Dear GRV,
I would advise you that you should submit your FORM16 along with your Income Tax return receipts. You are right, that FORM 16 give a detailed account of your employer, and your nature of employment (as it mentions the details of your salary and income tax paid). Your FORM 16 will further strengthen the genuineness of your employment, and thus minimize any suspicion in the minds of the canadian high commission officials. With regards, harryk.