A UK permanent establishment exists the moment your business has a fixed place here, or a dependent agent habitually concluding contracts on your behalf. If either applies, CTA 2010’s PE provisions bring the profits attributable to that presence into UK corporation tax, regardless of where your company is incorporated. What follows sets out the tests, the exceptions, and what to do about it.
TL;DR:
- A UK permanent establishment is created when a business has a fixed place of business or a dependent agent habitually concluding contracts locally.
- Typical fixed places include UK offices, warehouses, home offices for key personnel, or UK servers used for core business functions.
- An agent habitually concluding contracts in the company’s name or playing a principal role in contract formation can establish a dependent agent PE.
- Certain preparatory or auxiliary activities, such as storage or purchasing, do not create a PE unless combined with other activities forming a continuous business operation.
- Once a PE exists, profits are taxed based on OECD arm’s-length principles, requiring detailed records, transfer pricing compliance, and timely registration with HMRC.
CTA 2010, from Section 1141 onwards, defines a permanent establishment (PE) around two scenarios: a fixed place of business through which the company’s activities are wholly or partly carried on, or a dependent agent acting on the company’s behalf in the UK. This domestic definition tracks Article 5 of the OECD and UN model tax treaties fairly closely, though the wording isn’t identical, and where the UK has a double taxation treaty with your home jurisdiction, that treaty’s Article 5 wording typically takes precedence over the plain domestic rule.
That matters practically. The OECD/UN model commentary shapes how HMRC and courts interpret ambiguous cases, including construction-site duration thresholds and what counts as habitual contract conclusion.
The fixed-place test has two working parts: a location with a genuine degree of permanence, and business activity actually carried on through it. Permanence doesn’t mean owning a building. A rented desk used consistently over months, a warehouse holding stock for UK customers, or a director working from a UK home address most weeks can all qualify.
Common scenarios that create a PE:
A one-off sales trip or a purely promotional stand at a UK trade show generally won’t create a PE on its own. The trouble starts with recurrence: the same activity repeated month after month starts to look like a fixed presence, even without a lease.
Pro Tip: Keep a simple log of UK-based activity, dates, locations and personnel involved. If HMRC ever queries your position, having contemporaneous records of exactly what happened and when is worth far more than reconstructing it two years later.
This is where most overseas founders get caught out. INTM264510 confirms that a dependent agent PE (DAPE) arises where an agent habitually concludes contracts in the company’s name, or habitually plays the principal role leading to contracts that the company routinely accepts without material change. You don’t need a UK office for this test to bite.
Independent agents genuinely acting for multiple unrelated clients, at arm’s length, usually fall outside the DAPE rules. The exemption is narrower than most people assume: an agent devoting all or nearly all their time to a single principal, or one whose pricing and terms are tightly coordinated with that principal, risks reclassification as dependent regardless of how the contract is labelled.
The post-2017 OECD changes, now reflected in UK domestic updates, lowered the practical threshold by focusing on habitual conduct rather than strict formal signing authority.
Certain activities are treated as preparatory or auxiliary and don’t create a PE on their own, provided they stay genuinely supporting in nature:
The anti-fragmentation rule closes an obvious loophole. If a company (or a related enterprise) splits its UK operations across several sites or entities so each looks preparatory in isolation, but the combined activity forms a coherent business operation, HMRC can treat it as a single PE. A warehouse that also handles returns, customer queries and light assembly stops looking like pure storage fairly quickly, and that’s precisely the kind of arrangement groups fall into when they try to structure around the rules artificially.
Once a PE exists, the UK taxes profits attributable to it using the arm’s-length principle, broadly treating the PE as if it were a separate, independent enterprise dealing with the rest of the group on commercial terms. OECD guidance underpins this attribution approach, and it applies whether the PE is a branch, a fixed office or a dependent agent arrangement.
In practice, this means:
Where a double taxation treaty applies, relief mechanisms prevent the same profits being taxed twice, typically through a tax credit or exemption granted by your home jurisdiction. Understanding corporation tax obligations at this stage saves considerable pain later, particularly around payment deadlines and instalment rules for larger PEs.
Start with an honest inventory before you contact anyone. Gather every UK-related contract, the dates and locations of activity, any agent or distributor agreements, and evidence showing how permanent or habitual the presence has been.
HMRC’s standard assessment window for corporation tax reaches back four years for ordinary errors. That extends to six years where behaviour is deemed careless, and up to twenty years where HMRC considers the behaviour deliberate, including cases where a company knew it likely had a PE and didn’t register. If UK staff are involved, payroll and VAT obligations usually follow close behind the corporation tax question, not after it.
Pro Tip: If you suspect a historic PE that was never registered, get specialist advice before you file anything. A controlled, voluntary disclosure to HMRC is treated very differently to an enforcement discovery, both in penalty terms and in how far back assessments can reach.
Three patterns come up repeatedly. A US founder running the UK side of the business from their London flat, taking calls and approving UK client terms most weeks, usually has a PE within months of starting, whether or not they’ve incorporated anything locally. A single UK-based salesperson working exclusively for an overseas principal, closing deals that head office simply confirms, almost always meets the DAPE test. A short-term UK project of limited duration, generally sits below most treaty construction thresholds, but only if nothing else UK-based runs alongside it.
The diagnostic questions we return to every time: who has authority to bind the company, how habitual is the UK activity, and does the contractual paper trail match what’s actually happening on the ground? When those three point the same way, immediate registration is usually the right call. When they conflict, that’s when a controlled review before HMRC asks the question pays for itself.
— Rahamut
Priceandaccountants works specifically with overseas founders and tech companies who need a straight answer on UK PE exposure, not a generic compliance checklist. With over 40 years of combined experience and a track record supporting international founders through UK entity setup, we assess your specific facts against the fixed-place and dependent agent tests, then map out exactly what registration and filing looks like if a PE applies.
Our strategic advisory and tax planning service covers PE risk diagnostics alongside ongoing corporation tax compliance once a UK presence is confirmed, and our accounting services handle the filing and recordkeeping that follows. If you’re unsure whether your current UK activity crosses the line, send us your contracts, agent arrangements and a rough timeline of UK-based work, and we’ll give you a clear view of where you stand before HMRC forms its own.
For primary reading: CTA 2010’s PE chapter sets the statutory tests; INTM264300 and INTM264510 give HMRC’s interpretation; the OECD/UN commentary on Article 5 covers treaty nuance; and LexisNexis’s practice note summarises recent legislative alignment.
