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Remote working for cross-border workers in Luxembourg: the rules to know in 2026
On the social security side, the European framework agreement allows up to 49.9% remote working, provided the employer declares it to the CCSS.
Regarding social security, the European framework agreement allows for up to 49.9% remote work, provided the employer declares it to the CCSS.
The Luxembourg government has said it is open to a 25% threshold, or around 56 days a year, but no change is in effect to date.
With nearly 47% of the country's 525,000 employees being cross-border workers in 2025, according to STATEC, Luxembourg is one of the labour markets where remote working for cross-border workers raises the most practical questions. For companies, it is an argument for attractiveness and retention, and for employees, a way to ease commutes that can be gruelling. Yet the framework remains more restrictive than for residents, and it rests on two rules that must not be confused.
A well-established but unevenly distributed form of remote working
According to the latest STATEC report, relayed by the outlet Les Frontaliers, 36% of working residents in Luxembourg work from home at least occasionally. This figure rose from 20% to 38% during the pandemic before stabilising, despite attempts by some employers to reduce remote working.
There are significant differences between sectors. Remote working is particularly widespread in information technology, financial and insurance services and scientific activities, but it remains very limited in education, healthcare, industry, construction and retail. STATEC describes it as "a selective phenomenon": 49% of skilled white-collar workers work remotely, compared with 11% of low-skilled employees and 3% of skilled manual workers.
In this landscape, cross-border workers do not have the same room for manoeuvre as residents. Their remote working depends on tax and social security rules specific to cross-border situations.
Remote working for cross-border workers: two thresholds not to be confused
From a tax perspective, the conventions concluded with France, Belgium and Germany tolerate 34 days a year worked outside Luxembourg. Beyond that, the country of residence regains the right to tax. According to Paperjam, French cross-border workers are then taxed in France from the first day. The lawyers at Frontaliers Grand Est specify that, for Belgians, every day spent outside Luxembourg counts, even partially, whether it is remote working, a business trip or training.
On the social security side, the basic threshold is 25% of working time. Since 1 July 2023, a European framework agreement has allowed up to 49.9% while remaining affiliated to the Luxembourg system. Its application is neither automatic nor mandatory: remote working must be regular and carried out solely in the country of residence, and the employer must declare it to the CCSS, which then issues an A1 certificate.
The gap between the two thresholds is considerable, since 49.9% represents around 100 days a year, compared with 34 for tax purposes. The framework agreement therefore secures social contributions, but not taxation, and it is possible to comply with one threshold while exceeding the other. Moreover, remote working is not a right: it is set up by mutual agreement with the employer, ideally through a written amendment to the employment contract specifying the days, the location and the equipment.
A higher limit under discussion, but nothing decided yet
In a parliamentary answer published in January 2026 and reported by Paperjam, the Ministers of Finance and Foreign Affairs rejected the French proposal of 40% remote working, or 80 to 90 days a year. They did, however, say they were open to a 25% threshold, or around 56 days, in return for stronger cross-border co-development. More than 126,000 French cross-border workers were working in Luxembourg in 2025, according to the IGSS.
Behind this answer was MP Sven Clement (Piratepartei), who defended the extension of remote working as "an urgent necessity to maintain the viability of the Luxembourg economic model", highlighting the deterioration of the rail network for French cross-border workers. Employers' organisations are also calling for more days at home.
For now, the 34-day ceiling remains in force, as Frontaliers Grand Est points out in its summer 2026 update. A parliamentary question tabled in late June 2026 illustrates the gap: the civil service allows up to 60% remote working, but its cross-border employees come up against the same tax ceiling as private-sector employees.
Anticipate rather than wait: the right habits
While waiting for a possible change in the Franco-Luxembourg framework, remote working for cross-border workers in Luxembourg calls for rigour. It is best to put the agreement in writing, keep a precise count of the days worked outside the Grand Duchy and check that the employer has made the declaration to the CCSS.
For companies, it is also a recruitment issue, as remote working policy weighs ever more heavily on how attractive a job offer is to cross-border candidates.
FAQ
How many days of remote working can a cross-border worker do without tax consequences?
The tax conventions tolerate 34 days a year worked outside Luxembourg. Beyond that, the country of residence may tax the days concerned.
Does the 49.9% framework agreement apply automatically?
No, it requires an agreement between the employee and the employer, who must declare the situation to the CCSS. It protects social security affiliation, not taxation.
Will the 34-day threshold change?
The Luxembourg government has said it is open to a 25% threshold, or around 56 days a year, but no change is in effect to date.
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