TaxCalc Release Notes 2026

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.

TaxCalc Product Update - version 17.1.130 - Released on 13 February 2026

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

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.

TaxCalc Product Update - version 16.8.310 - Released on 08 January 2026

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

Companies House Filing History

• 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.

TaxCalc 2025 for Individuals & Self-Employed

• 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.