In toronto, when you take apartment on lease you have to pay 1st month rent + last month rent ( if you are starting your lease from 1st day of month, but if you are moving say on 15th July then you have to pay July 15days rent+ 2nd month + last month).
so in simple you are giving 1 month deposit but you will not pay the last month rent at the time of your actual last month on lease
- I don't see a security deposit much, but the people who take basement or other type of house the the owner may ask 1 or 2 month rent deposit towards security