Introduction Your US company hired Sarah in Boston eighteen months ago. She moved to London last year to be closer to her partner and was asked to keep working remotely. You agreed. Now that your HR director has discovered the company has been paying a US payroll for someone who is tax resident in the […]
Your US company hired Sarah in Boston eighteen months ago. She moved to London last year to be closer to her partner and was asked to keep working remotely. You agreed. Now that your HR director has discovered the company has been paying a US payroll for someone who is tax resident in the UK for 14 months, your finance team is worried about Permanent Establishments. Your external accountant has mentioned PAYE and Class 1 National Insurance.
This guide is written for US employers with American employees working remotely from the UK, US-based HR and payroll teams, and the employees themselves. By the end, you will know exactly when the employment tax US employees face in the UK remote-work framework triggers UK PAYE, when the US-UK treaty provides relief, when a UK Permanent Establishment arises, and how to structure the arrangement compliantly. For a broader planning context, see our service page at https://www.jungletax.co.uk/services/.
Employment tax for US employees working remotely in the UK refers to the combined UK and US tax obligations for a US citizen who is a US resident, or a US-resident employee physically working from the United Kingdom for a US employer. The framework spans four areas: UK income tax via PAYE, UK National Insurance, US federal income tax and FICA, and the potential creation of a UK Permanent Establishment exposing the US employer to UK Corporation Tax.
The trigger is physical presence, not contract location. Once a US employee becomes a UK tax resident under the UK Statutory Residence Test, typically 183 or more days in the UK tax year, or fewer days combined with UK ties, HMRC has primary taxing rights on their UK workdays’ employment income. The employer’s obligations follow almost immediately, often within 30 days of the employee’s UK start date. The full HMRC test guidance sits at https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt.
This matters in 2026 because HMRC has increased focus on remote-worker compliance, the post-Brexit landscape removed EU social security shortcuts, and the rise in hybrid and digital nomad arrangements has dramatically expanded the number of US workers physically based in the UK.
Three concrete drivers make this an urgent compliance area for 2026.
The first is HMRC enforcement focus. HMRC’s nudge letters have increasingly targeted UK-resident employees of overseas employers without UK PAYE in place. In addition to HMRC late payment interest, penalties for not operating PAYE begin at 30% of the underpaid tax for negligent behavior and increase to 100% for intentional concealment. rate of around 7.75%. Current rates are published at https://www.gov.uk/government/publications/rates-and-allowances-hmrc-interest-rates-for-late-and-early-payments.
The second is the new Foreign Income and Gains regime that replaced the non-dom remittance basis from 6 April 2025. The FIG regime offers a four-year UK tax exemption for new UK residents on foreign income, including continued US-source employment income, but only with careful planning under Articles 4 and 14 of the US-UK Income Tax Treaty. The full treaty text sits at https://home.treasury.gov/policy-issues/tax-policy/international-tax. Getting the structure right in year one is decisive for the employee’s net position.
The third is the post-Brexit Totalization rules. The US-UK Totalization Agreement remains in force and allows eligible employees to stay in their home social security system via a Certificate of Coverage. Still, the mechanics are now stricter than during the EU period and require active employer action. The official Social Security Administration overview is at https://www.ssa.gov/international/agreements_overview.html.
The moment a US employee becomes a UK tax resident and performs duties physically in the UK, the US employer becomes subject to a UK PAYE obligation under HMRC’s PAYE rules for employers, set out at https://www.gov.uk/guidance/paye-and-payroll-for-employers. The US employer must register as a UK employer with HMRC, operate UK payroll, deduct UK income tax at the relevant rates, and pay Class 1 employer National Insurance at 15% from April 2025 on earnings above the secondary threshold of £ 5,000 per year.
For US companies with no other UK presence, there are two main routes. The first is a Direct PAYE Scheme, where the US employer registers and operates UK payroll directly. The second is an Employer of Record arrangement, where a UK entity formally employs the worker on the US company’s behalf. Each route carries different costs, control, and Permanent Establishment implications and should be chosen with full advice rather than convenience.
A UK Permanent Establishment is a fixed place of business in the UK through which a US enterprise carries on its business. Under Article 5 of the US-UK Treaty, a remote worker can create a Permanent Establishment in two ways. The first is by maintaining a fixed base in the UK, typically a dedicated home office where they regularly perform their duties. The second is by acting as a dependent agent, regularly concluding contracts in the UK on behalf of the US employer.
Once a Permanent Establishment exists, the US employer becomes liable for UK Corporation Tax at twenty-five percent on profits attributable to UK activities, must file a UK Corporation Tax return, and may face transfer pricing obligations. Permanent Establishment risk is the single largest exposure created by remote US workers in the UK, and the issue HMRC focuses on most in compliance reviews.
The Totalization Agreement prevents double social security taxation. Under the agreement, an employee posted from the US to the UK for up to five years can remain in the US Social Security and Medicare system by obtaining a Certificate of Coverage from the US Social Security Administration. The Certificate exempts both the employer and the employee from UK Class 1 National Insurance for the covered period, thereby materially reducing the total cost.
The Certificate must be applied for proactively, ideally before the employee’s UK start date. Retrospective applications are possible but face delays and are sometimes refused for arrangements that have been in place for many months without action.
The employee remains liable for US federal income tax on their worldwide income because the United States taxes on citizenship. UK income tax paid on UK workdays is creditable against US tax via Form 1116 Foreign Tax Credit. The Foreign Earned Income Exclusion on Form 2555 is available to employees who meet the physical presence or bona fide residence test. Still, the Foreign Tax Credit is usually the better long-term election for UK earners because UK rates exceed US rates and produce useful carryforwards.
The first step is to confirm the employee’s UK tax residence status under the Statutory Residence Test, taking into account expected UK days, family ties, accommodation, and prior UK history. Genuine short-term assignments under 183 days may qualify for full treaty relief under Article 14 of the US-UK Treaty.
The second step is to assess Permanent Establishment risk based on the employee’s role, duties, and home working arrangements. If they regularly enter into contracts, hold a sales role, or run a permanent home office, mitigations need to be put in place before the employee starts UK work, not afterward.
The third step is to apply for a Certificate of Coverage from the US Social Security Administration before the UK start date. Form 8802 supports the request. The Certificate keeps the employee in US Social Security and Medicare for up to five years and removes the UK National Insurance burden during that period.
The fourth step is to choose between the Direct PAYE Scheme, Employer of Record, or a UK subsidiary, based on headcount, cost, control, and PE risk profile. For one or two remote workers, EOR is often the cleanest route; for larger UK headcounts or strategic UK plans, a UK subsidiary is preferable.
The fifth step is to set up UK payroll with monthly Real Time Information submissions to HMRC, accurate application of UK tax codes, pension auto-enrolment under the Pensions Act 2008, and employer National Insurance handling. HMRC guidance is at https://www.gov.uk/paye-online.
The sixth step is to coordinate US payroll, ensuring continued FICA collection if the Certificate of Coverage applies, optimizing US federal income tax withholding, and establishing a clear US-UK tax equalization policy if the employer covers cross-border tax costs.
A US software company employed a senior backend engineer in Austin. In early 2025, she moved to London with her UK partner and continued working remotely on US time, accessing US client systems and reporting to a US line manager. The company kept her on the US payroll for 15 months before their external accountant flagged the issue.
Jungle Tax was engaged in early 2026. The position we identified ran across all four risk areas. The employee became a UK tax resident on the date of her arrival in London under the Statutory Residence Test. UK PAYE had been owed from week one and never operated. No Certificate of Coverage had been obtained, so UK Class 1 National Insurance was technically due alongside US FICA, which had already been deducted. The employee’s London home office created realistic Permanent Establishment exposure because she was the only person performing the company’s core engineering work from the UK premises.
The remediation route used a UK Employer of Record to assume the formal employment relationship going forward, removing the immediate PE pressure point. A Certificate of Coverage was obtained retrospectively for the covered period and prospectively for the next five years. Back PAYE and employee National Insurance were settled via a voluntary disclosure to HMRC, securing reduced penalty rates under the unprompted disclosure framework. The employee filed a UK Self-Assessment to claim Foreign Tax Credit relief on the US tax already paid for the period, avoiding double taxation under Article 24 of the treaty.
The outcome was full UK and US compliance, a defensible PE position going forward, an estimated saving of around £ 45,000 in penalty exposure compared with an HMRC-initiated inquiry, and a clean cross-border employment structure for ongoing business.
The PAYE scheme must be registered with HMRC before the first UK payday, and ideally within 30 days of the employee’s UK start date. Monthly Real Time Information submissions are due on or before each payday. PAYE and National Insurance must be paid to HMRC by the 22nd of the following month if paying electronically, or the 19th if paying by post. The annual P60 must be issued to each UK employee by 31 May 2026 for the 2025-26 tax year, and forms P11D for any benefits in kind must be filed by 6 July 2026. Pension auto-enrolment duties apply from the employee’s first day of UK work for eligible jobholders.
For Permanent Establishment, the UK Corporation Tax return is due 12 months after the accounting period end, with Corporation Tax payable nine months and one day after the period end for non-large companies. Current employer guidance is published at https://www.gov.uk/business-tax/paye.
Failure to operate UK PAYE attracts penalties of 30% of the unpaid tax for careless behavior, 50% for deliberate but not concealed behavior, and 100% for deliberate and concealed behavior, plus interest at the HMRC late payment rate—National Insurance penalties run in parallel under similar bands. Late filing of Real Time Information submissions attracts fixed monthly penalties scaling with employer size, with daily penalties for prolonged failure.
If HMRC and Corporation Tax identify that a Permanent Establishment was not paid, the standard penalty regime applies to the unpaid Corporation Tax with the same thirty to one hundred percent bands, plus interest. In serious or deliberate cases, HMRC can publish details of deliberate defaulters. The penalty framework is summarised at https://www.gov.uk/government/publications/compliance-checks-penalties-for-inaccuracies-in-returns-and-documents-ccfs7a.
A voluntary, unprompted disclosure to HMRC before any enforcement action typically reduces penalties to the lower end of each band, sometimes to zero for genuine error, which is why early engagement with a specialist is the highest-value action available.
The first mistake is treating a US employee in the UK as if nothing changed because they kept their US contract. UK PAYE liability arises from physical presence, regardless of contract location, and the US contract gives no UK shield.
The second mistake is assuming the treaty automatically exempts the UK from tax for short stays. Article 14 dependent-services relief requires the employee to be present in the UK for fewer than 183 days, the remuneration to be paid by a non-UK-resident employer, and the cost not to be borne by a UK Permanent Establishment, all three conditions to be met simultaneously. Failing any one triggers UK liability.
The third mistake is failing to obtain a Certificate of Coverage and assuming the employee can continue paying US FICA without incurring UK National Insurance consequences. Without the Certificate, both apply.
The fourth mistake is dismissing Permanent Establishment risk as a niche concern when the remote worker is a senior employee with contracting authority or a single fixed UK workplace.
The fifth mistake is operating an informal arrangement without a written remote-work policy, tax equalization agreement, or HR documentation. When HMRC asks for evidence of intent and structure, the absence of paperwork weighs against the employer in the penalty assessment.
The sixth mistake is delaying engagement with a US-UK specialist until the HMRC contact arrives. Voluntary disclosure routinely reduces penalty exposure by tens of thousands compared with reactive remediation.
The three main structures used in practice are compared side by side.
Route — Direct PAYE Scheme
How it works: A US employer registers with HMRC and operates a UK payroll directly without forming a UK entity.
Cost and control: Lower setup cost. Full control over the employment relationship is retained. Ongoing UK payroll administration cost is modest.
Permanent Establishment risk: Moderate. The employee’s UK home office and duties continue to drive the PE analysis of the role’s facts.
Best for: One or two short- to medium-term remote workers for whom the US employer prefers to retain the direct employment relationship.
Route — Employer of Record (EOR)
How it works: A UK third-party EOR provider formally employs the worker and invoices the US company for the employee’s cost plus a service margin.
Cost and control: Higher monthly cost, typically a percentage uplift of ten to fifteen percent on gross salary. Day-to-day control of the worker stays with the US company. Employment relationship sits with the EOR.
Permanent Establishment risk: Lower. The EOR structure helps but does not eliminate PE risk; HMRC examines economic substance and role authority.
Best for: US companies with one to five UK remote workers who want a fast, low-administration route and reduced PE exposure.
Route — UK Subsidiary
How it works: A US parent forms a UK limited company, which employs the worker and bills the US parent for services under transfer pricing rules.
Cost and control: Highest setup and ongoing cost: Companies House registration, UK accounts, Corporation Tax filing, transfer pricing documentation. Full control retained.
Permanent Establishment risk: Lowest from a PE perspective because the UK subsidiary itself is the UK taxpayer, but full UK Corporation Tax compliance applies to the subsidiary.
Best for: US companies with 5+ UK headcount, strategic UK plans, or sales activity in the UK that requires substance.
The US-UK Income Tax Treaty controls how taxing rights are split between the two countries. Article 14 governs income from employment and is the main provision for remote workers. It gives the country of physical performance — the UK, for a London-based remote worker — primary taxing rights, with three narrow exceptions for short-term assignments of fewer than 183 days. Article 5 defines Permanent Establishment and is the basis for assessing employer-level UK Corporation Tax exposure. Article 24 provides credit relief, preventing double taxation by allowing UK tax paid to be credited against US federal tax via Form 1116, and vice versa, where US tax is paid first.
The treaty’s saving clause in Article 1(4) preserves the US right to tax its citizens regardless of residence, which is why the US-citizen employee must continue filing Form 1040 every year while in the UK. UK Self Assessment is filed in parallel, and Foreign Tax Credit reconciles the two. The full treaty text and protocols are available at https://home.treasury.gov/policy-issues/tax-policy/international-tax.
For employees considering renouncing US citizenship to simplify long-term life in the UK, Form 8854 requires five years of full US tax compliance, and an unprepared exit can trigger covered expatriation under Internal Revenue Code Section 877A, with substantial exit tax consequences.
Jungle Tax is a UK firm of Chartered Tax Advisers specializing in US-UK cross-border taxation. Our team brings combined UK ATT and CIOT qualifications, as well as US IRS Enrolled Agent and CPA credentials, which means we can advise both sides of the relationship in a single conversation rather than routing you between two firms.
For US employers, we structure UK remote-worker arrangements, register Direct PAYE Schemes, coordinate Employer of Record relationships, manage Permanent Establishment risk reviews, and run UK Corporation Tax compliance where a PE or subsidiary exists. For US employees, we file Form 1040 with optimized Form 1116 and Form 2555 elections, draft Form 8833 treaty disclosures, prepare UK Self Assessment, and apply for Certificates of Coverage through the US Social Security Administration. Where compliance has slipped, we use IRS Streamlined Filing Procedures and HMRC unprompted disclosures to bring both parties up to date with minimal penalty exposure.
For a free initial cross-border assessment, contact us at info@jungletax.co.uk or visit https://www.jungletax.co.uk. You can also see related guidance on our news page at https://www.jungletax.co.uk/jungle-tax-news-updates/.
Three takeaways matter most for US employers and US employees navigating the employment tax in the US and the remote UK framework. First, physical presence triggers UK tax obligations regardless of contract location, and PAYE registration is often required within thirty days of the employee’s UK start date. Second, Permanent Establishment risk is the largest hidden exposure and is best managed by structural choice — Direct PAYE Scheme, Employer of Record, or UK subsidiary — made before the arrangement begins, not after. Third, the US-UK Treaty and Totalization Agreement together provide meaningful relief, but only when claimed proactively through correct elections and a timely Certificate of Coverage. Speak to a Jungle Tax adviser today by emailing info@jungletax.co.uk or visiting https://www.jungletax.co.uk/services/
Yes, in almost every case. Once the employee is a UK tax resident and performing duties physically in the UK, the US employer carries a UK PAYE obligation regardless of the size of the UK operations. Registration is normally required within 30 days of the UK start date, and HMRC penalties for non-registration start at 30% of unpaid tax.
Only under Article 14 dependent-services relief, which requires all three of these conditions: fewer than 183 days in the UK in twelve months, remuneration paid by a non-UK-resident employer, and the cost not borne by a UK Permanent Establishment. Failing any one condition triggers UK income tax liability on UK workdays.
A Certificate of Coverage issued under the US-UK Totalization Agreement allows the employee to remain in the US Social Security and Medicare system for up to five years while working in the UK, exempting both employer and employee from UK National Insurance. Without it, both Social Security regimes apply simultaneously, materially increasing total payroll cost.
It can. A fixed home office regularly used to perform the employer’s core business activities, particularly where the employee has contracting authority or senior responsibility, may constitute a Permanent Establishment under Article 5 of the US-UK Treaty. This exposes the US employer to UK Corporation Tax on attributable profits. A structured Employer of Record or UK subsidiary arrangement reduces this risk.
Potentially yes, for the first four years of UK residence. The FIG regime can exempt qualifying new arrivals’ foreign income from UK tax during that period. Still, the interaction with US-source employment income and the US-UK Treaty requires careful structuring under Articles 4 and 14. Year-one planning is critical to lock in the benefit.
