How do you register your address in Luxembourg in 2026?

Bring a valid identity document, proof you may occupy the home (lease, host letter or deed), and any stay authorisation you already hold. Guichet.lu states that anyone establishing usual residence must declare arrival at the new commune. People who move within Luxembourg must file within eight days of occupying the new residence. Third-country nationals who are not family members of an EU national must declare within three days of arrival, regardless of how long they plan to stay. EU, EEA and Swiss citizens who stay more than three months also complete a registration certificate (déclaration d'enregistrement) at the same commune within three months; that certificate is separate from the first arrival stamp but often starts at the same counter.

Some communes let you begin a change of usual residence online through MyGuichet.lu once you already hold LuxTrust or another accepted login. First-time arrivals still often need an in-person visit for identity checks and the paper confirmation. Ask whether English, French or German is available that day; French dominates many municipal letters even when your office speaks English.

Keep the déclaration d'arrivée or residence certificate the commune issues. Retail banks, payroll teams and residence-permit packs routinely ask for it. Your thirteen-digit national identification number (matricule) is tied to Luxembourg's population and social-security systems; commune registration and CCSS affiliation are how that number becomes usable for everyday admin. Do not invent a second address for convenience: the lease must support registration if you need the declaration for salary or a bank account.

Address choice also decides school catchments and commute reality on free Luxtram and trains. Compare bases on Where to live in Luxembourg and capital districts on Living in Luxembourg City before you lock a commune that fights your office hours.