Have you ever wondered why your neighbour or brother-in-law just got a lower or higher interest rate on a new mortgage than you just got?
Reasons for differences, and sometimes they are significant, can be many and varied, including your income, income source, province of residence, type of property being mortgaged, credit score, specific privileges required, and much more.
To help explain all this, here is a good article from the Globe and Mail describing why once you have chosen the term and rate type for your mortgage, you may find that interest rates for that same term can vary by a percentage point or more.