How German Courts Apply Foreign Law: Practical Guide for Cross‑border Commercial Disputes (2026)

Foreign law in Germany is a decisive strategic issue for any company litigating a cross‑border commercial dispute where a contract, tort, or transaction touches more than one legal system. Following the entry into force of the Act to Strengthen Germany as a Place for Commercial Litigation (Justizstandort‑Stärkungsgesetz) in 2025, German states may establish dedicated Commercial Courts (Commercial Courts) and Commercial Chambers (Commercial Chambers) at which proceedings can be conducted in English, and the practical question for in‑house counsel and litigators is no longer only which law governs, but how to prove it quickly and defensibly before a German court.

This guide takes a clear position: German courts will apply foreign law where the conflict rules require it, but the party relying on that law must be prepared to help prove its content, and success turns on preparation, expert evidence, and disciplined procedural tactics. Below you will find the statutory framework, a decision framework, a side‑by‑side comparison, and model wording you can adapt for your next matter.

TL;DR, If you only read one thing

• German courts do apply foreign law. Rome I governs contractual obligations, Rome II governs non‑contractual ones, and the EGBGB supplies Germany’s residual conflict rules.
• The court must ascertain the content of foreign law, but in practice the parties should supply the material. This is done through expert opinions, statutory texts, and translations, with the court free to investigate under the German Code of Civil Procedure (ZPO).
• A clear choice‑of‑law clause is your strongest asset. It is enforced unless it conflicts with overriding mandatory provisions or consumer protections.
• Prepare expert evidence early. Weak proof risks the court falling back on German substantive law.
• The 2025 reform helps. Where a state has established them, Commercial Chambers and Commercial Courts can permit proceedings in English, which can speed review of foreign‑law submissions, a factor worth weighing in forum selection.

Who this is for: in‑house counsel, general counsel, and commercial litigators deciding forum or preparing litigation in Germany where foreign law may apply. The goal: decide whether Germany is a good forum, then follow a practical checklist to prove foreign law quickly and defensibly.

When and how German courts apply foreign law, the statutory framework

Understanding how foreign law in Germany is triggered begins with the sources of conflict‑of‑law rules. German courts do not simply apply German substantive law to every case that lands in a German courtroom. Where a dispute has a genuine international element, the court first determines the applicable law using EU regulations and the German Introductory Act to the Civil Code (EGBGB), and only then applies the substantive rules of that law to the merits.

Primary legal sources: EGBGB, Rome I, and Rome II

Three instruments do the heavy lifting. For contractual obligations, Regulation (EC) No 593/2008 (Rome I) governs, giving strong effect to the parties’ choice of law. For non‑contractual obligations, tort, delict, unjust enrichment, culpa in contrahendo, Regulation (EC) No 864/2007 (Rome II) applies. Where neither EU regulation covers the issue, the EGBGB supplies Germany’s autonomous conflict rules. Together, these determine whether foreign law in Germany will govern the substantive questions in your dispute.

Distinguishing contract from tort and other obligations

Characterisation matters enormously. A claim framed as breach of contract falls under Rome I, where party autonomy dominates. The same underlying facts framed as a tort claim fall under Rome II, where the applicable law is generally the law of the country in which the damage occurs, subject to the exceptions and connecting factors set out in the Regulation, and regardless of any contractual choice unless the parties have agreed otherwise as Rome II permits. Because the outcome can differ depending on how a claim is characterised, litigators should assess characterisation early: it changes both which law applies and what you must prove.

German public policy and overriding mandatory provisions

Even a validly chosen foreign law is not absolute. German courts will refuse to apply foreign law where doing so would be manifestly incompatible with German public policy (ordre public), and they will apply German overriding mandatory provisions regardless of the chosen law. The EGBGB and Rome I both recognise these limits. In commercial practice this most often surfaces in consumer contracts, employment relationships, and regulated sectors, areas where a choice of foreign law cannot displace protective mandatory rules.

Can German courts apply foreign law, for example French law? Yes. In a commercial contract between a German and a French company that selects French law, a German court will apply French substantive law to the merits. The court is responsible for ascertaining and applying the conflict rule and the content of the chosen law, but in practice the party relying on French law should supply the material proving its content.

Choice‑of‑law clauses, enforceability and procedural treatment

A well‑drafted choice‑of‑law clause is the single most cost‑effective way to control which substantive law a German court will apply. Rome I enshrines party autonomy: parties to a commercial contract may choose the governing law, and German courts will respect that choice as a matter of course.

Rome I and party autonomy

Under Rome I, an express choice of law is presumptively valid and binding for business‑to‑business contracts. The chosen law need not have any connection to the parties or the transaction. However, the presumption can be defeated: a clause may be disregarded where it conflicts with consumer‑protection rules, or where German overriding mandatory provisions apply. For purely domestic situations with only a foreign‑law veneer, a choice of foreign law cannot escape the mandatory rules of the sole connected country.

Drafting pitfalls and recommended redlines

Most disputes over choice‑of‑law clauses arise from sloppy drafting, not from legal invalidity. Common failures include:

• Ambiguous wording. A clause referring vaguely to “the laws applicable to the parties” invites re‑characterisation. Specify the jurisdiction by name, for example, “the laws of the Federal Republic of Germany” or “French law”.
• Silent governing language. In a bilingual contract, specify which language version prevails to avoid interpretive disputes downstream.
• Referential or floating clauses. Clauses that incorporate the law of a shifting connecting factor create uncertainty; prefer a fixed, exclusive choice.
• No fallback. Include a fallback provision in case the primary choice is held invalid in part.

Procedural posture: what to plead and when

Under German procedure you should plead the clause and produce the contract containing it, ideally in your statement of claim or defence. Raise the clause early, particularly if jurisdiction or applicable law is contested. Delaying the point can undermine your position if the opponent argues lateness. Attach the contract, identify the operative clause, and set out the connecting factors supporting its application.

Does a contractual choice‑of‑law clause bind German courts? For commercial contracts, yes, under Rome I the court will give effect to the parties’ chosen law unless the clause is invalid or displaced by overriding mandatory rules or public policy. The court is bound to respect a valid, unambiguous choice.

Burden and procedure for proving foreign law in German courts

This is where matters involving foreign law in Germany are often won or lost. Determining the applicable law is the court’s job; ascertaining the content of that law is formally also the court’s duty, but in practice the parties supply most of the material. Litigators who treat proof of foreign law as an afterthought risk the court applying German law by default.

The court’s duty and the parties’ role

Section 293 of the German Code of Civil Procedure (ZPO) provides that foreign law must be ascertained by the court, which may use sources beyond those offered by the parties and may investigate ex officio. In practice, however, the court expects the parties, especially the party relying on the foreign law, to supply the material, and the court may commission its own expert. The realistic position for practitioners is straightforward: if you rely on foreign law, treat the practical burden of supplying proof as yours. Establish both that the foreign law applies and precisely what it provides on the disputed points.

Typical evidence types

To establish the content of foreign law before a German court, parties typically rely on:

• Foreign legal opinions. Written opinions from a qualified lawyer or academic in the relevant jurisdiction, addressing the specific outcome‑determinative questions.
• Translations. Translations of the foreign statutes, regulations, and leading decisions relied upon, certified where appropriate.
• Expert reports. Formal reports where doctrine is contested or case‑law dependent, such as French law.
• Statutory and case‑law extracts. Authoritative texts you supply yourself to narrow the expert’s task and reduce cost.
• Institutional channels. Where appropriate, information obtained through official channels, including under the European Convention on Information on Foreign Law (London Convention), or institutions specialising in comparative law.

Judicial notice is limited

German judges are not presumed to know foreign law. While a court may take account of its own knowledge or commission an expert, the safe assumption for practitioners is that the court will decide largely on the strength of the material the parties present. If proof is weak or contradictory, the court may resolve the point against the party relying on the foreign law, and in some circumstances fall back on German substantive law where the content of the foreign law cannot be ascertained despite reasonable efforts. That fallback risk is the single strongest argument for investing in robust proof early.

Timing and efficiency

When you file expert evidence is a tactical decision. Filing an expert opinion with the initial pleadings signals confidence, frames the applicable‑law debate on your terms, and gives the court time to digest complex foreign doctrine. In urgent matters, provisional relief, or a forum‑selection argument, a lighter “proof package” (a concise legal memo plus authoritative statutory texts) may be enough to secure an early ruling, with a fuller opinion to follow. Where a Commercial Chamber or Commercial Court permits English, an English executive summary of a foreign opinion can materially speed judicial review.

How do you prove foreign law in German court proceedings? Identify the outcome‑determinative questions, instruct a qualified expert in the relevant jurisdiction, produce the expert opinion together with translations of the key texts, plead the applicable law clearly, and file early, before or with your pleadings where possible.

Practical preparation checklist and timeline for proving foreign law

The difference between a smooth and a painful case involving foreign law in Germany is preparation. The following checklists convert the legal framework into concrete steps.

Pre‑litigation and forum‑selection checklist

• Confirm whether a valid choice‑of‑law clause exists and whether it is likely to be challenged.
• Characterise the claim: contract (Rome I), tort or other non‑contractual obligation (Rome II), or a mix.
• Assess whether German overriding mandatory rules or public policy could displace the chosen law.
• Weigh Germany’s forum advantages, procedural efficiency and, where a state has established them, Commercial Courts and English‑language proceedings, against the cost of proving foreign law.
• Scope the expert evidence you will need and obtain preliminary fee estimates.

Litigation checklist

• Evidence gathering. Collect the contract, correspondence establishing the connecting factors, and the foreign statutes and cases relevant to the disputed points.
• Expert selection. Choose an expert with recognised standing in the relevant jurisdiction and, ideally, experience giving evidence before German courts.
• Instructions. Instruct the expert on precisely defined questions, avoid open‑ended briefs that inflate cost and dilute focus.
• Translations. Arrange translations of all foreign texts relied upon, plus an executive summary for the court.
• Filing strategy. Decide whether to file the full opinion with pleadings or lead with a lighter package for an early ruling.
• Joint statements. Where feasible, agree the undisputed points of foreign law with the opponent to narrow the issues for the court.

Costs and budgeting

Proving foreign law is a moderate‑to‑high incremental cost, driven principally by expert fees, translation, and, where the court commissions its own expert, additional court‑related costs. You can reduce this materially by:

• Narrowing the legal questions put to the expert to only the outcome‑determinative points.
• Supplying authoritative statutory texts and translations yourself, so the expert focuses on analysis rather than research.
• Agreeing statements of undisputed law with the other side to eliminate uncontested issues.
• Requesting a limited preliminary indication on the applicable law before incurring the full cost of a comprehensive merits opinion.

What practical steps should parties take to prepare evidence and expert opinion on foreign law for German courts? Characterise the claim, confirm the applicable law, select and tightly instruct a qualified expert, obtain translations with an executive summary, agree undisputed points where possible, and file early to control the applicable‑law debate.

Special considerations: French law and bilingual litigation tips

Franco‑German disputes are among the most common cross‑border matters involving foreign law in Germany, and French law raises distinctive proof challenges that reward specialist handling.

Common pitfalls when proving French law

French law is codified, but its practical operation is heavily shaped by case law and doctrine. A translation of the relevant Code articles alone rarely tells the full story. German courts encountering French law need to understand how the courts and commentators interpret the codified text, which is why a formal expert opinion, rather than a bare statutory extract, is usually advisable where French doctrine is outcome‑determinative. Do not assume that the literal wording of a Code article resolves the point; explain the jurisprudential gloss.

Bilingual practical tips

• Produce the French legal opinion in French, accompanied by a German translation of the operative conclusions.
• Where the Commercial Chamber or Commercial Court permits English, add a concise English executive summary to accelerate the court’s review.
• Cross‑reference French doctrine to any comparable German concept to help the court orient itself.
• For contracts, use bilingual clause wording and specify the prevailing language version to pre‑empt interpretive disputes.

A typical Franco‑German scenario

Consider a supply contract between a German manufacturer and a French distributor governed by French law, with a dispute over termination. The German‑seated claimant should plead French law as the governing law, produce a French‑law expert opinion on the termination provisions with translations, and, if the court allows English, attach an English summary. Framing the questions to the expert narrowly (for example, the specific conditions for lawful termination under the relevant Code provisions and the leading decisions interpreting them) keeps the opinion focused and the cost contained.

Comparison and decision framework: how to handle foreign law in Germany

The centrepiece of any strategy on foreign law in Germany is the choice between relying on a contractual choice‑of‑law clause (Route A) and preparing to prove foreign law before the court on the merits (Route B). The table below sets the two routes side by side.

Decision framework, choose one

• Choose A (rely on a clear choice‑of‑law clause) when you can negotiate the contract terms; the parties want certainty of substantive law; the contract does not involve consumers or other protected parties; and you can draft an unambiguous clause specifying the law, the governing language, and fallbacks. This is the lower‑cost, higher‑predictability route and should be the default whenever you control the drafting.
• Choose B (prepare to prove foreign law) when there is no clause, the clause is ambiguous or challenged, or the claim sounds in tort or another non‑contractual area governed by Rome II or the EGBGB, or when you positively prefer Germany for its procedural advantages and are willing to absorb the extra expert cost.
• Choose the hybrid approach when a clause exists but may be challenged. Prepare expert evidence on foreign law in parallel, a low‑cost confirmatory memo now, upgraded to a full opinion if the clause is contested, so that a successful challenge does not leave you scrambling to prove the merits.

Worked example one: Two well‑advised commercial parties negotiating a fresh contract with a clear French‑law clause should rely on Route A, plead and produce the clause, and reserve full expert evidence unless the clause is attacked. Worked example two: A German claimant suing on a cross‑border tort with no contractual relationship should proceed on Route B from the outset, Rome II will fix the applicable law, and the claimant must be ready to help prove its content with expert evidence filed alongside the pleadings.

Sample procedural wording and templates

Precise, reusable wording saves time and reduces the risk of procedural missteps when handling foreign law in Germany. The following elements should feature in your pleadings and instructions.

Preserving the choice of law in pleadings

In the statement of claim or defence, state clearly that the contract at Exhibit [X], Clause [Y], contains an express and exclusive choice of [named] law under Rome I; identify the connecting factors; and request that the court apply that law to the substantive issues. Where jurisdiction is also contested, address it in the same submission to avoid a lateness objection.

Requesting expert determination of foreign law

Where the content of foreign law is disputed, invite the court to determine the applicable foreign law on the basis of the expert opinion submitted, and, if the court considers it necessary, to commission a court‑appointed expert under § 293 ZPO. Offer to supply translations of all statutes and decisions relied upon to assist the court.

Model instruction to a foreign‑law expert, key elements

• State the specific, closed questions the expert must answer, tied to the outcome‑determinative issues.
• Identify the statutes, regulations, and decisions the expert should address.
• Require the expert to explain both the codified rule and its interpretation in case law and doctrine.
• Ask for a clear conclusion on each question, and a short executive summary suitable for the court.
• Specify the language(s) of the opinion and the requirement for translation of operative parts.

Model expert‑CV requirements

• Qualification and current standing to practise or teach in the relevant jurisdiction.
• Demonstrated expertise in the specific area of law at issue.
• Prior experience giving evidence on foreign law before courts, ideally German courts.
• A statement of independence and absence of conflicts.

Conclusion: a clear position on foreign law in Germany

The honest, actionable answer on foreign law in Germany is this: Germany is a strong forum for cross‑border commercial disputes, and its courts will apply the foreign law the conflict rules require, but only if its content can be reliably ascertained, which in practice means you must help prove it. Wherever you control the contract, lock in certainty with a clear, exclusive choice‑of‑law clause under Rome I. Wherever you must litigate the merits under foreign law, invest early in a tightly instructed expert, translations, and a filing strategy that frames the applicable‑law debate on your terms. Treat proof of foreign law as a first‑order task, not an afterthought, and use the hybrid approach whenever a clause might be challenged.

For tailored Franco‑German assistance, model expert instructions, and bilingual drafting support, contact us through Global Law Experts.

This content is for general information and does not constitute legal advice. Seek tailored advice for your specific matter.

Sources

1. Gesetze im Internet, Zivilprozessordnung (ZPO)
2. Gesetze im Internet, Einführungsgesetz zum Bürgerlichen Gesetzbuche (EGBGB)
3. EUR‑Lex, Regulation (EC) No 593/2008 (Rome I)
4. EUR‑Lex, Regulation (EC) No 864/2007 (Rome II)
5. Bundesgerichtshof (German Federal Court of Justice)
6. Max Planck Institute for Comparative and International Private Law (MPIPRIV)
7. Bundesministerium der Justiz (BMJ)
8. German Federal Bar (Bundesrechtsanwaltskammer, BRAK)