Depending on how much you have saved and whether you are being supported with a gift from the bank of mom and dad, what you are able to put towards a down payment will vary. In Canada, the minimum down payment is 5% of the purchase price, however there are also benefits to putting down over 20%.
Before the creation of the Canadian Mortgage and Housing Corporation (CMHC), the minimum, 20% down was a major barrier to many Canadians wanting to purchase a home. To combat this barrier and encourage home ownership, CMHC began offering mortgage default insurance; if you default on your payments, they will reimburse the lender. They charge an insurance premium on mortgages offer by lenders with smaller down payment and lower interest rates. This premium, of course, covers any losses they may incur if a mortgage default does occur.
So, why put down a larger down payment? Your mortgage amount will be less, payments smaller, and less interest paid over the life of your mortgage. With over 20%, you will save money by not having to pay any mortgage insurance premiums. Between 5% and 20%, the more money down, the lower the insurance premium.
It is also important to make sure to account for closing and other unexpected costs, so completely draining your savings towards a down payment is not the best course of action.