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I wrote current date and then attached a letter of explanation just to be on the safer side, got my work permit hard copy today in the mail. one year extesion
A little confused about what you meant here please. And when did you submitted application for the extension? How long it took to receive hard copy?
 
Quick question: I applied for work permit renewal on Oct 19th, received extension email on 20th. Can I use the extension letter to extend/renew of Social insurance number or do I just present it to my employer pending approval/issuance of my work permit?
 
Quick question: I applied for work permit renewal on Oct 19th, received extension email on 20th. Can I use the extension letter to extend/renew of Social insurance number or do I just present it to my employer pending approval/issuance of my work permit?
You can try but last time i went to renew SIN based on my work permit extension letter and they refused to renew, they asked to bring the original hardcopy. Secondly it depends on the employer too, I heard some employer accept the extension but some employers ask for SIN renewal too