 In a statement, the OSFI has stated that the guideline will “provide clarity about best practices in respect of residential mortgage insurance underwriting, which contribute to a stable financial system.” This comes after several years of federal government scrutiny over the CMHC, with former Finance Minister Jim Flaherty musing publicly as far back as 2012 about privatizing the Crown corporation.In an attempt to cool down the real estate prices in Canada, Ottawa introduced a mortgage stress test effective 17 October 2016.Under the stress test, every home buyer who wants to get a mortgage from any federally regulated lender should undergo a test in which the borrower's affordability is judged based on a rate that is not lower than a stress rate set by the Bank of Canada.