TL;DR

EY has begun rolling out agentic AI across its entire global assurance division, covering more than 130,000 auditors worldwide. Auditors will work alongside agents that manage complex tasks and processes, in what chief executive Janet Truncale described as a “human-led, AI-powered audit of the future”. The move extends a multi-billion-dollar EY programme to modernise assurance technology and get staff fluent with enterprise AI tools.

Why this is the biggest audit-AI move yet

Big Four firms have been piloting generative AI in audit for two years, usually in carefully ring-fenced teams. EY’s announcement is the first time one of them has committed a full assurance workforce to agentic AI — tools that plan and execute multi-step tasks rather than answer one-shot questions. That is a materially harder governance challenge: agents operating inside audit workpapers touch regulated methodology, working papers protected under professional standards, and audit evidence that must be traceable to human judgement under ISA UK and PCAOB rules.

For UK readers, the direct relevance is that EY’s UK arm employs roughly 21,000 people, including one of the largest assurance practices in the country. The rollout will flow through FTSE audits, public-sector work and NHS trust audits where EY holds mandates. FRC supervisors have already signalled closer scrutiny of AI use in audit methodology, and EY’s pace will test how quickly regulators can issue practical guidance rather than principles.

The counter-narrative

EY’s framing is deliberately defensive. The phrase “human-led, AI-powered” is the Big Four’s coordinated answer to the “AI will replace accountants” narrative that has unsettled graduate recruitment and clients. The practical reality is less binary: agentic AI will erode junior-auditor hours for data gathering, reconciliation and sampling, while raising the bar on what senior auditors must personally review and sign. That is a redesign of the pyramid, not its abolition.

Looking forward

Expect Deloitte, PwC and KPMG to respond within a quarter. The open question is whether “agentic” becomes a regulated term in audit — one that the FRC, PCAOB or IAASB will eventually have to define before agents become audit evidence in their own right.