Introduction: Why the Investment Manager Exemption Changed on 1 January 2026
The Investment Manager Exemption was rewritten with effect from 1 January 2026, and the rewrite works decisively in your favour. Furthermore, the single condition that punished successful principals for backing their own funds has now gone entirely. However, most published commentary still describes the old regime as though nothing had moved.
If you run money from London for a Cayman, Delaware or Luxembourg vehicle, this matters twice over. Firstly, it determines whether your investors face UK tax they never priced in. Secondly, it shapes what you personally file on both sides of the Atlantic. At TaxYork, we act for American partners, portfolio managers and founders across the London fund community.
What the Investment Manager Exemption Actually Protects
The Investment Manager Exemption protects the fund, not the manager. Specifically, it stops HMRC from treating a non-resident fund as trading in the United Kingdom merely because a London-based manager makes its decisions. Consequently, the offshore vehicle stays outside the UK net on its investment profits.
Your own fee income remains fully chargeable here. Indeed, that outcome is the deliberate policy bargain. HMRC taxes the management business in Britain and, in exchange, leaves the underlying fund alone. Therefore, treating the exemption as personal protection is the most expensive misreading we encounter.
The Rule That Punished You for Backing Your Own Fund
Condition D, universally known as the twenty per cent rule, has been repealed. Previously, the Investment Manager Exemption failed where the manager and connected persons were beneficially entitled to more than twenty per cent of the non-resident's taxable profits from transactions run through that manager. Emerging managers breached it constantly.
Consider why. When you seed your own fund with substantial personal capital, your stake is counted. Accordingly, a founder holding a large general partner commitment could destroy the exemption for every other investor. From chargeable periods beginning on or after 1 January 2026, that trap has been removed by HMRC's guidance at INTM269060.
How the Investment Manager Exemption Works After the Reform
Four conditions now survive, and each must be satisfied for every transaction. Notably, the statutory home of the Investment Manager Exemption remains section 835M of the Income Tax Act 2007 for income tax, with a mirror provision in the Corporation Tax Act 2010 for corporate investors.
The Four Surviving Conditions
Condition A requires the manager to carry on a genuine business of providing investment management services, which includes investment advice. Condition B requires the transaction to occur in the ordinary course of that business. Moreover, Condition C requires the manager to act in an independent capacity.
Condition E completes the set. It requires remuneration that is not less than the customary amount for that class of business. Importantly, the finalised Statement of Practice now confirms expressly that an overall reward package of management fees plus carried interest, negotiated at arm's length, satisfies this test. Previously, that point rested on practice rather than published guidance.
The New Definition of an Investment Transaction
The reform replaced the old Investment Transactions List with an exclusionary statutory definition. Under the previous approach, an asset class qualified only if the Treasury had specifically added it. Cryptoassets, for instance, waited years before joining the list for the 2022-23 tax year following a dedicated HMRC consultation.
The new definition inverts that logic. Consequently, a transaction qualifies unless it is expressly carved out. For a digital-asset or structured-credit strategy, this removes a genuine commercial risk. Additionally, it means novel instruments no longer require a lobbying campaign before your investors can rely on the Investment Manager Exemption.
What Still Falls Outside the Exemption
Transactions in UK land remain excluded, as do physical commodities. Therefore, a London manager running a British property strategy for offshore money cannot shelter behind the Investment Manager Exemption at all. Instead, that structure needs separate analysis under the non-resident property rules.
The scope narrowing also matters. Specifically, the reformed definition ties the Investment Manager Exemption to vehicles meeting UK regulatory concepts of an investment fund. Some asset-holding companies and single-investor arrangements may therefore fall outside protection that they previously assumed. Review any bespoke managed account before the next reporting period closes.
The Independence Test and the Move From 70% to 50%
Condition C carries most of the practical risk, and it tightened while the rest of the regime loosened. HMRC applies the test through safe harbours published in Statement of Practice 1 (2001), which the finalised 2026 guidance substantially rewrote.
The Substantial Services Safe Harbour
The concentration threshold fell from seventy per cent to fifty per cent. Under the current test, services to one non-resident client are not substantial where they do not exceed half the manager's business, measured by fees or another appropriate yardstick. Above that line, independence must be argued on general principles, and the Investment Manager Exemption stands or falls on that argument.
New managers receive breathing space. Specifically, a business in its first eighteen months may exceed fifty per cent without penalty, provided it sits at or below the threshold consistently afterwards. Nevertheless, single-fund managers should model this carefully, because the tighter threshold catches boutiques that comfortably cleared seventy per cent.
Widely Held, Actively Marketed and the 18-Month Grace Period
An alternative safe harbour looks at the fund's investor base. A fund qualifies where no majority interest is ultimately held by five or fewer persons, or where no single person holds more than twenty per cent. Newly established funds again receive eighteen months from commencing UK trading to satisfy the widely held test.
Active marketing must be genuine. Accordingly, HMRC expects evidence of continuing efforts to attract third-party capital. A fund that quietly closed to new money years ago may struggle here, notwithstanding an impressive investor list on day one.
The QAHC Route to Automatic Independence
The reformed guidance added a valuable shortcut. Funds meeting the qualifying fund definition at paragraph 9(1) of Schedule 2 to the Finance Act 2022, the test used for the qualifying asset holding company regime, satisfy the independence condition automatically. Therefore, no further analysis is required.
One further clarification deserves attention. The reforms confirm that the Investment Manager Exemption sits separately from the general agent of independent status concept in domestic law and treaties. Consequently, failing the exemption no longer removes your fallback arguments on permanent establishment under HMRC's wider guidance.
What the Investment Manager Exemption Does Not Do for You Personally
Here is where sophisticated clients are caught out. The Investment Manager Exemption delivers nothing to you as an individual. Rather, it protects your investors while leaving your personal position governed by ordinary residence rules on both sides.
Your Fees, Salary and Carried Interest Remain Fully Taxable
As a UK resident, you pay British tax on worldwide income. Additional rate tax applies at forty-five per cent above £125,140, with the personal allowance of £12,570 fully withdrawn at that level under the current income tax rates. Meanwhile, thresholds stay frozen through to April 2028.
Your American citizenship adds a second charge. Specifically, the United States taxes citizens on worldwide income irrespective of residence, so your London fee income appears on a Form 1040 as well. Ultimately, relief comes through the foreign tax credit rather than through any exemption.
The Foreign Tax Credit Timing Mismatch
Sterling tax paid does not automatically wipe out the dollar liability. You claim relief on Form 1116, and credits sit in separate baskets that cannot be freely mixed. Furthermore, management fees, carry and personal investment income frequently land in different baskets.
Timing compounds the problem. The UK tax year ends on 5 April while the US year ends on 31 December, so payments on account can bunch two years of British tax into one American year. Consequently, conversion at the correct rate matters, and the IRS guidance on exchange rates should be applied consistently.
When the Exemption Fails: Your Personal UK Exposure
A failed Investment Manager Exemption creates a UK permanent establishment for the fund. For an opaque vehicle, corporation tax follows. However, where the fund is transparent, such as a Cayman limited partnership, UK trading profits are attributed to the partners themselves.
That attribution reaches your co-investors directly. Moreover, it can drag non-resident partners into UK Self Assessment and expose the general partner to assessment as the fund's UK representative. In our experience, remediating a failed year across an investor register costs far more than the review that would have prevented it.
Your US Reporting as a Principal of an Offshore Fund
American principals carry a reporting burden that has no British equivalent. Notably, these obligations arise from your citizenship and your role, not from the fund's tax position. The Investment Manager Exemption succeeding changes none of them.
Forms 8865, 5471 and 8621
A US person with an interest in a foreign partnership generally files Form 8865. Similarly, an interest in the offshore general partner company or a foreign management entity can trigger Form 5471. Penalties start at $10,000 per form, per year.
Your personal stake in a corporate feeder raises a third issue. Specifically, a non-US corporate fund is frequently a passive foreign investment company, bringing Form 8621 and the punitive excess distribution regime into play. Therefore, a qualified electing fund election should be considered before you invest, not afterwards.
FBAR and Signature Authority Over Fund Accounts
You report foreign accounts annually through the FBAR filed with FinCEN, submitted electronically via the BSA E-Filing System. Critically, signature authority alone creates the duty even where you own nothing.
Fund principals routinely hold authority over trading, custody and subscription accounts. Consequently, the aggregate reported can dwarf personal wealth. Civil penalties currently reach $16,536 for a non-wilful failure and the greater of $165,353 or half the account balance where conduct is wilful. Our FBAR and FATCA reporting service addresses exactly this exposure.
Form 8938 and the Higher Overseas Thresholds
Form 8938 duplicates much of the FBAR yet applies different tests. Living abroad and filing jointly, you report where specified foreign assets exceed $400,000 at year end or $600,000 at any point. Additionally, the IRS publishes a direct comparison of the two regimes that repays careful reading.
Partnership interests count. Therefore, your carried interest entitlement and general partner commitment belong on the form even though no bank account exists. Many otherwise meticulous principals omit precisely these items. Furthermore, a successful Investment Manager Exemption claim offers no shelter from either form.
How the US Trading Safe Harbour Compares
Washington operates its own version of the same bargain, and understanding both prevents structuring errors. The comparison rarely appears in UK commentary on the Investment Manager Exemption, yet it governs your firm's American exposure.
Where the Two Regimes Align
Under section 864(b)(2) of the Internal Revenue Code, trading in stocks, securities or commodities for a taxpayer's own account does not create a US trade or business. Similarly, trading through a resident broker or independent agent stays outside the net. Both jurisdictions therefore protect the investor while taxing the manager.
Where They Diverge and Why That Costs You
The American safe harbour is largely self-executing and demands no independence percentage. By contrast, the Investment Manager Exemption imposes concentration tests, marketing tests and remuneration tests. Consequently, a US-style structure imported wholesale into London can fail Condition C without anyone noticing.
Dealer activity breaks both regimes. Furthermore, lending and origination strategies sit awkwardly within the American safe harbour while potentially qualifying in Britain. Accordingly, credit funds with offices in both cities need genuinely parallel analysis rather than a single memorandum. Our cross-border tax planning team runs that comparison routinely.
Case Study: A US Partner at a London Credit Fund
Consider Michael, an American citizen and portfolio manager who moved to London in 2021. He is a partner in a UK limited liability partnership that manages a Cayman master fund. Additionally, he committed $4 million of personal capital to the fund at launch.
The Numbers
Michael's UK LLP profit share for 2026-27 was £780,000. British tax at forty-five per cent above £125,140, together with Class 4 contributions, produced a liability near £350,000. Meanwhile, his Cayman commitment represented twenty-six per cent of the fund's capital during the first two years.
That twenty-six per cent was the problem. Under the old Condition D, his connected stake exceeded the twenty per cent ceiling. Consequently, the Investment Manager Exemption was unavailable for those periods, and the fund's UK permanent establishment risk fell on every investor in the vehicle.
What Changed on 1 January 2026
Repeal of Condition D removed the breach prospectively. However, Michael still failed Condition C of the Investment Manager Exemption, because the master fund represented sixty-eight per cent of the LLP's fee income against the new fifty per cent threshold. The eighteen-month new business grace period had long expired.
We restructured the fee base and documented the widely held test using the fund's post-2024 investor register. Separately, Michael had never filed Forms 8865 or 8621, nor reported signature authority over four Cayman accounts holding $290 million. A streamlined submission resolved five years of exposure without penalty.
Missed Filings and the Streamlined Route Back
Non-compliance among fund principals is more common than the sector admits. Typically, the UK filings are immaculate while the American ones were never started. Fortunately, a structured remedy exists.
Who Qualifies for the Streamlined Foreign Offshore Procedures
The IRS Streamlined Filing Compliance Procedures require non-wilful conduct and, for the foreign offshore version, physical presence outside the United States for at least 330 days in one of the last three years. Qualifying filers face no failure-to-file, failure-to-pay, accuracy or information return penalties.
Wilfulness is the gating question. Therefore, a principal who ticked "no" to the foreign account question on Schedule B while running an offshore fund needs careful assessment before filing. Never certify non-wilfulness casually.
What a Catch-Up Involves
You file three years of amended or delinquent returns and six years of FBARs. Furthermore, each information return omitted in those years must be reconstructed, which for fund principals means partnership schedules, entity classifications and valuations. Our IRS Streamlined Filing service manages that reconstruction end to end.
Speed protects you. Once HMRC or the IRS opens an enquiry, the streamlined door closes. Additionally, HMRC receives account data automatically under exchange agreements, so waiting rarely improves the outcome.
How TaxYork Can Help
We prepare US and UK tax returns for principals, partners and founders across the London fund community. Specifically, we review your firm's position under the reformed Investment Manager Exemption, then reconcile it with your personal filings in both countries.
Our work covers Forms 8865, 5471, 8621 and 8938, FBAR reporting, foreign tax credit optimisation and streamlined catch-up submissions. Moreover, we coordinate with your fund counsel so that the tax analysis matches the documents. We also handle US tax returns for expats and treaty and foreign tax credit planning for the whole partner group.
Conclusion
The reformed Investment Manager Exemption is materially friendlier to founder-backed funds than the regime it replaced. Above all, repealing the twenty per cent rule ends a trap that penalised managers for aligning with their investors. Nevertheless, the tighter fifty per cent independence threshold demands fresh analysis.
Remember the central point. The Investment Manager Exemption shelters your fund, never you. Therefore, your personal American filings deserve the same rigour your firm applies to its investors. Review both before the next reporting period closes.
Contact Us
Speak to a specialist about your position under the Investment Manager Exemption and your US filing obligations. Email hello@taxyork.com or telephone 020 3488 8606. Alternatively, book a consultation and we will review your structure, your returns and any missed reporting in confidence.
Disclaimer
This article provides general information about the Investment Manager Exemption 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.