TaxCalc SSL Errors on macOS High Sierra

Unfortunately, macOS High Sierra 10.13.6 is a retired Operating system that Apple stopped supporting around December 2020, and as a result is no longer supported by TaxCalc.

If you have a macOS High Sierra machine and try to launch the TaxCalc application, the following SSL error will occur:

Please refer to the below TaxCalc System Requirements and Retired Operating System knowledgebase articles for more information on this:
System Requirements for TaxCalc
Retired Operating Systems

To check if your macOS High Sierra machine is capable of upgrading to a newer macOS version, click the apple icon on the top left of the screen > About This mac > Software Update > and the App Store should open and let you know if there are any newer macOS upgrades available for your machine.

Please note: You would need to contact Apple before upgrading your MacOS High Sierra machine (if you have the option of upgrading), as they would be able to advise on how to take a full system safety backup before upgrading your machine.

If you do not have the option to upgrade your machine to a newer macOS version, you will need to migrate TaxCalc and your TaxCalc data to another machine (Another macOS machine running a newer macOS version or a Windows or Linux machine), in which case please perform the below steps on your macOS High Sierra machine:

In some cases, you may need a new computer.

Note: If you simply need to view any returns in TaxCalc on your macOS High Sierra machine (in a read only state), you can simply turn the internet off, load TaxCalc to view the returns, then when you are done, close TaxCalc, switch the internet back on (steps for this, including how to switch internet off then on, are a little further down this article).
Note: This does not apply to TaxCalc CloudConnect customers, as an active internet connection is needed to access the TaxCalc CloudConnect database (a system upgrade or TaxCalc migration would be necessary for CloudConnect Customers).

•    Close the TaxCalc SSL error, by clicking the Apple icon on the top left of the screen, click Force Quit > Click TaxCalcHub > then click Force Quit, then Force Quit again.

•    Save and close any other non TaxCalc related work/applications that you have open, then temporarily switch off your internet connection, by clicking the Apple icon on the top left of the screen > System Preferences > Double Click Network > Click the small cog wheel > Click Make Service Inactive, then click Apply:
 

•    Load the TaxCalc application, then refer to below relevant knowledgebase article that applies to you:

Standalone Personal Customers:
Moving TaxCalc to a new computer (Individual, Partnership and Limited Company users)

Standalone Practice Customers:
Moving TaxCalc to a new Mac (Practice – standalone user)

VAT Filer Customers:
How to backup and restore my VAT information - non-practice user

Once you have performed the relevant steps in the TaxCalc application, close TaxCalc, then re-enable your internet connection by performing the below steps:

•    Click the Apple icon on the top left of the screen > System Preferences > Double Click Network > Click the small cog wheel > Click Make Service Active, then click Apply:

Once you have successfully fully migrated your TaxCalc data to another machine, you can uninstall TaxCalc from your macOS High Sierra machine by performing the steps in the below knowledgebase article:

How do I manually remove TaxCalc from my Mac?

Note: If you are moving TaxCalc to another machine and get a Licencing Error stating ‘you have exceeded your permitted copied of TaxCalc’ or similar error, please perform the below steps then try licencing TaxCalc again:

•    Exit the TaxCalc licencing screen, click on this link Reset my licensed nodes now then log in to your TaxCalc website account.
•    When you see the following screen, click Clear Licenced Machines:

If you need any further support please contact the TaxCalc support team at support@taxcalc.com