To all those wondering about how postdoc fellowships are taxed - If you hold your award in Canada, postdoctoral fellowships are considered taxable income for Federal income taxes only, and not for Provincial income taxes (so if you are in Quebec, you only pay one tax, the Federal income tax). Some funding agencies do not deduce those taxes from your funding (this is how it words for Quebec provincial postdoc awards like FRQSC; they give you one lump sum of 15k every 4 months and you have to manage it, including putting money aside for taxes; SSHRC awards will now be paid through the host institution, so it may be different going forward for SSHRC, but typically you are not taxed at source with external awards).
Everyone I know (including myself) who held a postdoc external award in Quebec/Canada had to put a certain percentage of their award aside throughout the year and make sure they had enough money to pay their Federal income taxes every spring. So externally funded postdocs in Canada pay Federal income taxes to Canada (Canada considers you an employee), but we do not pay Provincial income taxes (Quebec, for instance, considers you a student, so no taxes). I hope this helps, it was struggle for me to figure out too at the beginning of my postdoc; note that I am not sure how it works if you hold your award outside of Canada, though.