5 November 2012 at 2:18
Regardless of age you will need to pay tax once the actual taxable income, basically profit, exceeds R63 556 per tax year so for now you are free from having to pay tax. There is no lower age limit for running a business, but just watch that you don't go over that threshold and you haven't registered as a taxpayer.
Good going with running a business and being at school! The country needs more young entrepreneurs like you!