FBAR and Streamlined Catch-Up When Inheriting UK Wealth

When a US person inherits UK assets, the money itself is rarely taxed by the IRS, but the accounts holding it trigger a stack of US reports. Getting FBAR streamlined means inheriting UK wealth compliance right: filing FinCEN 114, Form 3520, and often Form 8938, then using the Streamlined Foreign Offshore Procedures if you are already behind.

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

A phone call from a UK solicitor changes more than your bank balance. If you hold a US passport or green card, or are a US tax resident, an inheritance from a British parent, aunt, or grandparent quietly hands you a portfolio of foreign accounts the day probate is completed. Those accounts sit inside the US reporting system, whether you knew it or not. Below,w we walk through exactly what has to be filed, in what order, and how to fix the position cleanly if returns and disclosures were missed.

Why does inheriting UK wealth create a US filing problem?

The inheritance is a capital receipt, so the United States does not tax the transfer as income. What it does tax is everything that happens next, and it insists on knowing about the accounts from day one. The instant a UK current account, a Cash or Stocks and Shares ISA, a share of your late father's house, or a slice of an unadministered estate passes to you, you become the owner of "foreign financial accounts" for US purposes.

That single change pulls in several regimes at once. You may need to report the receipt on Form 3520, disclose the accounts on an FBAR and on Form 8938, treat inherited UK funds as passive foreign investment companies, and pick up all future income on your Form 1040. When any of those were skipped in earlier years, the FBAR streamlined inheriting UK wealth pathway is usually how the backlog gets corrected without opening yourself to aggressive penalties.

The receipt itself: Form 3520

Reporting starts with the gift or bequest. A US person who receives more than USD 100,000 in a calendar year from a nonresident alien individual or a foreign estate must file Form 3520 with their tax return. It is an informational return only; there is no tax attached to it, but the threshold aggregates all gifts and distributions from that source for the year. Where the total exceeds USD 100,000, you must separately identify each gift above USD 5,000, converting sterling to dollars at the rate on the date of death or the date you received the asset.

The penalties for a missing Form 3520 have historically been brutal, running up to 25% of the unreported amount. There is genuinely good news here: in October 2024, the IRS stopped automatically assessing penalties on late-filed Forms 3520 that report foreign gifts and bequests, and now reviews any reasonable-cause statement before charging anything. That reform matters because historical abatement rates showed the automatic penalties were wrong far more often than not. Our deeper walkthrough of Form 3520 for foreign gifts and inheritances sets out the mechanics in full.

Which US reports are triggered by inherited accounts?

Once the assets are in your name, two annual disclosure regimes usually switch on together, and people frequently confuse them because they overlap. Sorting them out is the everyday work of any streamlined FBAR-inherited UK wealth review, because the two forms carry different thresholds, deadlines, and penalties.

Report

Filed with

Threshold (single filer, US-resident)

What it covers

FBAR (FinCEN Form 114)

FinCEN, via the BSA E-Filing system

Over USD 10,000 aggregate across all foreign accounts at any point in the year

Bank accounts, ISAs, building society accounts, and brokerage accounts

Form 8938 (FATCA)

The IRS, attached to Form 1040

USD 50,000 at year-end / USD 75,000 at any point (higher abroad)

Foreign financial assets, including some that the FBAR misses

The FBAR is not a tax return; it is a Treasury disclosure filed electronically, and the USD 10,000 test is an aggregate across every account, not a per-account figure. An inherited UK estate can push you over that line effortlessly. Alongside it, Form 8938 reports broadly the same assets to the IRS at higher thresholds, so a well-funded inheritance commonly needs both. Because the two regimes carry very different penalty structures, our note on FBAR penalties is worth reading before you decide how to proceed.

The hidden trap: inherited ISAs and funds are PFICs

Here is where UK wealth catches Americans out most sharply. A UK ISA is not tax-free to the IRS, and most inherited UK-based investment funds, unit trusts and OEICs are passive foreign investment companies. Each PFIC generally demands its own Form 8621, and the default US tax treatment of PFIC income is punitive, with an interest charge layered on top of ordinary rates. A Stocks and Shares ISA that felt like a gift from a tax-savvy relative can become one of the more expensive things you own once it crosses the Atlantic. We unpack the elections and the arithmetic in our guide to the PFIC and Form 8621 rules.

What about UK inheritance tax and double taxation?

UK Inheritance Tax is charged on the estate, not on you as a beneficiary. The estate's executors settle any IHT due, generally at 40% on the value above the £325,000 nil-rate band, before assets are distributed — the current bands and reliefs are set out on GOV.UK. Because the United States also levies its own estate tax, the two countries could, in theory, tax the same death twice. They do not, because the US-UK estate and gift tax treaty allocates taxing rights and grants credits to stop that overlap. In most inheritances of purely UK assets by a US-resident beneficiary, the estate tax exposure is a UK matter, not a US bill; our explainer on the US-UK estate tax treaty shows how the credits interlock.

One quiet advantage accompanies the inheritance: a US-basis step-up. For US capital gains purposes, your cost basis in the inherited assets generally resets to their date-of-death market value. Sell the inherited London flat shortly afterward, and your US taxable gain is measured only from that stepped-up figure, not from what your grandmother paid in 1975. Future rental income, dividends, interest, and gains, however, are all US-taxable to you from the date you inherit, which is why the reporting has to be set up correctly straight away.

How do you catch up if returns and FBARs were missed?

Plenty of people only discover these obligations a year or two after probate, once an account statement or a US accountant raises the alarm. The IRS runs formal routes back into compliance, and the right one turns on whether unreported income was involved.

Where foreign income went unreported, and the failure was genuinely non-wilful, the Streamlined Filing Compliance Procedures are the workhorse. For Americans living in the UK, the Streamlined Foreign Offshore Procedures (SFOP) carry a 0% miscellaneous offshore penalty. You file the most recent three years of amended or delinquent tax returns, six years of FBARs through the BSA system, and a signed Form 14653 certifying both non-wilful conduct and that you meet the non-residency test — broadly, a qualifying year with no US abode and at least 330 days outside the United States. This is the core of the FBAR-streamlined UK wealth inheritance solution for expatriate heirs, and it is why the SFOP sits at the center of most catch-up plans we build.

If the only failure was missing FBARs and every dollar of income was already reported and taxed, you do not need the full streamlined package at all. The Delinquent FBAR Submission Procedures let you e-file the late FBARs with a short reasonable-cause statement, typically without penalty. Choosing between these routes is the single most important decision in any FBAR-streamlined inheritance-UK-wealth project, because picking the wrong lane can in eithereither overpaying penalties you never owed or understating a genuine income problem. Our detailed breakdown of the Streamlined Foreign Offshore Procedures maps the eligibility gates step by step.

Case study: Priya inherits from her father in Leeds

Priya, a US citizen who has lived in Manchester for eleven years, inherited £480,000 from her father in 2024: a £310,000 house, a £90,000 Stocks and Shares ISA and £80,000 across two building society accounts. She had never filed a US return abroad because her UK salary sat under the foreign earned income exclusion and, she assumed, nothing was owed. The inheritance changed the picture entirely.

The receipt exceeded USD 100,000, so a Form 3520 was required for 2024. The ISA and building society balances pushed her far past the USD 10,000 FBAR aggregate and the Form 8938 thresholds. The ISA was a cluster of PFIC funds needing Form 8621. Because she had unreported dividend and interest income once the accounts were hers, the Delinquent FBAR route did not fit — she needed the full FBAR streamlined inheritance UK wealth package. We filed three streamlined tax returns, six FBARs, a Form 14653 explaining her good-faith misunderstanding, and the 2024 Form 3520. Result: no miscellaneous penalty, no Form 3520 penalty after the reasonable-cause review, and a clean basis step-up that limited her US gain when she later sold the house.

What should you do first as a US heir?

The order of operations matters. Establish date-of-death values in sterling and in dollars, list every inherited account, and identify which assets are PFICs before you file anything, because those figures feed every subsequent form. Then decide, deliberately, whether you are simply reporting a current-year inheritance or cleaning up several past years. A first-pass mistake on the FBAR streamlined inheriting UK wealth question — treating a genuine income-omission case as a mere late-FBAR fix — is the error we most often unwind for new clients, and it is entirely avoidable with the right sequencing.

Talk to TaxYork before you file.

Inheriting UK wealth as a US person is a solvable problem, but the forms interlock, and the penalties reward getting the sequence right the first time. If you have recently inherited or you suspect you are already behind, speak to our US-UK team before anything is submitted. Email hello@taxyork.com, call 020 3488 8606, or visit taxyork.com to arrange a confidential review of your position.