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Filing due dates of your tax return (as individuals):

http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/ll-dts/frms-eng.html
 
I got my T4 form from my employer but the employment income does not equate to what I have calculated.
To to make sure- From what date (start) to what date (end) does does employment income period cover? Ie. In Australia, it is 1st July 2011 (Start) to 30th June 2012 (End).