US and UK Tax Advisors Treaty Benefits for Fund Principals |

US and UK Tax Advisors Treaty Benefits for Fund Principals |

US and UK Tax Advisors: Treaty Benefits for Fund Principals

US and UK Tax Advisors for UK Fund Principals and Managers

US and UK tax advisors who work with American fund principals and investment managers based in the United Kingdom address one of the most technically demanding intersections of US and UK tax law — because the fund structure itself, the character of carried interest and management fees, the PFIC classification of fund investments, and the treaty treatment of independent personal services income all interact in ways that require simultaneous expertise in both systems. Furthermore, the US-UK treaty provides specific relief for independent personal services income under Article 14, which may be relevant where fund managers operate through UK LLP structures or receive management fees as independent practitioners rather than as employees. Additionally, carried interest — the share of fund profits allocated to the fund principal as a performance return — is treated very differently under UK law (which taxes it as capital gains with special rules under the Investment Manager Exemption) and under US law (which taxes it as ordinary income in many structures, with capital gain treatment available only under specific conditions). Consequently, the complete US and UK tax advisors service for a US-citizen UK fund principal must address the treaty position for the management fee income, the character of the carried interest for US purposes, the PFIC classification of the fund's underlying investments, and the FBAR and Form 8938 for the fund interest itself — a multi-layered analysis that is unique to this sector.

Article 14: Independent Personal Services

How Article 14 Works for Fund Managers

Article 14 of the US-UK treaty provides that income derived by a UK resident from the performance of personal services in an independent capacity — independent personal services — is taxable only in the United Kingdom, unless the individual maintains a fixed base regularly available in the United States. Furthermore, for a US-citizen UK fund manager who provides investment management services through a UK LLP or as a sole trader — without a US office or permanent establishment — the management fee income from the fund is potentially covered by Article 14. Additionally, the savings clause in Article 1(4) preserves the US right to tax its citizens on worldwide income — meaning the Article 14 allocation to UK-only taxation is overridden for US citizens, and the management fee income remains US-taxable. Consequently, the treaty does not provide income tax relief on management fees for US-citizen fund managers — it merely allocates the taxing right in a way that the savings clause then overrides — and the relevant tax relief comes from the Form 1116 foreign tax credit for UK income tax on the same fees. The US-UK treaty text is at https://www.gov.uk/government/publications/usa-tax-treaties.

The Fixed Base Concept for Fund Managers

The fixed base concept in Article 14 — analogous to the permanent establishment concept in Article 7 — determines whether the United States also has a taxing right on independent personal services income. Furthermore, where a US-citizen fund manager maintains a US office, employs US-based analysts, or regularly performs investment management services from the United States — such as through extended US-based working periods — a US fixed base may exist. Additionally, the existence of a US fixed base allocates the income attributable to that fixed base to US taxation — meaning the US can tax the management fees attributable to the US-based services. Consequently, US and UK tax advisors must assess the fixed base position for every fund manager client who spends significant time working in the United States — confirming whether a US fixed base exists and what income is attributable to it under the allocation rules. The IRS treaty guidance is at https://www.irs.gov/businesses/international-businesses/united-kingdom-tax-treaty-documents.

Carried Interest: The US Character Question

How Carried Interest Is Taxed in the US

Carried interest — the performance allocation received by a fund principal as a share of fund profits — is treated for US tax purposes based on the character of the underlying fund income that generates it. Furthermore, where the fund's profits arise from long-term capital gains — investments held for more than one year — the carried interest retains the long-term capital gains character at the individual level, subject to the three-year holding period requirement introduced by the Tax Cuts and Jobs Act for carried interest in pass-through entities. Additionally, where the fund generates short-term capital gains, ordinary income, or income from pass-through entities that held assets for fewer than three years, the carried interest is taxed at ordinary income rates — potentially at the full 37% marginal rate. Consequently, the character analysis for a US-citizen fund principal's carried interest requires a fund-by-fund, year-by-year assessment of the underlying income character — a complex calculation that US and UK tax advisors perform in collaboration with the fund's own tax reporting. The IRS carried interest guidance is at https://www.irs.gov/businesses/pass-throughs/tax-reform-changes-to-pass-through-businesses.

The UK Treatment of Carried Interest

Under UK law, carried interest received by an investment fund manager is taxed as a capital gain — subject to UK CGT at 18% or 24% for residential property gains, or at 20% for other assets — subject to specific conditions under the Investment Manager Exemption and the carried interest rules for investment managers. Furthermore, the UK applies special rules to carried interest that ensure it is taxed as a capital gain rather than income, providing a lower combined UK tax rate on carried interest than on management fees. Additionally, the UK CGT on the carried interest is a creditable foreign tax on Form 1116 passive basket — available against the US capital gains tax on the same carried interest where it qualifies for long-term treatment in the US. Consequently, US and UK tax advisors model the combined UK and US tax on carried interest for each fund principal — confirming the character of the carried interest for US purposes before determining the applicable US rate and the foreign tax credit position. The HMRC carried interest guidance is at https://www.gov.uk/guidance/capital-gains-tax-fund-manager-investment-returns.

PFIC Classification of Fund Investments

Which Fund Investments Are PFICs

A US fund principal who holds a direct interest in a non-US investment fund — including the management company's co-investment interest or a personal investment in the fund itself — holds an interest in a passive foreign investment company where the fund qualifies as a PFIC. Furthermore, most non-US private equity funds, hedge funds, and venture capital funds are PFICs — they are foreign entities with primarily passive income from investment activities. Additionally, the management company's carried interest or co-investment interest in the fund is a PFIC interest — subject to the Form 8621 disclosure requirements and the choice of annual election method. Consequently, US and UK tax advisorsmust identify every fund interest held by the US-citizen fund principal and assess the PFIC status of each — filing Form 8621 with the appropriate election for each PFIC interest in the first year it is held. The IRS Form 8621 guidance is at https://www.irs.gov/forms-pubs/about-form-8621.

The Election Choice for Fund PFICs

For a US fund principal holding a carried interest or co-investment in a non-US fund, the PFIC election choice — mark-to-market or qualified electing fund election — has significant implications for the annual income reporting and the ultimate tax treatment of the carried interest. Furthermore, the QEF election — which requires the fund to provide PFIC annual information statements — treats the fund's annual earnings and net capital gains as currently includible in the US shareholder's income — matching the fund's annual income character at the shareholder level. Additionally, the mark-to-market election treats the annual increase in the fund's interest value as ordinary income, which may produce a different result from the QEF election depending on the fund's distribution pattern and investment returns. Consequently,US and UK tax advisors advise fund principals on the optimal PFIC election for each fund interest at the outset of the investment, since the choice is made in the first year and affects all subsequent years of holding. The IRS PFIC guidance is at https://www.irs.gov/forms-pubs/about-form-8621.

FBAR and Form 8938 for Fund Interests

The Fund Interest as a Foreign Financial Asset

A US-citizen fund principal who holds an interest in a non-US fund — whether as a carried interest, a co-investment, or a direct investor interest — holds a specified foreign financial asset for Form 8938 purposes. Furthermore, the value of the fund interest for Form 8938 is the fair market value at year-end, which for an illiquid private equity fund may require a valuation from the fund administrator based on the most recent net asset value. Additionally, where the fund interest is also a financial account at a foreign financial institution — which it may be where the fund is structured with a custodian account — it is also FBAR-reportable. Consequently, US and UK tax advisors assess both the FBAR and Form 8938 positions for every fund interest held by a US-citizen fund principal — confirming whether the interest qualifies as a financial account for FBAR purposes and whether the value crosses the Form 8938 threshold. The IRS Form 8938 guidance is at https://www.irs.gov/forms-pubs/about-form-8938.

The Annual Compliance Package for Fund Principals

Management Fees and the UK Self-Assessment

Management fees received by a US-citizen fund manager through a UK LLP or as a self-employed individual are reported on the UK self-assessment as trading income — with UK income tax at the applicable rate and Class 4 NIC where the Totalization Agreement Certificate of Coverage has not been obtained. Furthermore, the management fee income is also reported on Schedule C of Form 1040 for US purposes, with the foreign tax credit on Form 1116 general basket for the UK income tax on the same fees. Additionally, the UK self-assessment for a fund manager in a UK LLP includes the individual's share of the LLP profit, which may include both management fees and a profit share from the LLP's own investment activities. Consequently, the annual US and UK tax advisors package for a UK LLP fund manager includes the UK self-assessment with all LLP income components, the US Schedule C with the management fee income converted to dollars, the Form 1116 general basket credit for UK income tax, and Schedule D for any carried interest distributions. The IRS Schedule C guidance is at https://www.irs.gov/forms-pubs/about-schedule-c-form-1040.

Case Study: US Citizen, UK Fund Manager

Our team provides US and UK tax advisors for a US citizen who is a principal at a London-based private equity firm, operating through a UK LLP. Furthermore, the client receives annual management fees of approximately £180,000 as their LLP profit share — representing the management income component — and received a carried interest distribution of approximately £420,000 in the most recent year from a fund that held its investments for more than three years.

The annual US and UK tax advisors analysis covers the following. Management fees: £180,000 reported on the UK self-assessment as LLP trading profit — UK income tax at 45% of approximately £75,600. Form 1116 general basket credit for the UK income tax on the management fees — approximately $95,990 at the annual average rate — eliminates the US income tax on the management fee income, with excess credit carryforward generated. Furthermore, carried interest: £420,000 UK CGT treatment at 20% = approximately £84,000 UK CGT. US character analysis: the fund held investments for more than three years — carried interest qualifies for long-term capital gains treatment under the three-year rule. US capital gains tax at 20% plus 3.8% NIIT on the dollar equivalent of approximately $533,400 — approximately $126,400. Foreign tax credit for UK CGT of £84,000 ($106,680) — creditable on Form 1116 passive basket. Net US capital gains tax: $126,400 minus $106,680 = $19,720. Additionally, the client holds two co-investment PFIC interests — Form 8621 with QEF election filed for each, annual earnings included as ordinary income. Consequently, the annual compliance package for this client includes the UK self-assessment, Form 1040 with two Forms 1116, Schedule C for management fees, Schedule D for carried interest, two Forms 8621, FBAR for the LLP capital account (as a financial account), and Form 8938.

Common Fund Manager Tax Mistakes

Not Confirming the Carried Interest Holding Period

The most financially significant error for US-citizen fund principals is not confirming whether the carried interest qualifies for long-term capital gains treatment under the three-year holding period rule. Furthermore, carried interest from a fund where investments were held for fewer than three years is taxed at ordinary income rates in the US — not long-term rates — producing a dramatically different US tax outcome. The correct approach requires US and UK tax advisors to obtain the fund's underlying investment holding period data before characterising the carried interest for US Schedule D purposes.

Not Filing Form 8621 for Co-Investment Interests

Co-investment interests held by US-citizen fund principals in non-US funds are PFICs — yet they are frequently omitted from the Form 8621 filing. Furthermore, the failure to make a timely PFIC election leaves the co-investment interest subject to the punitive excess distribution rules. The correct approach requires US and UK tax advisors to identify every co-investment and fund interest held by the fund principal at the start of the engagement and file Form 8621 with the appropriate election for each one in the first year. IRS Form 8621 guidance is at https://www.irs.gov/forms-pubs/about-form-8621.

Not Modelling the UK CGT and US Capital Gains Simultaneously

Many fund principals receive UK tax advice on carried interest without US-side modelling — discovering the residual US capital gains tax only after the distribution has been received. Furthermore, the foreign tax credit for UK CGT at 20% does not fully eliminate the US capital gains tax at 20% plus 3.8% NIIT, leaving a residual US liability. The correct approach requires US and UK tax advisors to model the combined UK and US tax on anticipated carried interest distributions before they are received, so the client can plan for the net tax position in advance.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist US and UK tax advisors for US-citizen fund principals and investment managers in the United Kingdom. Furthermore, we assess the Article 14 treaty position for management fee income, characterise carried interest for US purposes using the three-year holding period analysis, file Form 8621 for all PFIC co-investment interests with the optimal election, prepare the UK self-assessment and US Form 1040 as a single coordinated engagement, and model the combined UK and US tax on carried interest distributions before they arise. Additionally, we advise on the FBAR and Form 8938 positions for all fund interests and LLP capital accounts.

Contact our team today. Email hello@us-uktax.com call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

US-citizen fund principals in the United Kingdom face a uniquely complex annual compliance picture — management fees on Schedule C with Form 1116 general basket credit, carried interest on Schedule D with the three-year holding period analysis, and Form 1116 passive basket credit for UK CGT, and Form 8621 for every PFIC co-investment interest. Furthermore, specialist US and UK tax advisors who confirm the three-year carried interest holding period, file Form 8621 with the optimal election, and model the combined UK and US tax on carried interest distributions before they arise ensure the fund principal's annual compliance is complete, and the combined tax is correctly minimised. Moreover, the residual US capital gains tax after the UK CGT foreign tax credit — arising from the NIIT differential between the UK 20% rate and the US 20% plus 3.8% combined rate — requires specific annual modelling that neither a UK-only adviser nor a US-only adviser can perform in isolation. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

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US-UK Tax | hello@us-uktax.com | 0333-8807974

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FAQs

Q: Is management fee income taxed differently from carried interest in the US?

A: Yes. Management fees are ordinary income taxed at the marginal US rate on Schedule C. Carried interest retains the character of the underlying fund income — long-term capital gains where the three-year holding period is met, ordinary income where it is not. The two income streams require separate US characterisation analyses.

Q: What is the three-year holding period rule for carried interest?

A: The Tax Cuts and Jobs Act requires that the fund's underlying investments be held for more than three years for the carried interest to qualify for long-term capital gains treatment. Where investments are held for fewer than three years, the carried interest is taxed at ordinary income rates regardless of the long-term character of the underlying gain.

Q: Are co-investment interests in non-US funds PFICs?

A: Yes. Non-US investment funds held by US-citizen fund principals — including co-investment interests — are typically PFICs. Form 8621 must be filed for each PFIC interest in the first year it is held, with the QEF or mark-to-market election made at that time to avoid the punitive excess distribution rules.

Q: Does the Article 14 treaty provision reduce US tax on management fees?

A: No for US citizens. Article 14 allocates independent personal services income to UK-only taxation, but the savings clause in Article 1(4) overrides this for US citizens. Management fees remain US-taxable. The Form 1116 foreign tax credit for UK income tax on the fees provides the relief against double taxation.

Q: What is the residual US tax after the UK CGT credit on carried interest?

A: Where UK CGT is 20%, and the US rate is 20% plus 3.8% NIIT, the foreign tax credit for UK CGT at 20% does not fully cover the US 23.8% combined rate — leaving a residual US liability of approximately 3.8% of the gain on the NIIT portion. This residual must be modelled before carrying interest distributions are received.

Q: Must the fund principal's LLP capital account be reported on the FBAR?

A: Potentially yes, where the LLP capital account constitutes a foreign financial account at a foreign financial institution. The LLP interest is also a specified foreign financial asset for Form 8938. The FBAR and Form 8938 positions must be assessed based on the specific LLP structure and the nature of the capital account.