1.The criteria that apply to overseas standard business sponsors seeking to vary/extend the term of their sponsorship approval replicate the criteria for approval to become a standard business sponsor.
2.The purpose of this difference is to prevent a multi-national company with a business operation in Australia from using its overseas business operation to become the standard business sponsor (thereby circumventing the training and attestation requirements) and then placing the Subclass 457 visa holder in the Australian business operation.
