Canada Mortgage Stress Test: A Simple Guide

Contract rate versus qualifying rate

The contract rate is the interest rate used for the mortgage you pay. The qualifying rate is a higher test rate used to assess whether the household could handle higher borrowing costs. For example, a 4.50% contract rate plus two percentage points produces a 6.50% qualifying rate.

• 14.50% contract rate → 6.50% qualifying rate
• 13.00% contract rate → 5.25% floor
• 1A higher test rate produces a higher qualifying payment for the same mortgage

How it changes affordability

The calculator first determines how much monthly housing cost fits under the GDS and TDS reference limits. It then converts the mortgage-payment portion into a mortgage amount using the qualifying rate. As the qualifying rate rises, the mortgage amount supported by the same payment falls.

Use scenarios, not a single prediction

Try the current expected rate and then a higher rate to see how sensitive the purchase-price estimate is. This is a planning exercise; renewal rules, insured and uninsured mortgages, and individual lender policies can differ or change.

Worked scenarios at the floor and above it

Assumption A: a 3.00% contract rate plus two percentage points equals 5.00%, so the 5.25% floor is higher and becomes the qualifying rate. Assumption B: a 4.50% contract rate plus two percentage points equals 6.50%, so 6.50% becomes the qualifying rate.

The contract rate still determines the scheduled mortgage payment. The qualifying rate is used only for the affordability test, which is why a household can comfortably budget for the contract payment yet qualify for a smaller mortgage.

Worked example: hold the payment room constant

Suppose the debt-service calculation leaves CAD 3,250 per month for the qualifying mortgage payment and the amortization is 25 years. Using the calculator's monthly-rate method, that payment room supports about CAD 542,347 at 5.25%, CAD 481,334 at 6.50%, or CAD 459,832 at 7.00%. The income, debts and property-cost allowance have not changed; only the qualifying rate has.

This is why comparing only the contract payment can overstate buying power. Enter the contract rate in ToolsFA and leave the stress-test option selected. Then change only the rate and recalculate: the tool will apply the greater of the entered rate plus two percentage points or 5.25% and show the resulting mortgage estimate.

Test the same payment room in the Canada affordability calculator →

Purchase, renewal or straight switch: identify the scenario first

For a new purchase or refinance, plan on the applicable lender qualification process rather than assuming a renewal exception. For an uninsured mortgage moved at renewal from one federally regulated lender to another, OSFI says it does not expect the prescribed minimum qualifying rate to apply when neither the loan amount nor the amortization increases. The federal government also removed the insured-mortgage stress-test requirement for lender switches at renewal under the Canadian Mortgage Charter.

A straight-switch exception is not a promise that a new lender will accept the file or offer the same terms. Increasing the balance or extending the amortization takes the scenario outside the narrow OSFI description, and the lender can still verify the application under its policies. This calculator does not determine exception eligibility, so use its stress-test result for purchase planning and confirm renewal or transfer treatment directly with the lender.

• 6New purchase or refinance: use the lender's applicable qualifying rate and underwriting rules.
• 6Same-lender renewal: ask what review, if any, the lender requires.
• 6Straight switch with no higher balance or amortization: ask the receiving lender whether the current exception applies.
• 6Cash-out, added balance or longer amortization: do not assume the straight-switch exception applies.

What this calculator can and cannot test

ToolsFA applies the published greater-of formula to the rate you enter and uses it in the debt-service calculation. It can show sensitivity to rates, income, debt and property costs.

It cannot determine whether a mortgage is insured or uninsured, whether a renewal or lender switch qualifies for an exception, or how a lender treats unusual income and debts. Confirm those details before relying on the result.

Frequently asked questions