While it’s unlikely that they do so with any great degree of enthusiasm, the vast majority of Canadians prepare their annual tax return each spring and file that return on time. That’s necessary, because the Canadian tax system is a “self-assessing” one, in which the onus is completely on the taxpayer to ensure that a return in prescribed form is completed and provided to the tax authorities. On that return, the taxpayer provides a listing of income earned during the previous calendar year as well as any claims made for tax deductions and credits. The end result of that process is a determination of the amount of tax owed for the year; any such amount must then, of course, be paid on or before April 30.