Tax law · Luxembourg
Your income tax lawyer in Luxembourg, matched to your situation
Tell us what the Luxembourg tax administration, a foreign adviser or your employer has raised, and we put your file in front of lawyers who handle income tax work in the Grand Duchy. We give no legal advice ourselves — we make a careful, free match.
- Lawyers registered with the Barreau de Luxembourg or the Barreau de Diekirch
- Resident and non-resident income tax, treaty relief and disputed assessments
- Free matching, with no obligation to instruct anyone
Free and without obligation. Your details are shared only with lawyers who actually handle Luxembourg income tax matters.
Get matched with a lawyer
Tell us about your situation and receive a free, confidential case review.
Understanding the matter
Income tax in Luxembourg: what decides your position
Income tax in Luxembourg turns on one question before any other: are you a resident or a non-resident? Residents are taxed on worldwide income, non-residents only on Luxembourg-source income, and holding a residence permit does not by itself make you a tax resident. That single distinction shapes cross-border commuters’ files, expatriate assignments, rental and investment income, and relief under tax treaties. An income tax lawyer in Luxembourg reads your facts against the applicable treaty, the administrative position and the deadlines that apply to you, and represents you if the position is challenged. We do not advise you ourselves. We listen, identify the issue, and match you with a lawyer registered on the roll of one of the Grand Duchy’s two Bars.
Luxembourg in practice
How income tax matters work in Luxembourg
Luxembourg follows the continental civil-law model, and tax disputes run through a separate administrative order rather than the ordinary courts. The points below are the ones that most often shape an income tax file in the Grand Duchy.
Who is entitled to advise you
Luxembourg has two independent Bars: the Barreau de Luxembourg and the Barreau de Diekirch. Only lawyers registered on the roll of one of them may give legal consultations as a habitual paid activity, and they are bound by professional secrecy protected by criminal law. Before the administrative courts, representation by an avocat à la Cour (List I) is in principle mandatory.
Residence decides the tax base
A resident taxpayer is taxed on worldwide income; a non-resident only on Luxembourg-source income. Residence turns on having a fiscal domicile or habitual residence in the Grand Duchy, and holding a residence permit does not by itself create tax residence. This distinction matters most to the large cross-border workforce commuting into Luxembourg every day.
Where a tax dispute is heard
Tax litigation follows the administrative order, not the civil courts: the Tribunal administratif hears the case at first instance and the Cour administrative on appeal. An action before the Administrative Tribunal must generally be brought within three months. Luxembourg also levies no court fees payable to the State for bringing proceedings.
What a tax case costs
The most substantial cost is legal fees. There is no binding official tariff: the lawyer sets fees in agreement with the client under Article 38 of the Law of 10 August 1991, taking account of the importance and difficulty of the matter, the result obtained and the client’s financial situation. Disputes over fees may be brought before the Bâtonnier.
Legal aid for individuals
Natural persons of insufficient means may apply for legal aid (assistance judiciaire) in civil, commercial and administrative cases and in criminal matters. It can be total or partial — 50% or 25% — and covers lawyers’, notaries’, bailiffs’ and translators’ fees. The Bâtonnier of the Bar of your place of residence decides; non-residents apply to the Barreau de Luxembourg.
Working languages of the file
French, German and Luxembourgish are the three administrative languages. Procedural documents must be drafted in French, hearings may be conducted in any of the three, and court-provided translation is paid for by the State. Laws are published in French in the Mémorial and consulted through the Legilux database.
Every country-specific statement on this page is drawn from official Luxembourg bodies (Ministry of Justice, Guichet.lu, Legilux, the Direct Taxes Administration) and the European e-Justice Portal, consulted in 2025.
- European e-Justice Portal — National justice systems: Luxembourg
- Ministry of Justice — The legal profession (avocat)
- Guichet.lu — Court and lawyers’ costs, legal aid
- Guichet.lu — Administrative proceedings and judicial appeals
- Administration des contributions directes — Residents and non-residents
- Legilux — Civil Code (limitation periods)
- European e-Justice Portal — Access to justice in Luxembourg
- Guichet.lu — Filing the inheritance declaration
- Justice portal — Succession matters
Why people look for help
The situations that bring an income tax file to a lawyer
Most people who contact us already sense something is wrong. It is usually one of these three.
Residence or non-residence is unclear
You moved to Luxembourg, or you commute in daily, and nobody has explained which income falls into which tax base. Holding a residence permit does not settle it.
A cross-border file with two administrations
You work in one country, live in another, and both sides ask for the same information. Luxembourg’s tax treaties follow the OECD model, but applying them to your facts is where files go wrong.
Deadlines you were not told about
An administrative decision you disagree with does not wait: an action before the Administrative Tribunal must generally be brought within three months. Other time limits differ by subject matter.
How the matching works
What you get when you send us your Luxembourg tax question
We are not a law firm. Our job is to get your facts in front of the right lawyer, quickly and at no cost to you.
Lawyers admitted in Luxembourg
We match you only with lawyers registered on the roll of one of the Grand Duchy’s two Bars — the Barreau de Luxembourg or the Barreau de Diekirch — so anyone advising you is entitled to practise there.
Income tax, not general practice
Your request goes to lawyers who handle income tax work: residence questions, non-resident source income, treaty relief, assessments under challenge and the administrative proceedings that follow.
One request, several profiles
Describe your situation once. We compare it with the lawyers available for your type of matter and come back with a shortlist you can speak to, instead of leaving you to cold-call firms.
Free and without obligation
Matching costs you nothing and you decide afterwards whether to instruct anyone. Fees are then agreed directly with the lawyer: Luxembourg leaves fee-setting to the lawyer and client, not to an official tariff.
Cross-border files
Where our Luxembourg tax enquiries come from
Income tax questions rarely stop at one border. These are the European countries most often involved when a file handled in Luxembourg also concerns another tax administration.
Common questions
Income tax in Luxembourg: questions we are asked
Do I need an income tax lawyer in Luxembourg, or can I handle the return myself?
Anyone can complete an administrative form, but in Luxembourg only lawyers registered on the roll of the Barreau de Luxembourg or the Barreau de Diekirch may give legal consultations as a habitual paid activity. If your position is contested, cross-border or involves treaty relief, an income tax lawyer in Luxembourg is the professional who can advise you and, where needed, represent you.
I live abroad and work in Luxembourg. Which income is taxed there?
For direct taxes, a non-resident is taxed only on Luxembourg-source income, while a resident is taxed on worldwide income. You are resident if you have a fiscal domicile or habitual residence in the Grand Duchy; a residence permit does not by itself create tax residence. Luxembourg’s treaties, which follow the OECD model, then eliminate double taxation by exemption or credit.
Where would a Luxembourg tax dispute be decided?
Tax litigation goes to the administrative order: the Tribunal administratif at first instance and the Cour administrative on appeal. An action before the Administrative Tribunal must generally be brought within three months, and representation by an avocat à la Cour is in principle mandatory before the administrative courts. Luxembourg levies no court fees payable to the State for bringing proceedings.
How are lawyers’ fees set in Luxembourg?
There is no binding official tariff. Under Article 38 of the Law of 10 August 1991 the lawyer fixes fees in agreement with the client, taking into account the importance and difficulty of the matter, the result obtained and the client’s financial situation. Disputes over fees may be brought before the Bâtonnier of the relevant Bar.
Can I obtain legal aid for an income tax matter?
Legal aid (assistance judiciaire) is available to natural persons of insufficient means in civil, commercial and administrative cases and in criminal matters, and can be total or partial (50% or 25%). It covers lawyers’, notaries’, bailiffs’ and translators’ fees. The Bâtonnier of the Bar of your place of residence decides; non-residents apply to the Barreau de Luxembourg.
What language will my Luxembourg tax file be handled in?
French, German and Luxembourgish are all administrative languages. Procedural documents must be drafted in French, but hearings may be held in any of the three and translation provided by the court is paid for by the State. Laws and the official journal are published in French, so a working command of French helps even where you speak German or Luxembourgish.
Next step
Put your Luxembourg income tax question to a specialist
Tell us in a few lines what the Luxembourg tax administration, your employer or a foreign adviser has raised, and we will match you with a lawyer who handles income tax work in the Grand Duchy. Matching is free, there is no obligation, and you stay in control of who you instruct.