How the Canadian Mortgage Stress Test Works

Key takeaways

• Federally regulated lenders must qualify most borrowers at a minimum qualifying rate (MQR): the greater of your contract rate plus 2 percentage points, or 5.25%.
• The stress test is about what you could afford if rates rose. You still pay your actual contract rate.
• Lenders also check debt ratios. The FCAC says housing costs shouldn't exceed 39% of gross income (GDS) and total debts shouldn't exceed 44% (TDS).
• OSFI reviews the minimum rate at least annually, so check the current rule before you apply.

If you are applying for a mortgage in Canada, you may be approved for less than you expected. The reason is usually the mortgage stress test. This guide explains the rule, who it applies to, and how to estimate its effect on your borrowing.

What the stress test is

The Office of the Superintendent of Financial Institutions (OSFI) sets a minimum qualifying rate for mortgages through its Guideline B-20. OSFI's page states that the current minimum qualifying rate is the greater of two numbers: your mortgage contract rate plus 2%, or 5.25%. Your lender uses that rate, not your contract rate, when it calculates whether your payment is affordable.

The test is a buffer. You do not pay the higher rate. You only have to show that your finances could handle it.

When it applies

• The Financial Consumer Agency of Canada (FCAC) says the stress test applies to insured and uninsured mortgages at federally regulated lenders, and also when you refinance or open a home equity line of credit.
• OSFI says no stress test is required for an uninsured "straight switch" at renewal, meaning you move to a new federally regulated lender without increasing the loan amount or amortization.
• OSFI reviews the rate at least once a year, so the numbers can change.

The two debt ratios

Lenders usually calculate two ratios using your qualifying payment:

• Gross debt service (GDS): mortgage payment, property taxes, heating and (for condos) 50% of condo fees, as a share of gross household income.
• Total debt service (TDS): everything in GDS plus other debt payments, such as car loans and credit card or line of credit payments.

The FCAC says GDS shouldn't be more than 39% and TDS no more than 44%, though you may still qualify with slightly higher ratios. CMHC's method counts 3% of unsecured credit card and line of credit balances as a monthly payment. Individual lenders apply their own judgment, so results can differ.

Worked example 1: the payment gap

These figures are illustrative. They assume a $500,000 mortgage, a 25-year amortization and a fixed rate compounded semi-annually, which is how Canadian fixed-rate mortgages are typically quoted. Your lender's quote may differ slightly.

Rate	Monthly payment (about)	What it is
4.50%	$2,767	Contract rate in this example
6.50%	$3,349	Qualifying rate (4.50% + 2%)
Difference	$582	Extra monthly payment the lender tests you against

Worked example 2: how much less you can borrow

Suppose a household earns $120,000 a year. At the 39% GDS guideline, the maximum monthly housing cost is $3,900 ($120,000 × 39% ÷ 12). Assume property taxes of $350 and heating of $150 a month. That leaves $3,400 for the mortgage payment.

• At the qualifying rate of 6.50%, a $3,400 payment supports a mortgage of about $507,600.
• If the lender tested you at the contract rate of 4.50% instead, the same payment would support about $614,300.

In this example the stress test lowers the maximum mortgage by about $106,700. It does not change the rate you actually pay.

Debts reduce the result further. If this household also has a $600 monthly car payment, the 44% TDS guideline ($4,400 a month) leaves $3,800 for housing after that debt, which is below the $3,900 GDS amount. Subtracting $500 for property tax and heat leaves $3,300 for the mortgage, which supports about $492,700 at 6.50%.

Worked example 3: the 5.25% floor

If you get a 3.00% contract rate, adding 2% gives 5.00%, which is below 5.25%. The lender would therefore use 5.25%. On a $400,000 mortgage with a 25-year amortization, using the same assumptions, the payment is about $1,893 at 3.00% and about $2,384 at 5.25%, a gap of roughly $491 a month. This rate environment is hypothetical, but it shows why the floor matters when rates are low.

What you can do if you do not pass

• Pay down or consolidate debt. Lower monthly obligations improve your TDS. Credit card and line of credit balances count toward your debt load too.
• Save a larger down payment. A smaller mortgage means a smaller qualifying payment.
• Add an income. A co-borrower with stable income can raise the qualifying amount, but they also share the obligation.
• Buy a less expensive home. The test is about affordability at stressed rates, and a lower price changes the answer.
• Ask about different lenders. The FCAC notes that lenders that aren't federally regulated may also ask you to pass a stress test, so compare each lender's rules and total costs.

Questions to ask your lender

1. What qualifying rate are you using for my application?
2. What are my GDS and TDS ratios, and which expenses did you include?
3. If I am renewing or switching, does the stress test apply to my situation?
4. How are you counting my credit card and line of credit balances?

The stress test is not a guarantee that you can afford a particular payment. It is a minimum check. Build your own budget, including maintenance, utilities, insurance and an emergency fund, before deciding how much to borrow.

Sources

• OSFI: Minimum qualifying rate for uninsured mortgages
• FCAC: Preparing for a mortgage
• CMHC: Calculating GDS and TDS

This article is for general information only and is not financial, tax or legal advice. Rates and limits were last reviewed on October 27, 2026.