The Canadian government requires most citizens to file an income tax return annually. Even if you are new to Canada or just starting your first job you still need to file a return especially if any of the following applies to you:
Whether or not you live in Canada does you will still have to file a Canadian Income Tax return, but it will affect how you file, what income you need to report and which credits or deductions apply to you. If you come under any of the criteria above you have to file a tax return. Also if you live abroad but you receive income from your business or investments in Canada you will need to file a return.
Your age has not bearing on your requirement to file a tax return as long as you fit one of the criteria above. Students are also not exempt, they must file a return if they have earnings from a summer job even if they are still in school and all must file a return as soon as they start earning income.
Sometimes it is in your best interest to file a return even if you are not required to. Some examples where this would be the case are;
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