Cross-border employee mobility — permanent establishment red flags after remote work

The post-pandemic remote-work normalisation produced a permanent- establishment (PE) overhang that tax authorities have spent the last two years quietly cataloguing. Enquiries now arrive from people who already know the answer.

Five red flags that consistently trigger PE enquiries in 2026.

1. The senior commercial role abroad

A sales director, country head or business-development lead working "remotely from" a country where the employing entity has no formal presence is the single most common trigger. The OECD Model Tax Convention Article 5(5) dependent-agent test does not require a contract-signing authority in the strict legal sense — it requires the habitual exercise of negotiating authority that produces contracts the principal accepts in substantially the negotiated form.

For senior commercial roles, that test is met more often than it is not, regardless of how the contract is drafted.

2. Multi-month stays in a single country

Even employees in non-commercial roles (engineering, finance, operations) accumulate PE risk when they spend more than 183 days in a single calendar year in a country where the employer has no presence. The 183-day threshold is treaty language; the underlying test is the existence of a fixed place of business at the employee's disposal. A long-term hotel stay at the company's expense, a company-leased apartment, or a co-working desk paid by the company all engage the test.

3. The "head of region" pattern

An executive who oversees activities in one or more countries while based in another country triggers the Article 5(5) test if the oversight involves commercial decision-making (pricing, key personnel hires, customer negotiations). The pattern is most exposed when the executive's compensation is structured around the regional P&L.

4. The IT engineer abroad on a critical product

Where the engineer's work is a core income-generating activity of the group (e.g. lead architect on the platform that generates the group's revenue), the PE analysis is harder than the Article 5(4) "preparatory or auxiliary" exemption suggests. Several tax authorities have argued — successfully on review — that core IT engineering is not preparatory or auxiliary in a software-driven business.

5. The director's residency mismatch

A statutory director of a non-resident entity who is tax resident in a third country can trigger a place-of-effective-management (POEM) challenge on the entity's residency. The challenge is harder to defend when the director performs material strategic functions from the third country, regardless of where the board formally meets.

What we tell clients to do

Map the employee population against the five flags annually. Where a flag fires:

1. Decide explicitly: accept the PE risk and provision for it; mitigate by structural change (formal entity, reassignment, role re-scoping); or escalate to local tax counsel for a clearance.
2. Maintain a written rationale for each decision. The recurring weakness is groups that recognise the issue but cannot evidence that they did.
3. Refresh the analysis after every material change to the role.