Revision of Chapter 12 of the Swiss Private International Law Act (PILA): Setting the Ground for Trust Arbitration in Switzerland?

18 septembre 2019 By Werner Jahnel, Roman Huber

This article appeared in the ILO’s Private Client and Offshore Services August Newsletter


While trusts have not been incorporated into the Swiss legal system, Switzerland ratified the Hague Trust Convention with effect from 1 July 2007 and adapted its conflict of laws provisions, in particular Articles 149a-149e of the Swiss Private International Law Act (PILA). As a result, foreign trusts are fully recognized and implemented under Swiss law. Although discussed controversially, legislative initiatives to introduce trusts into the law in Switzerland are ongoing.

More recently,several litigation cases involving high value, complex trust structures have been brought before Swiss civil courts in public proceedings.[1] This trend can be explained by the fact that settlors, beneficiaries and trustees from non-trust jurisdictions are less willing to rely on the courts located in trust jurisdictions and foreign procedural rules. Considering the general advantages of arbitration, there is also significant potential for and interest in arbitration proceedings relating to trust matters in Switzerland. Contrary to litigation proceedings before state courts, parties to arbitration proceedings can agree on the level of confidentiality that all involved parties are to maintain. More specifically, the settlor may also state in the arbitration clause contained in the trust instrument that any dispute in connection with a trust arbitration shall be confidential. Another advantage of the enhanced flexibility of arbitration is that parties may choose specialized arbitrators and adapt the proceedings in accordance with their needs. Furthermore, the New York Convention (NYC)[2] assists in ensuring that arbitral awards are recognized and enforced in 159 jurisdictions in a relatively straightforward manner.

Although Switzerland’s long-standing tradition in international arbitration and its importance as a center for trust services would make it a perfect venue for trust arbitration, there are still some legal hurdles to overcome. One of these hurdles has now been addressed – at least on its face – in the draft bill for the revised Chapter 12 of the PILA, the lex arbitri for international arbitration proceedings in Switzerland, published on 24 October 2018 together with its supplementary report.[3] The proposed revision of Chapter 12 of the PILA, which has yet to be debated and voted on in parliament and is not expected to enter into force before 2021,[4] on its face appears to lay the foundations for trust arbitration in Switzerland. However, as we will see below, the draft bill leaves certain key questions unanswered.


The envisaged revision of Chapter 12 PILA seeks to modernize Swiss arbitration law in order to further strengthen the attractiveness and competitiveness of Switzerland as an internationally recognized arbitration venue.

The key amendments of the PILA relevant to trust disputes may be summarized as follows:

The formal requirements for arbitration agreements, set forth in Article 178 PILA, will be modernized. Similar to the form requirements for domestic arbitration[5], the draft bill provides that the arbitration agreement must be made in writing or in any other form which allows it to be evidenced by text (e.g. email or any other form of modern communication).

More importantly, the draft proposal appears to open up the possibility of validly including an arbitration agreement in unilateral legal transactions, such as wills, bylaws or trust deeds. This is achieved by means of a newly proposed Article 178(4) PILA, which specifically provides that the provisions of Chapter 12 PILA shall apply mutatis mutandis to an arbitration clause contained in a unilateral legal transaction or in articles of incorporation.


The introduction of the newly proposed article 178(4) is of particular interest from the viewpoint of trust arbitration. Indeed, this provision could well lay the foundation for the settlement of trust disputes in Switzerland by allowing such disputes to be submitted to a Swiss arbitral tribunal by means of a unilateral arbitration clause included in the trust deed.

Notwithstanding the prospective permissibility of unilateral arbitration clauses under Swiss arbitration law, attention should be drawn to a few not yet entirely resolved issues in the context of trust arbitration.

The proposed revision only clarifies the requirements as to the formal validity of an arbitration clause. The proposed new Article 178 (4) Draft-PILA provides that Chapter 12 PILA will apply “by analogy with regard to an arbitration clause contained in unilateral legal transactions[6]. Accordingly, the formal validity of the arbitration clause in writing which is contained in a unilateral act (e.g. in a trust deed) is confirmed under the revised Swiss lex arbitri. Further conditions, such as the signature of all parties to the future arbitration proceedings, is not required.

The draft proposal, however, does not alter the existing requirements with regard to the substantive validity of an arbitration clause which must also apply to an arbitration clause contained in a unilateral legal transaction. Under existing Swiss arbitration law, the substantive validity of an arbitration clause will be determined under the more favourable of the following laws: the law applicable to the arbitration agreement chosen by the parties (if any); the applicable substantive law (in particular the law applicable to the principal contract); or Swiss law (cf. Article 178 (2) PILA). If the applicable law were to prohibit unilateral arbitration agreements or to provide that arbitration clauses in a trust deed are invalid, then it may still be that – in application of the in favorem validitatis principle described above – the arbitration clause would still be considered valid as a matter of Swiss law. This question, namely whether – and under what circumstances – a unilateral arbitration clause contained in a trust deed can bind other actors, such as beneficiaries, remains unanswered under Swiss law and remains to be further analysed and clarified.

This is confirmed by the draft explanatory note in the report of 24 October 2018 which states that the jurisdiction of an arbitral tribunal can be provided for in a formally valid arbitration clause contained in a unilateral legal transaction such as a will or a trust deed, if this unilateral legal transaction is made in accordance with the applicable law.

The Swiss Federal Tribunal allows the extension of arbitration agreements to non-signatories under particular circumstances. More specifically, this may be the case where a non-signatory party is involved in the performance of a contract and shows, by its conduct, that it intends to be a party to the agreement and the arbitration clause as well as in the case of mergers and assignments. In such cases, a form of “consent” on the part of the non-signatory is implied.

A further question that arises is the extent to which an arbitral award issued on the basis of a unilateral arbitration agreement, if such an arbitration agreement were to be considered valid, would be enforceable under the New York Convention. Indeed, Article II (2) NYC provides that “agreement in writing” shall include an arbitral clause in a contract or an arbitration agreement, signed by the parties or contained in an exchange of letters or telegrams.

In a recent decision, the Swiss Federal Tribunal found that the formal requirements of Article II (2) NYC were not a barrier to an extension of the agreement and the arbitration clause contained therein, similar to the decisions rendered under PILA.[7] The impact of this case law in the context of trust arbitration remains to be seen. A particularly interesting question for trust arbitration will be whether third parties who did not sign the trust deed, such as the beneficiaries (even if unborn), could also be deemed to have agreed to a unilateral arbitration clause implemented by the settlor by accepting distributions or invoking any right under the trust deed.


The draft bill for the revision of the Swiss arbitration law, in particular the acceptance of the formal validity of an arbitration clause contained in a (foreign) trust deed, is much welcomed. Settlors who are increasingly concerned about prospects of court proceedings in remote trust jurisdictions will have an additional option in the future and would be able to settle their disputes with trustees and/or beneficiaries in confidential arbitration proceedings based in Switzerland.

Should the draft enter into force in its current version, it should be further clarified whether the trust law as such must provide for the possibility of arbitration in the event that the arbitration clause is contained in a trust deed and the parties to the arbitration have not signed the arbitration clause. In any event, trust practitioners who want to arbitrate in Switzerland must carefully draft their arbitration clauses. They can already today rely on a few model clauses, such as the arbitration clause for trust disputes suggested by the ICC[8], although such clauses do not overcome the requirements of formal and substantive validity under the lex arbitri.

[1] A list of various decisions rendered by the Swiss federal and cantonal courts – including unpublished ones – can be found under <> (last visited 19 July 2019).

[2] United Nations Convention on the Recognition and Enforcement of Foreign Arbitral Awards (New York, 10 June 1958).

[3] Cf. <> (last visited on 19 July 2019).

[4] The draft bill is currently under detailed consideration by the National Council Legal Affairs Committee.

[5] See Art. 358 Swiss Civil Procedure Code.

[6] Art. 178 (4) Draft-PILA: «Für eine Schiedsklausel, die in einem einseitigen Rechtsgeschäft oder in Statuten vorgesehen ist, gelten die Bestimmungen dieses Kapitels sinngemäss.».

[7] Decision 4A_646/2018 (17 April 2019).

[8] Cf. <> (last visited on 19 July 2019).