For the 2019 tax year (i.e. 1 March 2018 to 28 February 2019), if your earnings are less than R500 000 per annum, you do not need to submit a tax return provided that the following criterias are met:
You only received an employment income or salary for the full year of assessment from one employer; and you have no car allowance/company car/travel allowance as well as any other income (e.g. interest or rental income); and you are not claiming tax-related deductions/rebates (e.g. medical expenses, retirement annuity contributions, travel) other than pension contributions made by your employer.