Your SIN file will be classified as dormant . You’ll need to reactivate it since no activity as been associated with it .
Your master file will be dead. Everyone has a master file .
Don’t know why people rush to sign up for a SIN if they have no reason too. But it is , what it is .
“ The dormant flag identifies SINs that have not been active for a period of five consecutive years or more—meaning that there was no income-related activity, such as filing taxes, or interaction with government programs during this period. Since then, someone with a dormant flag on their SIN file must provide original proof of identity to have their SIN reactivated, an original birth certificate if born in Canada, or Citizenship and Immigration Canada documents if born outside of the country.
This reactivation is done either in person at a Service Canada centre if they reside in Canada, or by mail if they reside outside of Canada. In addition, to better assist agents in detecting potential identity fraud and theft, the SIN proof-of-identity internal Intranet reference website was developed in 2003. Through this website, agents responsible for the issuance of SINs have access to detailed information on what to look for in identity documents to ensure their authenticity.”
https://www.ourcommons.ca/DocumentViewer/en/41-2/ETHI/meeting-16/evidence#:~:text=The dormant flag identifies SINs,government programs during this period.
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Dormant SIN reversals
Each year, the Canada Revenue Agency (CRA) provides ESDC with a list of SINs that are associated with
[protected information] protected information. ESDC then matches those SINs to records in the SIR and places a "dormant" flag onto that file. Until it is removed, the dormant flag may prevent the SIN holder from receiving benefits from some SIN authorized programs. To remove the flag, the client must visit a SCC where a CSO will ask the client to fill out a questionnaire which will be sent to NIDS for processing. An officer in NIDS will then evaluate whether it is a simple request or a suspicious request using a risk chart, and suspicious requests will be subsequently addressed by the contact centre. In 2014–15 there were 75,556 new dormant flags and 10,889 dormant flagreversals. To streamline the processing of these transactions, CSOs could process non suspicious dormant flag removal requests after validating the identity of the individual. Not only would this be more efficient but it would provide better service for clients requesting routine dormant reversals.”
https://www.canada.ca/en/employment-social-development/corporate/reports/audits/2015-social-insurance-number.html