OSFI is setting a new minimum qualifying rate, or “stress test,” for uninsured mortgages (mortgage consumers with down payments 20% or greater than their home price).

The rules now require the minimum qualifying rate for uninsured mortgages to be the greater of the five-year benchmark rate published by the Bank of Canada (presently 4.89%) or 200 basis points above the mortgage holder’s contractual mortgage rate. “The main effect will be felt by first-time buyers,” says James Laird, co-founder of Ratehub.ca. “No matter how much money they put down as a down payment, they will have to pass the stress test.” The effect of the changes will be huge, resulting in a 20% decrease in affordability, meaning a first-time homebuyer will be able to buy 20% less house, explains Laird.