Published on 07/08/2026 · Sources last reviewed: 06/08/2026 · Our method

Arriving in Luxembourg: what to do, and when

Most arrival checklists tell you what to do. This one also tells you what you do not have to do — because in Luxembourg two steps happen without you, and chasing them wastes the time of those who have least of it.

Why you can trust this page — and how far. Every deadline below carries the event it runs from, and its source. The first version of this collection was submitted to three independent verifiers: it was refuted on all three lenses. What follows is the corrected version. What we have not established is named at the end of the page.

Trap no. 1: “arrival” means nothing

Five different events trigger Luxembourg's deadlines, and confusing them shifts a statutory deadline by several weeks:

your entry into the territory;
your move into the home;
your declaration to the commune;
your first day of work;
your affiliation to social security.

The statutory deadlines

Step	Deadline	Running from	Who acts
Declaration to the commune	8 days	occupation of the home	you
Declaration to the commune — third-country national	3 working days	entry into the territory	you
Social security entry declaration	8 days	start of employment	your employer
Registration of an imported vehicle	6 months	the declaration to the commune	you

Two remarks that cost dearly if missed. The three days for third-country nationals are working days, and they run from entry into the territory — not from moving in. Someone entering on the 1st and settling on the 20th has been in breach since the 4th.

And the vehicle's six months run from the declaration to the commune, not from your arrival in the country. They are indeed six calendar months: counting them in days places the deadline after the legal limit.

What you do not have to do

Social security affiliation is your employer's business. They have eight days from your start of employment. In case of delay, the fine — €50 a month beyond a 30-day tolerance, capped at €2,500 — falls on the employer, not on you. You check; you do not act, and you do not worry.

The tax withholding card is sent to you without any step on your part, on average 30 working days after your affiliation — on one condition: being affiliated in Luxembourg as an employee.

The condition excludes real-world cases. If you are taxable in Luxembourg but affiliated elsewhere — heavy remote work, dual activity — you must request it yourself, via form 164. Without a card 30 working days after your first day of work, contact the competent RTS office.

Two steps many people miss

Family allowances must be applied for in both countries

This is the costliest mistake, and it is common in both directions. The Caisse pour l'avenir des enfants writes: “You must therefore make an application in these two countries” — your country of residence and Luxembourg. Filing on only one side loses the Luxembourg share, which is the larger one.

And Luxembourg does not always pay a mere top-up: work prevails over residence. If your spouse carries out no activity in your country of residence, Luxembourg pays first and every month.

The automatic exchange between funds concerns the amounts, not the opening of your file: that remains for you to do, with a certificate from the fund that last paid.

School is not automatic for a newcomer

You often read that “the commune enrols automatically”. That is correct — but for a child already resident who turns four before 1 September.

A child who arrives is guided by the Service d'intégration et d'accueil scolaires. And a family arriving mid-year must contact its commune of residence directly.

What this page does not yet cover

✔ The health cover of family remaining abroad was listed here as not established. It has been since 7 August 2026, and the answer is not the one you would guess: Luxembourg domestic law does not cover it — article 7 of the Social Security Code requires residence in the Grand Duchy — it is European regulation 883/2004 that covers it. Another surprise: since Luxembourg is not listed in Annex III of that regulation, your family can be treated in Luxembourg, and not only in emergencies.

Opening a bank account: necessary in practice, but no statutory deadline attaches to it.
Home and liability insurance: contractual obligations, not administrative ones.
The annual school calendar — application for another commune before 1 May, answer before 15 May.

Sources: law of 19 June 2013 (arrival declaration); amended law of 29 August 2008 (third-country nationals); guichet.public.lu; Caisse pour l'avenir des enfants; Ministry of Education. Consulted and verified on 6 and 7 August 2026.