IR35 Status Determination: US Tax Impact for UK PSCs

An IR35 status determination decides whether fees paid to your personal service company are taxed as employment income. Inside the rules, PAYE and National Insurance attach to the engagement, the company's profit collapses, and your US return suddenly sees a foreign corporation whose numbers no longer match the tax you actually paid.

That last point is where most senior US-connected consultants in Britain come unstuck. The UK consequences of a determination are well documented. What almost no published guidance addresses is the second-order effect: once HMRC treats the fee as your employment income while the Internal Revenue Service still treats the same money as receipts of a UK company you control, the two returns stop describing the same transaction. Form 5471 reports one story, Form 1116 reports another, and the foreign tax credit that should neutralise the UK tax can strand instead.

This guide is about getting the reporting right after a determination has been made. It is not about engineering an engagement to sit outside the rules. Once the status determination statement lands, the question is no longer whether you are inside; it is how both returns should now be prepared, and what has to be corrected if earlier years were filed on the old assumption.

What does an IR35 status determination actually decide?

The off-payroll working rules ask a single hypothetical question: if the worker had contracted directly with the client, rather than through an intermediary, would that relationship have been one of employment? The intermediary is usually the worker's own limited company — a personal service company, or PSC — but it can also be a partnership or another individual. HMRC's overview of the regime sits at GOV.UK's off-payroll working guidance.

The determination itself turns on the familiar status factors: personal service and the right of substitution, mutuality of obligation, and the degree of control the client exercises over what, how, when and where the work is done. Secondary factors — financial risk, provision of equipment, integration into the client's organisation, whether you are in business on your own account — colour the picture. For a senior interim executive embedded in a client's leadership team for eighteen months, the honest answer is frequently "inside", and increasingly clients reach that conclusion defensively rather than analytically.

What matters for your filings is not the philosophy of status but its mechanics: who made the call, and which chapter of the legislation therefore applies. Those two answers determine whether tax is deducted at source by somebody else or calculated by your own company, and that in turn determines what your US return has to report.

Who makes the determination: client-led rules versus the small-client exemption

Medium and large clients, and all public authorities

Where the end client is a public authority or a medium or large-sized non-public sector organisation, the client must decide status and issue a status determination statement (SDS). The SDS must state the conclusion and the reasons for it, and must be passed to the worker and to the next party down the contractual chain. HMRC's client-facing guidance also sets out the client-led disagreement process: you may challenge the determination up to the final payment for your services, and the client has 45 days to respond in writing, either confirming or replacing its conclusion. If the client misses that window, responsibility for the income tax and National Insurance passes to it.

This is Chapter 10 of ITEPA 2003. Where the determination is "inside", the fee-payer — the party that pays your PSC, whether that is the client itself or an agency — becomes the deemed employer. It operates PAYE on the payment to your company, deducts income tax and employee National Insurance, and pays employer National Insurance and, where applicable, the Apprenticeship Levy on top. Your company receives the balance.

Small clients: the exemption that leaves the PSC deciding

Small non-public sector clients are outside the client-led regime entirely. They do not have to assess status or issue an SDS, although they must confirm their size if you ask. Responsibility for applying the legislation reverts to your own company under Chapter 8 of ITEPA 2003 — the original intermediaries legislation. The same is true where the end client is wholly overseas, with no UK residence and no UK permanent establishment, which is a common pattern for US-connected consultants invoicing a New York or San Francisco parent for work performed in Britain.

Size is tested against the Companies Act criteria. A company is small where it does not exceed at least two of three thresholds; unincorporated clients are tested on turnover alone. Crucially, a client must generally fail or meet the tests across two consecutive financial years before its off-payroll obligations switch on or off, and the year that counts is the last financial year whose accounts filing period ended before the start of the tax year in question.

Have the small-client thresholds changed?

Yes — but far more slowly than the headlines suggest, and this is where most commentary is currently wrong. The Companies Act size thresholds were uprated so that the small-company turnover limit rises from £10.2 million to £15 million and the balance sheet total from £5.1 million to £7.5 million, with the 50-employee test unchanged. HMRC's own manual page, ESM10006A, confirms the uprated figures apply to financial years beginning on or after 6 April 2025, and — because of the accounts-filing lag and the two-consecutive-year rule — states that the earliest tax year in which the new thresholds can actually change a client's off-payroll obligations is 2027/28.

The practical consequence for a determination you receive now is blunt: for the current tax year most clients are still being sized against the older £10.2 million and £5.1 million limits. Do not assume a client that has just crept past £11 million of turnover has become small. Ask for its written size confirmation and keep it with the engagement file, because that single document decides which chapter governs your company's accounts and, downstream, what your Form 5471 has to show.

Feature	Chapter 10 — client-led (medium/large or public client)	Chapter 8 — small or wholly overseas client
Who determines status	The end client, via a status determination statement	Your own PSC, on its own analysis
Who operates PAYE	The fee-payer / deemed employer, at source	The PSC itself, through a deemed employment payment
Employer NIC borne by	The deemed employer	The PSC, out of engagement income
5% administrative allowance	Not available	Available in the deemed payment computation
What the PSC receives	Fee net of income tax and employee NIC	Gross fee; tax computed and paid by the company
Corporation tax profile	Little or no taxable profit on the engagement	Deduction for the deemed payment and secondary NIC
Effect on the US return	Corporation shows compressed receipts; UK tax sits with the individual	Corporation shows gross receipts and a large deduction

What does a deemed employment payment do to the company's profits?

Under Chapter 8, your company calculates a deemed employment payment at the end of the tax year. In outline, the computation starts with all payments received in respect of relevant engagements, reduces that figure by a flat 5% administrative allowance, subtracts certain allowable expenses, any pension contributions and any salary already paid, and then works backwards to strip out the employer National Insurance embedded in the remainder. What is left is treated as employment income of the worker on 5 April, with PAYE and Class 1 National Insurance due accordingly.

The company then gets relief. HMRC's Business Income Manual at BIM47225 confirms that tax relief is available for the amount of the deemed employment payment and the secondary NIC due on it. So the accounting picture is: gross turnover in, a very large staff-cost deduction out, and a corporation tax profit close to nil.

Under Chapter 10 the arithmetic never happens inside your company at all. Tax has already been taken before the money arrives. The 5% allowance is not available. The amount your company receives has already borne income tax and employee NIC, and it can be paid out to you without a second charge — the legislation prevents the same money being taxed twice on its way through. But your company's recorded turnover, its cash flows and its distributable reserves all look materially different from a year in which the same engagement was treated as outside.

PAYE offsets: the change that stopped double taxation on retrospective determinations

Where HMRC successfully challenges an "outside" determination after the fact, the deemed employer historically faced a PAYE bill computed on the gross fee, with no credit for the corporation tax, dividend tax and self-assessment tax the PSC and its owner had already paid on the same income. Since April 2024 HMRC can set off those taxes already paid against the deemed employer's liability. For a US-connected worker this matters twice over: the offset changes the UK number, and any UK tax refunded or re-characterised as a result has to be traced through your foreign tax credit position for every affected US year — a credit you claimed on a tax that is later repaid triggers a redetermination obligation.

What changes on your UK self assessment return?

Inside Chapter 10, the deemed direct payment appears as employment income. You report it on the employment pages, with the tax deducted by the fee-payer credited against your liability. Two practical traps recur. First, student and postgraduate loan repayments are not deducted by a deemed employer, so they fall due through self assessment and surprise people in January. Second, if you are additional-rate or close to it, PAYE operated by a fee-payer who does not know about your other income will under-deduct, and the balance arrives as a self-assessment payment plus payments on account.

Inside Chapter 8, the deemed employment payment is reported through your company's payroll and then on your return in the same way. Dividends you had planned to take are no longer available in the same volume, because the profit they would have come from has been converted into salary-equivalent income.

The cross-border sting: what your US return sees

Here is the heart of the matter, and the part every generalist page on this topic omits. The United States does not recognise the deemed employment payment or the deemed direct payment. It applies its own rules to the same facts, and those rules see a US person who owns a foreign corporation.

The earner mismatch

For UK purposes, a determination of "inside" moves the income from the company to you. For US purposes — absent an entity classification election — the UK limited company remains a corporation, and money it receives is its income, not yours. You have income only when the company pays you salary or a dividend, or when an anti-deferral rule attributes income to you.

So in a Chapter 10 year you can end up in the following position: HMRC has taxed you personally on £300,000 of deemed employment income and collected income tax and NIC at source, while the IRS sees a foreign corporation that received a net figure and a shareholder who, on a literal reading, received rather less. The UK tax was paid by or on behalf of you. The income the IRS attributes may sit with the company. Tax and income have separated, and the foreign tax credit rules are unforgiving about that separation.

Form 5471: why a status change disturbs the reporting

If you own or control the UK PSC you will already be filing Form 5471, typically as a Category 4 filer (control) and a Category 5 filer (US shareholder of a controlled foreign corporation). The form is not merely a disclosure; its schedules carry the corporation's income statement, balance sheet, earnings and profits, previously taxed items and shareholder transactions.

A status determination moves every one of those numbers:

• Schedule C. Under Chapter 10 the company's recorded receipts and its cost base both change. Under Chapter 8 the company shows gross receipts and a very large compensation deduction. Same engagement, two entirely different income statements.
• Earnings and profits. A near-nil profit year means little or no current E&P, which changes what a subsequent distribution actually is for US purposes — a dividend, a return of capital, or a distribution of previously taxed earnings.
• Schedule I-1 and the GILTI computation. Tested income falls, often to nil. If you have been running a section 962 election strategy or absorbing a GILTI inclusion each year, the pattern breaks — and elections made on the assumption of continuing tested income need to be revisited. Our guide to GILTI and the section 962 election for US founders of UK companies covers that interaction in depth.
• Schedule M and Schedule P. Payments between you and the company, and previously taxed earnings and profits by shareholder, both move when salary replaces dividends.
• Category and schedule scope. A determination does not usually change which categories you fall into, but a mid-year restructuring prompted by one — closing the PSC, adding a shareholder, moving to an umbrella arrangement — very often does. The penalty regime for a missed or incomplete Form 5471 is severe and information-based, not tax-based; see our detailed guide to Form 5471 categories and penalties for US owners of UK limited companies.

The foreign tax credit problem

The UK income tax borne on a deemed employment payment is a creditable income tax; the National Insurance is not. Employee and employer NIC are social security contributions, and where you are covered by UK National Insurance under the US–UK totalization agreement you are relieved from US self-employment tax rather than given a credit. Treating NIC as creditable is one of the most common errors we see on returns prepared without cross-border review, and it inflates the credit claimed on Form 1116 in a way that does not survive examination.

The deeper issue is matching. A credit is allowed against US tax on the same income, in the same category, in the same year. Where UK tax attaches to you personally in year one but the corresponding US income only reaches you as a distribution in year two, the credit and the income fall in different periods. Excess credits carry back one year and forward ten, but a carryforward with nothing to absorb it is a deferred asset that frequently expires unused. Meanwhile the character of the income matters: personal services income sits in the general limitation category, while a dividend from your own PSC may be passive category income — and credits cannot cross baskets.

Entity classification: aligning who the earner is

Because a UK private limited company is an eligible entity, a US owner may elect on Form 8832 to treat it as a disregarded entity or partnership for US purposes. Where that election is in place, the mismatch largely disappears: the company's income is your income, the UK tax and the US income land on the same person in the same year, and the foreign tax credit works as intended. Form 5471 is replaced by Form 8858 reporting.

This is a reporting alignment decision with permanent consequences — it affects the treatment of any future sale of the business, the availability of deferral, and the five-year restriction on changing classification again. It is not a lever to pull reflexively after a single status determination, and it interacts with UK corporation tax, which continues to treat the company as opaque regardless of what you elect in Washington. It belongs in a properly modelled review, not in a year-end scramble.

Question	UK / HMRC treatment	US / IRS treatment
Who earns the engagement fee?	The worker, once the rules apply (deemed employment income)	The company, unless an entity classification election says otherwise
Is the PSC transparent?	No — always opaque for corporation tax	Optionally — eligible entity may elect disregarded status
Where is the income reported?	Employment pages of the self assessment return	Form 5471 for the company; Form 1040 only on actual payment or inclusion
Income tax on the deemed payment	Collected via PAYE at source or by the PSC	Potentially creditable on Form 1116, general category
National Insurance / social security	Class 1 employee and employer contributions due	Not creditable; totalization agreement governs coverage
Effect of a near-nil corporate profit	Minimal corporation tax	Reduced tested income and E&P; changed character of later distributions

What if a determination changes mid-engagement or applies retrospectively?

Status determinations are not always clean and prospective. Clients revisit them at contract renewal, on a change of role, or after an internal audit. A revised SDS can move an engagement from outside to inside part-way through a UK tax year, and the client-led disagreement process can move it back. Each movement splits the year into two economic regimes, and the US return has to reflect the split rather than the year-end position.

The reporting sequence we use is deliberately mechanical:

• Fix the UK facts first. Obtain the SDS, the reasons, the client's size confirmation and the effective date. Reconcile the fee-payer's payroll records to the company's bank receipts, invoice by invoice.
• Rebuild the company's accounts on the correct basis. Chapter 10 and Chapter 8 produce materially different statutory accounts. Get this right before touching anything American, because Form 5471 is fed by the accounts.
• Restate the functional currency figures. Translate the corporation's results using the appropriate average rate, and translate the UK taxes at the rate applicable when paid. Currency slippage between the two exercises is a routine source of misstated credits.
• Re-run the anti-deferral computations. Tested income, subpart F, previously taxed E&P and any section 962 election all follow from the restated accounts.
• Rebuild the foreign tax credit by basket and by year. Strip out National Insurance. Identify credits with no matching income, and decide whether a carryback is worth claiming.
• Check the information returns. The PSC's business bank account is a foreign financial account; where you own more than half the company, it is reportable on the FBAR, and the shares themselves may be a specified foreign financial asset on Form 8938.

What if earlier years were filed on the wrong assumption?

This is how most of these engagements reach us. A consultant filed several years on the basis that the PSC's profits were the company's, took modest salary and generous dividends, and claimed foreign tax credits accordingly. A determination then arrives — or an HMRC enquiry lands — and the earlier years are shown to have been inside the rules all along. The UK exposure is one problem. The US exposure is a separate one, and it is usually worse, because Form 5471 penalties are assessed per form per year and do not depend on any tax being due.

Where US returns or information forms were never filed at all, or were filed without the required international schedules, the streamlined procedures may be available to bring everything current with penalty relief, provided the failures were non-wilful. We set out how that works, and what makes a certification defensible, in our guide to IRS streamlined filing, and our companion piece on US tax return preparation for expats with unfiled years deals with the self-employment tax and totalization questions that sit alongside it.

The order of operations matters. Correcting the UK position first, then rebuilding the US filings from restated accounts, is almost always cheaper and more defensible than filing amended US returns against numbers that are about to change again.

A reporting checklist for the year a determination lands

• Written SDS with reasons, plus the client's confirmation of its size for the relevant financial year.
• Fee-payer payroll reports reconciled to company receipts, showing income tax and NIC deducted.
• Statutory accounts prepared on the correct chapter basis, with the deemed payment and secondary NIC treated consistently.
• Self assessment return reflecting employment income and credit for tax deducted, with loan repayments allowed for.
• Form 5471 with all required schedules, restated E&P, and a note of any change in tested income.
• Form 1116 by basket, with National Insurance excluded and carryovers documented.
• FBAR and Form 8938 covering the company account and the shareholding.
• A documented file note explaining the treatment — the single most useful thing you can have if either revenue authority asks in three years' time.

How Jungle Tax approaches these engagements

Jungle Tax prepares both returns for senior consultants, interim executives and founders who hold US citizenship or a green card and work in Britain through their own company. We are tax preparation specialists: our work is producing filings that are accurate, internally consistent and defensible on both sides of the Atlantic, once the commercial facts are settled. That means reconciling the UK payroll position to the US corporate reporting, computing credits that survive scrutiny, and closing off historic years cleanly. You can read more about how we combine both disciplines on our US–UK tax accountants page and our cross-border service, or browse the rest of our technical guides.

If a status determination has landed on your desk and you are unsure what it does to your Form 5471, your foreign tax credit, or years already filed, contact our cross-border team for a confidential consultation. We will review the determination, the company's accounts and your filing history together, and tell you plainly what needs correcting and in what order.