Does a capital gain force me to submit a tax return?

I have received an Allan Gray IT3(c) tax certificate for capital gain/loss for 2016 for R 121556,98. Do I have to submit this to SARS tax return as am retired

Yes you will still need to submit a tax return to SARS unfortunately in order to remain compliant. However you will not have to pay an tax on this amount if this is the only revenue or income earned. Please click the link to Register for TaxTim so we can help you file your tax return with SARS.