Mortgage Stress Test in Canada: How It Works
Loading article…
The mortgage stress test decides how much you can borrow, not the interest rate you pay. Your lender approves the loan only if you could still afford the payments at a higher rate than the one in your contract. As of October 18, 2026, that qualifying rate is the greater of your contract rate plus 2% or 5.25%.
This guide explains how the mortgage stress test works for insured and uninsured mortgages, shows how much it reduces a typical budget, and lists the cases where it no longer applies. For rates and lenders, start with our mortgages hub, and run your own numbers in our mortgage affordability calculator.
What is the mortgage stress test?
The stress test is a minimum qualifying rate. Your lender calculates your debt ratios as if your mortgage carried that rate, even though you will pay the lower contract rate. If your ratios pass at the higher rate, you get the loan.
The goal is simple: make sure you can absorb a rate increase at renewal. A borrower who qualifies with a 2-point cushion is less likely to default if rates rise during the term.
The current qualifying rate
The Office of the Superintendent of Financial Institutions (OSFI) sets the rule for uninsured mortgages at federally regulated lenders. Its page, last updated January 29, 2026, sets the minimum qualifying rate as the greater of:
- Contract rate plus a buffer: your mortgage contract rate plus 2%
- Floor rate: 5.25%
Insured mortgages, those with less than 20% down, follow the same formula. CMHC, for example, requires lenders to calculate your debt ratios with the same buffer and the same floor. The table below shows what that means for a few example contract rates. They illustrate the formula and are not current market offers.
| Example contract rate | Contract rate + 2% | Qualifying rate used | Which part applies |
|---|---|---|---|
| 2.99% | 4.99% | 5.25% | Floor |
| 3.25% | 5.25% | 5.25% | Both are equal |
| 3.89% | 5.89% | 5.89% | Contract rate + 2% |
| 4.50% | 6.50% | 6.50% | Contract rate + 2% |
| 5.25% | 7.25% | 7.25% | Contract rate + 2% |
How lenders apply the stress test
Lenders use two debt ratios. The gross debt service (GDS) ratio compares your housing costs to your gross income. The total debt service (TDS) ratio adds your other debts, such as car loans, student loans, and credit card payments.
For insured mortgages, CMHC sets these maximums as of October 18, 2026:
- GDS ratio: 39% of gross income
- TDS ratio: 44% of gross income
- Credit score: at least one borrower or guarantor at 600 or higher
The stress test plugs the qualifying rate, not your contract rate, into the mortgage payment used in both ratios. A higher rate means a higher payment, which means a smaller loan fits under the same ratio. Lenders often apply their own, sometimes stricter, limits on uninsured mortgages.
A worked example
Take a household earning $110,000 a year. It expects $350 a month in property tax and $100 in heating, and it pays $500 a month on a car loan. Its lender offers a 5-year fixed rate of 3.89%, so the qualifying rate is 5.89%.
At a 44% TDS limit, the household can spend $4,033 a month on housing and debts. After property tax, heating, and the car loan, $3,083 remains for the mortgage payment. Here is how much that payment supports, using Canadian semi-annual compounding:
- 25 years, at the 5.89% qualifying rate: about $486,900
- 25 years, if the test used the 3.89% contract rate: about $592,900
- 30 years, at the 5.89% qualifying rate: about $524,400
The stress test cuts this household's maximum loan by roughly $106,000 on a 25-year amortization. The actual payment, however, is still calculated at 3.89%. The rate in this example is hypothetical; your lender's offer and your province's taxes will change the result. Our mortgage payment calculator shows the payment at your real rate.
Insured vs uninsured mortgages
The formula is the same, but the source of the rule differs. For an uninsured mortgage, with 20% or more down, OSFI Guideline B-20 sets the expectation for federally regulated lenders such as the big banks. For an insured mortgage, the federal government's insurance rules and the insurers' own underwriting apply the same qualifying rate.
Credit unions regulated by a province are not bound by OSFI's guideline. Some apply similar qualifying rules, others set their own. Alternative lenders and private lenders also follow their own criteria, usually at a higher interest rate. Our guides to B lender mortgages and private mortgage lenders explain the trade-offs.
Fixed and variable rates
The stress test applies to both. For a variable-rate mortgage, the lender adds 2% to the variable contract rate and compares the result with the 5.25% floor. A very low contract rate does not escape the test, because the floor then takes over. Our comparison of fixed vs variable mortgages covers the other differences.
Does the stress test apply at renewal?
If you renew with your current lender, you do not requalify under the stress test. The question used to matter only when you wanted to move to another lender for a better rate.
Since November 21, 2024, OSFI no longer expects lenders to apply the minimum qualifying rate to an uninsured straight switch at renewal. A straight switch means moving your uninsured mortgage from one federally regulated lender to another with no increase in the amortization period or the loan amount. Insured mortgage holders can also switch lenders at renewal without a new stress test, under a measure announced in Budget 2024.
A refinance is different. If you borrow more, extend the amortization, or take equity out, you go through the stress test again. Before your term ends, compare offers with our mortgage renewal calculator and our tips for negotiating a mortgage renewal.
How to pass the stress test
If the stress test leaves you short, you can change the inputs. Each of these moves either lowers the qualifying payment or raises the income side of the ratios:
- Pay down other debts first: every $100 of monthly car or card payments you remove frees $100 under the TDS ratio.
- Raise your down payment: a smaller loan means a smaller qualifying payment, and 20% down removes mortgage insurance.
- Choose a 30-year amortization if you qualify: first-time buyers and buyers of new builds can stretch an insured mortgage to 30 years.
- Add a co-borrower: a second income counts in both ratios, but the co-borrower also takes on the debt.
- Target a lower price: use the result of the affordability calculator as a ceiling, not a goal.
- Check your credit report: errors can push your score below a lender's threshold, and they are free to dispute.
Conclusion
The mortgage stress test does not change what you pay; it changes how much you can borrow. As of October 18, 2026, you must qualify at the greater of your contract rate plus 2% or 5.25%, whether your mortgage is insured or not. In our example, that rule removed about $106,000 of borrowing power from a household earning $110,000.
Run your numbers before you shop. Our affordability calculator applies the qualifying rate for you, and a mortgage pre-approval confirms what a lender will actually offer.
To follow rate changes and new mortgage rules, sign up for the Ratesopedia newsletter.
Frequently asked questions about the mortgage stress test
What is the mortgage stress test rate today?
As of October 18, 2026, the qualifying rate is the greater of your contract rate plus 2% or 5.25%. OSFI confirmed this rule for uninsured mortgages on its page updated January 29, 2026, and insured mortgages use the same formula. If your lender offers 4.20%, you qualify at 6.20%; if it offers 3.00%, you qualify at the 5.25% floor. Our affordability calculator applies the rule for you.
Does the stress test apply if I put 20% down?
Yes. A mortgage with 20% or more down is uninsured, and OSFI Guideline B-20 expects federally regulated lenders such as the big banks to apply the minimum qualifying rate. Provincially regulated credit unions and private lenders are not bound by B-20 and may set their own rules. Compare options in our guide to mortgage brokers vs banks.
Do I have to pass the stress test when I renew?
Not if you renew with your current lender. Since November 21, 2024, you also skip it when you make a straight switch of an uninsured mortgage to another federally regulated lender, as long as you do not increase the amortization or the loan amount. Insured mortgages can switch without a new test as well. A refinance, however, requires a new stress test. See our guide to negotiating your mortgage renewal.
How much does the stress test reduce what I can borrow?
It depends on your income, debts, and rate. In our example, a household earning $110,000 with a $500 car payment could borrow about $486,900 over 25 years at the 5.89% qualifying rate, compared with about $592,900 if the lender used the 3.89% contract rate. That is a gap of roughly $106,000. Try your own figures in our affordability calculator.
Can a 30-year amortization help me pass the stress test?
Yes, because spreading the loan over 30 years lowers the qualifying payment. In our example, the same household could borrow about $524,400 over 30 years instead of $486,900 over 25 years. As of October 18, 2026, insured 30-year amortizations are open to first-time buyers and buyers of newly built homes. Use our mortgage payment calculator to compare the total interest.
Does the stress test apply to variable-rate mortgages?
Yes. The lender adds 2% to the variable contract rate and uses the result if it is higher than 5.25%. Because the floor applies to every mortgage, a very low variable rate does not lower the qualifying rate below 5.25%. Our comparison of fixed vs variable mortgages explains which suits your situation.
Read next
