Sole Arbitrator or Three-Member Tribunal at VIAC: Choosing the Number and Cost Risk

Sole arbitrator or three-member tribunal at VIAC: choosing the number and cost risk is not merely an administrative detail. If the arbitration agreement does not clearly state the number of arbitrators, the constitution of the tribunal can affect procedure, decision-making and the advance on costs.

The Vienna Rules distinguish between a sole arbitrator and a panel of three arbitrators. If the parties have not agreed on the number, the VIAC Board considers the complexity of the case, the amount in dispute and the parties’ interest in an expeditious and cost-efficient decision.

The right question is therefore not which constitution is generally “better”. The relevant factors are the dispute structure, economic importance, breadth of the decision required and the ability to fund the higher advance associated with a three-member tribunal.

What Article 17 of the Vienna Rules decides

The parties may agree whether the dispute will be decided by a sole arbitrator or by a panel of three arbitrators. They may also agree on the appointment method. If that agreement is missing, Article 17 paragraph 2 of the Vienna Rules supplies the decision rule.

The Board considers the complexity of the case, the amount in dispute and the parties’ interest in an expeditious and cost-efficient decision. The Vienna Rules do not set a rigid monetary threshold at which three arbitrators become mandatory. A useful submission must therefore explain the dispute, not merely state a number.

When a sole arbitrator may fit the dispute

A sole arbitrator may be suitable where the dispute is focused, the evidence is limited and the decision can be framed around a defined set of legal and factual issues. A single decision-maker can simplify coordination and keep the procedure concentrated. It does not guarantee a faster result.

The person appointed remains important. Expertise, independence, availability, potential conflicts and the language and technical demands of the case require careful review. A sole arbitrator is therefore not automatically the cheaper or tactically preferable option.

When a three-member tribunal may be appropriate

A three-member tribunal may be appropriate where several contracts interact, the evidence is extensive or the legal and technical questions require a broader deliberation. Significant economic exposure may also support that structure. It still does not replace a close review of the arbitration agreement and the claims.

In a panel, each party generally nominates one arbitrator. The co-arbitrators jointly nominate the chairperson. If a nomination is not made in time, the Board may make the outstanding appointment. The additional coordination should be included in the procedural plan.

Nominations and 30-day deadlines at VIAC

For a sole arbitrator, the Secretary General asks the parties to nominate one person jointly within 30 days. If they do not make the joint nomination in time, the Board appoints the arbitrator. For a three-member tribunal, each party nominates its arbitrator and the co-arbitrators nominate the chairperson, with the relevant nominations generally due within 30 days after the request.

The deadline is therefore not a mere formality. The arbitration agreement, request for arbitration, answer, service record and VIAC request must be read together. Multi-party proceedings add a further point: the claimant side and respondent side jointly nominate their arbitrator. Under Article 18 paragraph 3, taking part in that joint nomination does not by itself amount to consent to multi-party arbitration.

How the tribunal choice affects cost exposure

VIAC costs are not determined by the number of arbitrators alone. Article 42 provides for an advance covering administrative fees, arbitrators’ fees and prospective expenses. In principle, the parties pay the advance in equal shares before the file is transmitted to the tribunal. The amount in dispute and the scope of claims and counterclaims affect the calculation.

For arbitrator fees, Article 44 paragraph 8 gives a clear comparison: the total fee for a panel is two and a half times the rate for a sole arbitrator. This is not a complete forecast of procedural costs, but it shows the scale of the constitution risk. Administrative fees, expenses, VAT, party costs and additional procedural steps may come on top.

If one party does not pay its share of the advance, the other side may, to protect the proceedings, pay the outstanding amount. That does not erase the non-paying party’s obligation. Under the Vienna Rules, the tribunal may order reimbursement where the conditions are met, while the final allocation of costs is determined later under Article 38 and may take the conduct of the parties and their representatives into account.

Documents needed before the constitution decision

The review should include the complete arbitration agreement, all amendments, the amount of each claim, a clear account of the legal and factual issues and the expected evidence. Where several contracts are involved, it should be possible to see whether the same parties and disputes are covered.

It is also useful to record the intended procedural language, the number of parties and the commercial time pressure. Where the clause is unclear, the article on appointing an arbitrator under an unclear clause provides a related focus. For preparing the filing, see the article on a VIAC request for arbitration, clause, dispute scope and cost exposure.

Do not confuse constitution with other issues

The choice between a sole arbitrator and a three-member tribunal concerns the number and formation of the tribunal. It does not decide whether a particular arbitrator should be challenged, whether a mandate ends prematurely or whether the tribunal has jurisdiction. Those questions are governed by separate provisions and cannot be replaced by a cost calculation.

Nor does a three-member tribunal promise a better decision on the merits. Conversely, a sole arbitrator is not automatically unsuitable because the amount in dispute is high. The constitution must fit the agreement, the structure of the case and the realistic financing of the arbitration.

Common questions on the VIAC tribunal

Who decides at VIAC if the arbitration agreement leaves the number open?

Under Article 17 paragraph 2 of the Vienna Rules, the Board decides whether the dispute will be heard by a sole arbitrator or a three-member tribunal. It considers complexity, amount in dispute and the interest in an expeditious and cost-efficient decision.

Is a three-member tribunal automatically two and a half times as expensive?

Article 44 paragraph 8 states that the arbitrator fees for a panel are generally two and a half times the rate for a sole arbitrator. Total procedural costs also include administrative fees, expenses, VAT and party costs.

What happens if a party does not pay its share of the advance?

Subject to Article 42, the other party may pay the outstanding share. The tribunal may order reimbursement and non-payment may lead to suspension or termination of the affected claims.

Next step

Contract, arbitration clause, correspondence and deadlines should be collected. It can then be assessed whether negotiation, preservation or arbitration is central.