Amendments apply only to the mistakes that are made by IRCC when your documents were issued. For example, if you are eligible to work in Canada but your study permit states you "may not work" or "may not accept employment", you'll need to amend your study permit to get the right wording to apply for a SIN in order to work.
|When to apply||As soon as possible|
|Processing time||1 – 2 months|
|How to apply||
By paper only. Mail to:
Amendment to the Record of Landing, Confirmation of Permanent Residence or Temporary Resident Document Operation Support Centre (OSC)
Request to Amend the Record of Landing, Confirmation of Permanent Residence or Valid Temporary Resident documents [IMM 1436]
Note: Make sure you use the newest form available here on the IRCC website.