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If I have no exemptions or deductions, just a simple paycheck, do I HAVE to file taxes?
If you took advantage of options like a home buyers plan (HBP) you definitely need to file since you must designate how much of the plan to repay.  Your employer does not know about what you do with your money so cannot take this into account for the withheld taxes.  If you do not report repayment of the HBP it will be treated as a withdrawal from your RRSP i.e. additional income for that tax year.