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即联邦税务局的notice of assessment.官方链接在此：
http://www.cic.gc.ca/english/inf ... 5ETOC.asp#appendixA

Additional documents of proof of residence in Canada in the past five (5) years

Include the following with your application:

Photocopies of all pages of all passports you held in the past five (5) years (if your stamps are not in English or French, please have them translated, see section on Translation of documents), and
A copy of one of the following:

Other Income Tax assessments issued by Canada Revenue Agency within the past five (5) years, or
transcripts from a recognized post-secondary institution in Canada verifying attendance within the past five (5) years, or
for all school-aged children, written records verifying attendance within the past five (5) years.
Format: Clear and legible photocopy

在各位没有入籍的情况下，要保留加拿大移民身份，请记住移民局是你们的“上级”，“上级”要你们做啥，必须照办。入籍之后，N多年人不在加拿大，不报税都无妨，最多影响老人金领取。