Commercial disputes are rarely one-directional. The contractor claiming unpaid bills faces the employer’s claims for defects and delay; the distributor suing for credit notes meets the supplier’s claim for unpaid invoices. Section 23(2A) of the Arbitration and Conciliation Act, 1996 — inserted by the 2015 amendment to codify what good practice already was — provides that the respondent may submit a counterclaim or plead a set-off, which the tribunal shall adjudicate if it falls within the scope of the arbitration agreement. The provision sounds procedural; its correct use is frequently the difference between one efficient reference and a decade of parallel litigation.
Counterclaim versus set-off: the working distinction
A set-off is a shield: the respondent says that even if the claimant proves its claim, amounts the claimant owes the respondent reduce or extinguish it. A counterclaim is a sword: an independent claim seeking an award in the respondent’s favour, capable of exceeding the claim and surviving even if the claim fails entirely. The distinction carries consequences — a set-off falls with the claim’s dismissal only in its defensive role, while a counterclaim is adjudicated regardless; limitation doctrine treats transaction-linked defensive set-off more gently; and fee computation treats a counterclaim as a claim. Pleadings should say expressly which is intended, and in the alternative where both are.
The scope question: one agreement, one reference
Section 23(2A)’s single condition is that the counterclaim fall within the scope of the arbitration agreement. Most battles happen here. Claims under a different but related contract — the purchase order versus the master agreement, the works contract versus the settlement MOU — raise the question whether the clauses are compatible and the disputes referable together. Claims against or by non-signatories raise party-scope issues. And broad clauses (“all disputes arising out of or in connection with”) comfortably embrace counterclaims arising from the same relationship, while narrow clauses can exclude them. The tribunal decides its own jurisdiction under Section 16, and a respondent whose counterclaim is excluded retains its remedies elsewhere — but at the price of parallel proceedings, which is precisely what the provision exists to avoid.
Timing and the six-month discipline
1. Raise claims in correspondence early
Assert the respondent\'s claims in the pre-reference exchanges — including, where advisable, the respondent\'s own notice invoking arbitration for them. Early assertion fixes favourable dates and defeats the "afterthought" characterisation.
2. Plead with the statement of defence
Section 23(4) requires completion of the statements of claim and defence within six months of the arbitrators\' appointment; the counterclaim belongs in the defence, fully particularised with its own relief and interest claims.
3. Amendments sparingly
Section 23(3) permits amendment unless the tribunal considers it inappropriate having regard to delay — late counterclaims by amendment are the classic casualty.
4. Interim measures cut both ways
A respondent with a counterclaim may itself seek Section 17 interim protection — security, preservation of assets — and should evaluate it, not merely resist the claimant\'s.
Strategic considerations for both sides
- For respondents: a genuine counterclaim converts defence into leverage and consolidates the dispute; an inflated one costs fees, credibility and, ultimately, costs awards under the costs-follow-the-event regime.
- For claimants: anticipate the counterclaim in the reference\'s design — the arbitrator profile, the timetable, and security applications should account for the dispute\'s full two-way size.
- For drafters: a clause covering "all disputes arising out of or in connection with this agreement", harmonised across related contracts, prevents the scope battles that fragment references.
- For everyone: compute limitation per claim, on the date the claim enters the reference — assumptions borrowed from civil suit practice mislead in arbitration.
Awards and challenges
The award disposes of claim and counterclaim together, with set-offs applied and interest computed on the net or gross positions as the tribunal directs — a matter worth express argument, since interest asymmetries can dwarf the principal differences. In challenge proceedings, an award ignoring a properly pleaded counterclaim, or adjudicating one outside the agreement’s scope, furnishes distinct Section 34 grounds; the first as a decision failing to deal with the dispute submitted, the second as one beyond the submission. Both are avoidable by discipline at the pleading stage — which returns to the theme: the counterclaim is a full citizen of the reference, and it deserves the same rigour as the claim from the first day.
Practice note: In running-account relationships, reconcile the account before pleading. A respondent who pleads a counterclaim for sums the reconciliation later shows were credited hands the claimant a credibility weapon for the whole case. The accounting exercise is tedious and worth every hour.
Frequently Asked Questions
Does a counterclaim need its own Section 21 notice?
The counterclaim is made in the pending reference, and the considered position treats the counterclaim as commenced, for limitation purposes, when it is asserted in the arbitration — with the respondent's own prior notice invoking arbitration for those claims, where one was given, supplying an earlier date. The prudent respondent raises its claims in correspondence early and pleads them in the statement of defence, rather than holding them back.
Is a counterclaim subject to limitation?
Yes. The Limitation Act applies to arbitrations, and each counterclaim must be within limitation as on the date it is instituted in the reference. Set-off pleaded defensively in respect of the same transaction has more forgiving treatment in the classic doctrine, but no respondent should plan on the distinction — compute limitation claim by claim.
Can the tribunal refuse to hear a counterclaim?
Only on jurisdictional grounds: if it falls outside the arbitration agreement's scope, is between parties not bound by the agreement, or arises under a different contract with its own dispute resolution mechanism. Within scope, Section 23(2A) is mandatory in tenor — the tribunal adjudicates it. Belated counterclaims also meet Section 23(4)'s discipline: statements of claim and defence are to be completed within six months of the tribunal's constitution.
How are fees affected?
Where fees follow the schedule based on the "sum in dispute", claim and counterclaim are ordinarily reckoned — the Act contemplates the tribunal's fees computed on both, and institutional rules make their own provision. A large counterclaim is a real costs decision, not a free pleading, which is one reason inflated counterclaims raised purely for negotiation are a poor strategy.