Primary sources first
Every guide on this site is built against the same short list of primary sources. Where a guide refers to a rule, a rate or a procedure, the underlying source is one of the following:
- Guichet.lu — the official citizen portal — for procedures, forms and the workflow side of administrative processes.
- STATEC for demographics, wages, housing prices, inflation, and the broader picture of who lives and works in Luxembourg.
- ACD — the Administration des Contributions Directes — for income tax, including circulars (LIR notes), forms (such as form 100 for the annual return) and the official tax brackets.
- CCSS — the Centre Commun de la Sécurité Sociale — for social security registration, contributions and the joint declarations employers file.
- CNS — the Caisse Nationale de Santé — for what the public health insurance covers, the reimbursement workflow, and the dependency contribution.
- Mémorial A — the official journal — for the text of laws and grand-ducal regulations, and for tracking when amendments enter force.
- EUR-Lex for EU directives and regulations, including Regulation 883/2004 on social-security coordination and the directives that govern cross-border workers.
- ITM — the Inspection du Travail et des Mines — for labour law, working time, and posted workers.
- Parliamentary record (Chambre des Députés) for legislative changes that have been voted but not yet codified into a Mémorial entry, and for the explanatory memoranda that accompany bills.
What you will not see in the sources list: a relocation company's blog, a bank's PR brochure, a competitor newsletter, or a Reddit thread. Those are sometimes useful starting points for "what should I check?" — they are never sources in their own right.
When we cite a number
Numbers in Luxembourg move. The social minimum wage (salaire social minimum) is indexed and re-indexed; tax brackets shift with each finance law; the dependency contribution rate is adjusted; the threshold for the impatriate regime changes by article of the budget law. So whenever this site publishes a figure, it states the year that figure applies to and links to the official source. A 2024 bracket and a 2026 bracket are not interchangeable, and the site treats them as different facts.
If a number is in doubt — because a finance law is mid-passage, because the editor has read two contradictory sources, or because the Mémorial entry is unclear — the guide marks the figure with a verify tag and links to whatever the most authoritative current source is. Marking something as needing verification is preferable to publishing a confident number that turns out to be wrong.
What we don't do
- Don't aggregate competitor blogs. If something is true, it can be found at the source. If it can only be found in other blog posts, that is a sign the claim needs to be checked, not repeated.
- Don't use AI to write substantive prose. Large language models are useful for outlines, for catching typos, and for spotting awkward phrasing. They are not used to generate the body of any guide on this site. Guides are written by the editor, sentence by sentence.
- Don't recommend specific banks, insurers, schools or advisors as "best". "Best" is not a property of a Luxembourg retail bank or a complementary health insurer; it is a property of the fit between an institution and a particular household's situation. The guides explain the trade-offs and let readers decide.
- Don't write SEO listicles. "Top 10 banks in Luxembourg" is a format optimised for traffic, not for being useful. The site avoids it.
Review cycle
Each guide carries a "last reviewed" date in the header. The review cycle works like this:
- Every guide is re-reviewed at least once a year, even when no relevant law has changed, to catch quiet drift in things like Guichet.lu wording, form numbers or contact details.
- When a relevant law changes — a new Mémorial entry, a new ACD circular, a new EU regulation — the affected guides are reviewed within four to six weeks. The "last reviewed" date is updated when the review is complete.
- Major rewrites are noted in the page footer, with a brief note describing what changed.
Where a page describes a procedure that has been replaced (for example, a paper form that is now an online declaration), the page is rewritten rather than archived. The site favours a small number of accurate pages over a large number of stale ones.
Corrections policy
Errors are corrected as fast as possible. The flow is:
- A reader, or the editor, identifies a probable error.
- The editor checks the claim against the primary source.
- If the page is wrong, it is corrected, and a short note is added at the foot of the page: the date, the section affected, and what changed.
- If the reader who flagged the error wants credit, they are named in the note. They can equally ask to remain anonymous.
- If the correction is significant enough that anyone relying on the old version may have been misled — a wrong figure, a misstated rule, a procedure described in the wrong order — the correction is also flagged at the top of the page for a period after the change.
The contact page describes how to flag a correction: an email with a link to the official source is the fastest path.
Editorial independence
No paid placements. No sponsored content. No affiliate links. No "preferred partners". The editor is not on retainer with any Luxembourg bank, insurer, school, real estate agency or relocation firm, and World.lu does not take referral fees from those companies. This is a deliberate choice — it makes the site cheaper to run on the revenue side, and far easier to keep honest on the editorial side. The about page covers the funding model in more detail.
If that ever changes — for example, if the site introduces sponsorship — it will be disclosed on this page before it is implemented, and disclosed on every page where it applies.
Languages and translation
English is the primary edition. The French, German and Spanish editions are translated by the editor — not generated by automatic translation and not delegated to an unverified service. Each translation aims for the same level of precision as the English version: a tax bracket cited in English must be cited in French in a way that a French-reading reader would recognise from their own administration.
Because translation is a human process, translated editions can lag the English edition by a few weeks after a major update. When that is the case, the translated page shows the "last reviewed" date of the translation rather than the English original, so readers can see which version of the rules they are looking at.
Where to go next
The about page covers who runs World.lu and why. The contact page has the editorial email, including how to flag a correction. The privacy page lists what the site does and doesn't collect, in plain language.