SARS will complete you tax if your gross income is below
For the 2018 year of assessment (1 March 2017 – 28 February 2018)
R75 750 if you are younger than 65 years.
If you are 65 years of age or older, the tax threshold (i.e. the amount above which income tax becomes payable) increases to R117 300.
For taxpayers aged 75 years and older, this threshold is R131 150.