What this guide covers
- Scope — opt-in, with no monetary threshold
- Switching the expedited rules off
- The notice of arbitration and statement of claim
- The response and statement of defence
- The appointing authority and the PCA
- One arbitrator, appointed in 15 days
- Consultation within 15 days of constitution
- The tribunal's control of time
- Counterclaims, set-off and the bar on amendment
- Evidence, document production and witnesses
- Hearings — and doing without them
- Interim measures
- The award: six months, capped at nine
- What happens when nine months is not enough
- What ad hoc costs you, and what it saves
- Frequently asked questions
The UNCITRAL Expedited Arbitration Rules, adopted in 2021, are the outlier in this series. There is no institution, no fee scale, no scrutiny of the award, and no monetary threshold. They apply only because the parties chose them — and once chosen they run on a rhythm of 15-day steps to an award due in six months. This is that sequence, with the article numbers.
Scope — opt-in, with no monetary threshold
The Expedited Rules sit as an appendix to the UNCITRAL Arbitration Rules and apply where the parties have agreed to arbitrate under them. The dispute is then settled under the UNCITRAL Arbitration Rules as modified by the Expedited Rules, subject to any further modification the parties agree (Article 1).
This is the structural difference from every institutional regime covered in this series. DIAC applies its expedited procedure automatically below AED 1,000,000, arbitrateAD below AED 9,000,000, SIAC's Streamlined track below S$1,000,000, and the ICC below USD 4,000,000. The Expedited Rules have no threshold whatsoever. They are available for a dispute of any value, and they apply to none unless the clause says so.
Certain provisions of the UNCITRAL Arbitration Rules are switched off: article 3(4)(a) and (b), article 6(2), article 7, article 8(1), the first sentence of article 20(1), the first sentence of article 21(1), article 21(3), article 22, and the second sentence of article 27(2).
Switching the expedited rules off
Two exits exist, and they are not symmetrical.
By agreement: at any time during the proceedings the parties may agree that the Expedited Rules shall no longer apply (Article 2(1)).
By the tribunal: on a party’s request, the tribunal may determine the same — but only in exceptional circumstances, after inviting the parties to express their views, and it must state its reasons (Article 2(2)).
In either case the arbitration does not restart. The tribunal remains in place and continues under the UNCITRAL Arbitration Rules (Article 2(3)). That matters: a party cannot use the exit to displace a tribunal it has come to dislike.
The notice of arbitration and statement of claim
The notice of arbitration carries two additions beyond what the ordinary UNCITRAL Rules require: a proposal for the designation of an appointing authority, unless one has already been agreed, and a proposal for the appointment of an arbitrator (Article 4(1)).
The provision that changes how a claimant prepares is Article 4(2): when it communicates the notice of arbitration, the claimant shall also communicate its statement of claim. There is no gap between commencing and pleading. A claimant electing these rules must have the case fully worked up — evidence assembled, quantum modelled — before it presses the button. In practice that means the real preparation time is front-loaded rather than saved.
Both documents go to the tribunal as soon as it is constituted (Article 4(3)).
The response and statement of defence
The respondent has 15 days from receipt of the notice of arbitration to communicate its response, which must also answer the proposals on the appointing authority and the arbitrator (Article 5(1)).
The statement of defence follows within 15 days of the constitution of the tribunal (Article 5(2)) — not 15 days from the response, and not on a timetable the tribunal sets. A respondent therefore knows its pleading deadline from the moment the arbitrator is in place.
The appointing authority and the PCA
If the parties have not agreed on an appointing authority within 15 days of a proposal reaching all other parties, any party may ask the Secretary-General of the Permanent Court of Arbitration to designate one, or to serve as appointing authority (Article 6(1)).
The PCA Secretary-General will serve unless it considers that, in the circumstances, designating someone else is more appropriate (Article 6(3)). This is the mechanism that keeps an ad hoc expedited arbitration from deadlocking at the first step, and it is worth naming the PCA in the clause so the 15-day argument never happens.
One arbitrator, appointed in 15 days
Unless the parties agree otherwise, there shall be one arbitrator (Article 7). Three-member tribunals are not excluded, but they are not the default and they sit awkwardly with a six-month clock.
The sole arbitrator is appointed jointly by the parties (Article 8(1)). If they have not agreed within 15 days of a proposal reaching all other parties, the appointing authority appoints on a party’s request (Article 8(2)).
Consultation within 15 days of constitution
Promptly after constitution, and in any event within 15 days, the tribunal must consult the parties — by case management conference or otherwise — on how it will conduct the arbitration (Article 9).
This is the moment at which the shape of the case is settled, and given how much discretion the Expedited Rules hand the tribunal on evidence, hearings and further submissions, it is where a party should be making its procedural case rather than assuming a conventional timetable will follow.
The tribunal's control of time
Subject only to the award deadline in Article 16, the tribunal may at any time extend or abridge any period of time prescribed under the UNCITRAL Arbitration Rules or the Expedited Rules, or agreed by the parties, after inviting the parties to express their views (Article 10).
The tribunal may also use any technological means it considers appropriate, including to hold consultations and hearings remotely (Article 3(3)). Both parties and tribunal are under an express obligation to act expeditiously (Articles 3(1) and 3(2)).
Counterclaims, set-off and the bar on amendment
A counterclaim or a claim for set-off must be made no later than in the statement of defence, provided the tribunal has jurisdiction over it (Article 12(1)). Later is possible only where the tribunal considers it appropriate having regard to the delay, prejudice to others and the circumstances (Article 12(2)).
Article 13 is stricter than most practitioners expect. A party may not amend or supplement its claim or defence — including a counterclaim or set-off — unless the tribunal considers it appropriate. And no amendment may take the claim outside the tribunal’s jurisdiction. Under the ordinary UNCITRAL Rules amendment is permitted subject to the tribunal’s discretion to refuse; here the default is reversed. Pleading the case correctly first time is not merely good practice under these rules, it is close to the only opportunity.
Further written statements are at the tribunal’s discretion after hearing the parties (Article 14).
Evidence, document production and witnesses
The tribunal decides which documents, exhibits or other evidence the parties should produce. It may reject any request to establish a procedure whereby each party can request documents from another — unless that request is made by all parties (Article 15(1)).
That is, in practical terms, the removal of document production as of right. A party whose case depends on documents in the opponent’s possession should think hard before agreeing to these rules, or should agree a production protocol in the arbitration agreement itself.
Witness statements, including from expert witnesses, are presented in writing and signed unless the tribunal directs otherwise (Article 15(2)), and the tribunal decides which witnesses will testify if hearings are held (Article 15(3)).
Hearings — and doing without them
The tribunal may decide that hearings shall not be held, after inviting the parties to express their views and in the absence of a request to hold them (Article 11).
The conditional matters. A party that wants an oral hearing should request one, on the record, at the Article 9 consultation. Silence is what enables a documents-only determination.
Interim measures
The Expedited Rules do not modify article 26 of the UNCITRAL Arbitration Rules, so the tribunal’s power to grant interim measures operates in the ordinary way once it is constituted.
What does not exist is an emergency arbitrator. DIAC and arbitrateAD appoint one within a day, SIAC within 24 hours, and the ICC operates Appendix IV. There is no emergency arbitrator mechanism in ad hoc UNCITRAL arbitration at all. Before the tribunal exists, the only route to urgent relief is a national court. Where the risk of dissipation is real, that gap should drive the choice of rules, or at least the choice of seat.
The award: six months, capped at nine
The award shall be made within six months from the date of the constitution of the tribunal, unless the parties agree otherwise (Article 16(1)).
The tribunal may extend in exceptional circumstances after inviting views, but the extended period shall not exceed a total of nine months from constitution (Article 16(2)). That is a hard ceiling on the tribunal’s own power.
Note what the clock runs from. It is the constitution of the tribunal — as under SIAC’s Streamlined and Expedited tracks — and not transmission of a file (DIAC), the initial case management conference (arbitrateAD, ICC expedited), or a date the institution fixes.
What happens when nine months is not enough
Article 16 has an escalation that repays reading before it is needed.
If the tribunal concludes it is at risk of not rendering an award within nine months, it must propose a final extended time limit, state its reasons, and invite the parties to express their views within a fixed period. The extension is adopted only if all parties agree within that period (Article 16(3)).
If there is no agreement, any party may request that the Expedited Rules cease to apply, and the tribunal — after inviting views — may determine to continue under the ordinary UNCITRAL Arbitration Rules (Article 16(4)).
So the six-month deadline is real but not brittle. It does not void the award or unseat the tribunal; it converts the arbitration back to a conventional one. A respondent hoping to weaponise the deadline will find that refusing an extension buys a slower procedure, not a dead claim.
What ad hoc costs you, and what it saves
These rules remove the institution entirely, and it is worth being explicit about both sides of that.
What you save: there is no registration fee, no administrative fee and no institutional scale on the arbitrator’s fees. On a substantial matter the institutional layer at DIAC, arbitrateAD, SIAC or the ICC runs to a meaningful sum, and here it is simply absent. The procedure is also unusually lean by design — one arbitrator, no document production as of right, often no hearing.
What you give up: no scrutiny of the award, of any kind. The ICC Court must approve the form of every award and now considers its validity and enforceability; SIAC’s Registrar must approve form before issue; arbitrateAD’s Court must approve every award outright. Ad hoc, nobody checks. You also give up the emergency arbitrator, institutional appointment machinery beyond the appointing authority, and the administrative apparatus that chases deadlines and holds deposits.
The honest summary is that UNCITRAL expedited arbitration suits sophisticated parties with competent counsel, a documentary dispute, and a cooperative opponent. Against an opponent determined to obstruct, the absence of an institution is felt immediately — and the absence of scrutiny is felt at enforcement.
Frequently asked questions
Do the UNCITRAL Expedited Rules apply automatically to small claims?
No. Unlike DIAC, arbitrateAD, SIAC and the ICC, which apply expedited procedures automatically below a monetary threshold, the UNCITRAL Expedited Rules are purely opt-in and have no threshold at all (Article 1). They apply only where the parties have agreed to them. That makes the clause the only thing that matters — and makes them available for a dispute of any size.
How many arbitrators sit under the Expedited Rules?
One, unless the parties agree otherwise (Article 7). The sole arbitrator is appointed jointly, and if the parties have not agreed within 15 days of a proposal, the appointing authority appoints on a party's request (Article 8).
When must the statement of claim be served?
With the notice of arbitration (Article 4(2)) — not later, as under the standard UNCITRAL Rules. A claimant electing expedited arbitration must therefore have its case fully pleaded before it starts. The statement of defence follows within 15 days of the tribunal's constitution (Article 5(2)).
Is there document production in a UNCITRAL expedited arbitration?
Effectively not, unless everyone wants it. The tribunal decides which documents the parties should produce, and may reject any request to establish a document-production procedure unless the request is made by all parties (Article 15(1)). A party expecting the disclosure it would get in a conventional arbitration should not be electing these rules.
How long does the tribunal have to make the award?
Six months from the constitution of the tribunal (Article 16(1)). The tribunal may extend in exceptional circumstances, but the extended period shall not exceed nine months in total (Article 16(2)). Beyond nine months, an extension takes effect only if all parties agree to a proposed final limit (Article 16(3)).
What happens if the nine-month limit cannot be met and a party refuses to extend?
Any party may request that the Expedited Rules cease to apply, and the tribunal may determine to continue the arbitration under the ordinary UNCITRAL Arbitration Rules (Article 16(4)). The tribunal stays in place — the case does not restart. In effect the expedited regime has a built-in exit rather than a hard deadline that invalidates the award.
Can the parties get out of the expedited procedure earlier?
Yes, in two ways. The parties may agree at any time that the Expedited Rules no longer apply (Article 2(1)). Or, on a party's request, the tribunal may determine the same in exceptional circumstances, after inviting views and stating its reasons (Article 2(2)). Either way the tribunal remains in place and continues under the UNCITRAL Arbitration Rules (Article 2(3)).
Is there any scrutiny of the award?
None. These are ad hoc rules with no administering institution, so there is no equivalent of ICC Court scrutiny, SIAC Registrar approval or the arbitrateAD Court's mandatory approval. That removes cost and delay, and removes a safety net: nobody checks the award's form before it issues. Where enforceability in a difficult jurisdiction is the priority, an institutional rule set with scrutiny is usually the better choice.