Since 2018, the Office of the Superintendent of Financial Institutions (OSFI) has imposed a mortgage stress test on all Canadian borrowers. This rule significantly reduces the amount you can borrow. In 2026, with rates declining, understanding its impact is more important than ever.
1. How the stress test works
The stress test requires you to qualify at the higher of two options: your contract rate + 2% or the floor rate of 5.25%. In other words, even if your bank offers you 3.69%, you must demonstrate you can afford payments calculated at 5.69%.
The goal is to protect borrowers against future interest rate increases. The ratios used are the GDS (Gross Debt Service) capped at 32% and the TDS (Total Debt Service) capped at 40% of gross income.
To know your exact borrowing capacity, read our article on mortgage borrowing capacity in Quebec 2026.
2. Qualifying rate in March 2026
In March 2026, the average 5-year fixed rate is approximately 3.69%. The qualifying rate calculation is straightforward:
3.69%
Contract rate
+ 2%
OSFI buffer
5.69%
Qualifying rate
Since 5.69% > 5.25% (the floor), the 5.69% rate applies. This is the rate the bank will use to assess whether you can afford the monthly payments. To obtain a mortgage pre-approval, this is the rate that will be used.
3. Calculation: impact on a $100,000 salary
Let’s compare borrowing capacity with and without the stress test for a household earning $100,000/year, with no other debt, 25-year amortization and 20% down payment.
Gross salary: $100,000/year — 25-year amortization
With stress test (qualifying rate: 5.69%)
• Monthly gross income: $100,000 ÷ 12 = $8,333
• Max GDS (32%): $8,333 × 32% = $2,667/mo (payment + taxes + heating)
• Max mortgage payment: ~$2,667 − $350 (taxes) − $150 (heating) = ~$2,167
• Maximum mortgage at 5.69%, 25 years: ~$420,000
→ Max purchase price (with 20% down): ~$525,000
Without stress test (actual rate: 3.69%)
• Same max GDS: $2,667/mo
• Max mortgage payment: ~$2,167
• Maximum mortgage at 3.69%, 25 years: ~$510,000
→ Max purchase price (with 20% down): ~$637,500
Buying power difference: $90,000 less in borrowing (from $510K to $420K), or ~$112,500 less in purchase capacity. The stress test reduces your budget by 18%.
4. Strategies to maximize your capacity
Even with the stress test, several strategies can increase your buying power:
Eliminate debts
Pay off credit cards and car loans before applying. Every $300/month in eliminated debt = ~$50,000 more in mortgage capacity.
Increase your down payment
With 20%+ down, no CMHC insurance is required, reducing the total cost of your loan.
30-year amortization
Available for new builds or with 20%+ down payment. Lowers monthly payments and increases qualification.
Co-borrower
Adding a co-borrower (spouse, parent) increases eligible income and therefore borrowing capacity.
Rate shopping
A lower contract rate means a lower qualifying rate (rate + 2%). Every 0.10% less = ~$5,000 more.
5. Stress test and mortgage renewal
Good news for existing homeowners: if you stay with your current lender at renewal, the stress test generally does not apply. You simply need to negotiate the best possible rate.
However, if you switch lenders at renewal (to get a better rate), you will need to re-qualify at the stress test rate. This can be problematic if your financial situation has changed or your debt ratios have deteriorated.
OSFI released updated guidelines in 2026 confirming the 5.25% floor rate will remain. No easing is planned for now, despite repeated industry requests.
Calculate your real borrowing capacity with the stress test included.
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