Tax payable on buy to let property

I have invested in 4 properties to rent out to provide me with income. The total income I am recieving each month is R 18 000. I am 60 years old and have no other income. The properties are all in my name. How much tax will be payable on this monthly amount considering that this is my primary income.

Please make use of our SARS income tax calculator to work out how much tax is needing to be paid. You will also need to register as a Provisional Taxpayer