Supreme Court Upholds Arbitral Tribunal Interest Bar in Major Commercial Dispute

In a significant reinforcement of party autonomy within the Indian arbitration framework, the Supreme Court of India ruled on March 9, 2026, that an arbitral tribunal cannot award interest if the underlying contract expressly prohibits it. The judgment, delivered in the matter of Union of India v. Larsen & Toubro, clarifies the boundaries of an arbitrator's power regarding financial awards. Justices Aniruddha Bose and Tanvi Narula Karol presided over the matter, setting aside an earlier order by the Allahabad High Court that had allowed such interest despite a clear restrictive clause.

The core of the dispute centered on whether the statutory powers of an arbitrator could override the specific negative covenants agreed upon by commercial entities at the time of signing a contract. By ruling in favor of the Union of India, the apex court has solidified the principle that the arbitral tribunal interest bar is a mandatory boundary that cannot be bypassed during the adjudication of claims.

Contextualizing the Arbitral Tribunal Interest Bar Under the 1996 Act

To understand the impact of this ruling, it is essential to look at the Section 31(7) of the Arbitration and Conciliation Act, 1996. This section generally empowers an arbitral tribunal to award interest for the period between the date on which the cause of action arose and the date on which the award is made. however, this power is not absolute. The statute specifically begins with the phrase "unless otherwise agreed by the parties," which serves as the legislative foundation for an arbitral tribunal interest bar.

In the case of Union of India v. Larsen & Toubro, the contract contained a specific provision stating that no interest would be payable to the contractor for any money or balance which might be in deposit or may become due. This type of clause is common in government contracts and infrastructure projects. The Supreme Court noted that when such a prohibition exists, the arbitrator loses the jurisdiction to grant pendente lite interest, which refers to interest during the period when the legal proceedings are actually ongoing.

Reversing the Allahabad High Court Mandate

The journey to the Supreme Court began after the Allahabad High Court had previously upheld an arbitral award that included interest, despite the existence of a clear arbitral tribunal interest bar. The High Court's rationale had leaned toward the equity of compensating a party for the time value of money during a prolonged dispute.

However, the Supreme Court bench disagreed with this interpretation. The justices emphasized that the arbitrator is a creature of the contract. If the contract creators decided to implement an arbitral tribunal interest bar, the arbitrator must remain within those four corners. The Court stated that the High Court had erred in not giving full effect to the restrictive clause, which was a vital part of the commercial bargain between the Union of India and the respondent.

Differentiation Between Pre-Award and Post-Award Interest

While the ruling strictly enforced the arbitral tribunal interest bar for the pre-award and pendente lite periods, the Court took a different approach regarding post-award interest. Post-award interest is the amount that accrues from the date of the award until the actual payment is made.

The Court observed that while the parties can agree to waive interest during the pendency of the proceedings, the logic of a contractual arbitral tribunal interest bar might not always extend to the period after a debt has been officially quantified by an award. In this specific case, while upholding the bar for the pre-award phase, the Supreme Court exercised its discretion to modify the post-award interest rate. The bench reduced the post-award interest to 8 percent, ensuring that while the contract is respected, the finality of the award is backed by a reasonable incentive for timely payment.

The Primacy of Party Autonomy in Commercial Contracts

The March 9 decision serves as a reminder of the "party autonomy" doctrine that governs modern arbitration. The Court highlighted that commercial parties are expected to understand the risks and terms they negotiate. When a contractor agrees to a project knowing there is an arbitral tribunal interest bar, they cannot later seek to circumvent that agreement by appealing to the tribunal’s general sense of fairness.

The judgment clarifies that an arbitral tribunal interest bar is not against public policy. Instead, it is a valid allocation of risk. By preventing the "rubber-stamping" of interest awards in the face of such bars, the Supreme Court has provided greater certainty to entities, particularly government departments, that utilize these clauses to manage potential liabilities in long-term infrastructure and engineering projects.

Strict Adherence to Contractual Prohibitions

The Supreme Court’s stance in Union of India v. Larsen & Toubro reinforces the idea that the words of a contract are paramount. The bench stressed that courts should not rewrite contracts or provide reliefs that the parties specifically chose to exclude. If the agreement stipulates an arbitral tribunal interest bar, that bar remains active and enforceable throughout the arbitration process.

This decision aligns with previous precedents but provides a modern clarity for the 2026 legal landscape. It ensures that the arbitration process remains a predictable mechanism for dispute resolution where the rules of engagement are set by the parties themselves, not by the subsequent preferences of an arbitrator. The ruling effectively shuts the door on claims for interest where the parties have explicitly said "no" in their initial agreement.