HMRC Basic Paye Tools not working on iMac: 'Starting application' hangs

HMRC Basic Paye Tools has stopped working on Imac running Golden Gate previously Tahoe 26.7 not working on that also. Hangs on "starting application". All Copilot and web fixes don't work. Anyone else have this problem? Or a fix?


[Re-Titled by Moderator]

Original Title: HMRC Basic Paye Tools

Posted on Sep 22, 2026 8:26 AM

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Question marked as Top-ranking reply

Posted on Sep 29, 2026 5:15 AM

This has just appeared on the HMRC website but doesn't seem to work.


Basic PAYE Tools does not open after an Apple Mac operating system update

We are aware that some customers have been unable to open Basic PAYE Tools after updating their Apple Mac operating system (macOS). This issue is known to affect customers using the latest macOS operating system versions: 15 ‘Sequoia’, 26 ‘Tahoe’ and 27 ‘Golden Gate’.


The following workaround should enable you to access Basic PAYE Tools. These steps will need to be carried out each time you need to use Basic PAYE Tools:


1. Close Basic PAYE Tools completely and open ‘Terminal’ on your Apple Mac (select ‘Go’ at the top of your desktop and then Applications > Utilities > Terminal).

2. Copy and paste this command, then press Enter:

cd “/Applications/Basic PAYE Tools.app/Contents/Helpers/rti.app/Contents/MacOS”

3. Next, copy and paste this separate command, then press Enter:

./rti runserver 46729

4. Leave ‘Terminal’ open’ and then open an internet browser (for example, Safari) and copy and paste the following website into the address bar, then press Enter:

http://127.0.0.1:46729


Basic PAYE Tools will now show in the internet browser and can be used as normal.


Please do not open the normal Basic PAYE Tools application while this is running. Through the entire time of using Basic PAYE Tools in the internet browser, make sure you keep the ‘Terminal’ open.


Once you have finished using Basic PAYE Tools, press Ctrl+C in ‘Terminal’ to stop the server and you can close the ‘Terminal’ window.

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HMRC Basic Paye Tools not working on iMac: 'Starting application' hangs

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