INTRODUCTION
Ontario’s Rules of Civil Procedure are facing their most significant overhaul in decades. Following the Civil Rules Review (CRR) Final Policy Report released on December 15, 2025, the legal community is bracing for a mid-2026 rollout that will fundamentally reshape how civil litigation is conducted.
This is not just a procedural tweak; it is a shift from a largely party-driven system to a more court-managed model, one that will directly impact how lawyers engage with accounting experts. Earlier involvement, greater collaboration, and increased accountability will become central to how financial evidence is developed, tested, and presented throughout the lifecycle of a case.
New Rules around Expert Testimonial: What Counsel Needs to Know
The proposed reforms introduce several important structural changes to how accounting expert evidence will be handled in Ontario civil litigation.
One of the most notable developments is the move toward presumptive joint experts for standardized financial issues such as loss quantification, damages assessment, and financial reconstruction. Rather than each party retaining separate experts, courts may expect a single jointly retained expert. This represents a fundamental shift away from the traditional “battle of the experts” model. Lawyers will need to protect their client’s interests within a joint mandate while maintaining the expert’s independence and credibility.
Another key change is the introduction of expert conferencing, commonly referred to as “hot-tubbing.” In Trial Track cases, where many significant damages claims will fall, experts may be required to meet without counsel to discuss their findings and produce a joint statement. This makes pre-conference preparation critical. The positions agreed upon (or disputed) during these sessions can significantly shape the scope of issues that proceed to trial.
The reforms also propose a central misconduct registry, which will track judicial findings related to expert bias, lack of independence, or professional misconduct. As a result, vetting an accountant’s impartiality history will now become a mandatory due diligence step. The credibility of your expert may be scrutinized before their opinion is even considered on its merits.
In addition, standardized report formats and earlier deadlines will require experts to deliver high-quality, trial-ready work at much earlier stages of the case. The opportunity to refine or supplement opinions over time may be limited. This places greater emphasis on clarity, methodology, and defensibility from the outset.
Finally, trial sequencing is expected to change, with expert evidence presented after all fact evidence has been heard. This will require experts to be briefed with a more complete factual record, and for counsel to coordinate expert involvement with a clearer understanding.
Accounting Experts Are Now a Day-One Strategy
Retain Early or Lose Ground
Experts will need to be retained much earlier, often at or before the pleadings stage. Waiting until discovery to involve an accounting expert may no longer be practical, particularly where early financial analysis is required to support, refine, or even validate the claim. Early expert involvement can shape the direction of the file and avoid costly course corrections later.
Hard Timelines Become a Defining Feature
With cases expected to reach a hearing within approximately two years, timelines will become significantly more rigid. Expert deadlines will be set early, often at the scheduling conference, with limited expectation of adjournments. This increases the need for early coordination between counsel and experts to ensure all reporting obligations are met without delay.
Introduction of Joint Retainer Protocols
Joint expert appointments require a more deliberate approach to structuring mandates. Lawyers must balance the need to maintain expert independence with the need to ensure the expert’s analysis aligns with the case theory while protecting the client. Clear communication, well-defined scopes of work, and careful documentation will become essential in managing these relationships.
Pre-Litigation Protocols May Become Essential
For commercial disputes and debt collection, the new rules encourage (and in some cases require) a preliminary financial analysis before a claim is even issued. Early expert input can help assess viability, quantify losses, and inform litigation strategy before proceedings are even commenced. This represents a shift toward more front-loaded case preparation.
Preparing for the “Hot Tub”
Since counsel is excluded from expert conferencing, your “prep” phase becomes the most critical part of the file. Lawyers must ensure their experts are fully equipped to articulate, defend, and explain their conclusions independently. The joint statement that emerges from these sessions may significantly narrow or effectively determine the issues at trial.
No Firm Date, Which Is Exactly Why You Should Prepare Now
While the partial rollout is expected to begin in the fall of this year, waiting for a “hard date” is not a practical strategy in the current landscape. The transition period will be messy, and files started today will likely be governed by these new rules by the time they reach trial.
Law firms should begin preparing now.
Immediate Action Items:
- Audit Active Files: Identify and review matters that may be mid-stream when the new rules take effect.
- Update Retainers: Ensure your templates account for joint expert obligations and early disclosure requirements.
- Vet Your Roster: Review your go-to accounting firms now for any history of impartiality issues before the public registry goes live.
- Client Education: Brief clients at intake on the necessity of earlier financial disclosure and the potential for increased upfront costs.
As these changes reshape how financial evidence is developed and assessed, working with experienced accounting experts becomes increasingly important.
Great Oak VFA supports litigation teams by providing clear, defensible financial analysis that aligns with evolving procedural expectations, helping counsel prepare stronger, more reliable expert evidence from the outset.
And ultimately, the lawyers who treat accounting experts as a day-one asset, rather than an afterthought, will be best equipped to navigate Ontario’s evolving litigation landscape.
To learn more about how Great Oak VFA can support your files, connect with me by emailing jjohnson@greatoakvfa.ca