Changing Employers on a 457 - Example
As an example - if John is employed by Company A on a 457, and obtains a new job with Company B, the process would work as follows:
Company B would apply for a nomination for John
Once the nomination is approved, John could work for Company B. John would not need to apply for a new 457
If John then gives notice to Company A, he can serve his notice period with Company A before working with Company B
Note, however, that if John gives notice too early and the nomination takes some time to come though, he may be in breach of the 60 day limitation on being out of work
The above process avoids the necessity of applying for a new 457, thus avoiding paying the lodgement fee for the visa and the 457 holder redoing medicals.