Mortgage Stress Test Calculator Canada 2026
Find your maximum qualifying mortgage under OSFI B-20. Enter your income, rate, and debts — we calculate GDS, TDS ratios, and your maximum purchase price.
How the 2026 Mortgage Stress Test Works
The Canadian mortgage stress test requires all federally regulated lenders (banks) to qualify you at a rate higher than the one you’ll actually pay. The qualifying rate is: max(contract rate + 2%, 5.25%). If your bank offers 4.29%, your qualifying rate is 6.29% — your maximum mortgage is based on what you could afford at that higher rate.
The GDS ratio (Gross Debt Service) caps monthly housing costs — mortgage payment at the qualifying rate, property tax, heat, and 50% of condo fees — at 39% of gross monthly income. The TDS ratio (Total Debt Service) adds all other debt payments and caps the total at 44%. Whichever limit is more restrictive determines your maximum mortgage.
Two recent changes expanded access: (1) as of August 2024, insured first-time buyers can use 30-year amortization for new construction; (2) as of November 2024, existing borrowers switching lenders at renewal no longer face the stress test if the loan amount and amortization stay the same. The qualifying rate itself remains unchanged per OSFI January 2026.
Provincially regulated credit unions are not subject to OSFI’s B-20 guideline and may qualify you at more flexible rates — sometimes just the contract rate. If you’re having difficulty qualifying at a bank, explore credit unions or work with a mortgage broker who has access to both regulated and alternative lenders.
What the qualifying rate actually is
Under OSFI's Guideline B-20, a federally regulated lender must qualify you at the greater of your contract rate plus 2%, or 5.25% — whichever is higher. You do not pay that rate. You are only tested against it, to check you could still carry the mortgage if rates rose.
The practical effect is that the stress test cuts the mortgage you qualify for by roughly 20% compared with qualifying at your actual rate. Someone approved for $600,000 on paper at their contract rate might qualify for around $480,000 once tested. That gap is the single biggest reason pre-approvals come in lower than buyers expect.
GDS and TDS — the two ratios that decide it
The stress test is applied through two debt-service ratios, both calculated at the qualifying rate rather than your real one.
Housing costs as a share of gross income: mortgage principal and interest, property tax, heating, and half of any condo fees.
Everything in GDS plus all other debt payments: car loans, credit card minimums, lines of credit, student loans and support payments.
TDS is where most applications fail, and it fails for a reason people rarely anticipate: a line of credit counts even when the balance is zero, because lenders assess a payment on the available limit. Closing unused credit before applying can do more for your approval than earning more.
Who is exempt, and who isn't
The stress test applies to all federally regulated lenders — the big banks and most credit unions that are federally chartered. Provincially regulated credit unions and private lenders are not bound by B-20, which is why they sometimes approve borrowers the banks decline. That flexibility usually comes with a higher rate, and it is worth asking whether the extra you will pay over the term is worth the larger approval.
Switching lenders at renewal is the exemption that matters most. Since late 2024, borrowers renewing an insured mortgage can switch to a new federally regulated lender without re-qualifying under the stress test, provided the amortisation and loan amount are not increased. That removed a long-standing trap where homeowners were effectively locked in and had to accept whatever their existing lender offered. Ask about it explicitly at renewal — it is not always volunteered.
Improving your result before you apply
- Clear or close unused revolving credit. Lenders count the limit, not the balance.
- Pay down the car loan. A $600 monthly payment can reduce your qualifying mortgage by well over $100,000 through TDS.
- A larger down payment cuts the amount you must qualify on. Crossing 20% also removes default insurance — though insured mortgages often carry lower rates, so run both.
- Longer amortisation lowers the qualifying payment — 30 years instead of 25 improves the ratios, at the cost of substantially more interest.
- A co-signer adds income but also their debts, so it can help less than expected.
For the full walkthrough, see our mortgage stress test guide, and check what the payment actually looks like with the mortgage calculator.