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System Requirements for TaxCalc

Article ID: 2066
Last updated: 08 Oct, 2021

TaxCalc is either ‘fully supported’, ‘partially supported’ or ‘unsupported’ running on the configurations of operating system as listed here. 

Fully supported

TaxCalc is optimised to work on the specified versions of these operating systems and all releases are tested on them. Please note those marked with a * have additional information below.

Microsoft Windows

  • 10
  • 8(*) / 8.1
  • 7 (Service Pack 1) (*)
  • 2008R2 (2008 before R2 is not supported)
  • SBS Server 2011
  • Server 2012
  • Server 2016

Please note the computer which holds the server type installation/database is required to be 64-bit.

Apple Mac (64-bit Intel processors only)

  • 11.00 Big Sur (**).
    • Please see KB-3120 for additional information relating to Big Sur.
  • 10.15 Catalina (**)
  • 10.14 Mojave
  • 10.13 High Sierra (*)
  • 10.12 Sierra (*)

Please note M1 chips issued for new Mac machines are supported for use with the TaxCalc application.


  • 64 bit kernel 3.10 (or higher), Debian (e.g. Ubuntu) or Redhat based distributions
  • Graphical user interface (GUI)
  • Office productivity software (for Word and Excel exports)

We fully support customers with TaxCalc queries encountered when running on these configurations and we endeavour to correct any issues that emerge.

Appropriate hardware is required to run any operating system.

Partially supported

* Please note that the operating systems below are no longer supported by Microsoft or Apple, or support is soon to end. Whilst they are currently supported by TaxCalc, this cannot be guaranteed and is on a best efforts basis. TaxCalc would strongly recommend upgrading your operating system if you are using one of the following:

  • Windows 7 - Microsoft support ends 14th Jan 2020
  • Windows 8 - Microsoft support ended Jan 2016 (Windows 8.1 is still fully supported)
  • Max OSX 10.12 Sierra - Apple support ended Oct 2019
  • Mac OSX 10.13 High Sierra - Apple support ended after Dec 2020

** Catalina/Big Sur users may experience a message saying that Apple cannot check the application. In this case please refer to our Knowledge Base article, Issues installing TaxCalc on Catalina/Big Sur.

Pending Changes

Apple Mac (64-bit Intel processors only)

  • 11.00 Big Sur
    • Please see KB-3120 for more information.
  • 12.00 Monterey
    • This is currently under investigation.

Windows 11

  • Windows 11
    • This is currently under investigation. Provisional tests have shown no problems.


For more information on our unsupported operating systems, please see our Knowledge Base article for Retired Operating Systems

These operating systems may no longer be supported by their suppliers making them vulnerable to security threats and we strongly recommend that all customers move to a fully supported platform immediately.

Program Compatibility

  • The Encrypted PDF module is not compatible with Mac or Linux operating systems.
  • Mac and Linux machines can act as clients connecting to the server and CloudConnect versions of TaxCalc, but cannot currently act as the "server machine" for TaxCalc.

Additional Requirements

  • A PDF viewer such as Adobe Reader 9.0 or higher (Adobe Reader 11.0.06 or above is required for Windows 8/8.1 and Windows 10).
  • Microsoft Office 2010 or higher (*excluding Office365) for export and Mail Merge features.
    • Microsoft retired support for Office 2007 on 10 October 2017. Following this, our support of Office 2007 is on reasonable endeavours only.
    • *Office365 is not currently a supported operating system
  • An internet connection to allow the product to be licensed to you, receive updates and file online.
  • A minimum screen resolution of 1024 x 768.
Article ID: 2066
Last updated: 08 Oct, 2021
Revision: 61
Views: 10592
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