Introduction: Why the Reverse Hybrid Problem Punishes Americans Hardest
A reverse hybrid is the reason a perfectly ordinary US LLC can hand a London-based member an effective tax rate above 75%. Notably, HMRC accepts that the figure is real. Furthermore, it has now consulted on fixing it, and the response may arrive alongside the Autumn Budget on 28 October 2026.
Every professional summary of that consultation has been written for a British investor. Consequently, none addresses the person with the worst exposure of all. That reader is the American citizen who lives in Britain, files in both countries and owns a slice of an LLC back home. This article is written for exactly that reader.
What a Reverse Hybrid Actually Is
An entity is a reverse hybrid when its own jurisdiction treats it as transparent while another jurisdiction treats it as opaque. A US LLC is the textbook case. America looks through it and taxes the members on profits as they arise. Britain does the opposite. By long-standing HMRC practice, it treats almost all of them as companies and taxes only distributions.
HMRC sets out the framework in its International Manual guidance on foreign entity classification. Importantly, transparent and opaque are descriptive labels rather than statutory terms. For that reason, the mismatch has proved remarkably durable.
How the 75% Rate Is Built
Specifically, the arithmetic is brutal because each country taxes a different thing. America charges federal income tax at up to 37% on your share of profits as they arise, plus any state tax. Subsequently, Britain charges income tax on the distribution at dividend rates reaching 39.35% for 2026/27, as GOV.UK confirms.
Neither charge relieves the other, because the two taxes fall on different income in different years. Accordingly, the consultation states plainly that a member "could end up suffering an effective tax rate in excess of 75%". Meanwhile, stakeholders reported real-world rates above 60%.
The Reader Every Other Article Leaves Out
British commentary assumes the member is taxed only by Britain and America's LLC rules. However, a US citizen in London is taxed by both countries at once. America taxes on citizenship and Britain taxes on residence, permanently. Therefore the reverse hybrid mismatch does not merely create a rate problem for them. It also breaks the foreign tax credit that is supposed to be their entire protection.
What HMRC Has Actually Proposed
Precision matters here, because several summaries in circulation imply the change has already happened. It has not.
The Consultation and Its Dates
HMRC opened a consultation on reform to the taxation of UK-resident members of LLCs and other reverse hybrids on 10 June 2026. It ran for seven weeks and closed on 31 July 2026. The consultation landing page carries the full document and its 24 questions.
Critically, the government has published no response, no draft legislation and no implementation date. Anyone telling you the 75% rate has ended is ahead of the facts.
Automatic Transparency, Not an Election
The preferred solution is elegantly simple. UK-resident individual members of an eligible reverse hybrid would treat their holding as transparent for income tax and capital gains tax. In effect, Britain would match the treatment in the entity's home country.
Notably, the government proposes that this applies automatically rather than by election. You would not choose it, and you could not decline it. Furthermore, the treatment would stop if the entity ever became opaque in its own jurisdiction.
The Eligibility Conditions
In practice, four conditions define the perimeter. The entity must be taxed transparently where it is established and opaque in the UK. Additionally, it must not be resident in the UK or in any other jurisdiction. Nor may it trade in Britain through a permanent establishment.
Encouragingly, there are no size limits and no minimum member counts. A two-member Delaware LLC qualifies on the same terms as a large investment vehicle.
Who Is Excluded
Importantly, corporate members are expressly outside the reform. It applies to individuals only. Consequently, an American who holds an LLC interest through a company gains nothing from the change. That alone makes the ownership chain worth checking now.
Why the Foreign Tax Credit Fails Today
Most readers assume the treaty solves double taxation. In this specific case, it does not, and understanding why explains everything else.
Different Income, Different Years
HMRC can treat a share of profits and a distribution as two different types of income. Relief requires the same income taxed by both countries. Therefore the US charge on profits arising and the UK charge on a later distribution simply never meet.
Moreover, the timing gap compounds it. Profits taxed in America in one year may be distributed, and taxed in Britain, several years later. Meanwhile, the credit rules on both sides expect the two charges to align.
Why a US Citizen Fares Worse Still
Critically, for an American the income is usually US-source, because the LLC carries on a US trade or business. Britain taxes it anyway, on residence. Ordinarily the United States gives no credit against US-source income, so the American faces UK tax with no domestic relief available.
Article 24(6) of the US-UK double taxation convention re-sources certain US-source income for a US citizen resident in Britain, which restores a credit. Nevertheless, that re-sourced credit sits in its own separate limitation category. It also needs its own Form 1116, and the treaty caps it. In short, it softens the blow rather than removing it.
Anson and the Risk of Relying On It
Notably, the Supreme Court held in Anson that one Delaware LLC member had a transparent interest and could claim relief. However, the government maintains its view that most US LLCs are opaque. It also acknowledges that taxpayers applying Anson to their own facts "risk entering into dispute with HMRC".
HMRC applies a risk-based approach to opening enquiries where members claim double taxation relief on that basis. Accordingly, an Anson position is a live filing risk rather than a settled answer. Notably, the proposed legislation would remove that uncertainty without overturning HMRC's general guidance.
The Fixes That Backfire
Faced with a 60% to 75% charge, clients reach for structural fixes to the reverse hybrid problem. Three of them regularly make matters worse.
Checking the Box
Electing corporate treatment on Form 8832 turns a US LLC into a domestic corporation for American purposes. You then pay corporate tax on the profits and personal tax on the dividend. Meanwhile, Britain still taxes that same dividend. In short, you have bought symmetry at the price of an extra layer of tax.
Worse, the election would take the entity outside the proposed reform entirely, because the entity would no longer be transparent at home. The IRS guidance on limited liability companies sets out the classification choices.
Moving the Business Into a UK Company
Similarly, incorporating in Britain does create a single opaque entity, which superficially solves the mismatch. Unfortunately, it creates a controlled foreign corporation for US purposes. You then file Form 5471 annually and face current inclusions on net CFC tested income. Critically, an individual shareholder suffers those at ordinary rates, without the deduction available to corporations.
Liquidating the LLC
Alternatively, collapsing the structure ends the problem prospectively. Nevertheless, liquidation is a disposal. Therefore it accelerates a US gain and potentially a UK one, and it does so before the reform that might have rescued the structure. Timing a liquidation into the current uncertainty is rarely the cheapest route.
The Reporting You Still Owe
Meanwhile, whatever the structure, the reporting continues. A foreign-owned US disregarded entity must file Form 5472, where the penalty starts at $25,000. Similarly, LLC bank accounts commonly trigger the FinCEN foreign bank account report. Our guide to the hybrid entity problem covers the mechanics as they stand today.
What Changes If the Reform Lands
Assume for a moment that the reverse hybrid proposal becomes law in the form consulted on. The change for an American in Britain is larger than for anyone else.
The Arithmetic After Reform
Crucially, under transparency both countries tax the same profits in the same year. Britain charges income tax at up to 45%, and it gives relief for the US tax already suffered. Consequently, the member pays the higher of the two rates rather than the sum of them.
The consultation gives the illustration directly. A member with a 37% US effective rate and a 45% UK rate pays 45% overall, not 75% or more.
Deemed Partnership Treatment
Additionally, the mechanics matter for compliance. Members would be deemed to carry on the entity's trade in partnership. Furthermore, they would be treated as owning fractional shares of its assets, mirroring the rule in section 59 of the Taxation of Chargeable Gains Act 1992 that makes partnerships transparent for capital gains. Gains would be computed under UK rules and HMRC's Capital Gains Manual guidance on partnerships and Statement of Practice D12.
That reclassification carries consequences. UK trading profits attract National Insurance, and the American side raises self-employment tax. Ordinarily, a certificate of coverage under the US-UK totalisation agreement removes the American charge.
Prospective Only
Importantly, the treatment would apply for tax years following the introduction of legislation. There is no retrospection. Therefore the years you have already filed remain governed by the current rules. So does the year you are filing now, along with whatever position you took on Anson.
The State Tax Layer the Consultation Only Mentions in Passing
The consultation refers to "potential state-level taxes" and moves on. However, for many American members that layer is what pushes the effective rate past 75%, and it behaves differently from everything above.
Why State Tax Lands Anyway
An LLC carrying on business in a US state generally creates a filing obligation for its members in that state, whatever their residence. Consequently, a London-based member can owe New York or California tax on an apportioned share of profits without ever setting foot in the office. Rates in the higher-charging states add materially to the 37% federal figure.
The Treaty Does Not Reach It
Here is the point that catches people. The US-UK double taxation convention covers federal income tax. It does not bind the individual states, and the higher-tax states do not follow the treaty voluntarily.
Therefore no treaty relief, no re-sourcing article and no residence tie-breaker helps you against a state charge. Britain may allow credit for state tax as unilateral relief in some circumstances. However, that requires the same income to be taxed, which brings you straight back to the transparency mismatch.
What Reform Would and Would Not Fix
Aligning the UK and US bases fixes the federal problem cleanly. Britain would then relieve the federal tax on the same profits in the same year. Additionally, a UK charge computed on profits rather than distributions gives state tax something to sit against.
Nevertheless, the reform is a UK measure and cannot touch state law. Accordingly, an American member in a high-tax state should model the state charge separately. Treat any headline comparison of 75% against 45% as the federal story only.
Case Study: A London Member of a Delaware LLC
Consider a client profile we see repeatedly. An American citizen, UK resident for six years, works from London and holds 40% of a Delaware consulting LLC. His share of profits for the year is $200,000, and he sits in the top bracket in both countries.
The Position Today
First, America taxes his $200,000 share as it arises. At 37%, that is $74,000, before any state charge. The LLC then distributes the gross profit share to fund his living costs.
Meanwhile, Britain treats the LLC as opaque, so the $200,000 distribution is a foreign dividend. At the 39.35% additional dividend rate, that is $78,700. His combined charge reaches $152,700, which is 76.4% of the profit.
The Softer Version
Had the LLC distributed only the post-tax profit of $126,000, the UK charge would have been $49,581. His total would then be $123,581, or 61.8%. Notably, that band explains the apparent contradiction in the evidence. Stakeholders reported rates above 60%, while the consultation cites figures above 75%. The difference is simply how much cash actually leaves the LLC.
After the Proposed Reform
Under transparency, Britain would tax the same $200,000 as his share of trading profits. At 45% that produces $90,000, and Britain would relieve the $74,000 of US tax. His UK top-up becomes $16,000 and his total charge is $90,000, or 45%.
In total, the saving against the worst case is $62,700 in a single year. Ultimately, that is why the classification question deserves attention before the response is published rather than after.
What to Do Before HMRC Publishes Its Response
You cannot accelerate the legislation. However, you can put yourself in the right position for either outcome.
Establish Your Classification Position in Writing
Above all, document how you have reported the LLC on both returns, for every open year. Specifically, record whether you claimed UK double taxation relief on an Anson basis and what evidence supports it. Clients who cannot answer that question are the ones who lose enquiries.
Model Both Outcomes Now
Similarly, run the numbers on the current opaque treatment and on the proposed transparent treatment. Furthermore, test the effect of distributing less cash this year. The UK charge currently follows distributions rather than profits. That single lever changes the effective rate materially while the old rules still apply.
Fix Missed Filings First
Notably, LLC income is exactly the sort of item that goes unreported for years on one side or the other. If your American returns are behind, resolve that before any structural change. The IRS Streamlined Filing Compliance Procedures remain available to non-wilful taxpayers. Moreover, coming forward voluntarily always costs less than being found.
Watch 28 October and Confirm Your Residence
Finally, the Autumn Budget on 28 October 2026 is the obvious moment for a consultation response. Meanwhile, confirm your position under the statutory residence test, because the reform only helps UK residents. Professional bodies track the progress closely. Useful sources include ICAEW, the Chartered Institute of Taxation and the AICPA. Finally, HMRC will publish the response itself.
How TaxYork Can Help
TaxYork prepares US and UK tax returns for high-net-worth individuals, founders and investment professionals who file on both sides of the Atlantic. Where a reverse hybrid sits in the structure, we model both classifications before anything is filed.
Our work begins with the two returns rather than the entity documents. First, we reconstruct how the LLC has been reported in each country. Next, we quantify the credit actually available through tax treaty optimisation. Finally, we prepare any treaty position on Form 8833 that the facts support.
Where filings are behind, we handle the catch-up in the correct order. That means IRS Streamlined Filing plus any outstanding FBAR and FATCA reporting. Subsequently, we bring the ongoing compliance back into line with our US tax return preparation service.
Conclusion
The reverse hybrid consultation closed on 31 July 2026, and the proposed cure is genuine. Automatic transparency for eligible entities would align the two tax bases and restore double taxation relief. Consequently, a rate that can exceed 75% would be capped at the higher of the two countries' rates.
Nevertheless, nothing has changed yet. No response, no legislation and no start date exist, and the treatment would apply prospectively when it does arrive. Therefore the years in front of you are still governed by the old mismatch. Meanwhile, the decisions that matter most concern documentation, distribution timing and your American filing history. Get those right, and either outcome works in your favour.
Contact Us
If you hold an interest in a US LLC or another reverse hybrid while living in Britain, book a consultation with our cross-border team. We will model both classifications, quantify your credit position and set out what to do before HMRC publishes its response. Email hello@taxyork.com or call 020 3488 8606 to speak with a specialist today. Our full range of US and UK tax services supports high-net-worth clients through decisions exactly like this one.
Disclaimer
This article provides general information about UK and US tax rules and does not constitute tax advice for any specific person or situation. The reform described remains a consultation proposal, and its final scope, design and timing may differ or may not proceed at all. Case study figures are illustrative and exclude US state taxes. The application of these rules depends entirely on individual circumstances, and you should obtain professional guidance before acting on anything described here. TaxYork accepts no liability for decisions taken solely on the basis of this content.