On January 1, 2018 the Canadian government applied new guidelines to the Mortgage Stress Test (MST). Basic requirements were already in place for borrowers who put less than a 20% down payment on their home mortgage loan. With the new test guidelines, all conventional mortgage loan borrowers became subject to the new revisions regardless of the down payment amount. The changes included a number of other stringent rules for federally governed lenders to approve mortgages.