Dominion Lending CentresPart of the DLCG, Canada's #1 mortgage originator · $84.5B in 2025.
Stress Test + GDS/TDS

Mortgage Affordability Calculator

How much mortgage you actually qualify for under the OSFI B-20 stress test — using real Canadian lender math (GDS 39%, TDS 44%, semi-annual compounding).

Income & debts
Monthly liabilities

How lenders count these: car loan = actual payment; credit cards + unsecured personal LOC = 3% of balance each; student loan = 1–1.5% of balance even on a $0 plan.

Mortgage terms
Amortization
Term
Rate type
Housing carrying costs (monthly)

Heat: CMHC standard $100/mo. Condo: only 50% counts toward your housing ratio.

Max purchase price
$738,567
$638,567 mortgage + $100,000 down · limited by down payment
Total monthly debt (stress-tested)$4,550

Qualified at 6.50% (OSFI B-20 stress test).

Two ways to buy

Same income, same down payment — two strategies. Insured pricing assumed ~0.25% below conventional.

Conventional
20% down (uninsured)
$500,000
Down: $100,000 (20.0%)
Mortgage: $400,000
Rate assumed: 4.75%
Monthly payment
$2,075/mo
Principal & interest at 4.75% over 30-yr amort
Saves $27,588 in CMHC premium
− Extra interest @ +0.25% over 5-yr term: $4,750
Est. net savings: $22,838

Limited by 20% down rule — extra income capacity is unused.

Insured
Less than 20% down (CMHC-insured)
$738,567
Down: $48,857 (6.6%)
Mortgage: $689,710
Rate assumed: 4.50%
Monthly payment
$3,617/mo
Principal & interest at 4.50% over 30-yr amort
Cash left over: $51,143
+ CMHC premium: $27,588 (financed)
Total loan w/ premium: $717,298

Limited by income — you could put even less down at this price.

What this calculator does that most don't
  • Models liabilities the way lenders actually do: credit cards at 3% of balance, student loans at 1–1.5% of balance even on $0 payment plans
  • A multi-property builder that applies 100% rental add-back to income and full carrying costs to TDS — portfolio buyers get real numbers
  • Compares insured vs conventional side by side, netting the CMHC premium saved against the extra interest of the higher conventional rate
  • Discloses the exception ratios brokers actually place files at: A-lenders to 50/50, alternative lenders to 60/60 — numbers no bank calculator will print
Want a real plan, not just an estimate?
Send Ramin exactly what you just calculated — your scenario rides along automatically, so the first conversation starts at your numbers, not at zero.
or use the full contact form

Contract vs stress-test payment

Lenders qualify you on the taller bar — even though you actually pay the shorter one. That's the OSFI B-20 stress test in one picture.

Free personalized quote

Get your real mortgage approval amount

Every file is different — rental addbacks, lender exceptions, and alternative-lender stretch policies vary case by case. We'll run your exact scenario and tell you precisely what you qualify for.

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Exceptions — you may qualify for more▾
  • • Conventional (A-lender) — strong files: as an exception, may be considered up to 50% / 50% GDS / TDS.
  • • Alt-lender (minimum 20% down): up to 60% / 60%, and even higher at ≤65% LTV.
  • • Insured deals (< 20% down): hard capped at 39% / 44% — no exceptions.

This calculator shows the standard 39/44 case. Exceptions depend on file strength and lender — get in touch to find out your true qualification.

How qualifying works: the stress test rate = max(contract rate + 2%, 5.25%). Your lender qualifies you at that higher rate but you pay at the lower contract rate — that gap is your built-in cushion against future rate hikes.

Also see: CMHC insurance → · Prepayment / payoff → · Land transfer tax →