More than 130,000 French cross-border workers commute to the Grand Duchy every day. When a legal problem arises — an accident on the A31, a contested dismissal, police custody in Luxembourg, a divorce of a binational couple — it never stops cleanly at Schengen. The firm is admitted simultaneously to the Metz Bar and to the Luxembourg Bar, which makes it possible to handle a file on both sides without changing counsel.
The first question in any cross-border file is rarely "who is at fault?" but rather "which court should be seised?". The answer depends on the subject matter (civil, criminal, employment), the applicable European rules and the specific features of the two legal orders.
In civil and commercial matters, Brussels I bis generally allocates jurisdiction to the courts of the defendant's domicile, with special rules for contracts (place of performance), tort (place of the harmful event) and consumer or employment contracts (most protective forum).
In criminal matters, French territorial jurisdiction is set out in articles 689 ff. of the Code of Criminal Procedure; in Luxembourg, in articles 5 ff. of the Code of Criminal Investigation. Conflicts are arbitrated through Eurojust and the instruments of judicial cooperation in criminal matters.
In employment matters, a French resident working in Luxembourg is in principle subject to Luxembourg labour law, but social security depends on Regulation (EC) 883/2004. For wrongful dismissal litigation, the choice between the Luxembourg Labour Tribunal and the French Conseil de prud'hommes must be analysed case by case."
The court's jurisdiction does not determine the applicable law. A French judge may very well apply Luxembourg law, and vice versa.
For contracts, Rome I permits the parties to choose the applicable law (governing-law clause); failing such a choice, it designates the law of the country where the party performing the characteristic obligation has its habitual residence.
For tort liability (accidents, fault), Rome II generally points to the law of the country where the damage occurs, subject to exceptions (common residence of the parties, manifestly closer connection with another country).
For family matters (divorce, international succession, parental authority), specific regulations apply: Brussels II ter (parental responsibility and divorce), Rome III (law of the divorce), Succession Regulation 650/2012.
The European arrest warrant (EAW), introduced by Framework Decision 2002/584/JHA, replaced traditional extradition between Member States. Issued by a judicial authority of one Member State, it requires the executing State to arrest and surrender the person sought within short deadlines (60 days, extendable).
In practice: a person arrested in Metz may be surrendered to Luxembourg to be tried there, and vice versa. The procedure is fast and the list of grounds for refusal is limited. Defence must therefore deploy from the first hour — in France to challenge execution, in Luxembourg to prepare the merits trial. Dual admission allows acting on both fronts simultaneously.
Beyond the EAW, criminal cooperation rests on the Schengen conventions, the European Convention on Mutual Assistance in Criminal Matters (1959) and information-exchange instruments (Europol, Eurojust, ECRIS for criminal records).
A personal injury accident on the A31, A4 or N4, between Metz and Luxembourg, is the archetypal cross-border file. It involves the country of the event (applicable law), the country of residence of the victim (place of medical care, of income loss), and the insurer of the responsible vehicle (often registered in a third country).
On the French side, the Badinter Act of 5 July 1985 offers a regime favourable to non-driver victims; the Dintilhac nomenclature structures the assessment of damages. On the Luxembourg side, the regime is different and has no strict equivalent of the Badinter Act — the Insurance Code and local case law apply.
The choice of court (Metz Judicial Court? Luxembourg District Court?) and the choice of applicable law (Rome II) often determine the quantum of compensation by themselves. An early analysis, before any signature or medical expert assessment, is therefore decisive.
Without dual admission, a French attorney handling a cross-border file must associate a Luxembourg colleague (or vice versa) every time an act must be performed on the other side of the border: writ, pleading, enforcement. This multiplies costs, lengthens timelines and fragments strategy.
With dual admission, the same attorney pleads in Metz in the morning and in Luxembourg City in the afternoon. Submissions are drafted coherently; overall strategy is never lost from sight; the client has a single counsel, fluent in both legal orders and in the three working languages (French, German, English).
Maître Hélène Tared has been admitted to the Metz and Luxembourg Bars since 2020. She is also a member of the Luxembourg Association of Criminal Law Attorneys (ALAP), the professional network dedicated to criminal law in the Grand Duchy.
Any field can include a cross-border dimension, but four families concentrate the bulk of the firm's cases.
Police custody on one side of the border for facts committed on the other; European arrest warrant; criminal judicial cooperation; extradition; cases involving cross-border workers (theft, fraud, offences against the person) with a France-Luxembourg dimension.
Road accident between the two countries (A31, A4, N4, the Luxembourg A6 motorway); workplace accident affecting a cross-border worker; medical malpractice in a Luxembourg hospital affecting a French resident, or vice versa.
Challenges to dismissal of a cross-border worker employed in Luxembourg; arbitrating jurisdiction (Luxembourg Labour Tribunal or French Conseil de prud'hommes); tax and social-security questions linked to cross-border status.
Divorce of a binational couple or of partners residing on each side of the border; child custody in case of separation; succession opened in Luxembourg for a French-resident decedent or vice versa; recognition and enforcement of foreign decisions.
A French resident working in Luxembourg is in principle subject to Luxembourg labour law, and the Luxembourg Labour Tribunal has jurisdiction. However, Article 21 of Brussels I bis gives the employee an option: they may also seise the courts of the country where they habitually work (Luxembourg) or, in some cases, those of the employer's country. The choice depends on the applicable law, the compensation scales, the deadlines and the overall strategy — and is made case by case.
Everything depends on the exact place of the accident. On the French side, the Badinter Act applies, with the Dintilhac nomenclature favourable to non-driver victims. On the Luxembourg side, the regime is different and globally less protective for drivers. Rome II generally points to the law of the country where the damage occurs as the applicable law. An early medical expertise and an item-by-item assessment, without signing the insurer's first offer, are essential.
In Luxembourg, the lawyer must be admitted to the Luxembourg Bar to intervene directly in custody. A dual Metz-Luxembourg admission allows immediate intervention. For urgent matters, you may call directly — criminal defence, in France as in the Grand Duchy, is prepared from the first hour and often shapes the entire procedure that follows.
Jurisdiction is governed by Brussels II ter (habitual residence of the spouses, last common residence if one of them still lives there, etc.). The law applicable to the divorce depends on Rome III (law of habitual residence, failing that common nationality, failing that the law of the forum). Property division, compensatory allowance and child custody may follow different rules. An early analysis is essential to choose the most favourable forum.
If you are arrested in France on the basis of a Luxembourg European arrest warrant (or vice versa), a fast procedure begins: hearing before the indictment chamber of the Court of Appeal within 5 days, decision on surrender within 60 days (extendable to 90). Grounds for refusal are limited (article 695-22 ff. of the French Code of Criminal Procedure). An effective defence requires immediate action on both sides of the border — which dual admission makes possible.
The principle of a written fee agreement is common to both Bars. Pricing practices differ slightly (Luxembourg uses time-based billing more often; France relies more on fixed fees with success fees). For a cross-border file, a single agreement is set up at the start of the mission, covering French and Luxembourg acts under a clear scale. Legal aid is accepted in France; in Luxembourg, judicial assistance follows its own resource conditions.
The first consultation is free. It allows the cross-border dimension to be assessed, the appropriate court to be identified and a single strategy to be set for both countries.