Section 21 of the Arbitration and Conciliation Act, 1996 is one sentence with outsized consequences: unless otherwise agreed by the parties, the arbitral proceedings in respect of a particular dispute commence on the date on which a request for that dispute to be referred to arbitration is received by the respondent. That date stops the limitation clock, defines which disputes are within the reference, and is the foundation on which appointment applications and awards later rest. This explainer treats the invocation notice as the serious instrument it is — covering its functions, contents, service and the errors that undermine arbitrations at the enforcement stage.
The three functions of the invocation notice
What a sound notice contains
- The agreement: identification of the contract and the arbitration clause, quoted or annexed, including seat, institutional rules and tribunal composition as agreed;
- The disputes: a structured statement of each claim — the transaction, the breach, the amount or relief, and the period to which it relates — broad enough to cover the case, specific enough to define it;
- The demand: an unambiguous request that the disputes be referred to arbitration — the operative words on which commencement law turns;
- The appointment step: nomination or proposal of arbitrator(s) per the clause, with a call upon the respondent to act within thirty days of receipt;
- Reservations: interest claims, the right to supplement particulars, and interim-measure rights under Section 9 preserved expressly.
Service: where invocations fail
Commencement occurs on receipt, so proof of receipt is the notice's evidentiary spine. Section 3 of the Act supplies the default rule on when a written communication is deemed received — delivery to the addressee personally or at the place of business, habitual residence or mailing address, and, where none can be found after reasonable inquiry, dispatch to the last-known address by registered letter or equivalent means providing a record of the attempt. Practice should exceed the minimum: service by speed post with tracking, by email to the addresses used in the contract's dealings, and by courier, with every receipt preserved. Where the respondent is a company, service at the registered office anchors the record; where the clause designates notice addresses, they must be used. Enforcement-stage battles over commencement are almost always battles over service records assembled — or not assembled — years earlier.
The timeline the notice sets running
Practice note: Draft the invocation as the first pleading, not the last letter. It will be annexure A to the Section 11 application, exhibit one before the tribunal, and the document against which limitation and jurisdiction are tested at the Section 34 and enforcement stages. Rushed invocations that describe the disputes in a single sweeping sentence purchase speed at the cost of years of argument about what was actually referred.
Common errors and their costs
Recurring failures include: notices demanding payment with arbitration mentioned only as a threat — which may not amount to a request to refer, leaving commencement unachieved; notices served on a subsidiary, sister concern or individual officer rather than the contracting party; nominations made in breach of the agreed mechanism, seeding a Section 12 or Section 16 challenge to the tribunal's very constitution; invocations that omit whole heads of claim, forcing later arguments about supplementary references; and, most expensively, invocations dispatched days before limitation expires to addresses at which receipt cannot be proved. Each error is curable on the day of drafting and nearly incurable afterwards.
The takeaway
The Section 21 notice repays the care given to it many times over: it fixes the limitation date, frames the reference, and disciplines the appointment process. The working standard is simple — a notice that a stranger could read and know exactly what contract, what disputes, what demand and what next step — served so that receipt is beyond argument. Arbitration rewards parties who begin precisely; the invocation is where precision begins.
Frequently Asked Questions
Why does the commencement date matter so much?
Because Section 43 applies the Limitation Act, 1963 to arbitrations as it applies to court proceedings, and for that purpose an arbitration is deemed to have commenced on the Section 21 date. A claim alive on the date the respondent receives the invocation is saved; a notice sent after the period expires cannot revive it. The date also fixes which disputes are "referred", shaping the tribunal's jurisdiction.
Is a Section 21 notice mandatory before applying for appointment under Section 11?
The scheme presupposes it: the Section 11 application lies when the agreed appointment procedure fails after a party has requested arbitration — and without an invocation received by the respondent, there is ordinarily no commencement, no failure of the appointment mechanism, and nothing for the court to act upon. Sound practice treats a proper invocation notice as the indispensable first step.
Must the notice name an arbitrator?
It depends on the clause. Where the agreement gives each party a role in appointment, the notice should propose or nominate as the clause requires and call upon the respondent to act within thirty days. Where an institution administers the appointment, invocation follows the institutional rules. The notice should track the agreed mechanism faithfully — deviation invites jurisdictional objections.
Can fresh claims be added after the notice?
Claims not embraced by the invocation stand on a different footing for limitation: each dispute commences when its reference is requested. Tribunals do permit amendment of pleadings, but a claim first raised years later cannot borrow the original commencement date. Where new disputes crystallise, a supplementary invocation is the prudent course.