沒有那事，加拿大不是美國（美國公民綠卡者永遠要報稅），這裏有明文規定的：

這個是加拿大官方規定，列出什麽人需要報稅：

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/you-have-file-a-return.html

Do you have to file a return?

File a return for 2018 if:

• you have to pay tax for the year

• want to claim a refund

• you want to claim the working income tax benefit (WITB) or you received WITB advance payments in the year

• you or your spouse or common-law partner want to begin or continue receiving the following payments (including any related provincial or territorial payments):
  • Canada child benefit (CCB)
  • GST⁄HST credit
  • guaranteed income supplement (GIS)

If you have a spouse or common-law partner, they also have to file a return.

• the CRA sent you a request to file a return

• you and your spouse or common-law partner are jointly electing to split pension income. See lines 115, 116, 129, and 210

• you disposed of capital property (which could be a principal residence) or you realized a taxable capital gain in the year

• you have to repay all or part of your old age security or employment insurance benefits. See line 235

• you have not repaid all the amounts you withdrew from your registered retirement savings plan (RRSP) under the Home Buyers’ Plan or the Lifelong Learning Plan

• you have to contribute to the Canada Pension Plan (CPP) for 2018. This can apply if your total net self-employment income and pensionable employment income is more than $3,500. See line 222

• you are paying employment insurance premiums on self-employment income or other eligible earnings. See lines 317 and 430

• you have incurred a non-capital loss in the year that you want to be able to apply in other years. See line 236

• you want to transfer or carry forward to a future year the unused part of your tuition fees. See line 323

• you want to report income that would allow you to contribute to an RRSP, a pooled registered pension plan (PRPP), or a specified pension plan (SPP) to keep your maximum deduction limit (see Schedule 7) for future years up to date

• you want to carry forward to a future year the unused investment tax credit on expenditures you incurred during the current year. See line 412