When we are supplied with ad hoc services, such as web design, or workshop facilitation, there are constantly questions around who should be paid through HR and who by Purchase Order. Paying by HR means that people often have to wait longer, and then they get taxed at 25% as well.
It is not UCT's role to police whether such people pay their tax or not. But if we don't satisfy ourselves that the service provider is entitled to be treated as independent, then we (as UCT) become liable for the taxes not deducted. This is why we have to be very sure of ourselves before submitting anything for payment via a Purchase Order.
The default position is very simple. If someone argues that they shouldn't be paying tax, they should be advised to first approach the Receiver of Revenue. If the Receiver agrees, s/he will issue a tax directive to that effect, and UCT will accept a copy of that directive as the basis for its action.
Where there is no tax directive, and the service provider insists that their circumstances should allow them to be treated as independent people, and not as employees, they should be asked to complete a CHED contractors questionaire and submit it to the Faculty Finance Manager with their invoice. This questionaire MUST be signed by the person claiming independent status. We can, if challenged, then show that we have something solid on which we made any decision.