US UK Tax Accountant for Fund Managers: LLPs, K-1s and PFICs
A UK LLP is a corporation for US tax unless someone elects otherwise, and that one fact decides which forms a fund manager files. Here is a vehicle-by-vehicle filing map, the K-1 timing problem and a worked example with a profit share and carry.
A London fund partner who is also a US taxpayer reports the same profit share and carry to two tax authorities, under different labels.
Written by the US UK Tax Experts team, cross-border tax specialists
US UK tax accountant for fund managers: an introduction
A US UK tax accountant for fund managers starts with one question most people skip: what is each vehicle in the structure for US tax purposes? A US citizen or green card holder in a London fund house rarely holds one simple interest. Instead, you may hold an LLP membership, a co-invest, a carry vehicle and perhaps a feeder fund. Each one can trigger a different US form. The UK sees the same structure through different rules, so the two returns need mapping before anyone prepares either.
This article supports our guide for US and UK founders and executives. For the rates on carry itself, read our separate article on carried interest tax for a US person in the UK. Here, the focus is on the filing map.
What a US UK tax accountant for fund managers actually checks
The work is a classification exercise first and a calculation second. We list every entity you hold an interest in, directly or indirectly. Next, we record how the US classifies it and how the UK classifies it. Only then do the forms follow. In our experience, most errors in this area come from a wrong assumption about an entity, not from wrong arithmetic.
Why the usual advice falls short
General expat guidance assumes a salary, a pension and an ISA. Fund income does not fit that shape. A profit share is not a salary, and carry is not an ordinary gain. Moreover, the documents you need usually arrive after the first UK deadline has passed. Therefore, any review by a US UK tax accountant for fund managers should begin with the fund documents, not last year's return.
Is a UK LLP a partnership for US tax?
Not automatically. Under the US default rules, a foreign entity whose members all have limited liability is treated as a corporation, unless it elects otherwise. A UK LLP gives its members limited liability, so this rule catches it.
The default rule and the election
The rule sits in Treasury Regulation 301.7701-3. A foreign eligible entity with two or more members is a partnership only if at least one member lacks limited liability. Otherwise, it is an association taxed as a corporation. An LLP can change that treatment by filing an entity classification election on Form 8832.
Timing matters here. The effective date cannot be more than 75 days before the filing date, nor more than 12 months after it. Furthermore, once an entity elects to change, it generally cannot change again for 60 months. Late-election relief may exist, but you should not assume it.
Why the answer changes your forms
If the LLP has elected partnership status, you are looking at Form 8865 and a share of partnership income. If it has not, you may hold shares in a foreign corporation for US purposes. That can mean Form 5471 and the controlled foreign corporation rules. Consequently, your first request to the firm's finance team should be simple: has this LLP ever filed Form 8832, and from what date?
The UK sees something else entirely
For UK tax, an LLP carrying on a business is generally transparent, so members are taxed on their shares. HMRC's Partnership Manual covers this treatment. However, the salaried member rules can treat a member as an employee. They apply when pay is largely fixed, the member lacks significant influence and capital is below the set level. So a junior member may be on PAYE in the UK and still hold an LLP interest for US reporting.
Which US form goes with which fund vehicle?
Each vehicle follows from its classification and your percentage. A US UK tax accountant for fund managers works through the structure one holding at a time, using the four steps below.
Step 1: the management vehicle
Start with the LLP or company that receives management fees. If it is a partnership for US tax, check the Form 8865 filer categories. Category 1 means you control the partnership with more than 50%. Category 2 means you own 10% or more while US persons who each hold 10% or more control it. Therefore, a minority American member of a mainly British LLP often falls outside the first two categories.
That does not end the question. Category 3 can apply when you contribute property for an interest, including where you hold 10% or more afterwards. It can also apply when contributions in a 12-month period exceed $100,000. Category 4 covers acquisitions and disposals around the 10% level. Capital contributions on joining a partnership therefore need checking every year.
Step 2: the carry vehicle
Carry often sits in a separate partnership. Delaware vehicles issue a Schedule K-1, whereas Jersey, Guernsey or English limited partnerships may need separate classification work. Next, test the holding period. Under section 1061, gain on an applicable partnership interest needs a three-year holding period to stay long-term. The test looks at the partnership's position as well as yours, so the K-1 footnotes matter.
Step 3: the co-invest and feeder funds
Co-investments can create a passive foreign investment company problem. A foreign corporate feeder or portfolio company may be a PFIC. Additionally, you can own a PFIC indirectly through a partnership. The Form 8621 instructions explain who must file and how indirect holdings work. Our guide to PFIC reporting covers the regime in more detail.
Step 4: the accounts themselves
Finally, list every UK account you can reach, including signature authority over firm or fund accounts. FBAR and Form 8938 rules look at these separately. Our FBAR and FATCA guide sets out the tests. Signature authority at work is a common omission among senior finance staff.
How does a worked example look?
The two returns can show very different pictures for the same year. Consider a typical case, using invented figures and an assumed rate of $1.30 to the pound.
The facts
Daniel is a US citizen and a member of a London LLP that elected partnership status years ago. He holds 4% of the LLP. In the UK's 2026 to 2027 tax year, his profit share is £400,000. In the same year he also receives £500,000 of carried interest that meets the UK's qualifying test. All figures are examples only.
The UK side
Since 6 April 2026, the UK taxes carry as trading profits. Under the revised carried interest regime, only 72.5% of qualifying profits is brought in. Daniel therefore has £362,500 of taxable carry. At the 45% additional rate of income tax, that costs £163,125 before any National Insurance. In dollars, the income tax is about $212,063.
The US side
Suppose the carry's holding periods all exceed three years, and the K-1 shows long-term gain. At the 20% top rate in section 1, US tax on $650,000 is $130,000. The net investment income tax adds 3.8%, or $24,700. UK tax can cover the $130,000, subject to the limit on Form 1116. However, the regulations say foreign tax credits are not allowed against the 3.8% tax. Daniel therefore pays that $24,700 to the IRS on top.
What the example shows
The UK tax exceeds the US tax on the carry by about $82,000. That excess does not vanish, but it may be hard to use. Carryover works within separate categories, and UK tax on deemed trading profits may not sit in the same category as a US capital gain. Practice on this category question is still developing, so we record the reasoning on the file. Meanwhile, a short holding period would turn the same K-1 into short-term gain at ordinary rates.
When do the documents arrive compared with the deadlines?
Usually too late for the first deadline. The UK online deadline is 31 January, and K-1s from large funds often arrive around then or later. Therefore, you should plan for estimates.
A calendar that works
Americans abroad have an automatic two-month extension to file, although interest runs from the April date. A further extension to October is available on request. Most fund partners need it. The UK has no equivalent for a late K-1, so the Self Assessment return may rest on provisional figures and later need amending.
Two tax years, one set of numbers
The UK year ends on 5 April, whereas the US year and most fund years end on 31 December. A profit allocation therefore lands in different periods on each return. Consequently, foreign tax credits rarely line up neatly. We keep one schedule that follows each item of income from the fund's accounts to both returns, so that an HMRC or IRS question can be answered quickly.
What goes wrong most often?
Four mistakes recur, and most can be spotted from the fund papers. A good US UK tax accountant for fund managers looks for these before preparing anything.
Assuming every LLP is a partnership
This is the largest single trap. If no election was filed, partnership-style reporting may be wrong for every year you have been a member. The Form 8865 penalty is $10,000 per partnership per year for Category 1 and 2 filers, with further amounts after an IRS notice. Similar penalties exist for Form 5471. Moreover, a missing form can also reduce foreign tax credits.
Treating self-employment tax as settled
A profit share can raise US self-employment tax questions. The limited partner exclusion in section 1402 is contested, particularly for active managers. In contrast, a person covered by UK National Insurance can look to the totalization agreement. We obtain or confirm the certificate of coverage where we can, because it gives the cleanest answer.
Mismatching the UK and US labels
A management fee, a profit share and carry have different labels in each country. Copying a UK figure across to a US form rarely works. Instead, the US figure comes from the K-1 or the entity's own US accounts. The UK figure comes from the partnership statement. A reconciliation then explains the difference.
Forgetting the catch-up route
If forms were missed, the right fix depends on the facts. Our IRS Streamlined Filing guide explains when non-wilful taxpayers may use those procedures. Note that eligibility requires a certification of non-wilful conduct, and senior finance professionals should think carefully before signing one. A candid review comes first.
What changes when you join or leave a partnership?
Joining and leaving are both reporting events, and neither appears on a payslip. A US UK tax accountant for fund managers therefore asks about capital movements each year, not just income.
On joining
A new partner usually contributes capital, often funded by a loan. Under the Form 8865 rules, that contribution can bring Category 3 into play. The penalty for missing it is 10% of the property's value, capped at $100,000 unless the failure was intentional. Moreover, the transferor may have to recognise gain. A cash contribution rarely causes a gain, but the form can still apply.
On leaving
A partner who leaves may have a reportable disposal under Category 4, and may keep trailing carry for many years. In that case, K-1s continue to arrive after you have left the firm. If you also leave the UK, the UK regime can still reach carry that relates to services performed in the UK. Keep your records of where you worked, because they support both returns.
Questions to ask at the start
Before you appoint a US UK tax accountant for fund managers, ask how they will obtain the entity elections, who reconciles K-1s to partnership statements and how late documents are handled. Ask too how contested positions are recorded. Clear answers to these questions matter more than a long list of services. They also show whether the two returns will really be prepared from one set of numbers.
What your US UK tax accountant for fund managers should hand back
You should expect a one-page map at the end of the first review. It lists each vehicle, its US and UK treatment, the forms due and the document that proves each point. A US UK tax accountant for fund managers can then update the map every year as interests change, which saves repeating the exercise from scratch.
How US UK Tax Experts can help
US UK Tax Experts prepares and files your US and UK returns from one file, so the two agree. We work out how each fund vehicle is treated, prepare the partnership and corporate information forms, and reconcile K-1s to your partnership statements. Our US federal return service and UK Self Assessment service work from the same schedule. We do not give investment or financial advice.
Conclusion
The forms follow the classification, not the other way round. Therefore, find out whether your LLP has elected partnership status, map each fund vehicle, and plan your calendar around late K-1s. A US UK tax accountant for fund managers can then model both returns with the real numbers. Above all, do not assume last year's return got the classification right.
Contact us
If you hold LLP, carry or co-invest interests and pay tax in both countries, email hello@usuktaxexperts.com or use our contact page. We reply within one working day.
Frequently asked questions
By default, a UK LLP is treated as a corporation for US tax because all its members have limited liability. It becomes a partnership only if it files Form 8832 to elect that status. Ask the firm's finance team whether an election was filed and from what date.
Possibly, even though a small holding usually falls outside Categories 1 and 2. Category 3 can apply to contributions of more than $100,000 in 12 months, and Category 4 can apply around the 10% level. Each year's capital movements need checking.
We need the fund and LLP agreements, any Form 8832 filing, your K-1s and your UK partnership statements. A list of every account you can sign on also helps. A US UK tax accountant for fund managers uses these to map each vehicle to its forms before preparing either return.
You file the UK return on time using reasonable provisional figures, then amend it if needed. On the US side, Americans abroad get an automatic two-month extension and can request one to October. Interest on any US tax still runs from the April date.
Yes, a co-investment can give you a direct or indirect holding in a passive foreign investment company. Foreign corporate feeders and some portfolio companies are the usual examples. You can hold a PFIC through a partnership, so the structure chart must be followed all the way down.
It can, and the limited partner exclusion is contested for active managers. A member covered by UK National Insurance can usually rely on the US-UK totalization agreement instead. A certificate of coverage is the cleanest evidence.
