Form 1040-NR for UK Residents With US-Source Income

The Form 1040-NR UK residents must file is the United States non-resident alien income tax return, and you are pulled into it whenever you have US-source income that withholding at source has not fully and correctly settled, or income that is effectively connected with a US trade or business. In practice that means UK-resident owners of American rental property, partners in US funds and operating partnerships, sellers of US real estate, and executives who spend working days on American soil. Straightforward portfolio dividends and interest are usually handled entirely through withholding supported by a valid Form W-8BEN, and often require no return at all. Almost everything else does, and the deadlines are unforgiving.

Who actually has to file a Form 1040-NR?

A non-resident alien must file if they were engaged in a US trade or business during the year, or if they have US-source income on which the tax liability has not been satisfied in full by withholding. The Internal Revenue Service sets this out in the instructions to Form 1040-NR and in Publication 519, its tax guide for aliens. The trade or business test is broader than most UK investors expect: it can be met through a partnership, a fund, or an active rental operation, without you ever setting foot in the United States.

The second limb is where withholding does the work. If a US broker pays you a portfolio dividend and applies the correct treaty rate under a valid Form W-8BEN, the tax on that item is generally regarded as satisfied, and no return is required for it alone. Where withholding was applied at the wrong rate, or applied to something that should have been exempt, filing is the mechanism by which you recover the excess. That refund claim is itself a return, with its own statute of limitations.

There is a further, less publicised reason to file even when you doubt tax is due. Under the deductions rules applying to non-resident aliens, and the regulations under section 874, deductions and credits against effectively connected income are allowed only if a true and accurate return is filed on a timely basis. A late or missing return risks being taxed on gross rents or gross gain with no relief for mortgage interest, agents' fees, insurance, repairs or depreciation. That is the single most expensive mistake in this area.

Deadlines follow the source of your income. Where you received wages subject to US income tax withholding, the return is due on the ordinary spring deadline; where you did not, the due date falls two months later. An extension is available on Form 4868, but as with the UK self assessment regime, an extension of time to file is not an extension of time to pay. Interest and penalties run from the original due date on any unpaid balance.

• You own and let a US property, directly or through a US LLC treated as disregarded
• You hold an interest in a US partnership, private fund, or publicly traded partnership carrying on a US business
• You sold or exchanged US real property, or an interest in a US real property holding corporation
• You performed services physically in the United States and were paid for those days
• You suffered withholding at a rate higher than the treaty allows and want it back

How does the US decide whether you are a non-resident at all?

Before you consider what to report, confirm you are genuinely a non-resident. The United States taxes citizens and residents on worldwide income, and residence is determined by the green card test or the substantial presence test. The latter counts all qualifying days in the current year, one third of the prior year's days and one sixth of those from the year before, against a 183-day measure. Frequent transatlantic travel for board meetings and property inspections adds up faster than most people assume.

If you fail the day-count test but keep your tax home in the United Kingdom, the closer connection exception on Form 8840 may preserve non-resident status. Where the exception is unavailable, Article 4 of the US-UK double taxation convention provides a residence tiebreaker based on permanent home, centre of vital interests, habitual abode and nationality. A treaty tiebreaker claim is made by filing Form 1040-NR with Form 8833 attached, and it is a formal position, not an informal assertion to be settled later.

Former green card holders need particular care. Lawful permanent resident status continues for US tax purposes until it is formally abandoned, typically by filing Form I-407, or is administratively or judicially revoked. Simply moving to London and letting the card lapse in a drawer does not end US worldwide taxation. Where the card was held for a long enough period, ending residence may also trigger the expatriation regime under section 877A, with a mark-to-market charge and a Form 8854 exit statement.

What is the difference between FDAP income and effectively connected income?

The 1040-NR splits into two worlds, and understanding the split is the whole game. The first is fixed, determinable, annual or periodical income, universally shortened to FDAP. This covers dividends, most interest, rents in their default treatment, royalties and similar passive receipts. FDAP is taxed on gross at a flat statutory rate of 30 per cent, with no deductions of any kind, and the tax is normally collected by the payer as withholding agent. It is reported on Schedule NEC of the return, and evidenced by Forms 1042-S.

The second world is income effectively connected with a US trade or business. That income is taxed on a net basis at the graduated rates that apply to individuals generally, after allowable expenses. It is reported on the main pages of Form 1040-NR much as a US resident would report business or property income. For most UK investors, the arithmetic strongly favours the effectively connected treatment, because 30 per cent of gross rent is usually a great deal more than the graduated rates applied to a modest net profit.

The treaty is what reduces the statutory 30 per cent on the passive side. Article 10 of the US-UK convention limits source-state tax on portfolio dividends, commonly to 15 per cent for individual investors, while Articles 11 and 12 generally eliminate US tax on interest and royalties paid to UK residents. Entitlement depends on satisfying Article 23, the limitation on benefits article. The rates and conditions should be read in the current text of the convention and its technical explanation rather than taken from summary tables.

Domestic law also exempts a good deal that people wrongly expect to be taxed. Interest on ordinary US bank deposits paid to a non-resident alien is generally outside the charge, as is qualifying portfolio interest on registered debt. Conversely, capital gains on US shares realised by a non-resident are generally not US-taxable at all, unless the gain is effectively connected or you were physically present in the United States for a substantial part of the year. Real property is the great exception, dealt with below.

• FDAP: gross basis, flat rate, no deductions, collected by withholding, reported on Schedule NEC
• Effectively connected income: net basis, graduated rates, deductions allowed, reported on the main return
• Treaty relief reduces or removes the FDAP rate but does not change the character of the income
• Bank deposit interest and qualifying portfolio interest are commonly exempt under domestic US law
• Securities gains are usually outside the US net for a UK-resident non-resident alien

How is US rental income from an investment property taxed?

Left alone, rent from a US property is FDAP and suffers 30 per cent withholding on the gross rent. For a Manhattan or Miami apartment carrying a mortgage, service charges and property taxes, that can exceed the entire economic profit. The remedy is the net election under section 871(d), by which you elect to treat income from US real property as effectively connected. Article 6 of the US-UK convention contains a parallel elective mechanism. Once made, the election allows a full deduction of operating costs, interest and depreciation.

The election is made by attaching a statement to a timely filed return, listing the properties and your ownership interest. In the meantime, the tenant or managing agent is the withholding agent, and you stop their 30 per cent withholding by giving them a Form W-8ECI rather than a Form W-8BEN. A great many UK landlords discover the problem only when the first Form 1042-S arrives showing a large sum withheld and paid over to the IRS on their behalf.

Depreciation deserves separate attention because it is not optional. US rules require capital allowances on the building element to be taken over a fixed recovery period, and on a later sale the basis is reduced whether or not the deductions were actually claimed. The recovery periods differ for residential and commercial property and for property held by foreign owners, so check the current tables in IRS Publication 527. The UK gives no equivalent relief on residential buildings, so your two computations will diverge from year one.

What happens to FIRPTA withholding when you sell US real estate?

The Foreign Investment in Real Property Tax Act, codified principally at section 897, treats gain on the disposal of a United States real property interest as effectively connected income in the hands of a non-resident. Collection is secured by section 1445, which obliges the buyer to withhold a percentage of the gross amount realised, not of the gain, and to remit it using Forms 8288 and 8288-A. The general rate is 15 per cent, with reduced rates and exemptions for certain residences below stated price thresholds.

Withholding on gross proceeds is brutal where the property is heavily mortgaged or has fallen in value, because the cash withheld can exceed the entire tax liability and, occasionally, the entire equity released. The answer is to apply in advance for a withholding certificate on Form 8288-B, supported by a computation of the expected tax. Applications should be lodged no later than the closing date, and in practice well before it, since processing takes time and escrow arrangements have to be agreed with the buyer's attorney.

The withholding is a payment on account and nothing more. You still file a Form 1040-NR for the year of sale, compute the actual gain against your adjusted basis, apply the long-term capital gain rates where the holding period is met, and add back the depreciation element, which is taxed at a higher rate than the general capital gain rate. The amount withheld is credited, and any excess is refunded. Refunds are slow, particularly where an individual taxpayer identification number is being issued at the same time.

The definition of a United States real property interest goes well beyond a deed in your name. Shares in a US real property holding corporation are caught, as are interests in partnerships holding US real property. The IRS instructions to Form 8288 and the relevant chapter of the Internal Revenue Manual set out the tests. If you hold American property through a corporate or partnership blocker for privacy, liability or estate tax reasons, the FIRPTA analysis on exit should be modelled before you agree heads of terms.

• Withholding bites on the gross amount realised, not on the profit
• Form 8288-B can reduce or eliminate it, but must be filed by closing at the latest
• You need a US taxpayer identification number to make the application and to claim the refund
• Depreciation taken during ownership is recaptured on sale at a higher rate
• Blockers and partnership interests can themselves be United States real property interests

How are US partnership and private fund interests handled?

Investing in a US limited partnership, a private equity fund or a real estate fund is the most common way a UK investor acquires a US filing obligation without intending to. If the partnership carries on a US trade or business, its foreign partners are treated as carrying on that business too. The partnership withholds under section 1446 on the effectively connected income allocated to you, reports it on Forms 8804 and 8805, and issues a Schedule K-1. You then file to true up the position.

Publicly traded partnerships, familiar to investors as master limited partnerships in the energy and infrastructure sectors, deserve a specific warning. They generate effectively connected income that forces a return, and since the rules under section 1446(f) took effect, brokers must generally withhold on the gross proceeds when a foreign holder disposes of units. Many UK-resident investors bought these for the yield without appreciating that a modest holding creates an annual American compliance burden costing more than the distributions.

US-domiciled funds and exchange traded funds behave differently again. Ordinary dividends are FDAP and suffer withholding at the treaty rate, although designated capital gain dividends and certain interest-related dividends can be exempt in the hands of a non-resident. The greater problem is on the UK side. A US fund that has not obtained reporting fund status from HMRC produces an offshore income gain on disposal, taxed as income rather than capital, which frequently outweighs any US advantage. HMRC publishes the list of approved reporting funds.

What does Form W-8BEN actually do for you?

Form W-8BEN is the certificate an individual gives to a US withholding agent to establish foreign status and claim treaty benefits. Part I identifies you and your country of residence; Part II is where the treaty claim is made, citing the relevant article and the rate. Without a valid form on file, the withholding agent is obliged to presume US status or apply the full 30 per cent, and in some cases backup withholding. Entities use Form W-8BEN-E, which is materially more demanding.

A W-8BEN generally remains valid until the end of the third full calendar year after signature, unless circumstances change first. Moving house, changing your name after marriage or acquiring a US address all invalidate it. Brokers and transfer agents will simply revert to 30 per cent when the form expires, so a diary note is worth keeping. The IRS instructions to Form W-8BEN set out the validity period and the change-in-circumstances rules in detail.

Choosing the right form in the series matters as much as completing it. Form W-8ECI is used where the income is effectively connected and you want gross withholding stopped entirely. Form 8233 is used to claim a treaty exemption on compensation for personal services performed in the United States. Giving a payer a W-8BEN when the income is effectively connected, or an ECI form when it is not, creates a mismatch between the Forms 1042-S issued and the return you eventually file.

When do you need Form 8833 to claim a treaty benefit?

Section 6114 requires a taxpayer who takes a return position that a treaty overrules or modifies US internal law to disclose that position, and Form 8833 is the vehicle. The classic cases for a UK resident are a residence tiebreaker claim under Article 4, an exemption from US tax on employment income under the dependent personal services article, a claim that business profits are not attributable to a US permanent establishment, and reliance on the pension and social security articles.

Not every treaty benefit needs disclosure. Reduced withholding on dividends, interest and royalties claimed through a properly completed Form W-8BEN is generally exempted from the Form 8833 requirement by regulation. The distinction is between benefits obtained through the withholding system and positions asserted on a return. Where the answer is genuinely unclear, disclosure is the safer course, since the penalty for a missing disclosure is fixed and the cost of an unnecessary one is nil.

Form 8833 has to be substantive. A one-line assertion that the treaty applies is not a disclosure; the form asks for the article relied on, the nature and amount of the item, and an explanation of the position. Practitioner guidance from the Chartered Institute of Taxation and from the American Institute of CPAs consistently emphasises that thin disclosures attract examination. Attach the analysis you would want to show an IRS examiner three years later, when the file is cold and the adviser has moved on.

How are US work days taxed if you are employed in the UK?

Compensation for services performed physically within the United States is US-source income under section 861, regardless of where the employer sits, where the contract was signed or where the money is paid. A UK executive who spends thirty days a year in a New York office has US-source employment income on thirty days' worth of salary and, on ordinary principles, the corresponding proportion of bonus and share awards. The sourcing of equity compensation follows the workday pattern over the vesting period.

The employment income article of the US-UK convention provides relief where you are present for less than 183 days in the relevant twelve-month period, the remuneration is paid by or on behalf of a non-US employer, and the cost is not borne by a US permanent establishment. All three conditions must be met. Where a US group company is recharged for your time, the third condition frequently fails, and the exemption is lost even though the day count is comfortably within range.

Directors' fees are dealt with under their own article and follow different rules from ordinary employment income. Where relief is available, it is claimed at source using Form 8233 and confirmed on a return with Form 8833. Where it is not, a Form 1040-NR is required, state obligations may follow, and the UK will give credit under Article 24. Companies with mobile senior staff should track workdays contemporaneously rather than reconstructing them from expense claims and calendar entries.

What US estate tax exposure comes with US situs assets?

This is the exposure that most often surprises wealthy UK families, because it is entirely separate from income tax. A non-resident who is not a US citizen is subject to US federal estate tax on assets situated in the United States, and the exemption available under domestic law is very small indeed, commonly cited as $60,000 of US situs assets. Above that, tax is charged at rates reaching well into the forty per cent range, on the gross value of the American assets.

Situs is determined by specific rules, not by where the certificate or custodian sits. US real estate and tangible property physically in the United States are US situs. So are shares in a US corporation, wherever the shares are held and whoever the broker is, which is why a London-held portfolio of American technology shares is squarely exposed. Deposits in US banks and qualifying portfolio debt are generally treated as outside the estate. IRS Publication 559 and the instructions to Form 706-NA set out the framework.

The 1978 US-UK estate and gift tax convention, a separate treaty from the income tax convention, does substantial work here. It contains its own domicile tiebreaker and, importantly, allows a UK-domiciled decedent to claim a proportion of the much larger US unified credit, calculated by reference to the ratio of US situs assets to the worldwide estate. The interaction between that treaty and the UK's move to a residence-based inheritance tax framework is technical and should be reviewed with a specialist.

• Form 706-NA is generally due nine months after death, with extension available
• US brokers and transfer agents commonly require an IRS transfer certificate before releasing assets
• Gift tax for a non-domiciliary generally reaches US real estate and tangible property, but not US shares
• Non-US domiciled funds holding the same underlying US equities are usually not US situs
• Joint ownership and life policies each have their own situs and inclusion rules

Do US states follow the treaty?

Generally, no. The double taxation convention binds the federal government, and states are not parties to it. California is explicit that it does not conform to federal treaty provisions, and other states take similar positions. A UK resident whose employment income is exempt federally under the treaty may still face a state non-resident return and state tax on the same days. New York, California, Massachusetts and New Jersey are the jurisdictions that arise most often in practice for British executives and investors.

Property owners face state filing in the state where the property sits, on Form IT-203 in New York or Form 540NR in California, among others. Several states operate their own withholding on real property sales alongside FIRPTA, using forms such as New York's IT-2663 and California's Form 593. City-level taxes can apply on top, and some jurisdictions impose gross receipts or unincorporated business taxes on rental activity irrespective of profit.

State rules also diverge on residence. Some states apply statutory residence tests based on days present and the maintenance of a permanent place of abode, which can capture someone who keeps a Manhattan apartment for occasional use while living in London. Because no treaty tiebreaker is available, the only defences are factual: day counts, abode characteristics and documentary evidence. Keep travel records to a standard you would be content to produce in a state audit.

How does the UK side interact with your US filing?

As a UK resident you are, in principle, taxable on worldwide income and gains, so the same US rent, dividends and property gains fall into UK self assessment on the foreign pages, SA106 and SA108. Article 24 of the convention and the UK's unilateral relief rules give credit for US tax properly payable under the treaty, capped at the UK tax on the same income. Credit is given for the correct treaty rate, not for over-withholding you failed to reclaim.

Recent arrivers to the United Kingdom should check their position under the regime that replaced the remittance basis from April 2025, which provides time-limited relief on foreign income and gains for those with a sufficient period of prior non-residence. The rules, conditions and claim mechanics are set out in HMRC's guidance and in the residence, domicile and remittance basis manual, and they interact awkwardly with US-source income that is also taxed at source. Take advice before making or omitting a claim.

Two structural mismatches cause most of the friction. The tax years differ, the United States running to 31 December and the United Kingdom to 5 April, so credit has to be apportioned and timed with care. And the computations differ: the UK measures gains in sterling on both acquisition and disposal, so currency movement alone can create a UK gain where the dollar result was a loss. HMRC's Capital Gains Manual explains the sterling computation, and the effect on dollar-denominated property is often material.

What should you do next?

Start with an inventory. List every US-connected asset and income stream, identify who the withholding agent is for each, and collect the Forms 1042-S, 8805 and K-1 you have received over the last three years. Confirm that a valid Form W-8BEN or W-8ECI is lodged with each payer, and check the expiry dates. Most remediation work begins with the discovery that a form lapsed years ago and nobody noticed the rate change.

Then deal with identification and elections. If you do not hold an individual taxpayer identification number, begin the Form W-7 process early, because nothing else can be filed or refunded without one. If you own US property and have never made the net election, quantify what it would have saved and consider the position on prior years. If a sale is in prospect, model the FIRPTA outcome and the state withholding before contracts are exchanged.

Finally, look at the estate tax exposure separately from income tax, because it is the item most commonly missed and the most expensive to fix after the event. Reviewing the situs profile of a portfolio, and the availability of treaty credit, is a short exercise with a large payoff. Given how the US and UK systems interlock, this work is best done by a dual-qualified US-UK adviser who can model both returns together rather than two specialists working from opposite ends.

• Confirm your residence status under the substantial presence test and the treaty tiebreaker
• Refresh every Form W-8BEN and consider whether W-8ECI is the correct form instead
• Obtain an ITIN before any filing or refund claim becomes time-critical
• Model FIRPTA and state withholding well ahead of any US property disposal
• Review US situs assets against the estate and gift tax convention with a dual-qualified adviser

Related reading and tools

• US Tax Services & IRS Compliance
• UK Tax Services
• IRS Streamlined Filing
• UK Income Tax Calculator
• US Federal Income Tax Calculator

Every situation is different. Book a cross-border tax consultation to discuss how these rules apply to you.

Authoritative sources

IRS — Streamlined Filing Compliance Procedures

FinCEN — Report of Foreign Bank and Financial Accounts (FBAR)

HM Revenue & Customs

GOV.UK — Tax on foreign income

IRS — Foreign Earned Income Exclusion

IRS — Foreign Tax Credit

ICAEW

Chartered Institute of Taxation (CIOT)

AICPA

MoneyHelper (UK)