Posting of Workers — EU and Non-EU — Luxembourg

1. European legal framework

The posting of workers regime is built on three EU instruments transposed into the Luxembourg Labour Code:

Employment law applicable to the posted worker

Directive 96/71/EC of 16 December 1996, as amended by Directive (EU) 2018/957 of 28 June 2018, establishes the hard-core principle: the essential employment conditions of the host State (minimum wage rates, working time, paid leave, health and safety, equal treatment) apply to every posted worker regardless of the law governing their contract. The 2018 revision also introduced a long-term posting regime beyond 12 months, extendable to 18 months on motivated notification to the competent authority.

Social security: maintaining affiliation in the sending country

Regulation (EC) No 883/2004 of 29 April 2004, Article 12, allows a posted worker to remain affiliated to their home State's social security scheme throughout the posting, provided it does not exceed 24 months and the worker does not replace another posted worker. This status is evidenced by the A1 certificate (formerly E101), issued by the social security body of the sending country.

Enforcement mechanisms and administrative cooperation

Directive 2014/67/EU of 15 May 2014 strengthens enforcement and administrative cooperation tools between Member States. It is the legal basis for the obligation to provide workers with a written information document (postings exceeding four weeks) and for the IMI system (Internal Market Information) used notably for road transport.

2. Conditions for qualifying as a posting (Art. L.141-1)

For an operation to qualify as a posting under the Luxembourg Labour Code, three cumulative conditions must be met:

• Subsisting employment relationship: an employment relationship must exist between the sending company and the worker throughout the entire posting period;
• Time-limited service contract: the posting forms part of a contract covering a specific subject matter that ends when the service is completed;
• Worker normally based abroad: the worker normally performs their duties outside Luxembourg and comes to Luxembourg solely for the limited duration of the service.

A posting may be organised in three ways: on behalf of the sending company under a contract with a Luxembourg recipient; within an establishment or entity of the same group; or through a temporary work agency or labour hire arrangement (Art. L.141-1).

3. Employer obligations for inbound postings

Any employer posting a worker to Luxembourg — whether established in the EU or outside — is subject to the same compliance obligations under employment law (Art. L.142-2 and L.142-3).

Prior declaration and social badge (Art. L.142-2)

The company must file a prior declaration with the ITM via the dedicated electronic platform, no later than the start of work. This declaration generates the Luxembourg social badge, which must be present at the worksite or place of service. The employer must also designate a reference person present on Luxembourg territory and available to liaise with the authorities.

Documents to be kept available (Art. L.142-3)

The following documents must be accessible at the place of work (or with the reference person), translated into French or German:

• the service contract and the posted worker's employment contract;
• the A1 certificate (or equivalent proof of social security affiliation in the sending country);
• pay slips, proof of payment and timesheets;
• for third-country nationals: a copy of the valid residence permit or work authorisation.

Luxembourg public-policy rules (Art. L.010-1)

Luxembourg's public-policy provisions apply to all workers performing an activity on Luxembourg territory, including posted workers. These cover in particular: the social minimum wage (SSM), maximum working time and minimum rest periods, statutory paid annual leave, and health and safety rules.

4. Non-EU specifics: immigration obligations

Where the sending company is established outside the European Union, additional immigration obligations apply on top of — not instead of — the ITM declaration and documentation requirements set out in Section 3.

Obligations of the sending company

A company established outside the EU must obtain from the Directorate General of Immigration (DGI):

• a collective posting authorisation covering the workers concerned;
• a business establishment authorisation prior to any economic activity on Luxembourg territory.

Worker obligations according to length of stay

For an EU citizen (or equivalent: Iceland, Liechtenstein, Norway, Switzerland) posted by a non-EU company, residence formalities depend on the duration of the assignment:

• Stay of less than 3 months: no specific formality required for the worker;
• Stay of more than 3 months: the worker must complete two steps at their municipality of residence — an arrival declaration (within 8 days) and a registration declaration (within 90 days). Documents required: identity document, employment contract and A1 certificate.

For third-country nationals (non-EU), a residence permit and work authorisation are required before the posting begins. These documents form part of the records to be kept available at the place of work (Art. L.142-3).

5. Road transport: specific regime (Art. L.145-1 to L.145-4)

Mobile workers (drivers) engaged in professional road transport are subject to a specific regime that partly derogates from the general posting rules.

Scope of application

This regime applies to companies engaged in the professional carriage of passengers or goods whose registered office is outside Luxembourg (Art. L.145-1). It covers both EU companies and third-country companies carrying out transport operations on or to Luxembourg territory.

Exemptions

The following are not treated as postings under this specific regime (Art. L.145-2):

• simple transit through Luxembourg territory without loading or unloading;
• bilateral transport operations (goods or passengers) meeting certain conditions set out in EU regulations.

Declaration via the IMI system

The transport company must submit a declaration via the Internal Market Information (IMI) system no later than the start of the posting (Art. L.145-4). This European system, provided for by Directive 2014/67/EU, ensures cooperation between national administrations and replaces the standard ITM declaration for this specific category.

6. Maintaining Luxembourg social security and information obligations

Continuing Luxembourg social security affiliation (Art. CSS-I-3 and CSS-III-176)

A worker habitually employed in Luxembourg who is temporarily posted abroad remains affiliated to Luxembourg sickness (Art. CSS-I-3) and pension (Art. CSS-III-176) insurance throughout the posting. This continuation is conditional on compliance with the 24-month ceiling set by Article 12 of Regulation (EC) No 883/2004. Beyond that limit, affiliation transfers to the host State, unless a specific bilateral convention provides otherwise.

The Luxembourg employer must obtain an A1 certificate from the CCSS before the posting begins. This document evidences, to the host State's authorities, that the worker remains covered by Luxembourg social security.

Employee information obligations (Directive 2014/67/EU)

Where the posting exceeds four weeks, the employer must provide the worker with a written document specifying:

• the country of work and the expected duration of the posting;
• the applicable remuneration, the payment currency and any posting-related benefits;
• the repatriation conditions at the end of the assignment;
• a link to the official website of the host Member State containing information on applicable terms and conditions of employment.

7. Switch to full law after 12 months and comparative table

From the 13th month of posting, a company posting workers to Luxembourg becomes subject to the full body of Luxembourg employment law — not just the hard core — except for rules on the formation and termination of employment contracts and supplementary pension schemes (Art. L.141-2). This long-term posting regime is the direct implementation of Directive (EU) 2018/957.

This period may be extended to 18 months provided the company submits a motivated notification to the ITM before the initial 12-month period expires. In the absence of such notification, the switch to full Luxembourg law is automatic from the first day of the 13th month.