What characterises the temporary
Three elements, which must all be present. They characterise a permanent activity.
A defined mission, set out in a services contract.
A limited duration, known or at least bounded by the object of the mission.
The absence of permanent infrastructure on the territory.
None of these three reduces to a number of days. The assessment is qualitative, which makes it less predictable but also less mechanical.
A succession of short missions may therefore produce a lasting presence, although each taken alone would remain temporary.
| Signal of the shift | What it indicates | Consequence |
|---|---|---|
| Duration that runs on | An activity that is not temporary | Business permit |
| Permanent resources on site | A de facto establishment | Tax obligations |
| Recurring local clientele | A habitual activity | Social security obligations |
| Staff assigned long term | A stable presence | Luxembourg social security regime |
The signs of a tipping point
Four signals, to watch on a project that runs on. They announce the shift towards establishment.
Repeated extension of the mission, beyond the period initially contracted.
Installing permanent means on the territory, premises, a store, a settled team.
A chain of projects with no real interruption between them.
The continuous presence of a representative exercising management on site.
These signs accumulate rather than apply in isolation, and it is their convergence that characterises establishment.
The tax consequences
This is the heaviest side of the shift.
A site may constitute a permanent establishment for tax purposes, with the consequence that profits attributable to it are taxed in Luxembourg.
The criteria for permanent establishment derive from tax law and the applicable treaties, notably double taxation treaties concluded with the home country.
Those criteria do not necessarily coincide with those of establishment law, meaning a firm may be established for tax purposes without being so administratively, and vice versa.
This dissociation is the source of the costliest misunderstandings in this field, and it justifies a separate check on each of the two grounds.
These questions call for specialist tax advice, and this guide confines itself to flagging that they exist.
The administrative consequences
Three obligations may arise from the shift. They concern tax, social security and the permit.
Obtaining a business permit, if one was not previously required.
Affiliation to Luxembourg social security for the persons concerned, under the applicable coordination rules.
Tax registration, notably for value added tax, covered in the article on VAT registration.
These obligations are not triggered at the same moment, which makes monitoring all the more necessary.
How to respond on a project that extends
Four points.
Re-examine the regime at each contractual extension, rather than once at the outset.
Document the duration initially foreseen and the reasons for exceeding it.
Consult a tax adviser as soon as the duration appreciably exceeds what was planned.
Do not wait for an inspection to regularise, voluntary regularisation generally being treated better.
What the shift does not change
Two elements stay constant.
The posting obligations, which continue to apply to employees sent.
Contractual obligations arising from the contract, which do not depend on the party's status.
What this means for a professional
Four rules.
Treat duration as a moving variable, not as a figure fixed at the start.
Distinguish tax establishment from administrative establishment, which follow different criteria.
Build in a review point in the monitoring of any long project.
Refer to a tax adviser as soon as the signs appear, rather than afterwards.
This article reflects the rules at the date of checking and serves professional orientation. It constitutes neither tax nor legal advice.