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Mortgage Qualification, GDS/TDS & Stress Test Calculator

Found a home? Enter its price to see whether you'd likely qualify at the stress-test rate, your GDS and TDS at that price, and what it would take if you're short.

Your Qualification Inputs

$

The asking price of the home you want to check.

$
$
$
%
yr

Max 25 years under 20% down; 30 for first-time buyers, new builds or 20%+ down.

$

Leave at 0 and we estimate it at 0.75% of the home price (typical for London-area homes). Enter your own figure if you know it.

$
$

At $650,000

Possible, but a stretch

GDS at This Price

37.5%

Upper guideline 39%

TDS at This Price

42.9%

Upper guideline 44%

Estimated Maximum Price

$667,000

Your Scenario

Home price checked
$650,000
Buyer type
Repeat buyer, resale home
Household income (annual)
$145,000
Down payment available
$85,000
Other monthly debt payments
$650
Interest rate
4.79%
Amortization
25 years
Default insurance premium (added to mortgage)
$17,515 (3.10%)
Ontario PST on premium (cash at closing)
$1,401
Property tax (annual)
$4,875 (estimated at 0.75% of price)
Heating (monthly)
$120

Can You Buy a $650,000 Home?

Estimate

Possible, but a stretch

Within the 39/44 upper guidelines

Mortgage Amount

$582,515

Estimated Payment

$3,319/mo

At 4.79%

Stress-Test Payment

$4,005/mo

At 6.79%

GDS at This Price

37.5%

Near guideline

TDS at This Price

42.9%

Near guideline

Estimates only. These figures are not an approval, a commitment to lend or a guarantee of qualification.

What It Would Take

At $650,000 you're inside the upper guidelines but above the comfortable range, so the choice of lender matters. Strong credit and stable income help files like this.

Your Estimated Price Range

EstimatePurchase PriceMortgageEst. PaymentGDSTDS
Conservative (35/42)$610,000$541,275$3,084/mo34.9%40.3%
Upper guideline (39/44)$667,000$600,042$3,418/mo38.6%44.0%

Illustrative scenarios based on calculator assumptions and commonly used debt-service ranges.

Understanding Your Debt-Service Ratios

GDS — 37.5%

Near guideline (guideline up to 39%)

TDS — 42.9%

Near guideline (guideline up to 44%)

Gross Debt Service (GDS) compares certain housing-related costs with gross qualifying income. Total Debt Service (TDS) considers housing costs together with other debt obligations.

What this means

Your estimated ratios sit close to commonly used qualification guidelines. Small changes to the mortgage amount, other monthly obligations or the property's carrying costs could affect the result. Actual qualification depends on the lender, mortgage type, credit profile, income verification and other factors.

Mortgage Stress Test Snapshot

Contract Interest Rate

4.79%

Qualifying Rate

6.79%

Estimated Actual Payment

$3,319/mo

Estimated Qualifying Payment

$4,005/mo

Qualifying-rate assumption used: the greater of 5.25% or your contract rate plus 2%. As of: 2026-08-01.

Why this matters

Canadian qualification rules generally require your mortgage application to be assessed at a qualifying rate that is higher than the rate you would actually pay. The qualifying payment shown above is the payment used in that assessment, not the payment you would make.

Testing your file at the higher rate is a way of checking whether the mortgage would still be manageable if rates were higher at renewal. Actual requirements vary by lender, mortgage type and whether the mortgage is insured.

What This Means for You

Lenders qualify you at 6.79%, not your contract rate. Based on the information entered, your estimated qualification falls between $541,275 and $600,042 of mortgage financing.

Your down payment is below 20% of the purchase price, so default mortgage insurance would generally apply. The premium has been added to the mortgage amount shown; Ontario's 8% sales tax on the premium ($1,401) can't be added to the mortgage and is paid in cash at closing. With less than 20% down, the maximum amortization is 25 years unless you're a first-time buyer or buying a newly built home.

Actual qualification depends on the lender, mortgage type, credit profile, income verification, property details and other factors. A licensed mortgage professional can review the complete picture with you.

Your Pathway to Homeownership Starts With Understanding Your Numbers

Your calculator results are estimates. Nandan Bajani can help you review your situation and understand your mortgage options.

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Related Resources

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Nandan Bajani works with London, St. Thomas, Ingersoll, Woodstock and Ontario-wide clients to turn calculator estimates into real lender options.