If I have no exemptions or deductions, just a simple paycheck, do I HAVE to file taxes?
You are not required to file a tax return in Canada if you have no taxable income. If you do not file a return you may be requested to by Canada Revenue Agency, and then you'll need to file one. There are hundreds of thousands of Canadian residents who do not file tax returns. The Minister who overlooks the CRA may assess any amount of taxes on any resident whether they file a return or not. There are penalties for failing to file a return or filing late. The penalties are based on a percentage of the taxes owed. If you owe no taxes, then the penalties are meaningless.