Introduction A high-net-worth American relocating to the United Kingdom faces a specific problem that most relocation advisers do not address. The private bank that manages their investment portfolio will ask — at some point — whether their US tax affairs are in order. The UK wealth manager who onboards them will want assurance that the […]
A high-net-worth American relocating to the United Kingdom faces a specific problem that most relocation advisers do not address.
The private bank that manages their investment portfolio will ask — at some point — whether their US tax affairs are in order. The UK wealth manager who onboards them will want assurance that the account is FATCA-compliant. The estate planning lawyer drafting a UK will needs to understand the client’s US domicile status. And the family office that coordinates their affairs will need to know whether the Streamlined catch-up has been completed before it can advise on the combined UK and US estate.
Unresolved US tax compliance — for an American who has been living in the UK without filing — is not just a tax problem. It is a wealth protection problem. And IRS Streamlined Filing Experts are the specialists who resolve it.
This guide explains why the compliance catch-up is the foundation of HNW wealth protection during US-UK relocation — and what a specialist engagement looks like in practice. Contact Jungle Tax at https://www.jungletax.co.uk/ for specialist guidance.
IRS Streamlined Filing Experts are specialist tax practitioners who prepare and submit voluntary compliance packages under the IRS Streamlined Filing Compliance Procedures.
In the wealth protection context, their role extends beyond compliance catch-up. They assess the full financial picture — investment portfolio, pension accounts, business interests, trust structures — and ensure that the catch-up submission accurately reflects every reportable item. They advise on how the compliance position interacts with banking, wealth management, and estate planning. And they establish an ongoing annual compliance program that enables the client to engage with UK wealth professionals with confidence.
A Streamlined submission prepared without this wealth management context is a compliance exercise. A Streamlined submission prepared with it is a wealth protection exercise.
The IRS Streamlined Filing Compliance Procedures are published at:
https://www.irs.gov/individuals/international-taxpayers/streamlined-filing-compliance-procedures
Unresolved US tax compliance creates specific risks for HNW Americans in the UK.
Banking risk. FATCA requires UK private banks and wealth managers to report account information for US persons to HMRC. Some institutions — particularly those with significant US regulatory exposure — have become reluctant to maintain accounts for US persons who cannot demonstrate current compliance. An unresolved compliance position creates a risk to account access that most HNW clients have not anticipated.
Investment management risk. A UK wealth manager who is engaged to manage a significant portfolio needs to understand the PFIC position of every fund in the portfolio, the FBAR reporting requirements for every account, and the Form 8938 thresholds. Providing this advice on a portfolio that has never been assessed for US purposes requires a Streamlined specialist first to establish the compliance baseline.
Estate planning risk. A UK estate plan that does not take the US tax position into account — including the US estate tax on worldwide assets — is not complete. The Streamlined catch-up establishes the compliance baseline that the estate planning lawyer needs.
This guide is written for HNW Americans who have relocated to the UK — or are planning to — and have not been filing US returns during their UK residence.
It is equally relevant to family offices, private banks, and wealth managers who advise US-person clients and need to understand the compliance baseline before wealth planning can proceed.
FATCA has been fully operational for over a decade. UK financial institutions now have mature FATCA compliance frameworks. Many are conducting periodic reviews of their US-person account holders to confirm that compliance representations remain current.
An HNW American who has been in the UK for several years — and who cannot confirm current US tax compliance — may find their account placed under review. Resolving the compliance position through the Streamlined program before this review happens is significantly less disruptive than responding to it under pressure.
From April 2025, the UK Foreign Income and Gains regime provides a four-year exemption from UK tax on foreign income for new UK arrivals.
For an HNW American who arrived in 2022 or 2023 and has not been filing US returns, the FIG window is running — and they may not even know it. IRS Streamlined Filing Experts who understand the FIG regime can structure the Streamlined catch-up to reflect the correct UK tax treatment in each year and advise on the post-FIG planning while there is still time to act.
Our related guide on US and UK tax advisors for the non-dom to FIG regime transition explains the FIG regime in full.
A US citizen who dies a UK resident with a worldwide estate exceeding the federal estate tax exemption is subject to US estate tax on the entire worldwide estate.
For an HNW American in the UK with UK property, UK pension funds, and a UK investment portfolio — none of which qualify for the UK spousal exemption if the surviving spouse is not a US person — the estate planning implications are severe.
None of this planning can proceed sensibly without a clean US compliance position. The estate planning lawyer needs to know the US filing history and the current compliance status before advising on the combined UK and US estate plan.
Before any Streamlined submission is prepared, a specialist IRS Streamlined Filing Experts engagement begins with a full compliance audit.
The audit covers: every year of non-compliance and every income category in each year; every foreign financial account — current accounts, savings accounts, ISAs, SIPPs, investment accounts, offshore bonds — for the FBAR analysis; every trust interest, business ownership, and investment fund holding for information return assessment; and the UK domicile and residency position for each year.
The audit identifies not just what has been missed, but also what the Streamlined submission must include to be complete and accurate.
For an HNW client, a wealth-aware Streamlined submission goes beyond the standard three-year returns and six-year FBARs.
It includes Form 8621 for every PFIC holding, including UCITS funds held in the ISA and SIPP. It includes Form 5471 for any interests in controlled foreign corporations. It includes Form 8938 for FATCA reporting. It includes the Article 17 treaty election for the SIPP.
It applies every available relief — the Foreign Earned Income Exclusion, the foreign tax credit across all applicable baskets, the passive income carryforward — to minimize the net US tax owed on the catch-up returns.
And it is accompanied by a non-wilfulness narrative that reflects the HNW context — the advisory team, the professional reliance, and the specific circumstances that explain the misunderstanding of the US filing obligation.
Once the Streamlined catch-up is complete, the client can engage with UK wealth professionals with confidence.
The private bank can be provided with confirmation of current US compliance. The wealth manager can be briefed on the PFIC position of every fund in the portfolio and the FBAR reporting requirements for every account. The estate planning lawyer can proceed with the combined UK and US estate plan knowing that the US filing history is clean.
And the annual compliance program — filing both the UK self-assessment and the US federal return, FBAR, Form 8938, and all applicable information returns — is established as a routine part of the client’s financial calendar.
The following steps describe a typical HNW relocation engagement from initial instruction to ongoing compliance.
Step one — Initial assessment and scope definition.
The adviser conducts a full review of the client’s financial position — income sources, investment portfolios, pension accounts, trust interests, business interests — and defines the scope of the Streamlined submission. Every reportable item is identified at this stage.
Step two — Year-by-year income and account inventory.
For each of the three return years and six FBAR years, the adviser reconstructs the income and account position. Bank statements, investment reports, payslips, pension statements, and trust documents are reviewed.
Step three — PFIC assessment and election strategy.
Every non-US fund holding is assessed for PFIC status. The election strategy — mark-to-market, QEF, or excess distribution — is determined for each PFIC position. Form 8621 preparation is scoped.
Step four — Return preparation and review.
Three years of US federal returns are prepared — including all applicable information returns. The foreign tax credit is calculated by basket for each year. The returns are reviewed for internal consistency and for consistency with the non-wilfulness narrative.
Step five — FBAR and FATCA filing.
Six years of FBARs are prepared and filed electronically. Every qualifying foreign financial account — including investment wrappers — is included. Form 8938 is prepared for any year in which the FATCA threshold was exceeded.
Step six — Non-wilfulness narrative preparation.
The narrative is drafted to reflect the HNW context — the advisory team, the UK tax compliance history, and the specific circumstances of the non-compliance. It is reviewed for consistency with the returns and signed by the client under penalty of perjury.
Step seven — Wealth management co-ordination and ongoing compliance.
Following submission, the adviser coordinates with the client’s private bank, wealth manager, and estate planning lawyer. The annual compliance program is established. The HMRC guidance on FATCA reporting for UK financial institutions is published at:
https://www.gov.uk/government/publications/fatca-guidance-notes
The IRS guidance on US citizens abroad is published at:
https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad
James is a US citizen. He relocated to London ten years ago for a senior role at a global investment firm.
He had never filed a US return since relocating. His financial position on engagement with Jungle Tax was as follows: a UK property worth approximately £2.8 million; a Stocks and Shares ISA worth £320,000 holding four UCITS funds; a SIPP worth £480,000 holding three UCITS funds; a UK investment portfolio worth approximately £1.1 million managed by a London private bank; and a carried interest account from his employer’s fund structure.
James’s private bank had recently sent him a letter requesting updated documentation of his US tax compliance status as part of their periodic FATCA review process.
The Jungle Tax engagement covered the following.
First, a full compliance audit identified all seven UCITS funds — across the ISA and SIPP — as PFICs. Form 8621 had never been filed for any of them. The statute of limitations on all ten years of returns was open indefinitely.
Second, the SIPP had never had the Article 17 treaty election made. Growth inside the SIPP had been potentially taxable in the United States each year of accumulation.
Third, the carried interest account required assessment under the US carried interest rules, which treat carried interest as a partnership interest rather than employment income.
Fourth, none of the accounts — ISA, SIPP, investment portfolio, or bank accounts — had ever been included in an FBAR. The combined peak value of the accounts significantly exceeded the FBAR reporting threshold in every year.
A Streamlined submission was prepared covering three years of returns — including Form 8621 for seven PFIC positions, the Article 17 SIPP election, and an assessment of the carried interest position — and six years of FBARs.
The non-wilfulness narrative addressed James’s professional background in investment management — acknowledging his financial expertise while explaining specifically that his knowledge was of fund structure and portfolio management, not of US tax compliance obligations for US persons living abroad.
Following the submission, Jungle Tax provided James’s private bank with a compliance confirmation letter. The bank review was closed satisfactorily.
James’s estate planning lawyer was briefed on the US estate tax implications of his UK asset base — including the property, the pension, and the investment portfolio — and proceeded to draft a combined UK and US estate plan.
Contact our IRS Streamlined Filing Experts team at hello@jungletax.co.uk or 0333-8807974 if you are in a similar position.
The most common mistake HNW clients make is treating the Streamlined catch-up as a tax compliance exercise — separate from their wealth management and estate planning.
The catch-up submission affects every aspect of the UK wealth picture: banking access, portfolio management, estate planning, and trust structures. The specialist who prepares the submission must understand the wealth management context — not just the tax obligations.
A Streamlined submission that does not cover every investment structure is incomplete.
Many HNW clients hold interests in structures they do not consider ‘accounts’ — carried interest vehicles, co-investment funds, offshore trusts, and family limited partnerships. Every such structure must be assessed for reporting obligations before the submission is finalized. A specialist IRS Streamlined Filing Experts engagement begins with a full financial inventory — not a list of bank accounts.
Many clients come to Jungle Tax after their private bank has already written to them requesting compliance documentation.
This is manageable — but it is less comfortable than acting before the bank review. A Streamlined submission that is in progress at the time of the bank review provides less certainty than one that is already complete. Engaging IRS Streamlined Filing Experts before the review is initiated — rather than in response to it — is always the better approach.
The Streamlined catch-up resolves the historical non-compliance. It does not establish the ongoing compliance program.
Many clients who complete a Streamlined submission then fail to file the following year’s US return, returning to non-compliance within twelve months. The ongoing annual filing program must be established before the Streamlined submission is complete. The ICAEW guidance on international tax obligations is available at:
https://www.icaew.com/technical/tax/tax-faculty/international-tax
A UK will drafted without knowledge of the US estate tax position on the worldwide estate is not a complete document.
The US estate tax on worldwide assets — for a US citizen who dies a UK resident — applies regardless of where the assets are held. A combined UK and US estate plan must address both systems. The Streamlined catch-up specialist should brief the estate planning lawyer directly — not leave the client to relay the US tax information secondhand.
Jungle Tax is a specialist US-UK cross-border tax advisory firm. Our team includes IRS Enrolled Agents and UK-qualified tax practitioners who advise HNW Americans on the full spectrum of US and UK tax obligations — from the Streamlined compliance catch-up to the integrated wealth protection framework that follows it.
We prepare Streamlined submissions that are wealth-aware — covering every investment structure, every information return, and every planning opportunity — and we coordinate with the client’s private bank, wealth manager, and estate planning lawyer to ensure the compliance position is understood and confirmed by every member of the advisory team.
We establish the ongoing annual compliance program before the Streamlined submission is complete — so that historical non-compliance is resolved and future compliance is secured in a single engagement.
You can find further information on our page at https://www.jungletax.co.uk/, or read our related guide to IRS Streamlined Filing Experts for the US-UK business sale.
Unresolved US tax compliance is not just a tax problem for HNW Americans in the UK. It is a wealth protection problem — affecting banking access, portfolio management, and estate planning.
Specialist IRS Streamlined Filing Experts resolve the historical compliance gap and establish the compliance foundation that the rest of the wealth protection framework requires.
Three points from this guide matter most.
First, UK private banks are scrutinizing US person compliance more closely under FATCA. Resolving the compliance position before a bank review is initiated is significantly less disruptive than responding to one.
Second, a wealth-aware Streamlined submission covers every investment structure — PFIC positions, information returns, the Article 17 SIPP election — not just the three years of returns and six years of FBARs.
Third, the Streamlined catch-up is not the end of the engagement. The ongoing annual compliance program must be established before the submission is complete, so that the historical gap is closed and the future compliance is secured simultaneously.
Speak to a Jungle Tax adviser today — contact us at hello@jungletax.co.uk or visit https://www.jungletax.co.uk/ to learn more.
FATCA requires UK financial institutions to report account information for US persons to HMRC, which then assesses the data to the IRS. As part of their FATCA compliance framework, many UK private banks conduct periodic reviews of their US-person account holders to confirm that the account holder has representations of current US tax compliance. An account holder who cannot confirm a clean compliance position may find their account placed under review. Completing the Streamlined catch-up before this review happens — rather than in response to it — is always the better approach.
A UK wealth manager who manages a significant portfolio for a US person needs to understand the PFIC status of every fund in the portfolio, the FBAR reporting requirements for every account, and the Form 8938 FATCA thresholds. Providing this advice on a portfolio that has never been assessed for US purposes requires a Streamlined specialist first to establish the compliance baseline. Without the compliance baseline, the wealth manager cannot give fully informed advice — and the client cannot receive it.
A wealth-aware Streamlined submission covers more than the standard three years of returns and six years of FBARs. It includes Form 8621 for every PFIC holding — including UCITS funds in the ISA and SIPP — Form 8938 for FATCA reporting, Form 5471 for any controlled foreign corporation interests, and the Article 17 treaty election for the SIPP. It applies every available relief — the Foreign Earned Income Exclusion, the foreign tax credit across all applicable baskets, and the passive income carryforward — to minimize the net US tax on the catch-up returns. And it is accompanied by a non-wilfulness narrative that reflects the full HNW context.
Following a Streamlined submission, the specialist can provide compliance confirmation letters to financial institutions, brief the wealth manager on the PFIC and FBAR position of each account, and liaise with the estate planning lawyer on the US estate tax implications of the worldwide asset base. This coordination is one of the most important services a Streamlined specialist provides for HNW clients — and one of the most consistently missing from generalist advisory arrangements.
For an HNW submission involving multiple investment wrappers, PFIC positions, information returns, and a complex non-wilfulness narrative, the preparation timeline is typically twelve to sixteen weeks from initial instruction to filing. The majority of this time is spent gathering and reviewing the required financial records — bank statements, investment reports, pension statements, and trust documents for up to six years. A submission that is rushed to meet an external deadline — such as a bank review — is more likely to contain errors. Engaging IRS Streamlined Filing Experts as early as possible is always the right approach.
Following the Streamlined catch-up, the annual compliance program for an HNW UK-resident American typically covers: the US federal return (Form 1040) with all applicable schedules; the FBAR (FinCEN Form 114) for all foreign financial accounts; Form 8938 for FATCA reporting; Form 8621 for each PFIC position; the Article 17 treaty election for the SIPP; and any other information returns that apply to the client’s specific circumstances. Annual fees for this scope of work typically range from £3,000 to £8,000, depending on the complexity of the income and account structure. The ongoing program should be established before the Streamlined submission is finalized — not treated as a separate decision.
