How the Canadian mortgage stress test works and why borrowers are qualified at a higher rate than the one in the contract.
The mortgage stress test is the practice of qualifying a borrower at a higher interest rate than the contract rate to see whether the borrower could still carry the mortgage under tougher conditions.
The stress test can reduce the amount a borrower qualifies for, shape the lender choice, and influence whether a switch, refinance, or purchase still works.
The exact rule depends on the type of mortgage and lender. As of January 29, 2026, OSFI says federally regulated lenders must qualify uninsured mortgages at the greater of the contract rate plus 2 percentage points or 5.25%. Borrowers often hear that higher qualifying rate referred to as the stress test.
The stress test does not mean you will pay that higher rate. It is a qualification tool. The real payment is based on the contract you actually sign.
If a borrower is offered a 4.80% uninsured mortgage at a federally regulated lender, the lender may still qualify the borrower at 6.80% because that is contract plus 2% and is higher than the current 5.25% floor.
The stress test is not a second mortgage rate added after closing. It is a screening tool used before approval.
Borrowers also sometimes assume it applies identically in every situation. That is not true. Lender type, insured vs. uninsured status, and special cases such as an uninsured straight switch can change the treatment.
Regulatory treatment can change, and lender policy still matters. A borrower who passes the formal stress test can still be declined for other underwriting reasons.