriting UK wealth lets you correct three years of returns and six years of FBARs while certifying that your lapse was non-wilful. Foreign heirs living abroad often qualify for a zero-penalty result under the foreign offshore procedures.

By the TaxYork Cross-Border Tax Team — reviewed by a US-UK dual-qualified adviser (CPA / Enrolled Agent).

Does inheriting money from the UK trigger US tax?

Receiving a foreign inheritance is not US income to you as the recipient, so the bequest itself is not taxed on your return. What it triggers is a web of US reporting duties on both the receipts and the assets you now hold. A US person who receives a foreign bequest of more than $100,000 from a nonresident estate must file Form 3520, and the inherited accounts then trigger annual FBAR and FATCA filings.

The distinction matters because most people assume "no tax" means "no paperwork." It does not. The reporting obligation under Internal Revenue Code section 6039F exists precisely so the IRS can see large foreign transfers, and missing it carries its own penalties separate from any income tax. That gap between owing nothing and reporting everything is exactly why the streamlined inheritance UK wealth program exists for heirs who have fallen behind.

What UK inheritance tax means for you as a US heir

UK inheritance tax is charged on the deceased person's estate, not on you, the beneficiary. The estate pays 40% tax on the value above the £325,000 nil-rate band, and since 6 April 2025, liability is determined by a residence-based test rather than domicile. You can read the current rules on GOV.UK inheritance tax, but the practical point is that you receive your share net of any UK tax already settled by the executors.

So you do not personally pay UK inheritance tax, and you generally do not pay US estate tax either, because US estate tax also falls on the estate rather than the heir. Inherited assets usually receive a US basis step-up to their date-of-death value, which can sharply reduce future capital-gains tax when you eventually sell. Our note on estate tax and worldwide assets walks through how the two systems interact.

What is the Streamlined Filing Compliance Procedures program?

The Streamlined Filing Compliance Procedures are an IRS amnesty designed for taxpayers whose failure to file was non-wilful, meaning negligence or a good-faith misunderstanding rather than deliberate concealment. You submit three years of amended or delinquent income tax returns and six years of FBARs, plus a signed certification. The official terms sit on the IRS streamlined procedures page.

There are two tracks. The Streamlined Foreign Offshore Procedures (SFOP) charge a 0% miscellaneous penalty and use Form 14653; the Streamlined Domestic Offshore Procedures (SDOP) charge a 5% penalty on the highest year-end aggregate of unreported foreign financial assets across the six-year window and use Form 14654. Choosing the right track is the single biggest driver of costs, which is why the streamlined inheritance of UK wealth analysis always starts with your residency history.

Do you qualify for the streamlined Inheritance Tax UK wealth relief?

Eligibility for the zero-penalty foreign track turns on a non-residency test. You must have had no US abode and spent at least 330 full days outside the United States in one or more of the last three years. Meet that test, and you land in SFOP; fall short, and you use SDOP with its 5% charge. Either way, you must be able to certify that the earlier non-compliance was non-wilful.

A typical qualifying heir is a dual citizen who grew up in Britain, never realized US filing followed them abroad, and then inherited a parent's estate. If that describes you, our guide to inheriting UK wealth as a US person and the companion piece on a sudden foreign windfall explain the first practical steps before you file.

Feature

Foreign track (SFOP)

Domestic track (SDOP)

Miscellaneous penalty

0%

5% of the highest year-end asset value

Certification form

Form 14653

Form 14654

Non-residency test

Required (330+ days abroad)

Not met / US resident

Amended returns

3 years

3 years

FBARs

6 years

6 years

Wilfulness standard

Non-wilful only

Non-wilful only

Which US forms does inherited UK wealth actually require?

Once the estate distributes, your inherited assets generate recurring US filings that most heirs have never seen. The core three are Form 3520 for the inheritance itself, Form 8938 for specified financial assets in the FBAR, and the FBAR for accounts. Layer in PFIC reporting for UK funds, and you have the full picture that the streamlined UK wealth inheritance submission must capture.

Getting these right the first time avoids a second round of corrections. Each form has its own threshold, its own penalty regime, and its own deadline, so we map them before drafting anything.

FBAR and Form 8938 thresholds

You file an FBAR (FinCEN Form 114) when your foreign accounts exceed $10,000 in aggregate at any point in the year. The non-wilful penalty is capped at $16,536 per form as of 17 January 2025, and, following the Supreme Court's 2023 Bittner decision, that cap applies per form rather than per account. Our walkthrough of streamlined FBAR filing shows the mechanics.

Separately, Form 8938 under FATCA applies at higher thresholds. For taxpayers abroad, single filers report above $200,000 at year-end (or $300,000 at any point), and married-filing-jointly filers above $400,000 (or $600,000 at any point). Inherited portfolios frequently breach both, so both filings usually run together.

Form 3520 and the foreign trust trap

If your total foreign bequest exceeds $100,000, Form 3520 must be filed, and our dedicated Form 3520 guide covers the deadlines. The bigger trap appears when the UK estate does not distribute outright but flows through a trust. A foreign trust drags in Form 3520 and Form 3520-A, plus the throwback rules that tax accumulated income at unfavorable rates.

Many British estates hold assets in will trusts or interest-in-possession structures that count as foreign trusts for US purposes. Spotting that early changes the whole filing strategy, and it is a recurring theme in every streamlined UK wealth inheritance case we handle.

Why UK funds, OEICs, and ISAs are usually PFICs

Here is the detail that surprises inheritors most. UK unit trusts, OEICs and the funds inside an ISA are almost always Passive Foreign Investment Companies, so each holding needs a separate Form 8621. The default PFIC regime taxes distributions and gains at the highest rate with an interest charge, unless you make a timely election.

An ISA carries no UK tax, yet the US grants it no shelter at all, which catches many heirs off guard. Sorting the PFIC calculations is often the most time-consuming part of a streamlined package, and getting it wrong invites the exact penalties the amnesty is meant to remove.

What are the deadlines and penalties if you keep waiting?

The streamlined program is generous, but it is neither permanent nor automatic. The IRS has stated it may close or tighten procedures or data-matching with foreign counterparts, and that, at the same time, your non-compliance is genuinely non-wilful and undiscovered. Once the IRS contacts you, the door to amnesty closes.

Waiting also compounds the exposure on each form. A late Form 3520 can incur a penalty of 25% of the unreported foreign gift or bequest, an FBAR lapse risks the $16,536 non-willful cap per form, and unaddressed PFIC holdings accrue interest charges year after year. The table below shows why acting early almost always costs less than hoping the problem stays hidden.

Form

What it reports

Trigger threshold

Exposure if ignored

Form 3520

Foreign gift or inheritance received

Over $100,000 from a nonresident estate

Up to 25% of the amount

FBAR (FinCEN 114)

Foreign financial accounts

Over $10,000 aggregate

Up to $16,536 per form (non-wilful)

Form 8938

Specified foreign financial assets

$200k+ abroad, single

$10,000, rising with continued failure

Form 8621

PFIC (UK funds, OEICs, ISA holdings)

Per fund held

Punitive tax plus interest charge

Sequencing matters as much as speed. We assemble the six FBAR years and three tax years so the figures reconcile, then draft the certification last, once all numbers are settled. A rushed submission that contradicts itself is worse than no submission, because inconsistencies undercut the non-wilful position at the heart of the whole application.

There is also a currency dimension that trips up self-filers. Every UK figure — account balances, dividends, sale proceeds and the date-of-death valuations behind your step-up — must be translated into US dollars using the correct exchange rate for the relevant date. Small errors here ripple across FBAR totals, Form 8938 thresholds and PFIC calculations at once, so we standardize the rates before any form is drafted.

Case study: a $600,000 UK inheritance cleaned up penalty-free

Consider "James," a US citizen who has lived in Manchester since childhood and never filed a US return. When his mother died, he inherited a £480,000 estate — roughly $600,000 — made up of a paid-off flat, a stocks-and-shares ISA holding UK OEICs, and cash. He had no idea any US filing was due.

Because James had lived outside the US for years and easily met the 330-day test, he qualified for the foreign track. We filed three years of returns, six FBARs, a Form 3520 for the inheritance, a Form 8938, and a Form 8621 for each fund within the ISA, with a Form 14653 certifying non-wilful conduct. The step-up in basis meant almost no gain on the assets, and the SFOP penalty was — a textbook streamlining UK welcome: full compliance, no penalty, and peace of mind.

The lesson from James is that the numbers rarely drive the pain — the paperwork does. His actual US tax liability over the three years totaled a few hundred dollars. Yet, the value of the exercise was in removing five-- and six-figure penalty risk and giving him a clean record for any future move, mortgage, or citizenship decision. Heirs who face a similar mix of property, funds, and cash usually find the same pattern: modest tax, large reporting relief, and a filing history that finally matches reality.

Talk to TaxYork about your inherited UK estate.

If you have inherited UK property, investments, or cash and never filed the US returns that followed, we can tell you within one call whether the foreign or domestic track fits and what your likely penalty exposure is. TaxYork specializes in exactly these US-UK cross-border clean-ups, from Form 3520 through PFIC elections to the final certification.

Email hello@taxyork.com, call 020 3488 8606, or visit taxyork.com to book a confidential review of your inheritance and filing history.