ONESOURCE Calendar Classic retirement announcement April 2, 2025

Retirement of ONESOURCE Calendar
Classic
as a standalone product

Thomson Reuters will retire ONESOURCE Calendar Classic as a standalone product on March 31, 2026. Now is the time for you to upgrade to the new ONESOURCE Calendar, which offers many improvements.
Our new version takes a significant leap forward in terms of functionality, customization, and user experience. We believe it will drive efficiency, enhance compliance management, and propel your organization forward.
The Next Generation ONESOURCE Calendar offers a range of exciting features, including:
  • A sleek, modern UI that enhances user experience and ease of navigation
  • Custom lists and statuses that let you use dynamic dropdown lists and custom field values
  • Personalized display options to bring attention to the most important information for your organization
  • Effortless scheduling with an intuitive set-up wizard or streamlined bulk uploads
  • Easy integration with ONESOURCE data, including entities, jurisdictions, and tax types
  • Simple attachachments of supporting documents to each due date like workpapers and returns are maintained
  • Interactive dashboards that provide a comprehensive view of your due date statuses
  • An API integration to access, create, or update due dates and build custom dashboards
To learn more about the benefits of the new ONESOURCE Calendar and to discuss moving to the new solution, contact your Account team.
For a sneak peek at the new features and functionality of the new ONESOURCE Calendar, you can also watch a short video showcasing its capabilities.

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