Any person who receives income other than remuneration is a provisional taxpayer.
(for example: rental income from a property, interest income, foreign dividends or other income from the carrying on of any trade)

Above is subject to certain exclusions as listed below:

any natural person who on the last day of that year will be below the age of 65 years and who does not derive any income from the carrying on of any business, if—
i) the taxable income of that person for the relevant year of assessment will not exceed the tax threshold; or
ii) the taxable income of that person for the relevant year of assessment which is derived from interest, foreign dividends and rental from the letting of fixed property will not exceed R20 000.
any natural person (other than a director of a private company) who on the last day of the year of assessment will be over the age of 65 years, if the Commissioner is satisfied that such person's taxable income for that year—
i) will not exceed R120 000;
ii) will not be derived wholly or in part from the carrying on of any business; and
iii) will not be derived otherwise than from remuneration, interest, foreign dividends, or rental from the letting of fixed property.

If you are in doubt regarding any aspect of the information displayed above, contact us and we will help you to determine if you are eligible to register as provisional taxpayer