Introduction: Why the Disguised Investment Management Fee Rules Now Cost More
The disguised investment management fee rules became substantially more expensive on 6 April 2026, and almost nobody has explained why. Furthermore, the reason lies not in those rules themselves but in what happened alongside them. Carried interest moved to a new regime, and the gap between the two treatments widened sharply.
That gap now measures roughly thirteen percentage points of your reward, and the disguised investment management fee rules sit on the expensive side of it. Moreover, it applies to sums you may already have received this tax year. At TaxYork, we prepare US and UK returns for American partners and portfolio managers across the London fund community, and this boundary decides more tax than any other single question they face.
What the Disguised Investment Management Fee Rules Actually Catch
The disguised investment management fee rules sit in Chapter 5E of Part 13 of the Income Tax Act 2007. Specifically, they charge income tax on any sum arising to an individual for providing investment management services, whatever label the documents attach. Consequently, form is irrelevant and substance decides everything.
HMRC introduced the regime to stop management fees being converted into capital receipts. Therefore, a payment described as a partnership allocation, a loan waiver, a share redemption or a special distribution still falls within charge. The published scope appears in HMRC's Investment Funds Manual at IFM36110.
The 12.9-Point Gap That Opened on 6 April 2026
Consider the arithmetic. A disguised investment management fee attracts income tax at forty-five per cent plus Class 4 National Insurance at two per cent, giving forty-seven per cent. Meanwhile, qualifying carried interest is now taxed on only 72.5 per cent of qualifying profits.
Apply that multiplier and the effective charge on qualifying carry becomes roughly 34.1 per cent. Accordingly, the difference between a fee characterisation and a carry characterisation is now about 12.9 percentage points. Previously the comparison ran against capital gains rates, and commentary written before 2026 still describes that older world.
How the Disguised Investment Management Fee Charge Works
Three conditions must hold before a sum falls within charge, and each deserves separate attention. Notably, the statutory framework in Chapter 5E applies to individuals only, which produces a counterintuitive result explored below. Furthermore, the charge bites whether or not your firm is authorised by the Financial Conduct Authority.
The Three Statutory Conditions
A sum is a management fee where it arises to an individual from an investment scheme, and where it is not a repayment of capital the individual invested. Additionally, it must not be an arm's length return on that capital, nor carried interest. Fail any exclusion and the charge applies.
HMRC summarises the mechanism at IFM36150. Importantly, the rules bite regardless of whether the payment passes through a partnership, a company or a third party. Indirect routes therefore achieve nothing.
Timing matters as much as characterisation. A disguised investment management fee is charged when the sum arises to you, not when you finally draw it. Consequently, an allocation credited to a partner account can trigger a British liability well before any cash reaches your bank. Plan the cash flow accordingly.
Why Structuring Through a Company Does Not Help
A company cannot itself suffer a disguised investment management fee charge, which sounds helpful until you examine the drafting. In practice, sums arising indirectly to an individual through any entity are still attributed to that individual. Consequently, interposing a management company merely adds a layer without changing the answer.
Many American principals arrive in London with a structure built for United States purposes. However, an arrangement that works cleanly for a Delaware manager can trigger the charge here. Review the flow of every payment before your first UK filing rather than afterwards.
The 47% Arithmetic
The headline rate follows from ordinary UK thresholds. Additional rate income tax applies above £125,140, where the personal allowance has already been withdrawn entirely, under the current income tax rates. Furthermore, Class 4 contributions add two per cent above the upper profits limit, as set out in the National Insurance rates guidance.
Deemed trading treatment produces that National Insurance exposure. Ultimately, a disguised investment management fee is not merely taxed as income; it is taxed as the profits of a deemed trade, which changes both the rate and the reporting.
The Three Exclusions Worth Protecting
Each exclusion from the disguised investment management fee rules is a genuine planning asset, and each fails easily through sloppy documentation. Therefore, treat them as compliance positions to be evidenced rather than assumptions to be asserted.
Repayment of Your Co-Investment Capital
Capital you invested alongside external investors comes back to you outside the charge. Nevertheless, the exclusion protects the return of capital only. HMRC expects the investment to sit on the same terms as investments made by genuine third-party investors in the same scheme.
The Arm's Length Return Test
Profit on your co-investment escapes the disguised investment management fee rules where it constitutes an arm's length return. Specifically, HMRC's guidance at IFM36420 requires investments of the same kind as those made by external investors, a return reasonably comparable to theirs, and comparable governing terms.
Preferential economics destroy this. For instance, a manager strip carrying enhanced rights, a waived fee or a discounted entry price will fail comparability. Accordingly, document the external investor benchmark at the time you invest, because reconstructing it years later rarely convinces.
Carried Interest and Where It Now Sits
Carried interest is excluded from the fee charge and taxed under its own regime. However, that regime changed fundamentally on 6 April 2026. From that date, all carried interest is treated as the profits of a deemed trade, subject to income tax and Class 4 contributions, per HMRC's revised carried interest regime.
The exclusion consequently no longer delivers capital treatment. Instead, it delivers the 72.5 per cent multiplier, which remains valuable but works differently. We examine the interaction with your American return in our companion guide on UK carried interest for private equity partners.
Income-Based Carried Interest and the 40-Month Test
Even genuine carried interest can be dragged back into the fee charge. Specifically, the income-based carried interest rules test how long the fund actually holds its investments. Short holding periods look like trading, so Parliament taxes them accordingly.
Under 36 Months: Full Income Treatment
Where the scheme's average holding period falls below thirty-six months, the whole reward is treated as income-based carried interest. Therefore, it is charged as a disguised investment management fee at the full forty-seven per cent. Credit and event-driven strategies are the obvious casualties.
The Taper Between 36 and 40 Months
A taper operates between thirty-six and forty months, so the income proportion falls gradually as the holding period lengthens. At forty months or more, the reward qualifies fully for carried interest treatment. HMRC explains the interaction at IFM37600, and the exclusions themselves appear at IFM37250.
What the 2026 Reform Changed
Before April 2026 the forty-month test decided between capital gains treatment and income. Now it decides between 34.1 per cent and forty-seven per cent, both charged as trading income. Consequently, the stakes fell in one sense and the complexity rose in another, because the disguised investment management fee rules now compete with a trading charge rather than a capital one.
One consequence deserves emphasis. Because both outcomes are now income, a US principal loses the argument that UK capital treatment aligns with American capital treatment. That alignment previously did useful work.
What This Means on Your US Return
American citizenship taxes you on worldwide income irrespective of where you live. Therefore, every sum caught by the disguised investment management fee rules also appears on a Form 1040. The question is never whether, but how much relief you recover.
Ordinary Income Both Sides, But Not the Same Amount
The United Kingdom and the United States rarely measure the same reward identically. Notably, the 72.5 per cent multiplier is a purely British concept with no American equivalent. Consequently, the IRS taxes the full amount while HMRC taxes a reduced slice, which distorts the credit calculation.
You claim relief on Form 1116. However, credits sit in separate baskets, and fee income, carry and personal investment returns frequently land in different ones. Our treaty and foreign tax credit planning service exists precisely for this reconciliation.
Timing compounds the mismatch. The British tax year ends on 5 April while the American year ends on 31 December, and payments on account can bunch two years of UK tax into a single US year. Therefore, a large disguised investment management fee in one year can leave you with credit you cannot use in the year the IRS wants it.
Section 1061 and the Character Mismatch
American law applies its own three-year holding period to carried interest under section 1061 of the Internal Revenue Code. Meanwhile, Britain applies a forty-month average holding period. Those two tests are not the same test, and they routinely disagree.
Picture the consequence. Your reward may be long-term capital gain in America and full income in Britain, or the reverse. Accordingly, the credit may sit in a basket where you have no matching income, stranding relief you genuinely paid for.
The 2% That Never Comes Back
Class 4 National Insurance is not a creditable income tax for American purposes. Therefore, the two per cent attaching to a disguised investment management fee produces no foreign tax credit whatsoever. It is simply a cost.
A totalisation agreement governs which country charges social security, and a certificate of coverage prevents duplicate contributions. Furthermore, the position appears in the IRS guidance on totalisation agreements. Nevertheless, relief from American self-employment tax does not convert British contributions into a credit.
Residence Reliefs That Rarely Rescue You
Newly arrived principals often expect the new resident reliefs to shelter this income. Unfortunately, they seldom do, because a disguised investment management fee rewards services performed here.
The Four-Year FIG Regime
The foreign income and gains regime replaced the remittance basis on 6 April 2025. Qualifying new residents receive relief on foreign income and gains for their first four years of UK residence, provided they were non-resident for at least ten consecutive tax years beforehand, as explained in the HMRC eligibility guidance.
The difficulty is straightforward. Fees for managing money from London are British in character. Consequently, the regime rarely reaches the sums that matter most to you.
Overseas Workday Relief and Its £300,000 Cap
Overseas workday relief now carries an annual financial limit. Specifically, relief is capped at the lower of thirty per cent of qualifying employment income or £300,000, under the published overseas workday relief rules. Additionally, the relief addresses employment income rather than deemed trading profits.
Leaving Britain Does Not Close the Charge
Departure offers less protection than principals expect. Sums referable to investment management services performed in the United Kingdom can remain within the disguised investment management fee rules even when they arise after you leave. Moreover, the temporary non-residence rules can recapture amounts if you return within the statutory window, as we explain in our guide to the UK five-year temporary non-residence rule.
Case Study: A London Partner at a Mid-Market Buyout Fund
Consider Rachel, an American citizen who moved to London in 2019 and became a partner in a UK limited liability partnership advising a Luxembourg fund. She committed £600,000 of personal capital at the fund's launch. Additionally, she received a carried interest entitlement.
The Numbers
In 2026-27 Rachel received £1.4 million described as carried interest. However, the fund's average holding period measured thirty-four months, because two portfolio companies were sold early in a competitive auction. That figure sat below the thirty-six month floor.
The whole £1.4 million therefore became income-based carried interest, charged as a disguised investment management fee at forty-seven per cent. Her UK liability reached roughly £658,000. Had the holding period exceeded forty months, the 72.5 per cent multiplier would have produced approximately £477,000, a difference near £181,000.
Where the Credit Broke
Rachel's American return treated part of the reward as long-term capital gain, because two investments satisfied the three-year test in section 1061. Consequently, her British tax sat in the general basket while the American income sat in a capital category. Roughly £74,000 of credit had nowhere to go, purely because the disguised investment management fee charge and the American characterisation disagreed.
Separately, her £600,000 co-investment return failed the arm's length test. The partnership deed gave managers a preferential entry price, which no external investor received. We also found four unfiled Form 8865 years and unreported signature authority over the fund's accounts.
Missed Reporting and the Route Back
Fund principals frequently keep immaculate British records while their American filings lapse entirely. Fortunately, structured remedies exist for exactly this pattern.
The Forms Principals Forget
An interest in a foreign partnership generally requires Form 8865, with penalties starting at $10,000 per form per year. Furthermore, you report foreign accounts through the FBAR filed with FinCEN, submitted via the BSA E-Filing System. Critically, signature authority alone creates that duty.
Fund principals hold authority over trading, custody and subscription accounts routinely. Consequently, reported balances often dwarf personal wealth. Our FBAR and FATCA reporting service addresses this directly.
The Streamlined Option
The IRS Streamlined Filing Compliance Procedures allow non-wilful filers abroad to submit three years of returns and six years of FBARs without penalty. However, eligibility ends once an enquiry opens. Therefore, act before contact rather than afterwards, and never certify non-wilfulness casually.
How TaxYork Can Help
We prepare US and UK tax returns for partners, principals and founders across the London fund community. Specifically, we test every sum you receive against the disguised investment management fee rules, then reconcile the result with your American filings.
Our work covers the arm's length co-investment evidence, average holding period analysis, foreign tax credit basket planning and streamlined catch-up submissions. Moreover, we coordinate with your fund counsel so the tax position matches the documents. We also handle US tax returns for expats, and our related guidance covers the Investment Manager Exemption for US fund principals and Section 457A on deferred offshore fees.
Conclusion
The disguised investment management fee rules did not change in April 2026, yet their consequences did. Above all, the reformed carried interest regime turned the fee boundary into a 12.9-point question rather than a capital-versus-income question. Commentary written before 2026 will mislead you.
Two actions follow. Firstly, evidence your co-investment terms against genuine external investors now. Secondly, model the average holding period before the fund's realisations fix it. Ultimately, your American return determines whether British tax paid actually relieves anything.
Contact Us
Speak to a specialist about the disguised investment management fee rules and your US filing position. Email hello@taxyork.com or telephone 020 3488 8606. Alternatively, book a consultation and we will review your fund documents, your returns and any missed reporting in confidence.
Disclaimer
This article provides general information about the disguised investment management fee rules and related US and UK tax obligations. It does not constitute tax advice and should not be relied upon in isolation. Tax rules change frequently, and outcomes depend entirely on individual circumstances. Figures cited reflect published guidance current at the date of writing. Always obtain professional advice tailored to your position before acting. TaxYork accepts no liability for action taken on the basis of this article alone.