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Old SIN number or get new one?

armoured

VIP Member
Feb 1, 2015
15,370
7,835
My spouse will be landing in Canada in the coming months. Long story short, she had previously immigrated on her own before we knew one another (more than 12 years ago), and did not remain or stay any significant period of time in Canada. (Her case is in order - she renounced her PR status years ago and the new PR / spousal sponsorship is done.

I believe she would have received a SIN at that time but effectively never used it (we are checking to see if we still have it).

Should we plan on her applying for a new SIN number on arrival, unconnected to the old one? Do old ones get cancelled? Would it have been cancelled or somehow marked as not valid for work when she renounced her previous PR status? Or would we need to 'activate' it somehow?

Is there some way to find out the old SIN number if we cannot find it? She almost certainly does not have the SIN card.

This may be over-thinking it since in reality, the old one would never have been 'used' in any meaningful sense. (We will be applying for sin numbers for our children on arrival anyway, so not worried about the extra time on arrival - would just like to avoid any bureaucratic issues down the road.
 

Copingwithlife

VIP Member
Jul 29, 2018
3,929
1,899
Earth
She would still use her old SIN # . Individuals assigned regular SIN #, those that do not start with a 9 are rarely assigned a totally brand new SIN. When they are assigned a brand new SIN, it’s typically done in cases such as identity theft .
Her old SIN is dormant , and will just be brought back to life .
As to finding her old SIN, she could go to a Service Canada office and see if they can find it for her, but only after providing identification. SIN are under ESDC domain, not IRCC. Failing that, write into ESDC SIN

If you don't remember your SIN, you can find it on your income tax return or you can request a confirmation of your SIN from Service Canada. For more information on how to get a confirmation of your SIN, see the What you need before you apply web page.

https://www.canada.ca/en/employment-social-development/services/sin/before-applying.html
 
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