EY has completed a full production rollout of multi-agent AI across its entire Assurance division: 130,000 professionals, 160,000 audit engagements, more than 150 countries. The deployment, announced by EY as part of its “All in” global strategy, embeds agentic AI directly into EY Canvas, the firm’s unified audit platform that processes over 1.4 trillion lines of journal entry data per year.
This is not a pilot. EY describes it as a “multibillion-dollar commitment” to audit quality and technology, backed by what the firm says was “a sustained period of extensive and successful testing and piloting,” according to CPA Practice Advisor.
How It Works
The multi-agent framework is built on Microsoft Azure, Microsoft Foundry, and Microsoft Fabric, integrated into EY Canvas. Agents handle risk assessments, tailor workflows to specific engagements, reduce administrative burden on clients, and provide continuously updated auditing and accounting guidance. EY Global Chair and CEO Janet Truncale said in the announcement: “The rapid growth of data, and the new complexities of assuring AI, demand that our people and technology evolve faster than ever.”
EY targets full end-to-end AI-supported audits by 2028. The firm is also part of Microsoft’s inaugural Frontier Firm AI Initiative alongside 13 other organizations, a collaboration with The Harvard Digital Data Design Institute recognizing companies deploying advanced AI at scale. Microsoft’s commercial business CEO Judson Althoff called EY’s deployment proof of “what is possible when advanced technology is deployed at enterprise scale,” per the EY newsroom release.
The Scale Problem Solved
The numbers matter. 1.4 trillion journal entry lines annually. 160,000 engagements. 150+ countries. EY is running a global training program throughout 2026 to upskill auditors and has joined Stanford’s Human-Centered AI Industrial Affiliates Program, according to HR Grapevine. EY Global Vice Chair of Assurance Marie-Laure Delarue stated that the firm’s commitment to its own transformation “uniquely positions us to help organizations around the world implement AI at scale.”
The Competitive Signal
EY’s rollout sets the pace for the Big Four. A 130,000-person deployment with a multibillion-dollar investment behind it turns agentic AI from an innovation talking point into mandatory professional services infrastructure. The firm simultaneously launched AI assurance services for clients covering diagnostics, governance, risk management, and controls. For organizations still running AI pilots, the message from professional services is clear: production-scale deployment is already underway at the firms that audit the world’s largest companies.