An American partner in a British LLP: Form 8865, classification and the years you missed

Figures relate to tax year 2025 (US) · 2025-26 (UK)

You made partner at a London law firm, which runs as a limited liability partnership. Your share of profit arrives monthly and HMRC taxes it through Self Assessment. The American side is less tidy.

Form 8865 may apply, or a different form entirely. It depends on how the IRS classifies the firm.

Classification comes first and decides everything after it. So this guide covers how America sees a British LLP and when the form applies. Then it covers what the form asks for, and how partners who never filed can put it right.

Key takeaways

• America classifies a UK LLP under its own entity rules, not by the name on the certificate.
• An LLP where every member has limited liability defaults to corporate status unless it elected otherwise.
• Many large LLPs have made that election, so they count as partnerships for US purposes.
• Form 8865 reports interests in foreign partnerships, but only certain partners must file it.
• A small percentage partner in a big firm often has no filing duty unless a category applies.
• Missed forms can usually come into a streamlined filing, and the IRS generally waives the penalties.
• Check the position every year, because a capital call or promotion can trigger a new filing.

What is Form 8865?

It is the information return Americans file about foreign partnerships. It covers partnerships you control, hold a large stake in, put property into, or buy and sell stakes in. It reports the partnership's accounts and your dealings with it. Like Form 5471, it creates no tax on its own, but missing it carries penalties.

Your share of profit still reaches your return through the ordinary partnership rules. The form sits alongside that reporting rather than replacing it.

How does America classify a UK LLP?

Under its check-the-box rules. A foreign entity where every member has limited liability defaults to being a corporation for US purposes. A UK LLP fits that description. Without an election, the IRS would treat it as a company rather than a partnership.

Many LLPs with American partners have elected partnership status instead. The firm makes that election on Form 8832, often soon after formation. It changes which information return applies to each American member.

So the first question to ask the firm is simple. Has it elected partnership status for US purposes, and from what date? Finance teams at larger firms usually know the answer immediately.

The four Form 8865 categories

Once the LLP counts as a partnership, the categories decide who files. Category 1 covers Americans who control the partnership with more than 50%. Category 2 covers Americans holding 10% or more while other Americans control it.

Category 3 covers contributions of property, which can include capital contributed on joining the partnership. Category 4 covers acquisitions or disposals that cross a 10% line.

A partner holding half a percent of a large firm often falls into none of these. But capital contributions on admission can trigger category 3, depending on the amount and the resulting interest.

Does a small partner in a big firm need to file?

Often not, but the capital contribution needs checking. A partner with a small share may have no filing duty in an ordinary year, where non-Americans control the firm. The year of admission, when capital goes in, is the one most likely to need the form.

In our practice the admission year is where most partners slip. The capital loan, the contribution and the new profit share all land at once, and nobody mentions the American form.

How is your profit share taxed in America?

As partnership income, where the LLP counts as a partnership. Your distributive share goes on your return whether or not you draw it, converted into dollars. Britain taxes the same profit through Self Assessment, and the foreign tax credit relieves the overlap.

Timing differs between the two systems. Britain moved to taxing partnership profit on a tax year basis from 2024-25. America follows the calendar year and the partnership's own year end. Those periods rarely line up neatly.

Self-employment tax can apply to a partner's share as well. A certificate of coverage showing British National Insurance can remove that charge. Check it in the first year of partnership.

What about partners who move between countries?

The profit share follows you, but the credits shift. A partner who moves from London to New York stays a partner in the same firm. Britain may still tax profit from British work, and America now taxes everything as the home country. The timing of the move matters a great deal.

Plan the move with the firm's tax team. Ask which days count where. Ask how the firm splits profit for a partner who changes office. Get the answers in writing.

Salaried partners and fixed-share partners

Not every partner is a partner in the tax sense. Britain has rules that treat some salaried members of an LLP as employees. Their pay then runs through PAYE, like a salary.

America may see the same person differently. A fixed-share partner can still count as a partner for US purposes. So check both sides. Do not assume the British answer carries across.

A worked example

The figures below are illustrative. Take an example. An American lawyer becomes a partner in a London LLP in May 2023. She puts in £150,000 of capital, funded by a bank loan, for a 0.4% profit share.

The LLP elected partnership status years ago. The contribution may bring a category 3 filing in 2023. The small ongoing interest brings no filing in later years unless something changes.

The partner filed American returns reporting salary as a senior associate, then carried on as if nothing had changed. Nobody filed the 2023 form, and the returns reported the profit share inconsistently.

A streamlined filing brings the missing form in with amended returns. The amended returns restate the profit share as partnership income. Credits change to match. The IRS generally waives penalties for the late form.

Bringing missed Form 8865 filings into a streamlined filing

The foreign version of the streamlined procedures allows late information returns alongside three years of amended or delinquent income tax returns. According to IRS guidance on the procedures, the IRS generally waives penalties for those late forms. You must be eligible and non-willful.

Where the income tax returns were already correct, the separate route for late information returns may suit better. The choice turns on whether profit was also misreported.

1. Ask the LLP whether it elected partnership status for US purposes, and from when.
2. Confirm your profit share, capital contributions and any changes in each year.
3. Test each year against the four Form 8865 categories, or Form 5471 if no election exists.
4. Obtain the LLP's accounts and your partner tax statements for every year concerned.
5. Restate your profit share as partnership income where your returns treated it differently.
6. Decide between the streamlined procedures and the delinquent information return route.
7. Check self-employment tax and apply for a certificate of coverage if it applies.

How often do you need to check?

Every year, briefly. Most years nothing changes and no form is due. But a new capital call, a promotion to equity partner or a change in the firm's ownership can each trigger a filing.

Keep a one-page note for each year. Record your share, your capital and any changes. It takes minutes. It also saves hours when a question comes years later.

Share the note with whoever prepares your American return. It answers the first three questions they will ask, before they have to ask them.

Does the firm's year end matter?

Yes. Many professional firms close their books on 30 April or 31 March. America taxes your share of the partnership year that ends inside your calendar year. So a firm year ending April 2025 feeds your 2025 American return.

Britain now looks at the tax year instead, apportioning profit from the firm's accounts. The two returns can therefore show different profit for what feels like the same year. That is normal. It needs a clear reconciliation, not a correction.

Mistakes and penalties we see with LLP partners

• Assuming a British LLP is automatically a partnership for American purposes.
• Missing the category 3 filing triggered by the capital contribution on admission.
• Reporting drawings rather than the full distributive share of profit.
• Mixing British tax year figures with American calendar year figures.
• Paying self-employment tax on partnership profit without checking social security coverage.
• Filing amended returns quietly instead of through a formal compliance route.

The Form 8865 penalty starts at $10,000 per form per year, with more after an IRS notice. As with Form 5471, a missing form can keep the statute of limitations open on the related return.

Do you need FBARs for the firm's accounts?

Usually not for the firm's own bank accounts, unless you have signature authority over them. Partners who sign on client or office accounts may have a reporting duty. The rules for signature authority are narrow, so check your actual role rather than your title.

Your own accounts are a different matter. A capital loan account, a personal current account and any savings in Britain all belong on your FBAR if the totals cross the threshold.

What happens when you retire from the partnership?

Your capital comes back to you, and that can be a reportable event. A retirement that takes your interest below a 10% line, or returns capital, may bring a category 4 filing. The final profit share also needs care, because the two tax years end at different points.

Annuity payments from some older firms raise their own questions. America may treat them as partnership income for years after you leave. So plan the exit with both returns in view.

What should you ask the firm for?

Ask for the US classification and its election date. Then the partnership's accounts, your capital account, and your profit share for each year. Larger firms with several American partners often produce a US-style statement already. Smaller ones may need a clear, written request.

Ask in the first month of partnership rather than at the first American deadline. Our guide to US secondments covers staff who have not yet made partner. Our guide to the certificate of coverage explains the social security fix.

How US UK Tax Accountants helps

We confirm the classification with the firm and work out which forms apply each year. Then we prepare the partnership reporting with your personal return. Where you missed years, we package them properly.

Partner in a British LLP with a US passport? Get in touch. We will set out the position alongside our streamlined filing work.

Last reviewed 22 September 2026. This article is general information and not personal tax advice. Classification depends on elections the firm may or may not have made, so confirm it before filing anything.