millit said:
This site does not mention any requirement for tax documents
.cic.gc.ca/english/study/study-how-documents.asp
Like I have said before, TAX documents are country-wise requirement and that is only mentioned in the country's specific checklist. I don't know which country you are from but just in case, if you are from india, refer to this checklist:
http://www.vfs-canada.co.in/images/Study%20Permit%20Checklist-General.pdf
Like in the general checklist (http://www.cic.gc.ca/english/pdf/kits/forms/imm5483e.pdf), it is mentioned that "Any additional documents required by the responsible visa office".