Robert McLister·General·October 28, 2008High Ratio Mortgage A mortgage with a loan-to-value over 80%. In other words, a mortgage where the borrower has put down less than 20%. In Canada, most high ratio mortgages have to be insured against default. This requires the borrower to pay mortgage default insurance premiums to an insurer like CMHC, Genworth, or Canada Guaranty. Like news like this?Join our CMT Updates list and get the latest news as it happens. Unsubscribe anytime. SUBSCRIBE! Thank you for subscribing. One more step: Please confirm your subscription via the email sent to you.