Stress Test Calculator
Free Canadian stress test calculator for 2026 — compare contract rate vs qualifying rate (contract +2% or 5.25%), GDS/TDS ratios, and max affordable price. OSFI B-20 compliant.
Heating defaults $120. TDS adds other debts. GDS = (mortgage + tax + heat + 50% condo) ÷ gross monthly income.
Payment at contract rate
$2,512
Payment at qualifying rate
$3,147
GDS at qualifying
37.2% ≤39% ✓
TDS at qualifying
41.6% ≤44% ✓
What you actually qualify for
Max mortgage at qualifying
$412,000
Max purchase price
$452,000
What do these affordability numbers mean for you?
Calculators show the range — a free call confirms stress-test borrowing power and next steps to pre-approval.
1-226-783-1640How the Stress Test Is Calculated (OSFI B-20)
Your qualifying rate is the higher of your contract rate plus 2 percentage points, or 5.25%. On a $560,000 mortgage at 4.69% over 30 years, your actual payment is about $2,512/mo — but you must prove you could afford $3,147/mo at 6.69%. Lenders then check two ratios: GDS (housing costs ÷ gross monthly income) must be ≤39%, and TDS (housing + all debts ÷ income) must be ≤44%, both measured at the qualifying rate. If either fails, you do not qualify for that price — even though your real payment is lower.
Why Your Borrowing Power Drops ~20%
The 2% buffer simulates rate shock. Every $100/mo in non-mortgage debt (car loan, credit cards, student loan) cuts your max mortgage by roughly $15,000–$20,000 under stress test math. Increasing your down payment helps more than you think: on a $600K home, moving from 6.7% ($40K) to 10% ($60K) down raises your max price because the mortgage — and its qualifying payment — both shrink. This calculator shows both payments side by side so you can see exactly how much headroom the stress test removes.
Learn more
- Deep dive: mortgage stress test guide with OSFI rules and 3 worked examples.
- Understand GDS/TDS ratios lenders use during underwriting.
- Model any income with the affordability calculator for household-specific limits.