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When you hit one year of living together, you should update CIC that you are common law and update CRA . You don't need to update PNP office. If your partner is already PR , you just need to send letter of explanation and attach copy of his PR card through webform.
Hi Miss bee,

Thank you for your quick response! I still don’t have my Application number because I haven’t received my AOR. Should I still update IRCC through the web form? Also, updating CIC should I use this email: question@cic.gc.ca (it was the only contact I could find online). And send a letter of explanation just stating my update of becoming common law? Do I need to include the signed and notarized document confirming common law (Statutory Declaration of Common-Law Union (IMM 5409)) and other proof like rental agreement or will attaching a letter and his PR card be enough? Since we became common law about a month ago, will there be a problem in the reporting delay?

I appreciate the help with these questions!