If you have employees who earn a salary of less than R6,509 per month and they are employed for a total of more than 24 hours in a month within your organisation, then you are obliged to register such employees with Ufiling.
If you have employees that earn more than R6,509, then such employees must be registered for U.I.F with the South African Revenue Services.
If you have a mix of both, then registrations for UIF have to be done at both SARS as well as at the department of labour concurrently.