Why the FIG Regime Backfires for US Citizens
The FIG regime looks like a gift to wealthy new arrivals, yet for American citizens it frequently does the opposite of what the marketing promises. Furthermore, the damage is invisible until the US return is prepared, by which point the election is usually irreversible. This guide explains the trap in full and shows when a US citizen should decline the very relief everyone else rushes to claim.
Britain replaced the remittance basis with the four-year foreign income and gains regime on 6 April 2025. Consequently, thousands of bankers, founders and investors relocating to London now face a choice their advisers rarely frame correctly. The headline is seductive: four years of zero UK tax on your foreign income and gains.
At TaxYork, we prepare both sides of these returns under one roof. Therefore, we see the collision that a UK-only or US-only firm misses entirely. The central problem is simple. Zero UK tax means zero UK tax to credit against your American liability.
What the FIG Regime Actually Offers
The FIG regime exempts qualifying foreign income and gains from UK tax for your first four years of UK residence. Specifically, it covers foreign dividends, foreign interest, overseas property profits, overseas trade profits and foreign capital gains. You elect for it, source by source, on your Self Assessment return.
Eligibility turns on one test. You must become UK resident after at least ten consecutive tax years of non-residence, as the GOV.UK guidance on the four-year foreign income and gains regime confirms. The exemption applies only to income and gains actually arising after 6 April 2025.
Why Americans Are Different
Most new residents answer to HMRC alone. An American answers to the IRS as well, on worldwide income, for life. Therefore, a purely British calculation tells only half the story.
By contrast, the United States taxes its citizens wherever they live. Consequently, exempting income from UK tax does nothing to exempt it from US tax. Indeed, the income remains fully taxable in America, and the relief cannot change that.
The Foreign Tax Credit Mechanics That Create the Trap
The foreign tax credit is the engine that normally prevents double taxation for Americans abroad. However, the regime disables that engine precisely when you need it. Understanding why requires a short tour of how the credit works.
No UK Tax Means No Credit
The IRS foreign tax credit lets you offset foreign income taxes paid against your US liability on the same income. Crucially, the credit requires foreign tax to have been paid. No payment, no credit.
Under the FIG regime, you pay no UK tax on the exempt income. Therefore, you generate no creditable foreign tax. The US then taxes that income in full, with nothing to offset it, and your combined bill equals the full US charge.
The Counter-Intuitive Comparison
Now consider the alternative. Suppose you decline the election and pay ordinary UK tax on the same foreign income. You would then hold a substantial creditable UK tax, which offsets your US liability under the treaty.
For income where the UK rate meets or exceeds the US rate, that credit wipes out the US charge entirely. Consequently, paying UK tax frequently produces a lower combined bill than paying zero UK tax. That is the paradox in this article's title: 0% UK tax can raise your US bill.
When the Numbers Actually Favour FIG
The FIG regime does help some Americans. Notably, it helps where the income attracts little or no US tax, such as certain qualified dividends taxed at lower US rates, or where careful treaty positioning applies. Additionally, it helps non-US spouses and family members who face no American exposure at all.
The relief also assists where US foreign tax credit limitations already strand your credits. In that narrow situation, UK tax would not have been fully creditable anyway. Therefore, the analysis is genuinely case-specific, and our cross-border tax planning service models both outcomes before you elect.
The Hidden Costs Beyond the Headline
The credit problem is only the beginning. Furthermore, claiming the relief triggers several additional costs that competing guides mention in passing, if at all. Each one compounds the damage for an American.
You Forfeit Your UK Personal Allowance
Electing into the FIG regime for a tax year costs you your UK personal allowance of £12,570 and your capital gains annual exempt amount of £3,000. In other words, your UK-source income and gains lose their tax-free bands entirely. The GOV.UK guidance on Income Tax rates and personal allowances sets out the current figures, and the GOV.UK guidance on Capital Gains Tax allowances confirms the reduced annual exempt amount.
For a high earner with UK employment income, that forfeited allowance carries a real cash cost. Moreover, you sacrifice it in every year you claim, regardless of whether the FIG election saved you anything on the US side.
PFIC Rules Still Bite Your Foreign Funds
American clients love to assume the regime shelters their offshore fund portfolio. Unfortunately, it shelters only the UK charge. The United States still taxes those funds under its punitive passive foreign investment company regime.
The IRS treats most non-US funds, including many UK-based collective investments, as PFICs. Consequently, the income can suffer US tax rates exceeding 50% with onerous reporting on Form 8621, as explained in the IRS instructions for Form 8621 on passive foreign investment companies. The exemption offers no relief whatsoever from this, and no UK tax arises to credit against it.
The Treaty Residence Complication
A subtle point defeats many advisers. During the four-year FIG exemption period, you generally cannot be treated as UK treaty-resident under the US-UK double taxation convention. That status affects how the treaty allocates taxing rights and whether re-sourcing relief is available.
As a result, losing treaty residence can change your US position unexpectedly. Therefore, the interaction demands modelling before arrival, not after. Our tax treaty optimisation service addresses exactly these allocation questions.
How to Decide Whether to Claim
Because the regime is elective and source-by-source, you retain real control. Consequently, the right strategy is rarely all-or-nothing. Instead, it involves testing each income stream against both tax systems.
Model Both Systems Before You Arrive
Fundamentally, the decisive work happens before you become UK resident. Specifically, you compare, for each foreign income source, the combined tax under a FIG election against the combined tax without one. Your residence status itself turns on the GOV.UK guidance on the Statutory Residence Test, which fixes the day your four-year clock begins.
Pre-arrival planning also lets you crystallise gains, restructure portfolios and reposition income before the UK clock starts. Where you retain US investments, the IRS foreign earned income exclusion guidance and the treaty together shape which reliefs remain worthwhile. Furthermore, it allows you to exit PFIC holdings cleanly while you remain outside the UK net.
Claim Selectively, Not Wholesale
You may claim the FIG regime on some sources and not others. Therefore, a US citizen might exempt low-US-tax income while deliberately paying UK tax on high-rate income to generate creditable foreign tax. This selective approach frequently beats a blanket election.
The mechanics run through your Self Assessment return, and the HMRC residence and FIG regime manual on making a claim sets out the procedure. Getting the source-by-source split right is where the value lies.
Coordinate the Two Filings
The UK election and the US return must be prepared together, not in sequence by separate firms. Otherwise, a UK adviser optimises the British bill while unknowingly inflating the American one. We prepare both, and our US tax return preparation for expats keeps the two aligned around a single dataset.
A Worked Case Study With Real Numbers
Abstract argument convinces nobody, so consider a representative case from our practice. The details are altered, yet the arithmetic reflects genuine outcomes we produce for high-net-worth Americans.
The Position
A US citizen and senior private-equity partner moved from New York to London in September 2025. She qualified for the FIG regime, having lived outside the UK for over a decade. Her foreign income comprised £400,000 of overseas fund distributions and £250,000 of foreign interest, taxed in the US at a combined effective rate near 37%.
Her London adviser recommended a full FIG election for all four years. On the UK side, that produced a headline of zero tax on the £650,000. Naturally, she found the number appealing.
The Election She Nearly Made
Under a full FIG election, the UK charged nothing on the foreign income. However, the US still taxed the £650,000 at roughly 37%, a liability of about £240,500. Because no UK tax was paid, she generated no foreign tax credit, so the £240,500 stood in full.
She also forfeited her £12,570 personal allowance against her UK partnership earnings, adding roughly £5,660 of UK tax. Her total across both countries therefore reached approximately £246,160.
The Strategy We Recommended Instead
We declined the FIG election on the interest and the fund income, paying UK tax at 45% and 39.35% respectively. That produced a UK charge of about £210,000. Critically, that UK tax became a creditable foreign tax on her US return.
Consequently, the credit eliminated almost all of the £240,500 US liability, leaving only residual US tax of around £30,500 on rate differences. Consequently, her combined bill fell to roughly £240,500 in total, and she retained her personal allowance. More importantly, we exited her two PFIC holdings before arrival, saving a further six-figure sum in punitive US tax over the four years.
The Lesson
The full FIG election looked free and cost her nothing extra only by coincidence in year one. Across four years, the selective strategy saved her over £180,000, driven mainly by the PFIC exits and preserved credits. That is the difference a combined US-UK analysis makes.
What This Means Amid the 2025 Reforms
The FIG regime sits within a wider overhaul that has unsettled every American in Britain. Furthermore, related changes interact with the election in ways that reward early, integrated planning.
The Remittance Basis Has Gone
The old remittance basis, itself a trap for Americans, disappeared on 6 April 2025. Existing residents transitioned under transitional rules, while new arrivals face only the FIG choice. HMRC explains the change in its guidance on paying UK tax on foreign income.
That closure removed one problem and created another. Now the decision is sharper and the four-year window shorter, so the cost of a wrong election lands faster.
The Temporary Repatriation Facility Interacts
Long-term residents may also use the Temporary Repatriation Facility to bring pre-2025 income onshore at reduced rates. Nevertheless, that facility and the FIG election serve different populations and different years. Coordinating them for a mixed US-UK household requires care.
Why Timing Now Dominates Everything
Because the regime runs from your first day of UK residence, the planning window is pre-arrival and non-renewable. Therefore, an American contemplating a move to Britain should model the position months ahead. The MoneyHelper guidance on tax when you move to the UK is a useful starting point, though it cannot substitute for cross-border modelling.
How TaxYork Can Help
We advise high-net-worth Americans, dual nationals and internationally mobile executives on the FIG regime and the wider non-dom reforms. Furthermore, we handle the UK election and the US return together, which removes the coordination gap that costs clients so dearly.
Integrated Pre-Arrival Modelling
Specifically, our team models each foreign income source under both tax systems before you become UK resident. Additionally, we identify PFIC holdings to exit, gains to crystallise and structures to unwind while you remain outside the UK net.
Ongoing Dual Compliance
Once you arrive, we prepare your Self Assessment return and your US federal filing in tandem. Moreover, we track the four-year window and revisit the election each year, since the optimal answer changes as your income mix evolves.
Conclusion
The FIG regime is genuinely valuable for the right person, yet for many US citizens it quietly increases the total tax bill. The reason is structural: zero UK tax generates no foreign tax credit, so the full US charge survives while your UK allowances vanish. Consequently, the seductive headline of a four-year tax holiday can prove expensive.
The remedy is not to reject the regime outright but to model it properly, source by source, across both jurisdictions before you arrive. Ultimately, an American who plans early keeps the benefits where they exist and sidesteps the trap where they do not. That analysis is the single highest-value exercise you can undertake before relocating to Britain.
Contact Us
To model your FIG regime position before you move, book a consultation with our cross-border team. We will test every income source against both tax systems and set out a clear, source-by-source election strategy.
Email hello@taxyork.com or telephone 020 3488 8606. Alternatively, you can contact us through the website for an initial review of your position.
Disclaimer
This article provides general information only and does not constitute tax advice. Tax legislation, rates and thresholds change frequently, and the application of the FIG regime depends entirely on your individual circumstances. Consequently, you should obtain professional advice before acting on anything contained here. TaxYork accepts no liability for action taken or omitted in reliance on this article.