Thomson Reuters Launches CoCounsel Audit, a Next-Gen AI Tool for Auditors

AI Powered CoCounsel Audit

Audit firms are under pressure to work faster and cut risks, but without losing quality. That is where artificial intelligence is starting to make a real difference. A new tool called CoCounsel Audit, developed in partnership with Thomson Reuters and PwC, is one of the latest signs that audit firms are not just experimenting with AI they are starting to use it as part of their core process

Key Takeaways

  • CoCounsel Audit by Thomson Reuters is changing how audit work gets done by combining AI precision with human oversight.
  • Early results show firms are saving hours and improving quality, with less stress on staff and quicker client turnaround.
  • The tool works inside existing audit workflows and keeps professionals in charge but training and clear policy updates are needed.
  • More AI driven features are already on the way, with broader adoption expected across tax, legal and compliance roles.

The system is designed to help audit professionals review large volumes of documents more quickly, identify inconsistencies and flag potential risks. But it does not take over the audit process. Instead, it works alongside human teams, allowing auditors to spend less time on routine checks and more time thinking through judgments, assumptions and questions that actually need their experience.

As noted by Thomson Reuters, the idea is not to automate auditors out of their jobs. The technology is aimed at helping auditors do better work with less stress, while also making it easier to scale up reviews as client demands grow. With business environments getting more complex every year, that kind of support is no longer optional, it is becoming necessary.

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It Solves a Big Problem That Slows Down Many Audit Teams

Ask anyone who has worked on an audit and they will tell you: reviewing long, repetitive documents takes a lot of time. Some of it is just making sure the right numbers are in the right places. But some of it is about noticing when something does not line up like a contract that says one thing, but a report that shows another.

Auditors often deal with tight deadlines and big volumes of documents, especially when the client has operations in more than one country. In those cases, even a small error can slip through and create a compliance problem later on.

CoCounsel Audit is built to take on that kind of pressure. It can scan through large sets of audit documentation, like leases, loan agreements, revenue records and policy terms and surface key issues for human review. Instead of replacing human judgment it gives auditors a way to cover more ground and still focus on what matters.

What is more? It helps reduce what many firms call “review fatigue.” When teams are overworked, the chances of overlooking something important go up. But when a tool helps identify those pain points earlier, it gives auditors the breathing space to catch issues without rushing.

How AI Helped Free Up Time and Improve Quality in Early Pilot Tests

Before CoCounsel Audit, a good portion of an auditor’s day went into combing through documents, tying up loose ends and filling in the blanks from clients’ records. What made it harder was the growing list of compliance expectations and ever changing audit frameworks. Now with the AI tool, many of these mechanical tasks are being offloaded without pushing people out of the loop.

In early pilot tests, firms reported a meaningful cut in review hours and a noticeable improvement in focus. Instead of getting buried in trial balances and sorting line items, staff auditors were able to focus more on higher value areas like fraud risk indicators and judgment based evaluations.

Some of the manual work that got shifted to the AI include:

Key Audit Tasks Now Handled with AI Assistance:

  • First-pass document reviews for receipts, contracts and financial records
  • Risk flagging and anomaly detection across large datasets
  • Drafting citations and documentation for working papers
  • Preliminary trial balance analysis tied to prior period adjustments
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TaskTraditional MethodWith CoCounsel Audit
Document Review Time6–8 hours per audit2–3 hours per audit
Anomaly DetectionManual checksAI-flagged with explanation
Trial Balance ValidationSpreadsheet cross-checksutomated with audit trail
Client Follow-UpsMultiple emails/roundsEarly alerts during prep

The software does not just surface numbers, it helps identify areas where gaps exist or further explanations may be required. One auditor shared in the internal feedback that it “cleared the noise” and brought more structure into how the initial workpapers were set up.

Some also noted that burnout risks were down, especially for junior team members. With fewer hours spent doing repetitive legwork, they were able to engage more with senior reviewers and learn faster.

“CoCounsel Audit has helped us cut hours off each engagement while improving how we document our reviews,” said a senior manager at Plante Moran, one of the early adopters. “The technology fits naturally into our workflow without disrupting how we serve clients.”

Fits Into Existing Audit Workflows Without Disrupting Systems or Oversight

One of the biggest challenges with new tech in auditing is that it often adds layers rather than reducing them. CoCounsel Audit seems to have avoided that problem. It was designed to fit directly into common audit software ecosystems, rather than force firms to rebuild their process from scratch.

According to Thomson Reuters the tool was made to work alongside platforms already in place at mid sized and larger audit firms. That means document management, version control, and audit trails remain intact. The AI only enters the process when asked to assist and even then the final judgment stays with the human professional.

Built-In Guardrails and Firm Level Control:

  • All activity is logged and traceable, supporting standard audit documentation
  • No client data is sent out without explicit firm level settings
  • Output is fully editable and marked as AI-assisted, keeping humans accountable
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The system also comes with end to end encryption and data controls that meet SOC 2 compliance levels. Several audit partners, including those at Plante Moran and Morgan Lewis, were brought into the early feedback loop and helped shape some of these security features.

What stands out is not just the technical security but how much emphasis was placed on giving firms control. Every firm has its own way of documenting, tagging, and validating client data and CoCounsel lets them keep it that way. It enhances, not replaces their way of doing things.

What Firms and Clients Can Expect as CoCounsel Enters the Mainstream

Firms that tested CoCounsel Audit early are already talking about how it is shifting the way they approach audits. Some say it is not just about saving hours, it is also about making better use of their people. When AI clears the noise, senior staff can focus on things that matter more, and junior staff can learn in a less stressful setting.

For clients, it means less back and forth. The system flags missing documents or inconsistencies early, reducing the need for long email trails near deadline. One controller at a mid sized firm said their recent audit took fewer calendar days and had fewer rounds of revision.

But the impact is not the same for every firm. Larger audit firms that already use digital workflows will likely find it easier to plug in this tool. Small firms especially those still on legacy systems, may need more time and training to get up to speed.

“What we noticed wasn’t just speed, it was better consistency in our communication,” said an audit director at Morgan Lewis. “That’s something both clients and teams appreciate.”

What Audit Firms Can Expect:

  • Fewer hours spent on first-pass reviews
  • Improved consistency in how findings are documented
  • Better use of internal review time

What Clients May Notice:

  • Earlier requests for key documents
  • Faster resolution of open items
  • More accurate final reports

The competitive edge here is in execution. Firms that adopt early may be able to deliver cleaner audits faster and at lower cost, something that matters when margins are tight. That said, leadership buy-in and proper training will decide whether this works in practice or becomes just another tool with limited use.

Getting Ready for What’s Next: Training, Adoption and Broader Expansion

Thomson Reuters is not treating CoCounsel Audit as a one off product. From early communication, it is clear this is the beginning of a broader move toward embedding AI across tax, legal and compliance areas. Audit just happens to be the starting point.

The company is already working on its next AI powered tool, tentatively called Ready to Review, which will focus on helping tax professionals automate parts of document prep and review before client delivery. That tool is expected to begin testing later this year.

What Audit Firms Should Do Now:

  • Assess existing workflows to identify where CoCounsel can help
  • Nominate internal AI champions who can lead training and troubleshooting
  • Review data security settings to ensure compliance with firm policy
  • Update audit planning templates to integrate AI assisted procedures
  • Educate clients early on how document requests or reviews may look different
  •  

Some firms are also revisiting how they credential their audit teams, especially around data privacy and AI oversight. Since output from CoCounsel must be reviewed and approved by licensed professionals, clear policies are needed to define where AI stops and human responsibility begins.

As more firms adopt tools like this, the pressure will likely increase for everyone to modernize. But done thoughtfully, this is not about replacing judgment or removing expertise. It is about taking the heavy lift out of basic work so professionals can do what they were trained to do- analyze, advise and protect the integrity of the audit process.

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