UK LLP US Tax: How American Doctors and Lawyers in UK LLPs Are Taxed

UK LLP US tax turns on one question: has the LLP elected to be a partnership for US purposes? HMRC always taxes a trading UK LLP as a partnership. The IRS treats it as a corporation by default, because every member has limited liability. A US citizen partner's filings, self-employment tax and foreign tax credits all follow from that classification. This guide is for American doctors, lawyers and other professionals who are members of UK LLPs.

Most American partners in London law firms, accountancy practices, medical groups and consultancies assume the US sees their firm the way the UK does. Often it does, because the firm has made a US election. Sometimes it does not, and the partner has been filing on the wrong basis for years. The answer is a single fact about the firm, and it is worth confirming before anything else.

How does HMRC tax a UK LLP and its members?

HMRC taxes a UK LLP as a partnership when it carries on a business with a view to profit. The HMRC Partnership Manual at PM131450 states that in that case the activities of the LLP are treated as carried on in partnership by its members, and not by the LLP itself, under section 863 of the Income Tax (Trading and Other Income) Act 2005. The LLP pays no Income Tax or Corporation Tax on its profits.

Each member is taxed on their own share of profit through Self Assessment, as a self-employed partner. For 2026/27 the self-employed National Insurance rates are Class 4 at 6% on profits between £12,570 and £50,270 and 2% above £50,270. Class 2 is treated as paid for anyone with profits of £7,105 or more.

Two further UK rules matter for professionals:

• Tax year basis. Since basis period reform, partners have been taxed from 2024/25 on the profits arising in the tax year, whatever the firm's accounting date. A firm with a 30 April year end now apportions profits across two tax years, which often means estimated figures and amended returns.
• Salaried members. Under the rules summarised at PM251010, a member is taxed as an employee if all three conditions are met: pay that is substantially fixed and not linked to overall profitability, no significant influence over the firm, and a capital contribution of less than 25% of that disguised salary. Many junior or fixed-share partners are in this category.

Our guide to Self Assessment for self-employed Americans in the UK covers the UK filing mechanics in more detail.

How does the IRS classify a UK LLP for US tax?

The IRS classifies a UK LLP as a corporation unless the LLP has elected otherwise. Under Treasury Regulation 301.7701-3(b)(2), a foreign eligible entity with two or more members is a partnership only if at least one member does not have limited liability. If all members have limited liability, it is an association taxable as a corporation. Every member of a UK LLP has limited liability, so the default is corporate.

The LLP can change that by filing Form 8832, the entity classification election. An election cannot take effect more than 75 days before it is filed or more than 12 months after. Once an entity elects to change its classification, it generally cannot change again for 60 months.

US status of the UK LLP	How the US citizen partner is taxed	Main US filings
Partnership (Form 8832 election made)	Taxed each year on their distributive share of profit, as in the UK	Form 1040 with Schedule E; Form 1116; possibly Form 8865; certificate of coverage for self-employment tax
Corporation (default, no election)	Taxed on distributions as dividends, unless the CFC or PFIC rules apply	Possibly Form 5471 or Form 8621; Form 1116 with a timing mismatch
Salaried member of either	UK sees an employee; the US view depends on the LLP's classification and the member's rights	Needs case-by-case review

Large international firms with American partners usually make the election, because the partnership treatment matches the UK treatment and lets UK tax flow through as a credit. Smaller firms, medical LLPs and newly formed practices often have not, simply because nobody in the firm files a US return.

Has your UK LLP made a US election? How to find out

The firm's finance team or its US tax adviser will know. Ask three direct questions:

1. Has the LLP filed Form 8832, and from what date? An election effective from formation is the cleanest position. An election made later is treated as a change of classification, which has its own US consequences.
2. Does the LLP prepare US partner information each year? Firms with US partners often provide a statement of each partner's share of income, deductions and UK tax, restated in US dollars. Without one, the partner has to build it from UK accounts.
3. Has anyone checked the firm's US filing obligations as a foreign partnership? A foreign partnership with US partners can have its own US reporting depending on its income. That is the firm's question, but its answer affects what the partner receives.

If the answer is that no election exists, do not assume one can be made retrospectively. The 75-day limit applies, and late relief has conditions. Take advice before filing anything further.

UK LLP US tax when the LLP is a partnership

When the LLP is a partnership for US tax, the US citizen partner reports their distributive share of the firm's income each year, whether or not it is drawn. The UK and US results are close in principle but differ in the detail.

Timing and currency

The US taxes a partner on their share of the partnership's income for the partnership year ending within the partner's tax year. The UK now taxes the profit arising in the tax year from 6 April to 5 April. A firm with a 31 March year end lines up neatly with the UK. On the US side, the same profit can fall in a different US year from the one the UK uses, so the UK tax on it has to be matched carefully when the foreign tax credit is claimed. Every figure is converted to US dollars.

Foreign tax credit or foreign earned income exclusion?

The foreign earned income exclusion is $132,900 for tax year 2026. IRS Publication 54 explains that where capital is a material income-producing factor, no more than 30% of a business's net income counts as earned income, and gives an example of a partner in a firm where capital is not material excluding part of their share. A professional services firm is normally in that second group, so a lawyer's or doctor's profit share is earned income.

For a senior partner, the exclusion rarely helps. Profit shares are usually far above the exclusion limit, and UK Income Tax on that income is generally higher than US tax on it. The foreign tax credit on Form 1116 lets UK tax offset the US tax on the same income, and, under IRS Publication 514, unused credit can be carried back one year and forward ten. Our guide to foreign tax credit relief for UK taxes sets out the mechanics.

Form 8865 and the capital contribution

New partners in UK firms are commonly asked to contribute capital, often funded by a bank loan. The Instructions for Form 8865 make a US person who contributes property to a foreign partnership a Category 3 filer if they own 10% or more immediately afterwards, or if the property contributed in the 12 months ending on the date of transfer is worth more than $100,000. The instructions confirm that cash-only transfers are within Category 3, with a lighter schedule for small cash contributors.

The penalty for failing to report a Category 3 contribution is 10% of the fair market value of the property contributed, capped at $100,000 unless the failure was due to intentional disregard. This is the filing most often missed by American lawyers joining a London partnership.

Do US citizen partners in UK LLPs pay US self-employment tax?

A US citizen partner who lives in the UK usually does not pay US self-employment tax on their profit share, provided they claim the exemption properly. The US-UK social security agreement assigns a self-employed person's coverage to the country where they reside: the Social Security Administration's guidance describes the rule as assigning coverage to the country in which the worker is a resident.

The exemption is not automatic. The IRS page on self-employment tax for businesses abroad says to request a certificate of coverage from the foreign country's agency, attach a photocopy to Form 1040 each year the exemption applies, and print Exempt, see attached statement on the self-employment tax line. For a UK resident, that certificate comes from HMRC.

Two cases need more care. A partner who lives in the US but is a member of a UK firm is covered by US Social Security, not UK National Insurance. A salaried member taxed as an employee in the UK pays Class 1 contributions through PAYE, and the employee rules of the agreement, not the self-employed rule, are the starting point. Our article on National Insurance for Americans in the UK explains the agreement more fully.

What if the UK LLP is a corporation for US tax?

Without an election, the US citizen partner is treated as a shareholder in a foreign corporation. That produces a structural mismatch with the UK. HMRC taxes the partner on the profit as it arises. The US, outside the anti-deferral rules, taxes the partner only when the firm makes a distribution, which the US treats as a dividend.

• Foreign tax credits fall out of step. UK tax is paid on profit in one year, while the US income arises when the profit is drawn. Matching the two is difficult, and some UK tax can go unrelieved if the years and income categories do not line up.
• Information returns can apply. Form 5471 can be required where US persons own 10% or more, or together own more than 50% so that the LLP is a controlled foreign corporation. That is unusual in a large firm but possible in a small practice owned by American doctors.
• PFIC status should be tested. A professional firm earning fees is not normally a passive foreign investment company, but a small LLP holding large cash balances or investments should be checked. Our guide to the PFIC definition sets out the income and asset tests.
• Self-employment tax works differently. A dividend from a corporation is not self-employment income, so the certificate of coverage question changes. The UK still charges Class 4 on the profit share.

The same corporate-default problem affects US citizens who hold UK property through a limited company; our article on the UK property company for a US citizen covers the check-the-box election in that context.

Doctors and lawyers: what is specific to each profession

American doctors in UK medical LLPs

Consultants in private practice often join a group LLP for billing, premises and shared staff. These are frequently smaller firms with no US election and no US-reporting habit, which makes the default corporate classification a real risk. A doctor who also works in the NHS is an employee for that work and may be in the NHS Pension Scheme, which raises separate US questions covered in our guide to UK pensions and the US tax treaty.

American lawyers in London law firm LLPs

International law firms are usually large, have many US partners, and have made the election. The common traps are personal: the capital contribution on Form 8865, the certificate of coverage, the treatment of interest on a partner capital loan, and the gap between fixed-share and full equity status. A fixed-share partner can meet the salaried member conditions in the UK while being a partner in US terms, and both returns need to tell a consistent story.

A worked example: a US lawyer joining a London LLP

Illustrative example, with invented facts: a US citizen lawyer living in London becomes an equity partner in a UK LLP on 1 May 2026 and contributes £200,000 of capital, funded by a bank loan. The firm confirms it filed Form 8832 to be treated as a partnership from formation. Because the contribution is worth more than $100,000, she is a Category 3 filer of Form 8865 for 2026. She reports her distributive share on her 2026 Form 1040, claims a foreign tax credit for the UK Income Tax on it rather than the foreign earned income exclusion, and attaches the HMRC certificate of coverage so that her profit share is exempt from US self-employment tax. In the UK she files Self Assessment for 2026/27 and pays Class 4 National Insurance on her profit share.

Had the firm not made an election, the same facts would produce a different US return: no Form 8865, possible foreign corporation reporting instead, and US tax on her drawings as dividends, with the UK tax on her profit share harder to credit.

What people get wrong about UK LLP US tax

• Assuming UK transparency means US transparency. The UK statute does not decide the US classification. The US regulations do.
• Missing the capital contribution. A small percentage interest does not avoid Form 8865 when the capital paid in exceeds $100,000.
• Paying US self-employment tax unnecessarily, or skipping the certificate. Without a certificate of coverage attached, the IRS expects self-employment tax on a partnership profit share.
• Leaving FBAR out. Partners must report their own UK accounts on the FBAR, and any signature authority over LLP accounts. Our guide to FBAR requirements for expats explains the $10,000 test.

Getting UK LLP US tax right

The order of work is simple: confirm the US classification, then the self-employment tax position, then the credit and reporting position. Each step depends on the one before. Our UK LLP US tax work for partners covers the classification review, Form 8865, Form 1116 and the UK Self Assessment together. US/UK Cross Border Tax is US CPAs and UK tax advisers working as one team, with offices in London, Manchester, New York and San Francisco. We act for Americans living in the UK at every stage of a professional career. To review your position, contact us.