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Mortgage Squad Advisors
Vaughan, Ontario · FSRA #13737

Mortgage Stress Test Calculator

Enter your rate and mortgage amount to see the qualifying payment lenders actually use — and exactly how much the stress test cuts your borrowing power.

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Mortgage stress test calculator: what does the stress test do to your payment?

Fact-checked by Surrayya Afzal, Principal Broker, FSRA #M14001433·Last reviewed October 2026
The short answer

You qualify at the greater of your rate + 2% or 5.25%, so a 4.39% offer is tested at 6.39%. That higher payment, not your real one, sets your maximum mortgage. To check income and debts, use the affordability calculator. Some provincially regulated credit unions set their own qualifying rules.

Your numbers

$620k
4.14%
25 yrs
Qualifying rate
6.14%
vs. 4.14% contract rate
The math
Payment at contract rate$3,309
Payment at qualifying rate$4,019
Monthly difference$710

What the stress test costs your borrowing power

The $3,309/mo your contract rate produces carries a far smaller mortgage once a lender re-prices it at the 6.14% qualifying rate.

At your contract rate · 4.14%$620,000
Stress-test qualifying · 6.14%$510,459
Borrowing-power gap
$109,541less mortgage — about 18% — for the very same monthly payment.
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Read the full explanationThe rules behind the numbers, with worked examples.

Why the stress test exists, and why the gap appears

The Canadian mortgage stress test comes from OSFI Guideline B-20 (uninsured mortgages at federally regulated lenders) and the federal mortgage-insurance rules (insured mortgages). It forces lenders to qualify you at the greater of your contract rate +2% or 5.25%, even though your actual payments are based on the lower contract rate. The point is resilience: if rates climb at renewal, you should still be able to carry the loan.

The borrowing-power gap above appears because a higher qualifying rate means more of every hypothetical payment is treated as interest, so the same dollar budget supports a smaller principal. That is the mechanism that shrinks your maximum mortgage by roughly 18% on this file — not your real payment, which never changes.

You can sometimes close the gap: provincially regulated credit unions are not bound by B-20 and set their own qualifying rules, and a larger down payment or lower other debt frees up room. See how it flows through to a full purchase budget on our affordability calculator, or the income behind it on our income-required calculator.

How to use this calculator
  1. Enter your mortgage detailsInput your mortgage amount, the contract rate your lender has offered, and your amortization period. The calculator instantly computes your real payment and your stress-test qualifying payment side by side.
  2. See your qualifying paymentThe stress-test rate is the greater of your contract rate +2% or 5.25% — whichever is higher. That qualifying payment, not your actual one, is what federally regulated lenders use to size your maximum mortgage. The borrowing-power gap shows you exactly how much it costs you.
  3. Talk to a broker to close the gapIf the stress test is cutting your borrowing power, there are levers: a larger down payment, a co-applicant, or a provincially regulated credit union that sets its own qualifying rules. We review every file free — call us.
How this is calculated
The stress test applies to insured AND uninsured mortgages at federally regulated lenders. Some provincially regulated credit unions and private lenders set their own qualifying rules; we shop both paths. The qualifying-rate rule is set by OSFI Guideline B-20.
FAQ

Common questions

Don’t see yours? Ask Maya.

What is the Canadian mortgage stress test?
Federally regulated lenders must qualify you at the greater of contract rate + 2% or 5.25%: OSFI’s minimum qualifying rate for uninsured mortgages (OSFI) and the federal mortgage-insurance rules for insured ones use the same formula. So a 4.39% offered rate qualifies at 6.39%. The qualifying rate doesn't change your payment — it determines how much mortgage you can carry.
Who is exempt from the stress test?
Provincially regulated credit unions aren’t bound by OSFI’s rule and set their own qualifying policies, which in some cases differ from the federal stress test; insured mortgages still follow the federal insurance rules. And since November 21, 2024, a straight switch to a new lender at renewal (same balance, same amortization) skips the stress test at federally regulated lenders too. We route you to those lenders when your file is at the edge of affordability.
Does the stress test apply at renewal?
If you stay with your current lender at offered renewal: generally no re-qualification, even if your financial situation has worsened. If you switch lenders on a straight transfer (same balance, same amortization): no stress test since November 21, 2024, though the new lender still reviews your file. Add money or extend the amortization and you're qualified under B-20.
What's GDS and TDS?
GDS (Gross Debt Service ratio) = housing costs ÷ gross income, max 39% on insured mortgages. TDS (Total Debt Service) = housing + all other debts ÷ gross income, max 44% on insured mortgages; uninsured lenders set similar limits of their own. Both are computed using the qualifying rate, not the contract rate. Whichever ratio hits its limit first sets your maximum.
Can I improve my stress-tested affordability?
Three levers: (1) increase qualifying income via add-backs, dividend gross-ups, or rental offset; (2) reduce other monthly debt (pay down credit cards, refinance a car loan); (3) increase down payment to lower the mortgage size. The right play depends on your file. Run the numbers on our affordability calculator.
How much does the stress test reduce how much I can borrow?
For the same monthly payment, qualifying at the stress rate instead of your contract rate shrinks your maximum mortgage by roughly 16-18% at typical contract rates on a 25-year amortization (a +2% test). The borrowing-power comparison above shows your file. It doesn't change your real payment, only the principal a lender will let you carry.
Is the stress test rate the same as my mortgage rate?
No. Your contract rate sets your actual payment; the qualifying (stress-test) rate — contract +2% or 5.25%, whichever is higher — is used only to size how much you can borrow. See the payment your contract rate produces on our mortgage payment calculator.
How much does the stress test reduce my borrowing power?
At typical contract rates on a 25-year amortization, a +2% qualifying buffer shrinks your maximum mortgage by roughly 16–18% for the exact same monthly payment budget. The borrowing-power gap in the calculator above shows the precise figure for your numbers.
Does the stress test change my actual mortgage payment?
No. Your contract rate sets your real payment; the qualifying rate only determines how much principal a lender will approve. Once your mortgage funds, you pay at your contract rate every month — the stress-test rate never appears on your statement.
Words to know
Stress testQualifying rateOSFI B-20GDSTDSA vs. B lender
Related calculators & guides
AffordabilityIncome requiredPaymentRefinance
Related guides
The Stress Test Survival Guide: How to Pass and Qualify5 Numbers Every Canadian Should Know Before Getting a Mortgage (2026)
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