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Software vendor

Thomson Reuters

Thomson Reuters, a Toronto-based public company, sells ONESOURCE tax software and CoCounsel Tax, an AI research and drafting assistant for in-house tax teams.

2 offerings in the directory Last verified

Function

Ownership
Public

Files annual reports on Form 40-F; Woodbridge and its affiliates beneficially owned about 70% of common shares as of March 2, 2026.

SourcesThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)SEC EDGAR submissions index for Avalara, Vertex, Zuora and Thomson Reuters
Headquarters
Canada
SourceThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)
SEC reporting
Yes
SourceSEC EDGAR submissions index for Avalara, Vertex, Zuora and Thomson Reuters
Audit firm
No
Website
tax.thomsonreuters.com
SourceThomson Reuters ONESOURCE
Subprocessor list
Not stated
Contract terms
Not stated

Offering · Software

CoCounsel Tax for corporate tax departments

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Thomson Reuters describes CoCounsel Tax as cited, audit-ready analysis for in-house tax teams, grounded in its Checkpoint content, in one workspace that brings Checkpoint, SharePoint and internal systems together. SourceCoCounsel Tax for corporations

It lists cited research answers, analysis of uploaded documents, guided templates for multistep tasks and memo drafting. SourceCoCounsel Tax for corporations

Its 2025 annual report describes CoCounsel for Tax & Audit, a product name the CoCounsel Tax page does not use, as a generative AI platform using large language models. SourceThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)

Thomson Reuters states that uploaded documents are never used to train its AI models. SourcesCoCounsel Tax for corporationsCoCounsel plans for in-house tax and accounting teams

Where it fits

CoE analysis A research and drafting assistant for corporate tax positions and technical memos, subscribed separately and used alongside tax systems rather than built into them, not a calculation or filing engine.

CoE analysis The page suggests output can go to auditors without additional checking, a claim to test against the team's own review standard before relying on it. SourceCoCounsel Tax for corporations

What it does

Offering type
Software
SourcesCoCounsel Tax for corporationsThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)
Workflow areas
Tax
SourceCoCounsel Tax for corporations
Customer size
Not stated

AI

Kind of AI
General-purpose assistant
SourcesCoCounsel Tax for corporationsCoCounsel plans for in-house tax and accounting teams
Suggests or acts
Suggests
SourceCoCounsel Tax for corporations
Availability
Not stated

Sold through plans for in-house teams; no availability labels.

Models named
Not stated

Control

Who controls it
Individual user

Individual users choose prompts, uploaded documents and templates (C-3991); uploads sit in a private workspace with role-based access controls (C-3996), which implies an administrator the sources do not describe.

SourcesCoCounsel plans for in-house tax and accounting teamsCoCounsel Tax for corporations

Commercial

Pricing model
Quote only
SourceCoCounsel plans for in-house tax and accounting teams
Public price
Not stated

Evidence

Independent outcomes
None found in the sources read.
Sources read
  • Vendor-stated 6
  • Independent market evidence 1
  • Independently verified outcomes None read
  • Pricing 1
  • Known limitations 1
Coverage
Directory record
Last verified

Security and control

Single sign-on
Not covered in this record
User provisioning
Not covered in this record
Role-based access
Not covered in this record
Administrator controls for AI
Not covered in this record
Audit logs
Not covered in this record
Certifications
Not covered in this record
Data retention
Not covered in this record
Data residency
Not covered in this record
Training on customer data
Not covered in this record

AI features

As the vendor or firm describes them. Notes in small print record what the sources leave open.

  1. Cited tax research

    Answers multijurisdictional questions with full citations to Checkpoint, IRS code and government web sources.

    Kind
    General-purpose assistant
    Suggests or acts
    Suggests
    Who controls it
    Not stated
    Availability
    Not stated

    Control: Not stated in the sources read.

    SourcesCoCounsel Tax for corporationsCoCounsel plans for in-house tax and accounting teams

  2. Document analysis

    Uploads and analyzes multiple documents simultaneously and surfaces relevant regulations and issues with citations.

    Kind
    General-purpose assistant
    Suggests or acts
    Suggests
    Who controls it
    Not stated
    Availability
    Not stated

    Control: Not stated in the sources read.

    SourceCoCounsel Tax for corporations

  3. Guided templates and drafting

    Completes multistep tasks with guided templates and drafts memos, technical positions and regulatory summaries from a single prompt.

    Kind
    General-purpose assistant
    Suggests or acts
    Suggests
    Who controls it
    Not stated
    Availability
    Not stated

    Control: Not stated in the sources read.

    SourceCoCounsel Tax for corporations

Questions to ask

For this offering

  • Which model providers process our prompts and uploaded documents, where, and for how long are prompts, outputs and uploads kept?
  • Is the commitment that our uploads are never used for training in our contract, and does it cover outputs and feedback?
  • Is CoCounsel output generative, so that the same question can return a different answer, and how do we keep a record of the answer and sources we relied on?
  • What review does Thomson Reuters expect before a memo goes to our auditors, given the page's statement about sharing without additional checking?
  • How is CoCounsel Tax priced for our team, and what is the billing unit?

From the diligence question set

  1. DQ-02 Which AI features depend on models, data or services from third parties, and how do you assess and monitor those providers?
  2. DQ-09 Is each output generative or deterministic, what does any confidence score mean, and can a past output be reproduced and explained?
  3. DQ-15 Can a reviewer see the sources behind each output, and can someone else re-perform or trace it?
  4. DQ-16 Is our data, including inputs, outputs, documents and corrections, used to train or improve any model, yours or a third party's? Is that off by default, and is the commitment in the contract?
  5. DQ-17 How long are prompts, outputs and logs kept, where are they stored and processed, and can we have them deleted?
  6. DQ-19 How are the AI features priced: included in the subscription, sold as an add-on or higher tier, or metered by use? What is the billing unit?

Build questions for this vendor

Offering · Software

Thomson Reuters ONESOURCE

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Thomson Reuters describes ONESOURCE as end-to-end cloud software for tax, trade and financial reporting, covering indirect tax and e-invoicing, provision, income tax compliance, statutory reporting and information reporting. SourceThomson Reuters ONESOURCE

It says ONESOURCE is used by companies from small businesses to multinationals, with over 100,000 users across 21,000 businesses. SourceThomson Reuters ONESOURCE

Its 2025 annual report says the corporate strategy is built around ONESOURCE+, combining proprietary content with AI-driven workflow software including CoCounsel AI and agentic technology. SourceThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)

Where it fits

CoE analysis Corporate tax department software spanning direct and indirect tax, provision and statutory reporting.

CoE analysis The AI documented in the sources read is research assistance inside ONESOURCE rather than automated determination or filing.

What it does

Offering type
Software
SourceThomson Reuters ONESOURCE
Workflow areas
  • Tax
  • Reporting and disclosure
SourceThomson Reuters ONESOURCE
Customer size
  • Small business
  • Mid-market
  • Enterprise
SourceThomson Reuters ONESOURCE

AI

Kind of AI
Built into the platform
SourcesThomson Reuters ONESOURCEThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)
Suggests or acts
Suggests
SourceThomson Reuters ONESOURCE
Availability
Not stated

No availability terms for AI features in ONESOURCE were found in the sources read.

Models named
Not stated

Control

Who controls it
Not stated

Not stated in the sources read.

Commercial

Pricing model
Not stated
Public price
Not stated

Evidence

Independent outcomes
None found in the sources read.
Sources read
  • Vendor-stated 5
  • Independent market evidence None read
  • Independently verified outcomes None read
  • Pricing None read
  • Known limitations None read
Coverage
Directory record
Last verified

Security and control

Single sign-on
Not covered in this record
User provisioning
Not covered in this record
Role-based access
Not covered in this record
Administrator controls for AI
Not covered in this record
Audit logs
Not covered in this record
Certifications
Not covered in this record
Data retention
Not covered in this record
Data residency
Not covered in this record
Training on customer data
Not covered in this record

AI features

As the vendor or firm describes them. Notes in small print record what the sources leave open.

  1. AI-assisted regulatory research

    A regulatory research tool powered by Checkpoint Edge with CoCounsel.

    Kind
    Built into the platform
    Suggests or acts
    Suggests
    Who controls it
    Not stated
    Availability
    Not stated

    Control: Not stated in the sources read.

    SourceThomson Reuters ONESOURCE

  2. ONESOURCE+ with CoCounsel AI and agentic technology

    Strategy described in the annual report: unifying tax, trade, legal and risk functions with AI-driven workflow software, including CoCounsel AI and agentic technology.

    Kind
    Built into the platform, Agents and automated actions
    Suggests or acts
    Not stated
    Who controls it
    Not stated
    Availability
    Not stated

    Control: Not stated in the sources read.

    SourceThomson Reuters Annual Report 2025 (Exhibit 99.1 to Form 40-F filed March 5, 2026)

Questions to ask

For this offering

  • Which AI features are in the ONESOURCE modules we license today, and which belong to ONESOURCE+ or separate CoCounsel subscriptions?
  • Which models and providers process our tax data in AI-assisted research and any agentic features, and is our data used to train them?
  • Do any ONESOURCE AI features calculate, determine or file, or are they limited to research and drafting?
  • Does the SOC report for ONESOURCE cover its AI features?

From the diligence question set

  1. DQ-02 Which AI features depend on models, data or services from third parties, and how do you assess and monitor those providers?
  2. DQ-04 Which AI features are in the modules and edition we license, or would license, and is each generally available, in preview or beta, a paid add-on, or limited by edition or region?
  3. DQ-10 What data does each feature read, from which modules, documents or outside sources, and what data can it not see?
  4. DQ-16 Is our data, including inputs, outputs, documents and corrections, used to train or improve any model, yours or a third party's? Is that off by default, and is the commitment in the contract?
  5. DQ-19 How are the AI features priced: included in the subscription, sold as an add-on or higher tier, or metered by use? What is the billing unit?

Build questions for this vendor