Background
Tehama Group Inc. sold a business to Pythian Services Inc. and Pythian Services USA Inc. under an agreement that included a potential post-closing payment of $10 million USD, contingent on the acquired business achieving an adjusted EBITDA target in the year following closing. When a dispute arose over the calculation, the parties appointed a chartered accountant as arbitrator under an agreed arbitration process. The arbitrator determined that the earnings target was not met and that Pythian was not obligated to make the additional payment.
Tehama applied to the Ontario Superior Court of Justice to set aside the award under Article 34 of the UNCITRAL Model Law on International Commercial Arbitration, as incorporated into Ontario law by the International Commercial Arbitration Act, 2017. Tehama alleged that the arbitrator’s process violated the parties’ arbitration agreement and breached the principles of natural justice — specifically that Tehama was denied the right to make submissions, that the arbitrator failed to address two procedural objections in the final award, and that the award rested on a new theory not advanced by Pythian. Justice Steele of the Superior Court dismissed the application and, in any event, indicated she would have exercised her discretion against setting aside the award even had a breach been found (2025 ONSC 4134).
Tehama appealed to the Court of Appeal for Ontario, arguing that the application judge erred in law by applying a lower standard of procedural fairness to the arbitrator on account of his being a chartered accountant rather than a legally trained decision-maker.
The Court’s Holding
The Court of Appeal dismissed the appeal. Writing orally for a unanimous three-judge panel (George, Copeland, and Gomery JJ.A.), the court held that the application judge committed no reviewable error. The court found that the application judge had correctly identified and applied the governing principles of natural justice and then made a series of factual findings — grounded in the parties’ arbitration agreement and the application record — that the arbitrator had complied with the agreed process throughout.
The court rejected Tehama’s contention that the application judge had imposed a reduced standard of procedural fairness because of the arbitrator’s accounting background. The application judge’s observation that the parties’ choice of process was likely informed by the nature of the dispute and the arbitrator’s expertise did not amount to a holding that an accountant-arbitrator is held to a lesser standard. Her analysis repeatedly returned to whether the arbitrator followed what the parties themselves had agreed to, not to any diminished expectation arising from his professional background.
The court further noted that Tehama was, in substance, seeking to re-litigate factual findings that were open to the application judge on the record — an impermissible use of the appellate process. Costs of $40,000 (all-inclusive, partial indemnity) were awarded to the respondents.
Key Takeaways
- An applicant seeking to set aside an international commercial arbitration award under Article 34 of the UNCITRAL Model Law bears a high burden; courts will not disturb an award merely because a party disagrees with the arbitrator’s conclusions.
- Where parties have themselves designed and agreed to an arbitration process, compliance with that agreed process is the central measure of procedural fairness — the arbitrator’s professional background (e.g., accountant vs. lawyer) does not lower the applicable standard.
- Appellate courts will not intervene to re-litigate factual findings made by an application judge that were reasonably supported by the record.
- Even where a breach of natural justice is found, courts retain discretion under the Model Law framework to decline to set aside an award, underscoring the strong policy favouring finality in arbitration.
Why It Matters
This decision reinforces Ontario’s strong pro-arbitration stance and the narrow grounds on which international commercial arbitration awards may be set aside. It confirms that parties who opt for a specialist (non-lawyer) arbitrator to resolve technical disputes — such as post-closing financial adjustments common in M&A transactions — cannot later argue that the arbitrator’s non-legal background justifies a more searching judicial review of the process.
For transactional lawyers and M&A practitioners, the case is a reminder that the arbitration agreement itself defines the procedural framework, and that courts will hold parties to the process they bargained for. Buyers and sellers structuring earnout provisions with accountant-arbitrators should ensure the agreed procedure is clearly documented, as procedural complaints raised after an unfavourable award face a steep uphill battle on judicial review.