Medical evidence required for sick leave

In order for an employee to take accrued paid sick leave under the Fair Work Act 2009 he or she must not be fit for work because of a personal illness or injury.
In order to exercise this entitlement, the Act provides that the employee must provide his or her employer with evidence that “would satisfy a reasonable person” that sick leave is being taken for this reason.
The genre of evidence which an employee must provide in order to earn an entitlement to take paid sick leave will often be determined by an applicable industrial instrument, a modern award or enterprise agreement.
However, even in the event that an employer has a right under a modern award or enterprise agreement to require an employee taking sick leave to provide a certain kind of medical evidence , the Act requires that the employer exercise that right reasonably.