I am in H1B status with Company A. In order to join Company B, do I need to wait for the H1B change-of-employer receipt notice is issued? Or can I join based on the FedEx tracking confirmation notice that the USCIS received the petition?
Answer One can technically start work for the new employer on the day that USCIS physically receives the H1B change-of-employer petition. The receipt is not required. (A more conservative approach would be to wait for the receipt just to make sure the petition is not rejected...