How much rent is allowed before tax and when do we have to register only once the rent is paid?

Hi Tim I have a student who is paying me rent in a 2 bedroom semi-detached. He started paying rent in February 2015 when do I have to register as a provisional taxpayer? Is it only once you've earned more than R30 000 for that year? Then I will have to register next year then in Feb 2016?

Yes, you would only need to register once you hit that threshold. However you will still need to declare the rental income less any expenses in each tax return.