Below are the Release Notes for TaxCalc 2026 releases. Click to see the Release Notes for 2013-2019 > 2020-2024 > 2025
Please note we phase releases out so you may not see this available straight away.
Please note:
For Customers who have not already updated to Version 17, this update requires an installer to be run. Please ensure that you have local admin rights before attempting the update.
This release may result in a change to the IR Mark on any existing V3 CT600 returns.
Please check our System Requirements before installing this version of TaxCalc.
Product summary
Technical
Upgrading the QT Framework that TaxCalc uses from QT5 to QT6.
This framework upgrade will enable TaxCalc to take advantage of newer technologies to maintain security and enhance functionality into the future.
NOTE: For Windows users only this will change the TaxCalc application from 32-bit to 64-bit. You will be automatically prompted to uninstall the existing 32-bit version during the setup of the new 64-bit version. This is expected.
Please note:
For Customers who have not already updated to Version 16, this update requires an installer to be run. Please ensure that you have local admin rights before attempting the update.
This release may result in a change to the IR Mark on any existing V3 CT600 returns.
Please check our System Requirements before installing this version of TaxCalc.
Product summary
Companies House Filing History
TaxCalc 2025 for Individuals & Self-Employed
Polling for submissions via the Companies House Filing Log, where submissions contained at least one Confirmation Statement with director verification pages, will no longer result in the application crashing.
Checking status via the Companies House Filing Log now works as expected in all scenarios and no longer displays the 'Companies House Filing History already open' dialog. A user that had this screen locked must log in once after update to clear the lock.
Resizing the product interface main screen is now possible so that all options are accessible when a size other than the default screen resolution is used.