Once the 457/482 visa has been granted, an employee must start employment with the sponsor either within 90 days of arrival in Australia, or within 90 days of the grant of visa if they are already in Australia at the time of grant.

If the employee is already a 457/482 visa holder when approaching you, and was previously sponsored by another employer on this visa, the employee does not need another 457/482 visa but is only permitted to start employment with your business after the nomination for the relevant position within your business is approved.