Log into your SARS eFiling pofile.
Navigate to your Tax Return which was auto-assessed.
You can do this by clicking "Returns" (top menu), then "Returns History" (side menu), then "Personal Income Tax ITR12" , then select the the relevant ITR12.
You will see the Income Tax Workpage which looks like this:
Click "Request For Extension"
Enter a valid reason why you will not be able to submit within the 40 working day deadline.
Choose which date you’d like to file (this can't be more than 40 working days since your original deadline), then click "Submit".
You should immediately see the follow message pop up:
Return to the Income Tax Workpage, and click on "Request for Extension" again to check it went through successfully.
The following error message should pop up:
Check for SARS letters, you can do this by going to "SARS Correspondence", then "Search Correspondence".
You should receive receive a letter within a few hours:
You can then continue to file your tax return.