How Germany's 2026 Arbitration Law Reform Affects Use of the UNIDROIT Principles: Practical Steps for International Contracts

On 10 June 2026 the German Federal Government published its draft “Act on the Modernisation of Arbitration Law” (the Regierungsentwurf), advancing a reform first issued as a ministerial draft on 27 January 2026 and reviving a 2024 proposal that lapsed when the previous coalition collapsed. For contracting teams that select the UNIDROIT Principles of International Commercial Contracts to govern cross-border deals, the reform is worth understanding — though it should be read for what it is. This is a deliberately minor, technical modernisation of Book 10 of the Code of Civil Procedure (ZPO), not a wholesale overhaul: German arbitration law, a well-regarded UNCITRAL Model Law–based system last substantially reformed in 1998, is widely seen to work, and the draft fine-tunes rather than rebuilds it. Its main changes are practical. Revised §1031(1) ZPO relaxes the form requirement for arbitration agreements to a Model Law–style standard — any means of communication that provides a retrievable record, so email, messaging apps and electronic platforms qualify, though purely oral agreements still do not.

The draft also expressly permits virtual hearings and electronic awards, allows certain arbitration-related matters before state courts to be heard in English where an English-language Commercial Court exists, creates a basis for publishing awards in anonymised form, and clarifies the enforcement of tribunal-ordered interim measures. None of these provisions targets the UNIDROIT Principles specifically; the practical link is simply that a relaxed §1031 makes it easier to conclude any arbitration agreement — including one selecting the Principles — by electronic means. This guide sets out the steps in-house counsel and contract managers can take now to keep UNIDROIT-referencing arbitration clauses enforceable and fit for purpose as the bill moves through the legislative process.

Executive Summary: What to Do Now

TL;DR: If your international contract or arbitration clause selects the UNIDROIT Principles and your seat is in Germany, or German court intervention is possible, you must review clause language, confirm seat designation, add digital-evidence provisions, and clarify whether you intend the Principles to serve as governing substantive rules or merely as an interpretive aid. Act before parliamentary readings conclude.

Four immediate actions for contracting teams:

• Audit every live arbitration clause. Identify all contracts where the UNIDROIT Principles are referenced, as lex contractus, as supplementary interpretive rules, or merely in recitals, and flag those with a German seat or German-law procedural fallback.
• Confirm the seat of arbitration. The reform’s digitalisation and court-support provisions apply only where the ZPO governs the arbitral procedure. If your seat is outside Germany, the drafting urgency is lower, but enforcement in Germany still triggers the reformed provisions.
• Add digital acknowledgement language. The draft expands permissible forms for concluding arbitration agreements beyond strict “written” requirements. To eliminate ambiguity during the transition, insert explicit digital-signature and electronic-exchange clauses.
• Clarify choice-of-rules versus choice-of-law. German courts distinguish between choosing a national law and choosing non-statutory “rules of law.” Ensure the clause states unambiguously that the UNIDROIT Principles apply as the parties’ chosen substantive rules, not merely as persuasive authority.

When to Act: Legislative Timeline

Industry observers expect the bill to move to parliamentary debate by mid-2026, meaning any clause signed today will likely be interpreted under the reformed ZPO if a dispute arises in 2027 or later. Waiting is not a viable strategy.

The January 27, 2026 BMJV Draft: What Changed and Why It Matters

Germany has long been one of the world’s leading seats for international arbitration, yet its arbitration statute, Book 10 of the ZPO, had not been substantially updated since 1998. The modernisation of German arbitration law 2026 aims to close that gap. The draft bill addresses procedural digitalisation, form requirements, court support for arbitral proceedings, and several alignment measures with the 2006 amendments to the UNCITRAL Model Law.

Summary of Key Draft Provisions

• Relaxed form requirements for arbitration agreements. The draft expands the permissible means of concluding an arbitration agreement beyond the traditional “written form” requirement. Electronic communications, digital signatures, and other durable media are explicitly recognised, reducing the risk that an arbitration clause agreed by email exchange or on a digital platform is later challenged for non-compliance with form rules.
• Digitalisation of arbitral proceedings. The draft introduces provisions permitting, and in some instances encouraging, virtual hearings, electronic filing, and digital service of documents. For parties relying on the UNIDROIT Principles, this matters because the Principles themselves are silent on procedural digitalisation; the reform fills that gap at the seat level.
• Expanded court support and judicial gatekeeping. German courts gain broader competence to assist arbitral tribunals on specific procedural questions, including the taking of evidence and interim measures. The draft also refines the mechanism by which courts assess the validity of arbitration agreements at the pre-arbitral or enforcement stage, a provision with direct implications for clauses that designate the UNIDROIT Principles as governing rules rather than a national law.
• Alignment with international standards. Several provisions track the 2006 revisions to the UNCITRAL Model Law, strengthening Germany’s position as a top jurisdiction for international arbitration. This alignment benefits parties who combine an UNCITRAL-aligned seat with the UNIDROIT Principles as substantive rules, a configuration common in complex multi-party deals.

Stakeholder Reactions: DIS, Major Firms, and Institutional Commentary

The Deutsche Institution für Schiedsgerichtsbarkeit (DIS), Germany’s foremost arbitration institution, published a detailed statement on 27 February 2026 welcoming the reform’s broad direction but flagging concerns about the scope of expanded court involvement. The DIS emphasised that court assistance must remain subsidiary, tribunals should retain primary authority over procedural conduct.

Leading German law firms published analyses in rapid succession. Gleiss Lutz, in a note dated 17 February 2026, described the draft as “a significant step toward aligning German arbitration practice with modern commercial expectations.” Freshfields, writing on 30 January 2026, framed the bill as Germany’s “renewed push” to compete with London, Paris, and Singapore as an arbitral seat. Neither analysis, however, addressed in depth how the reforms interact with non-statutory substantive rule sets such as the UNIDROIT Principles, an analytical gap this article aims to close.

For a deeper understanding of how the UNIDROIT Principles apply to international commercial contracts generally, see our foundational guide.

How the German Arbitration Reform Interacts with the UNIDROIT Principles in Contract Drafting

The UNIDROIT Principles of International Commercial Contracts, published by the International Institute for the Unification of Private Law (UNIDROIT) in Rome, are a set of general rules for international commercial contracts. They are not a statute, a treaty, or a convention. They do not carry binding force by operation of law. Instead, the Principles derive their authority entirely from party autonomy: they become contractually binding when, and only when, the parties incorporate them by agreement.

This distinction is the starting point for every drafting decision affected by the 2026 reform. German arbitration law (the ZPO) governs the procedural framework, formation of the arbitration agreement, conduct of the proceedings, court support, and enforcement of awards. The UNIDROIT Principles, by contrast, operate at the substantive level, governing the interpretation, performance, and remedies of the underlying commercial contract. The German arbitration reform intersection therefore raises questions at the boundary between procedure and substance.

When UNIDROIT Operates as “Substantive Rules” vs. a “Soft Law” Interpretive Tool

Parties may deploy the UNIDROIT Principles in one of two fundamentally different ways, and the 2026 reform affects each differently:

• As the chosen substantive rules (lex contractus). The parties expressly designate the UNIDROIT Principles as “the rules governing the contract.” In arbitration seated in Germany, tribunals will apply the Principles directly. German courts, if asked to review the award (e.g., under § 1059 ZPO on setting aside), will treat the Principles as the parties’ chosen framework, but will still apply German mandatory rules and public policy (ordre public) as an outer limit. The 2026 draft does not change this baseline, but the expanded court-support provisions mean courts may more frequently encounter questions about how to interpret the Principles alongside German procedural rules.
• As interpretive guidance (“soft law”). The parties choose a national governing law (e.g., German law or Swiss law) but reference the UNIDROIT Principles as supplementary interpretive authority. In this configuration, the Principles serve as persuasive rather than binding authority. Tribunals may draw on them to fill gaps or to interpret contractual terms in light of international trade usages, a function the Principles’ drafters explicitly envisaged. The 2026 reform has less direct impact here, but the principle of iura novit curia in international arbitration becomes relevant: can the tribunal apply UNIDROIT provisions the parties did not specifically invoke?

Scenarios Where the Reform Might Change Tribunal or Court Treatment

The likely practical effects of the reform on UNIDROIT-based clauses fall into several categories:

Early indications suggest the reform will not undermine the enforceability of UNIDROIT-based clauses, but the expanded judicial toolkit creates new surface area for challenge. Well-drafted clauses that anticipate court interaction will perform significantly better than generic boilerplate.

Practical Drafting and Contract Clauses: Step-by-Step Templates for Drafting an Arbitration Clause in Germany

Below are four model clause templates, annotated with explanatory commentary, designed for contracts that combine a German seat (or potential German enforcement) with the UNIDROIT Principles. Each template addresses specific risks raised by the 2026 draft. These templates are starting points; they should be adapted to the transaction’s complexity, the parties’ bargaining positions, and institutional arbitration rules (e.g., DIS, ICC).

Template A: German Seat with UNIDROIT Principles as Substantive Rules

“All disputes arising out of or in connection with this contract shall be finally resolved by arbitration under the [DIS/ICC] Rules. The seat of arbitration shall be [Frankfurt/Hamburg/Munich]. The substantive rights and obligations of the parties under this contract shall be governed by the UNIDROIT Principles of International Commercial Contracts (2016 edition, or any subsequent edition in force at the date of the arbitration request). The arbitral procedure shall be governed by the law of the seat (German law, ZPO Book 10). This clause constitutes a valid arbitration agreement within the meaning of § 1029 ZPO, whether concluded in writing, by electronic communication, or by any other durable medium.”

Why this works: The clause separates substantive rules (UNIDROIT) from procedural law (ZPO) explicitly, pre-empts form challenges by referencing the draft’s expanded permissible media, and designates the Principles as binding lex contractus rather than soft law.

Template B: Neutral Seat with UNIDROIT Principles (German Enforcement Anticipated)

“All disputes arising out of or in connection with this contract shall be finally resolved by arbitration under the [ICC/LCIA/SCC] Rules. The seat of arbitration shall be [Paris/Zurich/Stockholm]. The substantive rights and obligations of the parties shall be governed by the UNIDROIT Principles of International Commercial Contracts (2016 edition). The parties acknowledge that enforcement of any award may be sought in Germany and agree that nothing in this clause shall be interpreted as conflicting with the form requirements of German arbitration law, including as amended.”

Why this works: It anticipates enforcement under §§ 1060–1061 ZPO by explicitly confirming compatibility with German form rules. This reduces the risk that a losing party argues the clause fails German form requirements at the recognition stage.

Template C: Fallback Clause if Courts Require a National Governing Law

“The substantive rights and obligations of the parties shall be governed by the UNIDROIT Principles of International Commercial Contracts (2016 edition). To the extent any court or tribunal determines that a national governing law must be identified, the parties agree that [German law / Swiss law / English law] shall apply as a subsidiary governing law, supplemented and interpreted in light of the UNIDROIT Principles.”

Why this works: Some courts, particularly at the enforcement stage, may question whether non-statutory “rules” satisfy the requirement for a governing law under conflict-of-laws rules. The fallback provides a safety net without surrendering the parties’ primary intent.

Template D: Digital Acknowledgment and Evidence Clause

“The parties confirm that this arbitration agreement has been concluded [by exchange of electronic communications / via the digital contracting platform [name] / by electronic signature conforming to eIDAS Regulation standards]. Each party acknowledges receipt of and consent to the arbitration clause in a durable medium. This confirmation satisfies the form requirements of § 1031 ZPO as amended.”

Why this works: The 2026 draft relaxes the strict “written” requirement, but during the legislative transition period, the precise scope of acceptable electronic forms may be debated. This clause creates a contemporaneous evidentiary record of consent, critical if a party later challenges the agreement’s validity.

Essential Checklist for Every UNIDROIT-Referencing Arbitration Clause

• Seat of arbitration: Explicitly stated (city and country).
• Institutional rules: Named (DIS, ICC, LCIA, or ad hoc under UNCITRAL Rules).
• Substantive rules: UNIDROIT Principles identified by edition, described as “governing” or “applicable to the substantive rights and obligations.”
• Procedural law: Stated separately from substantive rules (e.g., “the arbitral procedure shall be governed by the law of the seat”).
• Form compliance: Digital acknowledgement language included.
• Fallback governing law: Included (especially for enforcement-sensitive jurisdictions).
• Language of arbitration: Specified.
• Number of arbitrators: Specified or mechanism for determination included.
• Interim measures: Express preservation of both tribunal and court jurisdiction.
• Interpretation clause: Statement that the UNIDROIT Principles shall be interpreted autonomously, not by reference to any single national legal tradition.

Court Interaction, Interim Measures, and Enforceability of UNIDROIT in Arbitration Under the 2026 Draft

The 2026 draft enhances the role of German courts as support actors in arbitral proceedings. For parties whose contracts are governed by the UNIDROIT Principles, this creates both opportunities and risks.

Interim Measures and Urgent Relief

Under the draft, courts may grant interim measures in support of arbitration more readily, including before the tribunal is constituted. Where the underlying contract is governed by the UNIDROIT Principles, the court may need to assess the merits of the substantive claim (e.g., whether a prima facie breach has occurred) by reference to those Principles. This means German judges may increasingly encounter the UNIDROIT framework in urgent applications.

To preserve maximum flexibility, the arbitration clause should expressly state that both the tribunal and the courts of the seat (and, where different, the courts at the place of enforcement) have concurrent jurisdiction to order interim measures. The clause should also confirm that an application to a court for interim relief does not constitute a waiver of the right to arbitrate, a provision already standard in most institutional rules but worth reinforcing in the contract itself.

Enforceability Checklist Before Selecting UNIDROIT in Your Clause

Before designating the UNIDROIT Principles as governing rules, in-house counsel should confirm the following:

1. The seat of arbitration permits the application of “rules of law” (not only national law) as the substantive standard. Germany does; many other major seats do as well.
2. The institutional rules chosen (DIS, ICC, etc.) authorise the tribunal to apply “rules of law” chosen by the parties. Article 21(1) of the ICC Rules and § 23.1 of the DIS Rules both permit this.
3. The likely jurisdictions of enforcement recognise awards based on non-national rules. Under the New York Convention, enforcement courts review awards for public policy compliance, not for correctness of substantive law application. The UNIDROIT Principles have been applied and enforced globally.
4. Mandatory rules of relevant jurisdictions (e.g., consumer protection, competition law, sanctions compliance) have been identified and accounted for. The UNIDROIT Principles cannot override mandatory law.
5. The clause includes a fallback national law in case a court insists on identifying one.

For practical guidance on hearing preparation once a dispute arises, see our overview of the preparation for and conduct of arbitration hearings.

UNIDROIT vs German Law: Quick Comparison Table

Key takeaway: The UNIDROIT Principles and German law are complementary, not conflicting, when deployed correctly. The 2026 reform does not create incompatibility, but it does create new procedural touch points where courts may examine the interaction between the two. Precise drafting eliminates the risk.

Conclusion: Annotated “Must-Do” Checklist for the German Arbitration Reform and its Effects on UNIDROIT Principles in 2026

The modernisation of German arbitration law 2026 is a positive development for Germany as an arbitral seat and for parties who value the UNIDROIT Principles as a neutral, internationally oriented governing framework. The reform does not diminish the Principles’ utility, but it does require contracting teams to sharpen their drafting to account for relaxed form rules, expanded court support, and the transitional period before the bill’s final text is settled.

The following ten-point checklist summarises the essential actions:

1. Confirm the seat of arbitration and state it explicitly in the clause (city and country).
2. Separate substantive rules from procedural law, never rely on a single “governing law” clause to cover both.
3. Designate the UNIDROIT Principles by edition (2016 or any successor) and describe them as “the rules governing the substantive rights and obligations of the parties.”
4. Include a fallback national governing law to address enforcement scenarios where a court requires one.
5. Add digital-acknowledgment language confirming the form of conclusion (electronic signature, email exchange, platform consent).
6. Preserve concurrent interim-measure jurisdiction for both the tribunal and the courts of the seat.
7. Specify the institutional rules (DIS, ICC, LCIA, UNCITRAL) and confirm they permit application of “rules of law.”
8. Identify mandatory rules of all relevant jurisdictions and confirm the clause does not purport to override them.
9. Include an autonomous-interpretation clause stating that the UNIDROIT Principles shall be interpreted by reference to their own framework, not any single national legal tradition.
10. Monitor the legislative timeline, subscribe to updates from the BMJV, DIS, and specialist counsel to track amendments during parliamentary passage.

For background on how arbitration awards are recognised and enforced, consult our dedicated resource.

Sources

1. UNIDROIT, International Institute for the Unification of Private Law
2. Deutsche Institution für Schiedsgerichtsbarkeit (DIS), Statement on the Draft Bill for the Modernisation of Arbitration Law (27 February 2026)
3. Gleiss Lutz, Modernization of German Arbitration Law: Draft Bill Published (17 February 2026)
4. Freshfields, Back on the Agenda: Germany’s Renewed Push to Modernise Its Arbitration Law (30 January 2026)
5. Global Law Experts, Applying UNIDROIT Principles to Regulate International Commercial Contracts