Finance
Cross-border workers
Frontalier taxes in Luxembourg: the 90% rule and the remote-work day limits explained
Nearly half of Luxembourg's workforce commutes from France, Belgium or Germany. These frontaliers are taxed at source in tax class 1, but can opt for resident assimilation to unlock class 2 and deductions if 90% of household income is taxed in Luxembourg (50% for Belgians). A separate 34-day limit governs how many home-working days stay tax-free; social security uses yet another rule, allowing up to 49% remote work.